Merge pull request #1779 from dmcgowan/letsencrypt-support

Let's Encrypt support

Godeps/Godeps.json

@@ -270,6 +270,10 @@
 			"ImportPath": "golang.org/x/crypto/blowfish",
 			"Rev": "c10c31b5e94b6f7a0283272dc2bb27163dcea24b"
 		},
+		{
+			"ImportPath": "golang.org/x/crypto/ocsp",
+			"Rev": "c10c31b5e94b6f7a0283272dc2bb27163dcea24b"
+		},
 		{
 			"ImportPath": "golang.org/x/net/context",
 			"Rev": "4876518f9e71663000c348837735820161a42df7"
@@ -314,6 +318,10 @@
 			"ImportPath": "golang.org/x/oauth2/jwt",
 			"Rev": "045497edb6234273d67dbc25da3f2ddbc4c4cacf"
 		},
+		{
+			"ImportPath": "golang.org/x/time/rate",
+			"Rev": "a4bde12657593d5e90d0533a3e4fd95e635124cb"
+		},
 		{
 			"ImportPath": "google.golang.org/api/gensupport",
 			"Rev": "9bf6e6e569ff057f75d9604a46c52928f17d2b54"
@@ -425,6 +433,10 @@
 		{
 			"ImportPath": "gopkg.in/yaml.v2",
 			"Rev": "bef53efd0c76e49e6de55ead051f886bea7e9420"
+		},
+		{
+			"ImportPath": "rsc.io/letsencrypt",
+			"Rev": "a019c9e6fce0c7132679dea13bd8df7c86ffe26c"
 		}
 	]
 }

configuration/configuration.go

@@ -95,6 +95,19 @@ type Configuration struct {
 			// Specifies the CA certs for client authentication
 			// A file may contain multiple CA certificates encoded as PEM
 			ClientCAs []string `yaml:"clientcas,omitempty"`
+
+			// LetsEncrypt is used to configuration setting up TLS through
+			// Let's Encrypt instead of manually specifying certificate and
+			// key. If a TLS certificate is specified, the Let's Encrypt
+			// section will not be used.
+			LetsEncrypt struct {
+				// CacheFile specifies cache file to use for lets encrypt
+				// certificates and keys.
+				CacheFile string `yaml:"cachefile,omitempty"`
+
+				// Email is the email to use during Let's Encrypt registration
+				Email string `yaml:"email,omitempty"`
+			} `yaml:"letsencrypt,omitempty"`
 		} `yaml:"tls,omitempty"`
 
 		// Headers is a set of headers to include in HTTP responses. A common

configuration/configuration_test.go

@@ -73,6 +73,10 @@ var configStruct = Configuration{
 			Certificate string   `yaml:"certificate,omitempty"`
 			Key         string   `yaml:"key,omitempty"`
 			ClientCAs   []string `yaml:"clientcas,omitempty"`
+			LetsEncrypt struct {
+				CacheFile string `yaml:"cachefile,omitempty"`
+				Email     string `yaml:"email,omitempty"`
+			} `yaml:"letsencrypt,omitempty"`
 		} `yaml:"tls,omitempty"`
 		Headers http.Header `yaml:"headers,omitempty"`
 		Debug   struct {
@@ -83,6 +87,10 @@ var configStruct = Configuration{
 			Certificate string   `yaml:"certificate,omitempty"`
 			Key         string   `yaml:"key,omitempty"`
 			ClientCAs   []string `yaml:"clientcas,omitempty"`
+			LetsEncrypt struct {
+				CacheFile string `yaml:"cachefile,omitempty"`
+				Email     string `yaml:"email,omitempty"`
+			} `yaml:"letsencrypt,omitempty"`
 		}{
 			ClientCAs: []string{"/path/to/ca.pem"},
 		},

docs/configuration.md

@@ -191,6 +191,9 @@ information about each option that appears later in this page.
         clientcas:
           - /path/to/ca.pem
           - /path/to/another/ca.pem
+        letsencrypt:
+          cachefile: /path/to/cache-file
+          email: emailused@letsencrypt.com
       debug:
         addr: localhost:5001
       headers:
@@ -892,6 +895,9 @@ configuration may contain both.
         clientcas:
           - /path/to/ca.pem
           - /path/to/another/ca.pem
+        letsencrypt:
+          cachefile: /path/to/cache-file
+          email: emailused@letsencrypt.com
       debug:
         addr: localhost:5001
       headers:
@@ -1037,6 +1043,40 @@ and proxy connections to the registry server.
   </tr>
 </table>
 
+### letsencrypt
+
+The `letsencrypt` struct within `tls` is **optional**. Use this to configure TLS
+certificates provided by [Let's Encrypt](https://letsencrypt.org/how-it-works/).
+
+<table>
+  <tr>
+    <th>Parameter</th>
+    <th>Required</th>
+    <th>Description</th>
+  </tr>
+  <tr>
+    <td>
+      <code>cachefile</code>
+    </td>
+    <td>
+      yes
+    </td>
+    <td>
+       Absolute path to a file for the Let's Encrypt agent to cache data
+    </td>
+  </tr>
+    <tr>
+    <td>
+      <code>email</code>
+    </td>
+    <td>
+      yes
+    </td>
+    <td>
+      Email used to register with Let's Encrypt.
+    </td>
+  </tr>
+</table>
 
 ### debug
 

docs/deploying.md

@@ -88,6 +88,11 @@ A certificate issuer may supply you with an *intermediate* certificate. In this
 
     cat domain.crt intermediate-certificates.pem > certs/domain.crt
 
+### Let's Encrypt
+
+The registry supports using Let's Encrypt to automatically obtain a browser-trusted certificate.  For more 
+information on Let's Encrypt, see [https://letsencrypt.org/how-it-works/](https://letsencrypt.org/how-it-works/) and the relevant section of the [registry configuration](configuration.md#letsencrypt).
+
 ### Alternatives
 
 While rarely advisable, you may want to use self-signed certificates instead, or use your registry in an insecure fashion. You will find instructions [here](insecure.md).

registry/registry.go

@@ -9,6 +9,8 @@ import (
 	"os"
 	"time"
 
+	"rsc.io/letsencrypt"
+
 	log "github.com/Sirupsen/logrus"
 	"github.com/Sirupsen/logrus/formatters/logstash"
 	"github.com/bugsnag/bugsnag-go"
@@ -111,11 +113,10 @@ func (registry *Registry) ListenAndServe() error {
 		return err
 	}
 
-	if config.HTTP.TLS.Certificate != "" {
+	if config.HTTP.TLS.Certificate != "" || config.HTTP.TLS.LetsEncrypt.CacheFile != "" {
 		tlsConf := &tls.Config{
 			ClientAuth:               tls.NoClientCert,
 			NextProtos:               []string{"http/1.1"},
-			Certificates:             make([]tls.Certificate, 1),
 			MinVersion:               tls.VersionTLS10,
 			PreferServerCipherSuites: true,
 			CipherSuites: []uint16{
@@ -130,10 +131,27 @@ func (registry *Registry) ListenAndServe() error {
 			},
 		}
 
+		if config.HTTP.TLS.LetsEncrypt.CacheFile != "" {
+			if config.HTTP.TLS.Certificate != "" {
+				return fmt.Errorf("cannot specify both certificate and Let's Encrypt")
+			}
+			var m letsencrypt.Manager
+			if err := m.CacheFile(config.HTTP.TLS.LetsEncrypt.CacheFile); err != nil {
+				return err
+			}
+			if !m.Registered() {
+				if err := m.Register(config.HTTP.TLS.LetsEncrypt.Email, nil); err != nil {
+					return err
+				}
+			}
+			tlsConf.GetCertificate = m.GetCertificate
+		} else {
+			tlsConf.Certificates = make([]tls.Certificate, 1)
 			tlsConf.Certificates[0], err = tls.LoadX509KeyPair(config.HTTP.TLS.Certificate, config.HTTP.TLS.Key)
 			if err != nil {
 				return err
 			}
+		}
 
 		if len(config.HTTP.TLS.ClientCAs) != 0 {
 			pool := x509.NewCertPool()

vendor/golang.org/x/crypto/ocsp/ocsp.go

@@ -0,0 +1,592 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package ocsp parses OCSP responses as specified in RFC 2560. OCSP responses
+// are signed messages attesting to the validity of a certificate for a small
+// period of time. This is used to manage revocation for X.509 certificates.
+package ocsp
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/asn1"
+	"errors"
+	"math/big"
+	"time"
+)
+
+var idPKIXOCSPBasic = asn1.ObjectIdentifier([]int{1, 3, 6, 1, 5, 5, 7, 48, 1, 1})
+
+// These are internal structures that reflect the ASN.1 structure of an OCSP
+// response. See RFC 2560, section 4.2.
+
+const (
+	ocspSuccess       = 0
+	ocspMalformed     = 1
+	ocspInternalError = 2
+	ocspTryLater      = 3
+	ocspSigRequired   = 4
+	ocspUnauthorized  = 5
+)
+
+type certID struct {
+	HashAlgorithm pkix.AlgorithmIdentifier
+	NameHash      []byte
+	IssuerKeyHash []byte
+	SerialNumber  *big.Int
+}
+
+// https://tools.ietf.org/html/rfc2560#section-4.1.1
+type ocspRequest struct {
+	TBSRequest tbsRequest
+}
+
+type tbsRequest struct {
+	Version       int              `asn1:"explicit,tag:0,default:0,optional"`
+	RequestorName pkix.RDNSequence `asn1:"explicit,tag:1,optional"`
+	RequestList   []request
+}
+
+type request struct {
+	Cert certID
+}
+
+type responseASN1 struct {
+	Status   asn1.Enumerated
+	Response responseBytes `asn1:"explicit,tag:0"`
+}
+
+type responseBytes struct {
+	ResponseType asn1.ObjectIdentifier
+	Response     []byte
+}
+
+type basicResponse struct {
+	TBSResponseData    responseData
+	SignatureAlgorithm pkix.AlgorithmIdentifier
+	Signature          asn1.BitString
+	Certificates       []asn1.RawValue `asn1:"explicit,tag:0,optional"`
+}
+
+type responseData struct {
+	Raw              asn1.RawContent
+	Version          int           `asn1:"optional,default:1,explicit,tag:0"`
+	RawResponderName asn1.RawValue `asn1:"optional,explicit,tag:1"`
+	KeyHash          []byte        `asn1:"optional,explicit,tag:2"`
+	ProducedAt       time.Time     `asn1:"generalized"`
+	Responses        []singleResponse
+}
+
+type singleResponse struct {
+	CertID     certID
+	Good       asn1.Flag   `asn1:"tag:0,optional"`
+	Revoked    revokedInfo `asn1:"explicit,tag:1,optional"`
+	Unknown    asn1.Flag   `asn1:"tag:2,optional"`
+	ThisUpdate time.Time   `asn1:"generalized"`
+	NextUpdate time.Time   `asn1:"generalized,explicit,tag:0,optional"`
+}
+
+type revokedInfo struct {
+	RevocationTime time.Time `asn1:"generalized"`
+	Reason         int       `asn1:"explicit,tag:0,optional"`
+}
+
+var (
+	oidSignatureMD2WithRSA      = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 2}
+	oidSignatureMD5WithRSA      = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 4}
+	oidSignatureSHA1WithRSA     = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 5}
+	oidSignatureSHA256WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 11}
+	oidSignatureSHA384WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 12}
+	oidSignatureSHA512WithRSA   = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 13}
+	oidSignatureDSAWithSHA1     = asn1.ObjectIdentifier{1, 2, 840, 10040, 4, 3}
+	oidSignatureDSAWithSHA256   = asn1.ObjectIdentifier{2, 16, 840, 1, 101, 4, 3, 2}
+	oidSignatureECDSAWithSHA1   = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 1}
+	oidSignatureECDSAWithSHA256 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 2}
+	oidSignatureECDSAWithSHA384 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 3}
+	oidSignatureECDSAWithSHA512 = asn1.ObjectIdentifier{1, 2, 840, 10045, 4, 3, 4}
+)
+
+var hashOIDs = map[crypto.Hash]asn1.ObjectIdentifier{
+	crypto.SHA1:   asn1.ObjectIdentifier([]int{1, 3, 14, 3, 2, 26}),
+	crypto.SHA256: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 1}),
+	crypto.SHA384: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 2}),
+	crypto.SHA512: asn1.ObjectIdentifier([]int{2, 16, 840, 1, 101, 3, 4, 2, 3}),
+}
+
+// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below
+var signatureAlgorithmDetails = []struct {
+	algo       x509.SignatureAlgorithm
+	oid        asn1.ObjectIdentifier
+	pubKeyAlgo x509.PublicKeyAlgorithm
+	hash       crypto.Hash
+}{
+	{x509.MD2WithRSA, oidSignatureMD2WithRSA, x509.RSA, crypto.Hash(0) /* no value for MD2 */},
+	{x509.MD5WithRSA, oidSignatureMD5WithRSA, x509.RSA, crypto.MD5},
+	{x509.SHA1WithRSA, oidSignatureSHA1WithRSA, x509.RSA, crypto.SHA1},
+	{x509.SHA256WithRSA, oidSignatureSHA256WithRSA, x509.RSA, crypto.SHA256},
+	{x509.SHA384WithRSA, oidSignatureSHA384WithRSA, x509.RSA, crypto.SHA384},
+	{x509.SHA512WithRSA, oidSignatureSHA512WithRSA, x509.RSA, crypto.SHA512},
+	{x509.DSAWithSHA1, oidSignatureDSAWithSHA1, x509.DSA, crypto.SHA1},
+	{x509.DSAWithSHA256, oidSignatureDSAWithSHA256, x509.DSA, crypto.SHA256},
+	{x509.ECDSAWithSHA1, oidSignatureECDSAWithSHA1, x509.ECDSA, crypto.SHA1},
+	{x509.ECDSAWithSHA256, oidSignatureECDSAWithSHA256, x509.ECDSA, crypto.SHA256},
+	{x509.ECDSAWithSHA384, oidSignatureECDSAWithSHA384, x509.ECDSA, crypto.SHA384},
+	{x509.ECDSAWithSHA512, oidSignatureECDSAWithSHA512, x509.ECDSA, crypto.SHA512},
+}
+
+// TODO(rlb): This is also from crypto/x509, so same comment as AGL's below
+func signingParamsForPublicKey(pub interface{}, requestedSigAlgo x509.SignatureAlgorithm) (hashFunc crypto.Hash, sigAlgo pkix.AlgorithmIdentifier, err error) {
+	var pubType x509.PublicKeyAlgorithm
+
+	switch pub := pub.(type) {
+	case *rsa.PublicKey:
+		pubType = x509.RSA
+		hashFunc = crypto.SHA256
+		sigAlgo.Algorithm = oidSignatureSHA256WithRSA
+		sigAlgo.Parameters = asn1.RawValue{
+			Tag: 5,
+		}
+
+	case *ecdsa.PublicKey:
+		pubType = x509.ECDSA
+
+		switch pub.Curve {
+		case elliptic.P224(), elliptic.P256():
+			hashFunc = crypto.SHA256
+			sigAlgo.Algorithm = oidSignatureECDSAWithSHA256
+		case elliptic.P384():
+			hashFunc = crypto.SHA384
+			sigAlgo.Algorithm = oidSignatureECDSAWithSHA384
+		case elliptic.P521():
+			hashFunc = crypto.SHA512
+			sigAlgo.Algorithm = oidSignatureECDSAWithSHA512
+		default:
+			err = errors.New("x509: unknown elliptic curve")
+		}
+
+	default:
+		err = errors.New("x509: only RSA and ECDSA keys supported")
+	}
+
+	if err != nil {
+		return
+	}
+
+	if requestedSigAlgo == 0 {
+		return
+	}
+
+	found := false
+	for _, details := range signatureAlgorithmDetails {
+		if details.algo == requestedSigAlgo {
+			if details.pubKeyAlgo != pubType {
+				err = errors.New("x509: requested SignatureAlgorithm does not match private key type")
+				return
+			}
+			sigAlgo.Algorithm, hashFunc = details.oid, details.hash
+			if hashFunc == 0 {
+				err = errors.New("x509: cannot sign with hash function requested")
+				return
+			}
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		err = errors.New("x509: unknown SignatureAlgorithm")
+	}
+
+	return
+}
+
+// TODO(agl): this is taken from crypto/x509 and so should probably be exported
+// from crypto/x509 or crypto/x509/pkix.
+func getSignatureAlgorithmFromOID(oid asn1.ObjectIdentifier) x509.SignatureAlgorithm {
+	for _, details := range signatureAlgorithmDetails {
+		if oid.Equal(details.oid) {
+			return details.algo
+		}
+	}
+	return x509.UnknownSignatureAlgorithm
+}
+
+// TODO(rlb): This is not taken from crypto/x509, but it's of the same general form.
+func getHashAlgorithmFromOID(target asn1.ObjectIdentifier) crypto.Hash {
+	for hash, oid := range hashOIDs {
+		if oid.Equal(target) {
+			return hash
+		}
+	}
+	return crypto.Hash(0)
+}
+
+// This is the exposed reflection of the internal OCSP structures.
+
+const (
+	// Good means that the certificate is valid.
+	Good = iota
+	// Revoked means that the certificate has been deliberately revoked.
+	Revoked = iota
+	// Unknown means that the OCSP responder doesn't know about the certificate.
+	Unknown = iota
+	// ServerFailed means that the OCSP responder failed to process the request.
+	ServerFailed = iota
+)
+
+// Request represents an OCSP request. See RFC 2560.
+type Request struct {
+	HashAlgorithm  crypto.Hash
+	IssuerNameHash []byte
+	IssuerKeyHash  []byte
+	SerialNumber   *big.Int
+}
+
+// Response represents an OCSP response. See RFC 2560.
+type Response struct {
+	// Status is one of {Good, Revoked, Unknown, ServerFailed}
+	Status                                        int
+	SerialNumber                                  *big.Int
+	ProducedAt, ThisUpdate, NextUpdate, RevokedAt time.Time
+	RevocationReason                              int
+	Certificate                                   *x509.Certificate
+	// TBSResponseData contains the raw bytes of the signed response. If
+	// Certificate is nil then this can be used to verify Signature.
+	TBSResponseData    []byte
+	Signature          []byte
+	SignatureAlgorithm x509.SignatureAlgorithm
+}
+
+// These are pre-serialized error responses for the various non-success codes
+// defined by OCSP. The Unauthorized code in particular can be used by an OCSP
+// responder that supports only pre-signed responses as a response to requests
+// for certificates with unknown status. See RFC 5019.
+var (
+	MalformedRequestErrorResponse = []byte{0x30, 0x03, 0x0A, 0x01, 0x01}
+	InternalErrorErrorResponse    = []byte{0x30, 0x03, 0x0A, 0x01, 0x02}
+	TryLaterErrorResponse         = []byte{0x30, 0x03, 0x0A, 0x01, 0x03}
+	SigRequredErrorResponse       = []byte{0x30, 0x03, 0x0A, 0x01, 0x05}
+	UnauthorizedErrorResponse     = []byte{0x30, 0x03, 0x0A, 0x01, 0x06}
+)
+
+// CheckSignatureFrom checks that the signature in resp is a valid signature
+// from issuer. This should only be used if resp.Certificate is nil. Otherwise,
+// the OCSP response contained an intermediate certificate that created the
+// signature. That signature is checked by ParseResponse and only
+// resp.Certificate remains to be validated.
+func (resp *Response) CheckSignatureFrom(issuer *x509.Certificate) error {
+	return issuer.CheckSignature(resp.SignatureAlgorithm, resp.TBSResponseData, resp.Signature)
+}
+
+// ParseError results from an invalid OCSP response.
+type ParseError string
+
+func (p ParseError) Error() string {
+	return string(p)
+}
+
+// ParseRequest parses an OCSP request in DER form. It only supports
+// requests for a single certificate. Signed requests are not supported.
+// If a request includes a signature, it will result in a ParseError.
+func ParseRequest(bytes []byte) (*Request, error) {
+	var req ocspRequest
+	rest, err := asn1.Unmarshal(bytes, &req)
+	if err != nil {
+		return nil, err
+	}
+	if len(rest) > 0 {
+		return nil, ParseError("trailing data in OCSP request")
+	}
+
+	if len(req.TBSRequest.RequestList) == 0 {
+		return nil, ParseError("OCSP request contains no request body")
+	}
+	innerRequest := req.TBSRequest.RequestList[0]
+
+	hashFunc := getHashAlgorithmFromOID(innerRequest.Cert.HashAlgorithm.Algorithm)
+	if hashFunc == crypto.Hash(0) {
+		return nil, ParseError("OCSP request uses unknown hash function")
+	}
+
+	return &Request{
+		HashAlgorithm:  hashFunc,
+		IssuerNameHash: innerRequest.Cert.NameHash,
+		IssuerKeyHash:  innerRequest.Cert.IssuerKeyHash,
+		SerialNumber:   innerRequest.Cert.SerialNumber,
+	}, nil
+}
+
+// ParseResponse parses an OCSP response in DER form. It only supports
+// responses for a single certificate. If the response contains a certificate
+// then the signature over the response is checked. If issuer is not nil then
+// it will be used to validate the signature or embedded certificate. Invalid
+// signatures or parse failures will result in a ParseError.
+func ParseResponse(bytes []byte, issuer *x509.Certificate) (*Response, error) {
+	var resp responseASN1
+	rest, err := asn1.Unmarshal(bytes, &resp)
+	if err != nil {
+		return nil, err
+	}
+	if len(rest) > 0 {
+		return nil, ParseError("trailing data in OCSP response")
+	}
+
+	ret := new(Response)
+	if resp.Status != ocspSuccess {
+		ret.Status = ServerFailed
+		return ret, nil
+	}
+
+	if !resp.Response.ResponseType.Equal(idPKIXOCSPBasic) {
+		return nil, ParseError("bad OCSP response type")
+	}
+
+	var basicResp basicResponse
+	rest, err = asn1.Unmarshal(resp.Response.Response, &basicResp)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(basicResp.Certificates) > 1 {
+		return nil, ParseError("OCSP response contains bad number of certificates")
+	}
+
+	if len(basicResp.TBSResponseData.Responses) != 1 {
+		return nil, ParseError("OCSP response contains bad number of responses")
+	}
+
+	ret.TBSResponseData = basicResp.TBSResponseData.Raw
+	ret.Signature = basicResp.Signature.RightAlign()
+	ret.SignatureAlgorithm = getSignatureAlgorithmFromOID(basicResp.SignatureAlgorithm.Algorithm)
+
+	if len(basicResp.Certificates) > 0 {
+		ret.Certificate, err = x509.ParseCertificate(basicResp.Certificates[0].FullBytes)
+		if err != nil {
+			return nil, err
+		}
+
+		if err := ret.CheckSignatureFrom(ret.Certificate); err != nil {
+			return nil, ParseError("bad OCSP signature")
+		}
+
+		if issuer != nil {
+			if err := issuer.CheckSignature(ret.Certificate.SignatureAlgorithm, ret.Certificate.RawTBSCertificate, ret.Certificate.Signature); err != nil {
+				return nil, ParseError("bad signature on embedded certificate")
+			}
+		}
+	} else if issuer != nil {
+		if err := ret.CheckSignatureFrom(issuer); err != nil {
+			return nil, ParseError("bad OCSP signature")
+		}
+	}
+
+	r := basicResp.TBSResponseData.Responses[0]
+
+	ret.SerialNumber = r.CertID.SerialNumber
+
+	switch {
+	case bool(r.Good):
+		ret.Status = Good
+	case bool(r.Unknown):
+		ret.Status = Unknown
+	default:
+		ret.Status = Revoked
+		ret.RevokedAt = r.Revoked.RevocationTime
+		ret.RevocationReason = r.Revoked.Reason
+	}
+
+	ret.ProducedAt = basicResp.TBSResponseData.ProducedAt
+	ret.ThisUpdate = r.ThisUpdate
+	ret.NextUpdate = r.NextUpdate
+
+	return ret, nil
+}
+
+// RequestOptions contains options for constructing OCSP requests.
+type RequestOptions struct {
+	// Hash contains the hash function that should be used when
+	// constructing the OCSP request. If zero, SHA-1 will be used.
+	Hash crypto.Hash
+}
+
+func (opts *RequestOptions) hash() crypto.Hash {
+	if opts == nil || opts.Hash == 0 {
+		// SHA-1 is nearly universally used in OCSP.
+		return crypto.SHA1
+	}
+	return opts.Hash
+}
+
+// CreateRequest returns a DER-encoded, OCSP request for the status of cert. If
+// opts is nil then sensible defaults are used.
+func CreateRequest(cert, issuer *x509.Certificate, opts *RequestOptions) ([]byte, error) {
+	hashFunc := opts.hash()
+
+	// OCSP seems to be the only place where these raw hash identifiers are
+	// used. I took the following from
+	// http://msdn.microsoft.com/en-us/library/ff635603.aspx
+	var hashOID asn1.ObjectIdentifier
+	hashOID, ok := hashOIDs[hashFunc]
+	if !ok {
+		return nil, x509.ErrUnsupportedAlgorithm
+	}
+
+	if !hashFunc.Available() {
+		return nil, x509.ErrUnsupportedAlgorithm
+	}
+	h := opts.hash().New()
+
+	var publicKeyInfo struct {
+		Algorithm pkix.AlgorithmIdentifier
+		PublicKey asn1.BitString
+	}
+	if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil {
+		return nil, err
+	}
+
+	h.Write(publicKeyInfo.PublicKey.RightAlign())
+	issuerKeyHash := h.Sum(nil)
+
+	h.Reset()
+	h.Write(issuer.RawSubject)
+	issuerNameHash := h.Sum(nil)
+
+	return asn1.Marshal(ocspRequest{
+		tbsRequest{
+			Version: 0,
+			RequestList: []request{
+				{
+					Cert: certID{
+						pkix.AlgorithmIdentifier{
+							Algorithm:  hashOID,
+							Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
+						},
+						issuerNameHash,
+						issuerKeyHash,
+						cert.SerialNumber,
+					},
+				},
+			},
+		},
+	})
+}
+
+// CreateResponse returns a DER-encoded OCSP response with the specified contents.
+// The fields in the response are populated as follows:
+//
+// The responder cert is used to populate the ResponderName field, and the certificate
+// itself is provided alongside the OCSP response signature.
+//
+// The issuer cert is used to puplate the IssuerNameHash and IssuerKeyHash fields.
+// (SHA-1 is used for the hash function; this is not configurable.)
+//
+// The template is used to populate the SerialNumber, RevocationStatus, RevokedAt,
+// RevocationReason, ThisUpdate, and NextUpdate fields.
+//
+// The ProducedAt date is automatically set to the current date, to the nearest minute.
+func CreateResponse(issuer, responderCert *x509.Certificate, template Response, priv crypto.Signer) ([]byte, error) {
+	var publicKeyInfo struct {
+		Algorithm pkix.AlgorithmIdentifier
+		PublicKey asn1.BitString
+	}
+	if _, err := asn1.Unmarshal(issuer.RawSubjectPublicKeyInfo, &publicKeyInfo); err != nil {
+		return nil, err
+	}
+
+	h := sha1.New()
+	h.Write(publicKeyInfo.PublicKey.RightAlign())
+	issuerKeyHash := h.Sum(nil)
+
+	h.Reset()
+	h.Write(issuer.RawSubject)
+	issuerNameHash := h.Sum(nil)
+
+	innerResponse := singleResponse{
+		CertID: certID{
+			HashAlgorithm: pkix.AlgorithmIdentifier{
+				Algorithm:  hashOIDs[crypto.SHA1],
+				Parameters: asn1.RawValue{Tag: 5 /* ASN.1 NULL */},
+			},
+			NameHash:      issuerNameHash,
+			IssuerKeyHash: issuerKeyHash,
+			SerialNumber:  template.SerialNumber,
+		},
+		ThisUpdate: template.ThisUpdate.UTC(),
+		NextUpdate: template.NextUpdate.UTC(),
+	}
+
+	switch template.Status {
+	case Good:
+		innerResponse.Good = true
+	case Unknown:
+		innerResponse.Unknown = true
+	case Revoked:
+		innerResponse.Revoked = revokedInfo{
+			RevocationTime: template.RevokedAt.UTC(),
+			Reason:         template.RevocationReason,
+		}
+	}
+
+	responderName := asn1.RawValue{
+		Class:      2, // context-specific
+		Tag:        1, // explicit tag
+		IsCompound: true,
+		Bytes:      responderCert.RawSubject,
+	}
+	tbsResponseData := responseData{
+		Version:          0,
+		RawResponderName: responderName,
+		ProducedAt:       time.Now().Truncate(time.Minute).UTC(),
+		Responses:        []singleResponse{innerResponse},
+	}
+
+	tbsResponseDataDER, err := asn1.Marshal(tbsResponseData)
+	if err != nil {
+		return nil, err
+	}
+
+	hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(priv.Public(), template.SignatureAlgorithm)
+	if err != nil {
+		return nil, err
+	}
+
+	responseHash := hashFunc.New()
+	responseHash.Write(tbsResponseDataDER)
+	signature, err := priv.Sign(rand.Reader, responseHash.Sum(nil), hashFunc)
+	if err != nil {
+		return nil, err
+	}
+
+	response := basicResponse{
+		TBSResponseData:    tbsResponseData,
+		SignatureAlgorithm: signatureAlgorithm,
+		Signature: asn1.BitString{
+			Bytes:     signature,
+			BitLength: 8 * len(signature),
+		},
+	}
+	if template.Certificate != nil {
+		response.Certificates = []asn1.RawValue{
+			asn1.RawValue{FullBytes: template.Certificate.Raw},
+		}
+	}
+	responseDER, err := asn1.Marshal(response)
+	if err != nil {
+		return nil, err
+	}
+
+	return asn1.Marshal(responseASN1{
+		Status: ocspSuccess,
+		Response: responseBytes{
+			ResponseType: idPKIXOCSPBasic,
+			Response:     responseDER,
+		},
+	})
+}

vendor/golang.org/x/time/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/golang.org/x/time/PATENTS

@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.

vendor/golang.org/x/time/rate/rate.go

@@ -0,0 +1,368 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package rate provides a rate limiter.
+package rate
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"time"
+
+	"golang.org/x/net/context"
+)
+
+// Limit defines the maximum frequency of some events.
+// Limit is represented as number of events per second.
+// A zero Limit allows no events.
+type Limit float64
+
+// Inf is the infinite rate limit; it allows all events (even if burst is zero).
+const Inf = Limit(math.MaxFloat64)
+
+// Every converts a minimum time interval between events to a Limit.
+func Every(interval time.Duration) Limit {
+	if interval <= 0 {
+		return Inf
+	}
+	return 1 / Limit(interval.Seconds())
+}
+
+// A Limiter controls how frequently events are allowed to happen.
+// It implements a "token bucket" of size b, initially full and refilled
+// at rate r tokens per second.
+// Informally, in any large enough time interval, the Limiter limits the
+// rate to r tokens per second, with a maximum burst size of b events.
+// As a special case, if r == Inf (the infinite rate), b is ignored.
+// See https://en.wikipedia.org/wiki/Token_bucket for more about token buckets.
+//
+// The zero value is a valid Limiter, but it will reject all events.
+// Use NewLimiter to create non-zero Limiters.
+//
+// Limiter has three main methods, Allow, Reserve, and Wait.
+// Most callers should use Wait.
+//
+// Each of the three methods consumes a single token.
+// They differ in their behavior when no token is available.
+// If no token is available, Allow returns false.
+// If no token is available, Reserve returns a reservation for a future token
+// and the amount of time the caller must wait before using it.
+// If no token is available, Wait blocks until one can be obtained
+// or its associated context.Context is canceled.
+//
+// The methods AllowN, ReserveN, and WaitN consume n tokens.
+type Limiter struct {
+	limit Limit
+	burst int
+
+	mu     sync.Mutex
+	tokens float64
+	// last is the last time the limiter's tokens field was updated
+	last time.Time
+	// lastEvent is the latest time of a rate-limited event (past or future)
+	lastEvent time.Time
+}
+
+// Limit returns the maximum overall event rate.
+func (lim *Limiter) Limit() Limit {
+	lim.mu.Lock()
+	defer lim.mu.Unlock()
+	return lim.limit
+}
+
+// Burst returns the maximum burst size. Burst is the maximum number of tokens
+// that can be consumed in a single call to Allow, Reserve, or Wait, so higher
+// Burst values allow more events to happen at once.
+// A zero Burst allows no events, unless limit == Inf.
+func (lim *Limiter) Burst() int {
+	return lim.burst
+}
+
+// NewLimiter returns a new Limiter that allows events up to rate r and permits
+// bursts of at most b tokens.
+func NewLimiter(r Limit, b int) *Limiter {
+	return &Limiter{
+		limit: r,
+		burst: b,
+	}
+}
+
+// Allow is shorthand for AllowN(time.Now(), 1).
+func (lim *Limiter) Allow() bool {
+	return lim.AllowN(time.Now(), 1)
+}
+
+// AllowN reports whether n events may happen at time now.
+// Use this method if you intend to drop / skip events that exceed the rate limit.
+// Otherwise use Reserve or Wait.
+func (lim *Limiter) AllowN(now time.Time, n int) bool {
+	return lim.reserveN(now, n, 0).ok
+}
+
+// A Reservation holds information about events that are permitted by a Limiter to happen after a delay.
+// A Reservation may be canceled, which may enable the Limiter to permit additional events.
+type Reservation struct {
+	ok        bool
+	lim       *Limiter
+	tokens    int
+	timeToAct time.Time
+	// This is the Limit at reservation time, it can change later.
+	limit Limit
+}
+
+// OK returns whether the limiter can provide the requested number of tokens
+// within the maximum wait time.  If OK is false, Delay returns InfDuration, and
+// Cancel does nothing.
+func (r *Reservation) OK() bool {
+	return r.ok
+}
+
+// Delay is shorthand for DelayFrom(time.Now()).
+func (r *Reservation) Delay() time.Duration {
+	return r.DelayFrom(time.Now())
+}
+
+// InfDuration is the duration returned by Delay when a Reservation is not OK.
+const InfDuration = time.Duration(1<<63 - 1)
+
+// DelayFrom returns the duration for which the reservation holder must wait
+// before taking the reserved action.  Zero duration means act immediately.
+// InfDuration means the limiter cannot grant the tokens requested in this
+// Reservation within the maximum wait time.
+func (r *Reservation) DelayFrom(now time.Time) time.Duration {
+	if !r.ok {
+		return InfDuration
+	}
+	delay := r.timeToAct.Sub(now)
+	if delay < 0 {
+		return 0
+	}
+	return delay
+}
+
+// Cancel is shorthand for CancelAt(time.Now()).
+func (r *Reservation) Cancel() {
+	r.CancelAt(time.Now())
+	return
+}
+
+// CancelAt indicates that the reservation holder will not perform the reserved action
+// and reverses the effects of this Reservation on the rate limit as much as possible,
+// considering that other reservations may have already been made.
+func (r *Reservation) CancelAt(now time.Time) {
+	if !r.ok {
+		return
+	}
+
+	r.lim.mu.Lock()
+	defer r.lim.mu.Unlock()
+
+	if r.lim.limit == Inf || r.tokens == 0 || r.timeToAct.Before(now) {
+		return
+	}
+
+	// calculate tokens to restore
+	// The duration between lim.lastEvent and r.timeToAct tells us how many tokens were reserved
+	// after r was obtained. These tokens should not be restored.
+	restoreTokens := float64(r.tokens) - r.limit.tokensFromDuration(r.lim.lastEvent.Sub(r.timeToAct))
+	if restoreTokens <= 0 {
+		return
+	}
+	// advance time to now
+	now, _, tokens := r.lim.advance(now)
+	// calculate new number of tokens
+	tokens += restoreTokens
+	if burst := float64(r.lim.burst); tokens > burst {
+		tokens = burst
+	}
+	// update state
+	r.lim.last = now
+	r.lim.tokens = tokens
+	if r.timeToAct == r.lim.lastEvent {
+		prevEvent := r.timeToAct.Add(r.limit.durationFromTokens(float64(-r.tokens)))
+		if !prevEvent.Before(now) {
+			r.lim.lastEvent = prevEvent
+		}
+	}
+
+	return
+}
+
+// Reserve is shorthand for ReserveN(time.Now(), 1).
+func (lim *Limiter) Reserve() *Reservation {
+	return lim.ReserveN(time.Now(), 1)
+}
+
+// ReserveN returns a Reservation that indicates how long the caller must wait before n events happen.
+// The Limiter takes this Reservation into account when allowing future events.
+// ReserveN returns false if n exceeds the Limiter's burst size.
+// Usage example:
+//   r, ok := lim.ReserveN(time.Now(), 1)
+//   if !ok {
+//     // Not allowed to act! Did you remember to set lim.burst to be > 0 ?
+//   }
+//   time.Sleep(r.Delay())
+//   Act()
+// Use this method if you wish to wait and slow down in accordance with the rate limit without dropping events.
+// If you need to respect a deadline or cancel the delay, use Wait instead.
+// To drop or skip events exceeding rate limit, use Allow instead.
+func (lim *Limiter) ReserveN(now time.Time, n int) *Reservation {
+	r := lim.reserveN(now, n, InfDuration)
+	return &r
+}
+
+// Wait is shorthand for WaitN(ctx, 1).
+func (lim *Limiter) Wait(ctx context.Context) (err error) {
+	return lim.WaitN(ctx, 1)
+}
+
+// WaitN blocks until lim permits n events to happen.
+// It returns an error if n exceeds the Limiter's burst size, the Context is
+// canceled, or the expected wait time exceeds the Context's Deadline.
+func (lim *Limiter) WaitN(ctx context.Context, n int) (err error) {
+	if n > lim.burst {
+		return fmt.Errorf("rate: Wait(n=%d) exceeds limiter's burst %d", n, lim.burst)
+	}
+	// Check if ctx is already cancelled
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	// Determine wait limit
+	now := time.Now()
+	waitLimit := InfDuration
+	if deadline, ok := ctx.Deadline(); ok {
+		waitLimit = deadline.Sub(now)
+	}
+	// Reserve
+	r := lim.reserveN(now, n, waitLimit)
+	if !r.ok {
+		return fmt.Errorf("rate: Wait(n=%d) would exceed context deadline", n)
+	}
+	// Wait
+	t := time.NewTimer(r.DelayFrom(now))
+	defer t.Stop()
+	select {
+	case <-t.C:
+		// We can proceed.
+		return nil
+	case <-ctx.Done():
+		// Context was canceled before we could proceed.  Cancel the
+		// reservation, which may permit other events to proceed sooner.
+		r.Cancel()
+		return ctx.Err()
+	}
+}
+
+// SetLimit is shorthand for SetLimitAt(time.Now(), newLimit).
+func (lim *Limiter) SetLimit(newLimit Limit) {
+	lim.SetLimitAt(time.Now(), newLimit)
+}
+
+// SetLimitAt sets a new Limit for the limiter. The new Limit, and Burst, may be violated
+// or underutilized by those which reserved (using Reserve or Wait) but did not yet act
+// before SetLimitAt was called.
+func (lim *Limiter) SetLimitAt(now time.Time, newLimit Limit) {
+	lim.mu.Lock()
+	defer lim.mu.Unlock()
+
+	now, _, tokens := lim.advance(now)
+
+	lim.last = now
+	lim.tokens = tokens
+	lim.limit = newLimit
+}
+
+// reserveN is a helper method for AllowN, ReserveN, and WaitN.
+// maxFutureReserve specifies the maximum reservation wait duration allowed.
+// reserveN returns Reservation, not *Reservation, to avoid allocation in AllowN and WaitN.
+func (lim *Limiter) reserveN(now time.Time, n int, maxFutureReserve time.Duration) Reservation {
+	lim.mu.Lock()
+	defer lim.mu.Unlock()
+
+	if lim.limit == Inf {
+		return Reservation{
+			ok:        true,
+			lim:       lim,
+			tokens:    n,
+			timeToAct: now,
+		}
+	}
+
+	now, last, tokens := lim.advance(now)
+
+	// Calculate the remaining number of tokens resulting from the request.
+	tokens -= float64(n)
+
+	// Calculate the wait duration
+	var waitDuration time.Duration
+	if tokens < 0 {
+		waitDuration = lim.limit.durationFromTokens(-tokens)
+	}
+
+	// Decide result
+	ok := n <= lim.burst && waitDuration <= maxFutureReserve
+
+	// Prepare reservation
+	r := Reservation{
+		ok:    ok,
+		lim:   lim,
+		limit: lim.limit,
+	}
+	if ok {
+		r.tokens = n
+		r.timeToAct = now.Add(waitDuration)
+	}
+
+	// Update state
+	if ok {
+		lim.last = now
+		lim.tokens = tokens
+		lim.lastEvent = r.timeToAct
+	} else {
+		lim.last = last
+	}
+
+	return r
+}
+
+// advance calculates and returns an updated state for lim resulting from the passage of time.
+// lim is not changed.
+func (lim *Limiter) advance(now time.Time) (newNow time.Time, newLast time.Time, newTokens float64) {
+	last := lim.last
+	if now.Before(last) {
+		last = now
+	}
+
+	// Avoid making delta overflow below when last is very old.
+	maxElapsed := lim.limit.durationFromTokens(float64(lim.burst) - lim.tokens)
+	elapsed := now.Sub(last)
+	if elapsed > maxElapsed {
+		elapsed = maxElapsed
+	}
+
+	// Calculate the new number of tokens, due to time that passed.
+	delta := lim.limit.tokensFromDuration(elapsed)
+	tokens := lim.tokens + delta
+	if burst := float64(lim.burst); tokens > burst {
+		tokens = burst
+	}
+
+	return now, last, tokens
+}
+
+// durationFromTokens is a unit conversion function from the number of tokens to the duration
+// of time it takes to accumulate them at a rate of limit tokens per second.
+func (limit Limit) durationFromTokens(tokens float64) time.Duration {
+	seconds := tokens / float64(limit)
+	return time.Nanosecond * time.Duration(1e9*seconds)
+}
+
+// tokensFromDuration is a unit conversion function from a time duration to the number of tokens
+// which could be accumulated during that duration at a rate of limit tokens per second.
+func (limit Limit) tokensFromDuration(d time.Duration) float64 {
+	return d.Seconds() * float64(limit)
+}

vendor/rsc.io/letsencrypt/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/rsc.io/letsencrypt/README

@@ -0,0 +1,152 @@
+package letsencrypt // import "rsc.io/letsencrypt"
+
+Package letsencrypt obtains TLS certificates from LetsEncrypt.org.
+
+LetsEncrypt.org is a service that issues free SSL/TLS certificates to
+servers that can prove control over the given domain's DNS records or the
+servers pointed at by those records.
+
+
+Quick Start
+
+A complete HTTP/HTTPS web server using TLS certificates from
+LetsEncrypt.org, redirecting all HTTP access to HTTPS, and maintaining TLS
+certificates in a file letsencrypt.cache across server restarts.
+
+    package main
+
+    import (
+    	"fmt"
+    	"log"
+    	"net/http"
+    	"rsc.io/letsencrypt"
+    )
+
+    func main() {
+    	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+    		fmt.Fprintf(w, "Hello, TLS!\n")
+    	})
+    	var m letsencrypt.Manager
+    	if err := m.CacheFile("letsencrypt.cache"); err != nil {
+    		log.Fatal(err)
+    	}
+    	log.Fatal(m.Serve())
+    }
+
+
+Overview
+
+The fundamental type in this package is the Manager, which manages obtaining
+and refreshing a collection of TLS certificates, typically for use by an
+HTTPS server. The example above shows the most basic use of a Manager. The
+use can be customized by calling additional methods of the Manager.
+
+
+Registration
+
+A Manager m registers anonymously with LetsEncrypt.org, including agreeing
+to the letsencrypt.org terms of service, the first time it needs to obtain a
+certificate. To register with a particular email address and with the option
+of a prompt for agreement with the terms of service, call m.Register.
+
+
+GetCertificate
+
+The Manager's GetCertificate method returns certificates from the Manager's
+cache, filling the cache by requesting certificates from LetsEncrypt.org. In
+this way, a server with a tls.Config.GetCertificate set to m.GetCertificate
+will demand load a certificate for any host name it serves. To force loading
+of certificates ahead of time, install m.GetCertificate as before but then
+call m.Cert for each host name.
+
+A Manager can only obtain a certificate for a given host name if it can
+prove control of that host name to LetsEncrypt.org. By default it proves
+control by answering an HTTPS-based challenge: when the LetsEncrypt.org
+servers connect to the named host on port 443 (HTTPS), the TLS SNI handshake
+must use m.GetCertificate to obtain a per-host certificate. The most common
+way to satisfy this requirement is for the host name to resolve to the IP
+address of a (single) computer running m.ServeHTTPS, or at least running a
+Go TLS server with tls.Config.GetCertificate set to m.GetCertificate.
+However, other configurations are possible. For example, a group of machines
+could use an implementation of tls.Config.GetCertificate that cached
+certificates but handled cache misses by making RPCs to a Manager m on an
+elected leader machine.
+
+In typical usage, then, the setting of tls.Config.GetCertificate to
+m.GetCertificate serves two purposes: it provides certificates to the TLS
+server for ordinary serving, and it also answers challenges to prove
+ownership of the domains in order to obtain those certificates.
+
+To force the loading of a certificate for a given host into the Manager's
+cache, use m.Cert.
+
+
+Persistent Storage
+
+If a server always starts with a zero Manager m, the server effectively
+fetches a new certificate for each of its host name from LetsEncrypt.org on
+each restart. This is unfortunate both because the server cannot start if
+LetsEncrypt.org is unavailable and because LetsEncrypt.org limits how often
+it will issue a certificate for a given host name (at time of writing, the
+limit is 5 per week for a given host name). To save server state proactively
+to a cache file and to reload the server state from that same file when
+creating a new manager, call m.CacheFile with the name of the file to use.
+
+For alternate storage uses, m.Marshal returns the current state of the
+Manager as an opaque string, m.Unmarshal sets the state of the Manager using
+a string previously returned by m.Marshal (usually a different m), and
+m.Watch returns a channel that receives notifications about state changes.
+
+
+Limits
+
+To avoid hitting basic rate limits on LetsEncrypt.org, a given Manager
+limits all its interactions to at most one request every minute, with an
+initial allowed burst of 20 requests.
+
+By default, if GetCertificate is asked for a certificate it does not have,
+it will in turn ask LetsEncrypt.org for that certificate. This opens a
+potential attack where attackers connect to a server by IP address and
+pretend to be asking for an incorrect host name. Then GetCertificate will
+attempt to obtain a certificate for that host, incorrectly, eventually
+hitting LetsEncrypt.org's rate limit for certificate requests and making it
+impossible to obtain actual certificates. Because servers hold certificates
+for months at a time, however, an attack would need to be sustained over a
+time period of at least a month in order to cause real problems.
+
+To mitigate this kind of attack, a given Manager limits itself to an average
+of one certificate request for a new host every three hours, with an initial
+allowed burst of up to 20 requests. Long-running servers will therefore stay
+within the LetsEncrypt.org limit of 300 failed requests per month.
+Certificate refreshes are not subject to this limit.
+
+To eliminate the attack entirely, call m.SetHosts to enumerate the exact set
+of hosts that are allowed in certificate requests.
+
+
+Web Servers
+
+The basic requirement for use of a Manager is that there be an HTTPS server
+running on port 443 and calling m.GetCertificate to obtain TLS certificates.
+Using standard primitives, the way to do this is:
+
+    srv := &http.Server{
+    	Addr: ":https",
+    	TLSConfig: &tls.Config{
+    		GetCertificate: m.GetCertificate,
+    	},
+    }
+    srv.ListenAndServeTLS("", "")
+
+However, this pattern of serving HTTPS with demand-loaded TLS certificates
+comes up enough to wrap into a single method m.ServeHTTPS.
+
+Similarly, many HTTPS servers prefer to redirect HTTP clients to the HTTPS
+URLs. That functionality is provided by RedirectHTTP.
+
+The combination of serving HTTPS with demand-loaded TLS certificates and
+serving HTTPS redirects to HTTP clients is provided by m.Serve, as used in
+the original example above.
+
+func RedirectHTTP(w http.ResponseWriter, r *http.Request)
+type Manager struct { ... }

vendor/rsc.io/letsencrypt/lets.go

@@ -0,0 +1,753 @@
+// Copyright 2016 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package letsencrypt obtains TLS certificates from LetsEncrypt.org.
+//
+// LetsEncrypt.org is a service that issues free SSL/TLS certificates to servers
+// that can prove control over the given domain's DNS records or
+// the servers pointed at by those records.
+//
+// Quick Start
+//
+// A complete HTTP/HTTPS web server using TLS certificates from LetsEncrypt.org,
+// redirecting all HTTP access to HTTPS, and maintaining TLS certificates in a file
+// letsencrypt.cache across server restarts.
+//
+//	package main
+//
+//	import (
+//		"fmt"
+//		"log"
+//		"net/http"
+//		"rsc.io/letsencrypt"
+//	)
+//
+//	func main() {
+//		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+//			fmt.Fprintf(w, "Hello, TLS!\n")
+//		})
+//		var m letsencrypt.Manager
+//		if err := m.CacheFile("letsencrypt.cache"); err != nil {
+//			log.Fatal(err)
+//		}
+//		log.Fatal(m.Serve())
+//	}
+//
+// Overview
+//
+// The fundamental type in this package is the Manager, which
+// manages obtaining and refreshing a collection of TLS certificates,
+// typically for use by an HTTPS server.
+// The example above shows the most basic use of a Manager.
+// The use can be customized by calling additional methods of the Manager.
+//
+// Registration
+//
+// A Manager m registers anonymously with LetsEncrypt.org, including agreeing to
+// the letsencrypt.org terms of service, the first time it needs to obtain a certificate.
+// To register with a particular email address and with the option of a
+// prompt for agreement with the terms of service, call m.Register.
+//
+// GetCertificate
+//
+// The Manager's GetCertificate method returns certificates
+// from the Manager's cache, filling the cache by requesting certificates
+// from LetsEncrypt.org. In this way, a server with a tls.Config.GetCertificate
+// set to m.GetCertificate will demand load a certificate for any host name
+// it serves. To force loading of certificates ahead of time, install m.GetCertificate
+// as before but then call m.Cert for each host name.
+//
+// A Manager can only obtain a certificate for a given host name if it can prove
+// control of that host name to LetsEncrypt.org. By default it proves control by
+// answering an HTTPS-based challenge: when
+// the LetsEncrypt.org servers connect to the named host on port 443 (HTTPS),
+// the TLS SNI handshake must use m.GetCertificate to obtain a per-host certificate.
+// The most common way to satisfy this requirement is for the host name to
+// resolve to the IP address of a (single) computer running m.ServeHTTPS,
+// or at least running a Go TLS server with tls.Config.GetCertificate set to m.GetCertificate.
+// However, other configurations are possible. For example, a group of machines
+// could use an implementation of tls.Config.GetCertificate that cached
+// certificates but handled cache misses by making RPCs to a Manager m
+// on an elected leader machine.
+//
+// In typical usage, then, the setting of tls.Config.GetCertificate to m.GetCertificate
+// serves two purposes: it provides certificates to the TLS server for ordinary serving,
+// and it also answers challenges to prove ownership of the domains in order to
+// obtain those certificates.
+//
+// To force the loading of a certificate for a given host into the Manager's cache,
+// use m.Cert.
+//
+// Persistent Storage
+//
+// If a server always starts with a zero Manager m, the server effectively fetches
+// a new certificate for each of its host name from LetsEncrypt.org on each restart.
+// This is unfortunate both because the server cannot start if LetsEncrypt.org is
+// unavailable and because LetsEncrypt.org limits how often it will issue a certificate
+// for a given host name (at time of writing, the limit is 5 per week for a given host name).
+// To save server state proactively to a cache file and to reload the server state from
+// that same file when creating a new manager, call m.CacheFile with the name of
+// the file to use.
+//
+// For alternate storage uses, m.Marshal returns the current state of the Manager
+// as an opaque string, m.Unmarshal sets the state of the Manager using a string
+// previously returned by m.Marshal (usually a different m), and m.Watch returns
+// a channel that receives notifications about state changes.
+//
+// Limits
+//
+// To avoid hitting basic rate limits on LetsEncrypt.org, a given Manager limits all its
+// interactions to at most one request every minute, with an initial allowed burst of
+// 20 requests.
+//
+// By default, if GetCertificate is asked for a certificate it does not have, it will in turn
+// ask LetsEncrypt.org for that certificate. This opens a potential attack where attackers
+// connect to a server by IP address and pretend to be asking for an incorrect host name.
+// Then GetCertificate will attempt to obtain a certificate for that host, incorrectly,
+// eventually hitting LetsEncrypt.org's rate limit for certificate requests and making it
+// impossible to obtain actual certificates. Because servers hold certificates for months
+// at a time, however, an attack would need to be sustained over a time period
+// of at least a month in order to cause real problems.
+//
+// To mitigate this kind of attack, a given Manager limits
+// itself to an average of one certificate request for a new host every three hours,
+// with an initial allowed burst of up to 20 requests.
+// Long-running servers will therefore stay
+// within the LetsEncrypt.org limit of 300 failed requests per month.
+// Certificate refreshes are not subject to this limit.
+//
+// To eliminate the attack entirely, call m.SetHosts to enumerate the exact set
+// of hosts that are allowed in certificate requests.
+//
+// Web Servers
+//
+// The basic requirement for use of a Manager is that there be an HTTPS server
+// running on port 443 and calling m.GetCertificate to obtain TLS certificates.
+// Using standard primitives, the way to do this is:
+//
+//	srv := &http.Server{
+//		Addr: ":https",
+//		TLSConfig: &tls.Config{
+//			GetCertificate: m.GetCertificate,
+//		},
+//	}
+//	srv.ListenAndServeTLS("", "")
+//
+// However, this pattern of serving HTTPS with demand-loaded TLS certificates
+// comes up enough to wrap into a single method m.ServeHTTPS.
+//
+// Similarly, many HTTPS servers prefer to redirect HTTP clients to the HTTPS URLs.
+// That functionality is provided by RedirectHTTP.
+//
+// The combination of serving HTTPS with demand-loaded TLS certificates and
+// serving HTTPS redirects to HTTP clients is provided by m.Serve, as used in
+// the original example above.
+//
+package letsencrypt
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/json"
+	"encoding/pem"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/net/context"
+	"golang.org/x/time/rate"
+
+	"github.com/xenolf/lego/acme"
+)
+
+const letsEncryptURL = "https://acme-v01.api.letsencrypt.org/directory"
+const debug = false
+
+// A Manager m takes care of obtaining and refreshing a collection of TLS certificates
+// obtained by LetsEncrypt.org.
+//  The zero Manager is not yet registered with LetsEncrypt.org and has no TLS certificates
+// but is nonetheless ready for use.
+// See the package comment for an overview of how to use a Manager.
+type Manager struct {
+	mu           sync.Mutex
+	state        state
+	rateLimit    *rate.Limiter
+	newHostLimit *rate.Limiter
+	certCache    map[string]*cacheEntry
+	certTokens   map[string]*tls.Certificate
+	watchChan    chan struct{}
+}
+
+// Serve runs an HTTP/HTTPS web server using TLS certificates obtained by the manager.
+// The HTTP server redirects all requests to the HTTPS server.
+// The HTTPS server obtains TLS certificates as needed and responds to requests
+// by invoking http.DefaultServeMux.
+//
+// Serve does not return unitil the HTTPS server fails to start or else stops.
+// Either way, Serve can only return a non-nil error, never nil.
+func (m *Manager) Serve() error {
+	l, err := net.Listen("tcp", ":http")
+	if err != nil {
+		return err
+	}
+	defer l.Close()
+	go http.Serve(l, http.HandlerFunc(RedirectHTTP))
+
+	return m.ServeHTTPS()
+}
+
+// ServeHTTPS runs an HTTPS web server using TLS certificates obtained by the manager.
+// The HTTPS server obtains TLS certificates as needed and responds to requests
+// by invoking http.DefaultServeMux.
+// ServeHTTPS does not return unitil the HTTPS server fails to start or else stops.
+// Either way, ServeHTTPS can only return a non-nil error, never nil.
+func (m *Manager) ServeHTTPS() error {
+	srv := &http.Server{
+		Addr: ":https",
+		TLSConfig: &tls.Config{
+			GetCertificate: m.GetCertificate,
+		},
+	}
+	return srv.ListenAndServeTLS("", "")
+}
+
+// RedirectHTTP is an HTTP handler (suitable for use with http.HandleFunc)
+// that responds to all requests by redirecting to the same URL served over HTTPS.
+// It should only be invoked for requests received over HTTP.
+func RedirectHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.TLS != nil || r.Host == "" {
+		http.Error(w, "not found", 404)
+	}
+
+	u := r.URL
+	u.Host = r.Host
+	u.Scheme = "https"
+	http.Redirect(w, r, u.String(), 302)
+}
+
+// state is the serializable state for the Manager.
+// It also implements acme.User.
+type state struct {
+	Email string
+	Reg   *acme.RegistrationResource
+	Key   string
+	key   *ecdsa.PrivateKey
+	Hosts []string
+	Certs map[string]stateCert
+}
+
+func (s *state) GetEmail() string                            { return s.Email }
+func (s *state) GetRegistration() *acme.RegistrationResource { return s.Reg }
+func (s *state) GetPrivateKey() crypto.PrivateKey            { return s.key }
+
+type stateCert struct {
+	Cert string
+	Key  string
+}
+
+func (cert stateCert) toTLS() (*tls.Certificate, error) {
+	c, err := tls.X509KeyPair([]byte(cert.Cert), []byte(cert.Key))
+	if err != nil {
+		return nil, err
+	}
+	return &c, err
+}
+
+type cacheEntry struct {
+	host string
+	m    *Manager
+
+	mu         sync.Mutex
+	cert       *tls.Certificate
+	timeout    time.Time
+	refreshing bool
+	err        error
+}
+
+func (m *Manager) init() {
+	m.mu.Lock()
+	if m.certCache == nil {
+		m.rateLimit = rate.NewLimiter(rate.Every(1*time.Minute), 20)
+		m.newHostLimit = rate.NewLimiter(rate.Every(3*time.Hour), 20)
+		m.certCache = map[string]*cacheEntry{}
+		m.certTokens = map[string]*tls.Certificate{}
+		m.watchChan = make(chan struct{}, 1)
+		m.watchChan <- struct{}{}
+	}
+	m.mu.Unlock()
+}
+
+// Watch returns the manager's watch channel,
+// which delivers a notification after every time the
+// manager's state (as exposed by Marshal and Unmarshal) changes.
+// All calls to Watch return the same watch channel.
+//
+// The watch channel includes notifications about changes
+// before the first call to Watch, so that in the pattern below,
+// the range loop executes once immediately, saving
+// the result of setup (along with any background updates that
+// may have raced in quickly).
+//
+//	m := new(letsencrypt.Manager)
+//	setup(m)
+//	go backgroundUpdates(m)
+//	for range m.Watch() {
+//		save(m.Marshal())
+//	}
+//
+func (m *Manager) Watch() <-chan struct{} {
+	m.init()
+	m.updated()
+	return m.watchChan
+}
+
+func (m *Manager) updated() {
+	select {
+	case m.watchChan <- struct{}{}:
+	default:
+	}
+}
+
+func (m *Manager) CacheFile(name string) error {
+	f, err := os.OpenFile(name, os.O_RDWR|os.O_CREATE, 0600)
+	if err != nil {
+		return err
+	}
+	f.Close()
+	data, err := ioutil.ReadFile(name)
+	if err != nil {
+		return err
+	}
+	if len(data) > 0 {
+		if err := m.Unmarshal(string(data)); err != nil {
+			return err
+		}
+	}
+	go func() {
+		for range m.Watch() {
+			err := ioutil.WriteFile(name, []byte(m.Marshal()), 0600)
+			if err != nil {
+				log.Printf("writing letsencrypt cache: %v", err)
+			}
+		}
+	}()
+	return nil
+}
+
+// Registered reports whether the manager has registered with letsencrypt.org yet.
+func (m *Manager) Registered() bool {
+	m.init()
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	return m.registered()
+}
+
+func (m *Manager) registered() bool {
+	return m.state.Reg != nil && m.state.Reg.Body.Agreement != ""
+}
+
+// Register registers the manager with letsencrypt.org, using the given email address.
+// Registration may require agreeing to the letsencrypt.org terms of service.
+// If so, Register calls prompt(url) where url is the URL of the terms of service.
+// Prompt should report whether the caller agrees to the terms.
+// A nil prompt func is taken to mean that the user always agrees.
+// The email address is sent to LetsEncrypt.org but otherwise unchecked;
+// it can be omitted by passing the empty string.
+//
+// Calling Register is only required to make sure registration uses a
+// particular email address or to insert an explicit prompt into the
+// registration sequence. If the manager is not registered, it will
+// automatically register with no email address and automatic
+// agreement to the terms of service at the first call to Cert or GetCertificate.
+func (m *Manager) Register(email string, prompt func(string) bool) error {
+	m.init()
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	return m.register(email, prompt)
+}
+
+func (m *Manager) register(email string, prompt func(string) bool) error {
+	if m.registered() {
+		return fmt.Errorf("already registered")
+	}
+	m.state.Email = email
+	if m.state.key == nil {
+		key, err := newKey()
+		if err != nil {
+			return fmt.Errorf("generating key: %v", err)
+		}
+		Key, err := marshalKey(key)
+		if err != nil {
+			return fmt.Errorf("generating key: %v", err)
+		}
+		m.state.key = key
+		m.state.Key = string(Key)
+	}
+
+	c, err := acme.NewClient(letsEncryptURL, &m.state, acme.EC256)
+	if err != nil {
+		return fmt.Errorf("create client: %v", err)
+	}
+	reg, err := c.Register()
+	if err != nil {
+		return fmt.Errorf("register: %v", err)
+	}
+
+	m.state.Reg = reg
+	if reg.Body.Agreement == "" {
+		if prompt != nil && !prompt(reg.TosURL) {
+			return fmt.Errorf("did not agree to TOS")
+		}
+		if err := c.AgreeToTOS(); err != nil {
+			return fmt.Errorf("agreeing to TOS: %v", err)
+		}
+	}
+
+	m.updated()
+
+	return nil
+}
+
+// Marshal returns an encoding of the manager's state,
+// suitable for writing to disk and reloading by calling Unmarshal.
+// The state includes registration status, the configured host list
+// from SetHosts, and all known certificates, including their private
+// cryptographic keys.
+// Consequently, the state should be kept private.
+func (m *Manager) Marshal() string {
+	m.init()
+	js, err := json.MarshalIndent(&m.state, "", "\t")
+	if err != nil {
+		panic("unexpected json.Marshal failure")
+	}
+	return string(js)
+}
+
+// Unmarshal restores the state encoded by a previous call to Marshal
+// (perhaps on a different Manager in a different program).
+func (m *Manager) Unmarshal(enc string) error {
+	m.init()
+	var st state
+	if err := json.Unmarshal([]byte(enc), &st); err != nil {
+		return err
+	}
+	if st.Key != "" {
+		key, err := unmarshalKey(st.Key)
+		if err != nil {
+			return err
+		}
+		st.key = key
+	}
+	m.state = st
+	for host, cert := range m.state.Certs {
+		c, err := cert.toTLS()
+		if err != nil {
+			log.Printf("letsencrypt: ignoring entry for %s: %v", host, err)
+			continue
+		}
+		m.certCache[host] = &cacheEntry{host: host, m: m, cert: c}
+	}
+	m.updated()
+	return nil
+}
+
+// SetHosts sets the manager's list of known host names.
+// If the list is non-nil, the manager will only ever attempt to acquire
+// certificates for host names on the list.
+// If the list is nil, the manager does not restrict the hosts it will
+// ask for certificates for.
+func (m *Manager) SetHosts(hosts []string) {
+	m.init()
+	m.mu.Lock()
+	m.state.Hosts = append(m.state.Hosts[:0], hosts...)
+	m.mu.Unlock()
+	m.updated()
+}
+
+// GetCertificate can be placed a tls.Config's GetCertificate field to make
+// the TLS server use Let's Encrypt certificates.
+// Each time a client connects to the TLS server expecting a new host name,
+// the TLS server's call to GetCertificate will trigger an exchange with the
+// Let's Encrypt servers to obtain that certificate, subject to the manager rate limits.
+//
+// As noted in the Manager's documentation comment,
+// to obtain a certificate for a given host name, that name
+// must resolve to a computer running a TLS server on port 443
+// that obtains TLS SNI certificates by calling m.GetCertificate.
+// In the standard usage, then, installing m.GetCertificate in the tls.Config
+// both automatically provisions the TLS certificates needed for
+// ordinary HTTPS service and answers the challenges from LetsEncrypt.org.
+func (m *Manager) GetCertificate(clientHello *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	m.init()
+
+	host := clientHello.ServerName
+
+	if debug {
+		log.Printf("GetCertificate %s", host)
+	}
+
+	if strings.HasSuffix(host, ".acme.invalid") {
+		m.mu.Lock()
+		cert := m.certTokens[host]
+		m.mu.Unlock()
+		if cert == nil {
+			return nil, fmt.Errorf("unknown host")
+		}
+		return cert, nil
+	}
+
+	return m.Cert(host)
+}
+
+// Cert returns the certificate for the given host name, obtaining a new one if necessary.
+//
+// As noted in the documentation for Manager and for the GetCertificate method,
+// obtaining a certificate requires that m.GetCertificate be associated with host.
+// In most servers, simply starting a TLS server with a configuration referring
+// to m.GetCertificate is sufficient, and Cert need not be called.
+//
+// The main use of Cert is to force the manager to obtain a certificate
+// for a particular host name ahead of time.
+func (m *Manager) Cert(host string) (*tls.Certificate, error) {
+	host = strings.ToLower(host)
+	if debug {
+		log.Printf("Cert %s", host)
+	}
+
+	m.init()
+	m.mu.Lock()
+	if !m.registered() {
+		m.register("", nil)
+	}
+
+	ok := false
+	if m.state.Hosts == nil {
+		ok = true
+	} else {
+		for _, h := range m.state.Hosts {
+			if host == h {
+				ok = true
+				break
+			}
+		}
+	}
+	if !ok {
+		m.mu.Unlock()
+		return nil, fmt.Errorf("unknown host")
+	}
+
+	// Otherwise look in our cert cache.
+	entry, ok := m.certCache[host]
+	if !ok {
+		r := m.rateLimit.Reserve()
+		ok := r.OK()
+		if ok {
+			ok = m.newHostLimit.Allow()
+			if !ok {
+				r.Cancel()
+			}
+		}
+		if !ok {
+			m.mu.Unlock()
+			return nil, fmt.Errorf("rate limited")
+		}
+		entry = &cacheEntry{host: host, m: m}
+		m.certCache[host] = entry
+	}
+	m.mu.Unlock()
+
+	entry.mu.Lock()
+	defer entry.mu.Unlock()
+	entry.init()
+	if entry.err != nil {
+		return nil, entry.err
+	}
+	return entry.cert, nil
+}
+
+func (e *cacheEntry) init() {
+	if e.err != nil && time.Now().Before(e.timeout) {
+		return
+	}
+	if e.cert != nil {
+		if e.timeout.IsZero() {
+			t, err := certRefreshTime(e.cert)
+			if err != nil {
+				e.err = err
+				e.timeout = time.Now().Add(1 * time.Minute)
+				e.cert = nil
+				return
+			}
+			e.timeout = t
+		}
+		if time.Now().After(e.timeout) && !e.refreshing {
+			e.refreshing = true
+			go e.refresh()
+		}
+		return
+	}
+
+	cert, refreshTime, err := e.m.verify(e.host)
+	e.m.mu.Lock()
+	e.m.certCache[e.host] = e
+	e.m.mu.Unlock()
+	e.install(cert, refreshTime, err)
+}
+
+func (e *cacheEntry) install(cert *tls.Certificate, refreshTime time.Time, err error) {
+	e.cert = nil
+	e.timeout = time.Time{}
+	e.err = nil
+
+	if err != nil {
+		e.err = err
+		e.timeout = time.Now().Add(1 * time.Minute)
+		return
+	}
+
+	e.cert = cert
+	e.timeout = refreshTime
+}
+
+func (e *cacheEntry) refresh() {
+	e.m.rateLimit.Wait(context.Background())
+	cert, refreshTime, err := e.m.verify(e.host)
+
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	e.refreshing = false
+	if err == nil {
+		e.install(cert, refreshTime, nil)
+	}
+}
+
+func (m *Manager) verify(host string) (cert *tls.Certificate, refreshTime time.Time, err error) {
+	c, err := acme.NewClient(letsEncryptURL, &m.state, acme.EC256)
+	if err != nil {
+		return
+	}
+	if err = c.SetChallengeProvider(acme.TLSSNI01, tlsProvider{m}); err != nil {
+		return
+	}
+	c.SetChallengeProvider(acme.TLSSNI01, tlsProvider{m})
+	c.ExcludeChallenges([]acme.Challenge{acme.HTTP01})
+	acmeCert, errmap := c.ObtainCertificate([]string{host}, true, nil)
+	if len(errmap) > 0 {
+		if debug {
+			log.Printf("ObtainCertificate %v => %v", host, errmap)
+		}
+		err = fmt.Errorf("%v", errmap)
+		return
+	}
+	entryCert := stateCert{
+		Cert: string(acmeCert.Certificate),
+		Key:  string(acmeCert.PrivateKey),
+	}
+	cert, err = entryCert.toTLS()
+	if err != nil {
+		if debug {
+			log.Printf("ObtainCertificate %v toTLS failure: %v", host, err)
+		}
+		err = err
+		return
+	}
+	if refreshTime, err = certRefreshTime(cert); err != nil {
+		return
+	}
+
+	m.mu.Lock()
+	if m.state.Certs == nil {
+		m.state.Certs = make(map[string]stateCert)
+	}
+	m.state.Certs[host] = entryCert
+	m.mu.Unlock()
+	m.updated()
+
+	return cert, refreshTime, nil
+}
+
+func certRefreshTime(cert *tls.Certificate) (time.Time, error) {
+	xc, err := x509.ParseCertificate(cert.Certificate[0])
+	if err != nil {
+		if debug {
+			log.Printf("ObtainCertificate to X.509 failure: %v", err)
+		}
+		return time.Time{}, err
+	}
+	t := xc.NotBefore.Add(xc.NotAfter.Sub(xc.NotBefore) / 2)
+	monthEarly := xc.NotAfter.Add(-30 * 24 * time.Hour)
+	if t.Before(monthEarly) {
+		t = monthEarly
+	}
+	return t, nil
+}
+
+// tlsProvider implements acme.ChallengeProvider for TLS handshake challenges.
+type tlsProvider struct {
+	m *Manager
+}
+
+func (p tlsProvider) Present(domain, token, keyAuth string) error {
+	cert, dom, err := acme.TLSSNI01ChallengeCertDomain(keyAuth)
+	if err != nil {
+		return err
+	}
+
+	p.m.mu.Lock()
+	p.m.certTokens[dom] = &cert
+	p.m.mu.Unlock()
+
+	return nil
+}
+
+func (p tlsProvider) CleanUp(domain, token, keyAuth string) error {
+	_, dom, err := acme.TLSSNI01ChallengeCertDomain(keyAuth)
+	if err != nil {
+		return err
+	}
+
+	p.m.mu.Lock()
+	delete(p.m.certTokens, dom)
+	p.m.mu.Unlock()
+
+	return nil
+}
+
+func marshalKey(key *ecdsa.PrivateKey) ([]byte, error) {
+	data, err := x509.MarshalECPrivateKey(key)
+	if err != nil {
+		return nil, err
+	}
+	return pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: data}), nil
+}
+
+func unmarshalKey(text string) (*ecdsa.PrivateKey, error) {
+	b, _ := pem.Decode([]byte(text))
+	if b == nil {
+		return nil, fmt.Errorf("unmarshalKey: missing key")
+	}
+	if b.Type != "EC PRIVATE KEY" {
+		return nil, fmt.Errorf("unmarshalKey: found %q, not %q", b.Type, "EC PRIVATE KEY")
+	}
+	k, err := x509.ParseECPrivateKey(b.Bytes)
+	if err != nil {
+		return nil, fmt.Errorf("unmarshalKey: %v", err)
+	}
+	return k, nil
+}
+
+func newKey() (*ecdsa.PrivateKey, error) {
+	return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Sebastian Erhart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/challenges.go

@@ -0,0 +1,16 @@
+package acme
+
+// Challenge is a string that identifies a particular type and version of ACME challenge.
+type Challenge string
+
+const (
+	// HTTP01 is the "http-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http
+	// Note: HTTP01ChallengePath returns the URL path to fulfill this challenge
+	HTTP01 = Challenge("http-01")
+	// TLSSNI01 is the "tls-sni-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#tls-with-server-name-indication-tls-sni
+	// Note: TLSSNI01ChallengeCert returns a certificate to fulfill this challenge
+	TLSSNI01 = Challenge("tls-sni-01")
+	// DNS01 is the "dns-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#dns
+	// Note: DNS01Record returns a DNS record which will fulfill this challenge
+	DNS01 = Challenge("dns-01")
+)

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/client.go

@@ -0,0 +1,638 @@
+// Package acme implements the ACME protocol for Let's Encrypt and other conforming providers.
+package acme
+
+import (
+	"crypto"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	// Logger is an optional custom logger.
+	Logger *log.Logger
+)
+
+// logf writes a log entry. It uses Logger if not
+// nil, otherwise it uses the default log.Logger.
+func logf(format string, args ...interface{}) {
+	if Logger != nil {
+		Logger.Printf(format, args...)
+	} else {
+		log.Printf(format, args...)
+	}
+}
+
+// User interface is to be implemented by users of this library.
+// It is used by the client type to get user specific information.
+type User interface {
+	GetEmail() string
+	GetRegistration() *RegistrationResource
+	GetPrivateKey() crypto.PrivateKey
+}
+
+// Interface for all challenge solvers to implement.
+type solver interface {
+	Solve(challenge challenge, domain string) error
+}
+
+type validateFunc func(j *jws, domain, uri string, chlng challenge) error
+
+// Client is the user-friendy way to ACME
+type Client struct {
+	directory  directory
+	user       User
+	jws        *jws
+	keyType    KeyType
+	issuerCert []byte
+	solvers    map[Challenge]solver
+}
+
+// NewClient creates a new ACME client on behalf of the user. The client will depend on
+// the ACME directory located at caDirURL for the rest of its actions. It will
+// generate private keys for certificates of size keyBits.
+func NewClient(caDirURL string, user User, keyType KeyType) (*Client, error) {
+	privKey := user.GetPrivateKey()
+	if privKey == nil {
+		return nil, errors.New("private key was nil")
+	}
+
+	var dir directory
+	if _, err := getJSON(caDirURL, &dir); err != nil {
+		return nil, fmt.Errorf("get directory at '%s': %v", caDirURL, err)
+	}
+
+	if dir.NewRegURL == "" {
+		return nil, errors.New("directory missing new registration URL")
+	}
+	if dir.NewAuthzURL == "" {
+		return nil, errors.New("directory missing new authz URL")
+	}
+	if dir.NewCertURL == "" {
+		return nil, errors.New("directory missing new certificate URL")
+	}
+	if dir.RevokeCertURL == "" {
+		return nil, errors.New("directory missing revoke certificate URL")
+	}
+
+	jws := &jws{privKey: privKey, directoryURL: caDirURL}
+
+	// REVIEW: best possibility?
+	// Add all available solvers with the right index as per ACME
+	// spec to this map. Otherwise they won`t be found.
+	solvers := make(map[Challenge]solver)
+	solvers[HTTP01] = &httpChallenge{jws: jws, validate: validate, provider: &HTTPProviderServer{}}
+	solvers[TLSSNI01] = &tlsSNIChallenge{jws: jws, validate: validate, provider: &TLSProviderServer{}}
+
+	return &Client{directory: dir, user: user, jws: jws, keyType: keyType, solvers: solvers}, nil
+}
+
+// SetChallengeProvider specifies a custom provider that will make the solution available
+func (c *Client) SetChallengeProvider(challenge Challenge, p ChallengeProvider) error {
+	switch challenge {
+	case HTTP01:
+		c.solvers[challenge] = &httpChallenge{jws: c.jws, validate: validate, provider: p}
+	case TLSSNI01:
+		c.solvers[challenge] = &tlsSNIChallenge{jws: c.jws, validate: validate, provider: p}
+	default:
+		return fmt.Errorf("Unknown challenge %v", challenge)
+	}
+	return nil
+}
+
+// SetHTTPAddress specifies a custom interface:port to be used for HTTP based challenges.
+// If this option is not used, the default port 80 and all interfaces will be used.
+// To only specify a port and no interface use the ":port" notation.
+func (c *Client) SetHTTPAddress(iface string) error {
+	host, port, err := net.SplitHostPort(iface)
+	if err != nil {
+		return err
+	}
+
+	if chlng, ok := c.solvers[HTTP01]; ok {
+		chlng.(*httpChallenge).provider = NewHTTPProviderServer(host, port)
+	}
+
+	return nil
+}
+
+// SetTLSAddress specifies a custom interface:port to be used for TLS based challenges.
+// If this option is not used, the default port 443 and all interfaces will be used.
+// To only specify a port and no interface use the ":port" notation.
+func (c *Client) SetTLSAddress(iface string) error {
+	host, port, err := net.SplitHostPort(iface)
+	if err != nil {
+		return err
+	}
+
+	if chlng, ok := c.solvers[TLSSNI01]; ok {
+		chlng.(*tlsSNIChallenge).provider = NewTLSProviderServer(host, port)
+	}
+	return nil
+}
+
+// ExcludeChallenges explicitly removes challenges from the pool for solving.
+func (c *Client) ExcludeChallenges(challenges []Challenge) {
+	// Loop through all challenges and delete the requested one if found.
+	for _, challenge := range challenges {
+		delete(c.solvers, challenge)
+	}
+}
+
+// Register the current account to the ACME server.
+func (c *Client) Register() (*RegistrationResource, error) {
+	if c == nil || c.user == nil {
+		return nil, errors.New("acme: cannot register a nil client or user")
+	}
+	logf("[INFO] acme: Registering account for %s", c.user.GetEmail())
+
+	regMsg := registrationMessage{
+		Resource: "new-reg",
+	}
+	if c.user.GetEmail() != "" {
+		regMsg.Contact = []string{"mailto:" + c.user.GetEmail()}
+	} else {
+		regMsg.Contact = []string{}
+	}
+
+	var serverReg Registration
+	hdr, err := postJSON(c.jws, c.directory.NewRegURL, regMsg, &serverReg)
+	if err != nil {
+		return nil, err
+	}
+
+	reg := &RegistrationResource{Body: serverReg}
+
+	links := parseLinks(hdr["Link"])
+	reg.URI = hdr.Get("Location")
+	if links["terms-of-service"] != "" {
+		reg.TosURL = links["terms-of-service"]
+	}
+
+	if links["next"] != "" {
+		reg.NewAuthzURL = links["next"]
+	} else {
+		return nil, errors.New("acme: The server did not return 'next' link to proceed")
+	}
+
+	return reg, nil
+}
+
+// AgreeToTOS updates the Client registration and sends the agreement to
+// the server.
+func (c *Client) AgreeToTOS() error {
+	reg := c.user.GetRegistration()
+
+	reg.Body.Agreement = c.user.GetRegistration().TosURL
+	reg.Body.Resource = "reg"
+	_, err := postJSON(c.jws, c.user.GetRegistration().URI, c.user.GetRegistration().Body, nil)
+	return err
+}
+
+// ObtainCertificate tries to obtain a single certificate using all domains passed into it.
+// The first domain in domains is used for the CommonName field of the certificate, all other
+// domains are added using the Subject Alternate Names extension. A new private key is generated
+// for every invocation of this function. If you do not want that you can supply your own private key
+// in the privKey parameter. If this parameter is non-nil it will be used instead of generating a new one.
+// If bundle is true, the []byte contains both the issuer certificate and
+// your issued certificate as a bundle.
+// This function will never return a partial certificate. If one domain in the list fails,
+// the whole certificate will fail.
+func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto.PrivateKey) (CertificateResource, map[string]error) {
+	if bundle {
+		logf("[INFO][%s] acme: Obtaining bundled SAN certificate", strings.Join(domains, ", "))
+	} else {
+		logf("[INFO][%s] acme: Obtaining SAN certificate", strings.Join(domains, ", "))
+	}
+
+	challenges, failures := c.getChallenges(domains)
+	// If any challenge fails - return. Do not generate partial SAN certificates.
+	if len(failures) > 0 {
+		return CertificateResource{}, failures
+	}
+
+	errs := c.solveChallenges(challenges)
+	// If any challenge fails - return. Do not generate partial SAN certificates.
+	if len(errs) > 0 {
+		return CertificateResource{}, errs
+	}
+
+	logf("[INFO][%s] acme: Validations succeeded; requesting certificates", strings.Join(domains, ", "))
+
+	cert, err := c.requestCertificate(challenges, bundle, privKey)
+	if err != nil {
+		for _, chln := range challenges {
+			failures[chln.Domain] = err
+		}
+	}
+
+	return cert, failures
+}
+
+// RevokeCertificate takes a PEM encoded certificate or bundle and tries to revoke it at the CA.
+func (c *Client) RevokeCertificate(certificate []byte) error {
+	certificates, err := parsePEMBundle(certificate)
+	if err != nil {
+		return err
+	}
+
+	x509Cert := certificates[0]
+	if x509Cert.IsCA {
+		return fmt.Errorf("Certificate bundle starts with a CA certificate")
+	}
+
+	encodedCert := base64.URLEncoding.EncodeToString(x509Cert.Raw)
+
+	_, err = postJSON(c.jws, c.directory.RevokeCertURL, revokeCertMessage{Resource: "revoke-cert", Certificate: encodedCert}, nil)
+	return err
+}
+
+// RenewCertificate takes a CertificateResource and tries to renew the certificate.
+// If the renewal process succeeds, the new certificate will ge returned in a new CertResource.
+// Please be aware that this function will return a new certificate in ANY case that is not an error.
+// If the server does not provide us with a new cert on a GET request to the CertURL
+// this function will start a new-cert flow where a new certificate gets generated.
+// If bundle is true, the []byte contains both the issuer certificate and
+// your issued certificate as a bundle.
+// For private key reuse the PrivateKey property of the passed in CertificateResource should be non-nil.
+func (c *Client) RenewCertificate(cert CertificateResource, bundle bool) (CertificateResource, error) {
+	// Input certificate is PEM encoded. Decode it here as we may need the decoded
+	// cert later on in the renewal process. The input may be a bundle or a single certificate.
+	certificates, err := parsePEMBundle(cert.Certificate)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	x509Cert := certificates[0]
+	if x509Cert.IsCA {
+		return CertificateResource{}, fmt.Errorf("[%s] Certificate bundle starts with a CA certificate", cert.Domain)
+	}
+
+	// This is just meant to be informal for the user.
+	timeLeft := x509Cert.NotAfter.Sub(time.Now().UTC())
+	logf("[INFO][%s] acme: Trying renewal with %d hours remaining", cert.Domain, int(timeLeft.Hours()))
+
+	// The first step of renewal is to check if we get a renewed cert
+	// directly from the cert URL.
+	resp, err := httpGet(cert.CertURL)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+	defer resp.Body.Close()
+	serverCertBytes, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	serverCert, err := x509.ParseCertificate(serverCertBytes)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	// If the server responds with a different certificate we are effectively renewed.
+	// TODO: Further test if we can actually use the new certificate (Our private key works)
+	if !x509Cert.Equal(serverCert) {
+		logf("[INFO][%s] acme: Server responded with renewed certificate", cert.Domain)
+		issuedCert := pemEncode(derCertificateBytes(serverCertBytes))
+		// If bundle is true, we want to return a certificate bundle.
+		// To do this, we need the issuer certificate.
+		if bundle {
+			// The issuer certificate link is always supplied via an "up" link
+			// in the response headers of a new certificate.
+			links := parseLinks(resp.Header["Link"])
+			issuerCert, err := c.getIssuerCertificate(links["up"])
+			if err != nil {
+				// If we fail to acquire the issuer cert, return the issued certificate - do not fail.
+				logf("[ERROR][%s] acme: Could not bundle issuer certificate: %v", cert.Domain, err)
+			} else {
+				// Success - append the issuer cert to the issued cert.
+				issuerCert = pemEncode(derCertificateBytes(issuerCert))
+				issuedCert = append(issuedCert, issuerCert...)
+			}
+		}
+
+		cert.Certificate = issuedCert
+		return cert, nil
+	}
+
+	var privKey crypto.PrivateKey
+	if cert.PrivateKey != nil {
+		privKey, err = parsePEMPrivateKey(cert.PrivateKey)
+		if err != nil {
+			return CertificateResource{}, err
+		}
+	}
+
+	var domains []string
+	var failures map[string]error
+	// check for SAN certificate
+	if len(x509Cert.DNSNames) > 1 {
+		domains = append(domains, x509Cert.Subject.CommonName)
+		for _, sanDomain := range x509Cert.DNSNames {
+			if sanDomain == x509Cert.Subject.CommonName {
+				continue
+			}
+			domains = append(domains, sanDomain)
+		}
+	} else {
+		domains = append(domains, x509Cert.Subject.CommonName)
+	}
+
+	newCert, failures := c.ObtainCertificate(domains, bundle, privKey)
+	return newCert, failures[cert.Domain]
+}
+
+// Looks through the challenge combinations to find a solvable match.
+// Then solves the challenges in series and returns.
+func (c *Client) solveChallenges(challenges []authorizationResource) map[string]error {
+	// loop through the resources, basically through the domains.
+	failures := make(map[string]error)
+	for _, authz := range challenges {
+		// no solvers - no solving
+		if solvers := c.chooseSolvers(authz.Body, authz.Domain); solvers != nil {
+			for i, solver := range solvers {
+				// TODO: do not immediately fail if one domain fails to validate.
+				err := solver.Solve(authz.Body.Challenges[i], authz.Domain)
+				if err != nil {
+					failures[authz.Domain] = err
+				}
+			}
+		} else {
+			failures[authz.Domain] = fmt.Errorf("[%s] acme: Could not determine solvers", authz.Domain)
+		}
+	}
+
+	return failures
+}
+
+// Checks all combinations from the server and returns an array of
+// solvers which should get executed in series.
+func (c *Client) chooseSolvers(auth authorization, domain string) map[int]solver {
+	for _, combination := range auth.Combinations {
+		solvers := make(map[int]solver)
+		for _, idx := range combination {
+			if solver, ok := c.solvers[auth.Challenges[idx].Type]; ok {
+				solvers[idx] = solver
+			} else {
+				logf("[INFO][%s] acme: Could not find solver for: %s", domain, auth.Challenges[idx].Type)
+			}
+		}
+
+		// If we can solve the whole combination, return the solvers
+		if len(solvers) == len(combination) {
+			return solvers
+		}
+	}
+	return nil
+}
+
+// Get the challenges needed to proof our identifier to the ACME server.
+func (c *Client) getChallenges(domains []string) ([]authorizationResource, map[string]error) {
+	resc, errc := make(chan authorizationResource), make(chan domainError)
+
+	for _, domain := range domains {
+		go func(domain string) {
+			authMsg := authorization{Resource: "new-authz", Identifier: identifier{Type: "dns", Value: domain}}
+			var authz authorization
+			hdr, err := postJSON(c.jws, c.user.GetRegistration().NewAuthzURL, authMsg, &authz)
+			if err != nil {
+				errc <- domainError{Domain: domain, Error: err}
+				return
+			}
+
+			links := parseLinks(hdr["Link"])
+			if links["next"] == "" {
+				logf("[ERROR][%s] acme: Server did not provide next link to proceed", domain)
+				return
+			}
+
+			resc <- authorizationResource{Body: authz, NewCertURL: links["next"], AuthURL: hdr.Get("Location"), Domain: domain}
+		}(domain)
+	}
+
+	responses := make(map[string]authorizationResource)
+	failures := make(map[string]error)
+	for i := 0; i < len(domains); i++ {
+		select {
+		case res := <-resc:
+			responses[res.Domain] = res
+		case err := <-errc:
+			failures[err.Domain] = err.Error
+		}
+	}
+
+	challenges := make([]authorizationResource, 0, len(responses))
+	for _, domain := range domains {
+		if challenge, ok := responses[domain]; ok {
+			challenges = append(challenges, challenge)
+		}
+	}
+
+	close(resc)
+	close(errc)
+
+	return challenges, failures
+}
+
+func (c *Client) requestCertificate(authz []authorizationResource, bundle bool, privKey crypto.PrivateKey) (CertificateResource, error) {
+	if len(authz) == 0 {
+		return CertificateResource{}, errors.New("Passed no authorizations to requestCertificate!")
+	}
+
+	commonName := authz[0]
+	var err error
+	if privKey == nil {
+		privKey, err = generatePrivateKey(c.keyType)
+		if err != nil {
+			return CertificateResource{}, err
+		}
+	}
+
+	var san []string
+	var authURLs []string
+	for _, auth := range authz[1:] {
+		san = append(san, auth.Domain)
+		authURLs = append(authURLs, auth.AuthURL)
+	}
+
+	// TODO: should the CSR be customizable?
+	csr, err := generateCsr(privKey, commonName.Domain, san)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	csrString := base64.URLEncoding.EncodeToString(csr)
+	jsonBytes, err := json.Marshal(csrMessage{Resource: "new-cert", Csr: csrString, Authorizations: authURLs})
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	resp, err := c.jws.post(commonName.NewCertURL, jsonBytes)
+	if err != nil {
+		return CertificateResource{}, err
+	}
+
+	privateKeyPem := pemEncode(privKey)
+	cerRes := CertificateResource{
+		Domain:     commonName.Domain,
+		CertURL:    resp.Header.Get("Location"),
+		PrivateKey: privateKeyPem}
+
+	for {
+		switch resp.StatusCode {
+		case 201, 202:
+			cert, err := ioutil.ReadAll(limitReader(resp.Body, 1024*1024))
+			resp.Body.Close()
+			if err != nil {
+				return CertificateResource{}, err
+			}
+
+			// The server returns a body with a length of zero if the
+			// certificate was not ready at the time this request completed.
+			// Otherwise the body is the certificate.
+			if len(cert) > 0 {
+
+				cerRes.CertStableURL = resp.Header.Get("Content-Location")
+				cerRes.AccountRef = c.user.GetRegistration().URI
+
+				issuedCert := pemEncode(derCertificateBytes(cert))
+				// If bundle is true, we want to return a certificate bundle.
+				// To do this, we need the issuer certificate.
+				if bundle {
+					// The issuer certificate link is always supplied via an "up" link
+					// in the response headers of a new certificate.
+					links := parseLinks(resp.Header["Link"])
+					issuerCert, err := c.getIssuerCertificate(links["up"])
+					if err != nil {
+						// If we fail to acquire the issuer cert, return the issued certificate - do not fail.
+						logf("[WARNING][%s] acme: Could not bundle issuer certificate: %v", commonName.Domain, err)
+					} else {
+						// Success - append the issuer cert to the issued cert.
+						issuerCert = pemEncode(derCertificateBytes(issuerCert))
+						issuedCert = append(issuedCert, issuerCert...)
+					}
+				}
+
+				cerRes.Certificate = issuedCert
+				logf("[INFO][%s] Server responded with a certificate.", commonName.Domain)
+				return cerRes, nil
+			}
+
+			// The certificate was granted but is not yet issued.
+			// Check retry-after and loop.
+			ra := resp.Header.Get("Retry-After")
+			retryAfter, err := strconv.Atoi(ra)
+			if err != nil {
+				return CertificateResource{}, err
+			}
+
+			logf("[INFO][%s] acme: Server responded with status 202; retrying after %ds", commonName.Domain, retryAfter)
+			time.Sleep(time.Duration(retryAfter) * time.Second)
+
+			break
+		default:
+			return CertificateResource{}, handleHTTPError(resp)
+		}
+
+		resp, err = httpGet(cerRes.CertURL)
+		if err != nil {
+			return CertificateResource{}, err
+		}
+	}
+}
+
+// getIssuerCertificate requests the issuer certificate and caches it for
+// subsequent requests.
+func (c *Client) getIssuerCertificate(url string) ([]byte, error) {
+	logf("[INFO] acme: Requesting issuer cert from %s", url)
+	if c.issuerCert != nil {
+		return c.issuerCert, nil
+	}
+
+	resp, err := httpGet(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	issuerBytes, err := ioutil.ReadAll(limitReader(resp.Body, 1024*1024))
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = x509.ParseCertificate(issuerBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	c.issuerCert = issuerBytes
+	return issuerBytes, err
+}
+
+func parseLinks(links []string) map[string]string {
+	aBrkt := regexp.MustCompile("[<>]")
+	slver := regexp.MustCompile("(.+) *= *\"(.+)\"")
+	linkMap := make(map[string]string)
+
+	for _, link := range links {
+
+		link = aBrkt.ReplaceAllString(link, "")
+		parts := strings.Split(link, ";")
+
+		matches := slver.FindStringSubmatch(parts[1])
+		if len(matches) > 0 {
+			linkMap[matches[2]] = parts[0]
+		}
+	}
+
+	return linkMap
+}
+
+// validate makes the ACME server start validating a
+// challenge response, only returning once it is done.
+func validate(j *jws, domain, uri string, chlng challenge) error {
+	var challengeResponse challenge
+
+	hdr, err := postJSON(j, uri, chlng, &challengeResponse)
+	if err != nil {
+		return err
+	}
+
+	// After the path is sent, the ACME server will access our server.
+	// Repeatedly check the server for an updated status on our request.
+	for {
+		switch challengeResponse.Status {
+		case "valid":
+			logf("[INFO][%s] The server validated our request", domain)
+			return nil
+		case "pending":
+			break
+		case "invalid":
+			return handleChallengeError(challengeResponse)
+		default:
+			return errors.New("The server returned an unexpected state.")
+		}
+
+		ra, err := strconv.Atoi(hdr.Get("Retry-After"))
+		if err != nil {
+			// The ACME server MUST return a Retry-After.
+			// If it doesn't, we'll just poll hard.
+			ra = 1
+		}
+		time.Sleep(time.Duration(ra) * time.Second)
+
+		hdr, err = getJSON(uri, &challengeResponse)
+		if err != nil {
+			return err
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/client_test.go

@@ -0,0 +1,198 @@
+package acme
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"encoding/json"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestNewClient(t *testing.T) {
+	keyBits := 32 // small value keeps test fast
+	keyType := RSA2048
+	key, err := rsa.GenerateKey(rand.Reader, keyBits)
+	if err != nil {
+		t.Fatal("Could not generate test key:", err)
+	}
+	user := mockUser{
+		email:      "test@test.com",
+		regres:     new(RegistrationResource),
+		privatekey: key,
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		data, _ := json.Marshal(directory{NewAuthzURL: "http://test", NewCertURL: "http://test", NewRegURL: "http://test", RevokeCertURL: "http://test"})
+		w.Write(data)
+	}))
+
+	client, err := NewClient(ts.URL, user, keyType)
+	if err != nil {
+		t.Fatalf("Could not create client: %v", err)
+	}
+
+	if client.jws == nil {
+		t.Fatalf("Expected client.jws to not be nil")
+	}
+	if expected, actual := key, client.jws.privKey; actual != expected {
+		t.Errorf("Expected jws.privKey to be %p but was %p", expected, actual)
+	}
+
+	if client.keyType != keyType {
+		t.Errorf("Expected keyType to be %s but was %s", keyType, client.keyType)
+	}
+
+	if expected, actual := 2, len(client.solvers); actual != expected {
+		t.Fatalf("Expected %d solver(s), got %d", expected, actual)
+	}
+}
+
+func TestClientOptPort(t *testing.T) {
+	keyBits := 32 // small value keeps test fast
+	key, err := rsa.GenerateKey(rand.Reader, keyBits)
+	if err != nil {
+		t.Fatal("Could not generate test key:", err)
+	}
+	user := mockUser{
+		email:      "test@test.com",
+		regres:     new(RegistrationResource),
+		privatekey: key,
+	}
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		data, _ := json.Marshal(directory{NewAuthzURL: "http://test", NewCertURL: "http://test", NewRegURL: "http://test", RevokeCertURL: "http://test"})
+		w.Write(data)
+	}))
+
+	optPort := "1234"
+	optHost := ""
+	client, err := NewClient(ts.URL, user, RSA2048)
+	if err != nil {
+		t.Fatalf("Could not create client: %v", err)
+	}
+	client.SetHTTPAddress(net.JoinHostPort(optHost, optPort))
+	client.SetTLSAddress(net.JoinHostPort(optHost, optPort))
+
+	httpSolver, ok := client.solvers[HTTP01].(*httpChallenge)
+	if !ok {
+		t.Fatal("Expected http-01 solver to be httpChallenge type")
+	}
+	if httpSolver.jws != client.jws {
+		t.Error("Expected http-01 to have same jws as client")
+	}
+	if got := httpSolver.provider.(*HTTPProviderServer).port; got != optPort {
+		t.Errorf("Expected http-01 to have port %s but was %s", optPort, got)
+	}
+	if got := httpSolver.provider.(*HTTPProviderServer).iface; got != optHost {
+		t.Errorf("Expected http-01 to have iface %s but was %s", optHost, got)
+	}
+
+	httpsSolver, ok := client.solvers[TLSSNI01].(*tlsSNIChallenge)
+	if !ok {
+		t.Fatal("Expected tls-sni-01 solver to be httpChallenge type")
+	}
+	if httpsSolver.jws != client.jws {
+		t.Error("Expected tls-sni-01 to have same jws as client")
+	}
+	if got := httpsSolver.provider.(*TLSProviderServer).port; got != optPort {
+		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optPort, got)
+	}
+	if got := httpsSolver.provider.(*TLSProviderServer).iface; got != optHost {
+		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optHost, got)
+	}
+
+	// test setting different host
+	optHost = "127.0.0.1"
+	client.SetHTTPAddress(net.JoinHostPort(optHost, optPort))
+	client.SetTLSAddress(net.JoinHostPort(optHost, optPort))
+
+	if got := httpSolver.provider.(*HTTPProviderServer).iface; got != optHost {
+		t.Errorf("Expected http-01 to have iface %s but was %s", optHost, got)
+	}
+	if got := httpsSolver.provider.(*TLSProviderServer).port; got != optPort {
+		t.Errorf("Expected tls-sni-01 to have port %s but was %s", optPort, got)
+	}
+}
+
+func TestValidate(t *testing.T) {
+	var statuses []string
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Minimal stub ACME server for validation.
+		w.Header().Add("Replay-Nonce", "12345")
+		w.Header().Add("Retry-After", "0")
+		switch r.Method {
+		case "HEAD":
+		case "POST":
+			st := statuses[0]
+			statuses = statuses[1:]
+			writeJSONResponse(w, &challenge{Type: "http-01", Status: st, URI: "http://example.com/", Token: "token"})
+
+		case "GET":
+			st := statuses[0]
+			statuses = statuses[1:]
+			writeJSONResponse(w, &challenge{Type: "http-01", Status: st, URI: "http://example.com/", Token: "token"})
+
+		default:
+			http.Error(w, r.Method, http.StatusMethodNotAllowed)
+		}
+	}))
+	defer ts.Close()
+
+	privKey, _ := rsa.GenerateKey(rand.Reader, 512)
+	j := &jws{privKey: privKey, directoryURL: ts.URL}
+
+	tsts := []struct {
+		name     string
+		statuses []string
+		want     string
+	}{
+		{"POST-unexpected", []string{"weird"}, "unexpected"},
+		{"POST-valid", []string{"valid"}, ""},
+		{"POST-invalid", []string{"invalid"}, "Error Detail"},
+		{"GET-unexpected", []string{"pending", "weird"}, "unexpected"},
+		{"GET-valid", []string{"pending", "valid"}, ""},
+		{"GET-invalid", []string{"pending", "invalid"}, "Error Detail"},
+	}
+
+	for _, tst := range tsts {
+		statuses = tst.statuses
+		if err := validate(j, "example.com", ts.URL, challenge{Type: "http-01", Token: "token"}); err == nil && tst.want != "" {
+			t.Errorf("[%s] validate: got error %v, want something with %q", tst.name, err, tst.want)
+		} else if err != nil && !strings.Contains(err.Error(), tst.want) {
+			t.Errorf("[%s] validate: got error %v, want something with %q", tst.name, err, tst.want)
+		}
+	}
+}
+
+// writeJSONResponse marshals the body as JSON and writes it to the response.
+func writeJSONResponse(w http.ResponseWriter, body interface{}) {
+	bs, err := json.Marshal(body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	if _, err := w.Write(bs); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+// stubValidate is like validate, except it does nothing.
+func stubValidate(j *jws, domain, uri string, chlng challenge) error {
+	return nil
+}
+
+type mockUser struct {
+	email      string
+	regres     *RegistrationResource
+	privatekey *rsa.PrivateKey
+}
+
+func (u mockUser) GetEmail() string                       { return u.email }
+func (u mockUser) GetRegistration() *RegistrationResource { return u.regres }
+func (u mockUser) GetPrivateKey() crypto.PrivateKey       { return u.privatekey }

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/crypto.go

@@ -0,0 +1,323 @@
+package acme
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math/big"
+	"net/http"
+	"strings"
+	"time"
+
+	"golang.org/x/crypto/ocsp"
+)
+
+// KeyType represents the key algo as well as the key size or curve to use.
+type KeyType string
+type derCertificateBytes []byte
+
+// Constants for all key types we support.
+const (
+	EC256   = KeyType("P256")
+	EC384   = KeyType("P384")
+	RSA2048 = KeyType("2048")
+	RSA4096 = KeyType("4096")
+	RSA8192 = KeyType("8192")
+)
+
+const (
+	// OCSPGood means that the certificate is valid.
+	OCSPGood = ocsp.Good
+	// OCSPRevoked means that the certificate has been deliberately revoked.
+	OCSPRevoked = ocsp.Revoked
+	// OCSPUnknown means that the OCSP responder doesn't know about the certificate.
+	OCSPUnknown = ocsp.Unknown
+	// OCSPServerFailed means that the OCSP responder failed to process the request.
+	OCSPServerFailed = ocsp.ServerFailed
+)
+
+// GetOCSPForCert takes a PEM encoded cert or cert bundle returning the raw OCSP response,
+// the parsed response, and an error, if any. The returned []byte can be passed directly
+// into the OCSPStaple property of a tls.Certificate. If the bundle only contains the
+// issued certificate, this function will try to get the issuer certificate from the
+// IssuingCertificateURL in the certificate. If the []byte and/or ocsp.Response return
+// values are nil, the OCSP status may be assumed OCSPUnknown.
+func GetOCSPForCert(bundle []byte) ([]byte, *ocsp.Response, error) {
+	certificates, err := parsePEMBundle(bundle)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// We expect the certificate slice to be ordered downwards the chain.
+	// SRV CRT -> CA. We need to pull the leaf and issuer certs out of it,
+	// which should always be the first two certificates. If there's no
+	// OCSP server listed in the leaf cert, there's nothing to do. And if
+	// we have only one certificate so far, we need to get the issuer cert.
+	issuedCert := certificates[0]
+	if len(issuedCert.OCSPServer) == 0 {
+		return nil, nil, errors.New("no OCSP server specified in cert")
+	}
+	if len(certificates) == 1 {
+		// TODO: build fallback. If this fails, check the remaining array entries.
+		if len(issuedCert.IssuingCertificateURL) == 0 {
+			return nil, nil, errors.New("no issuing certificate URL")
+		}
+
+		resp, err := httpGet(issuedCert.IssuingCertificateURL[0])
+		if err != nil {
+			return nil, nil, err
+		}
+		defer resp.Body.Close()
+
+		issuerBytes, err := ioutil.ReadAll(limitReader(resp.Body, 1024*1024))
+		if err != nil {
+			return nil, nil, err
+		}
+
+		issuerCert, err := x509.ParseCertificate(issuerBytes)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		// Insert it into the slice on position 0
+		// We want it ordered right SRV CRT -> CA
+		certificates = append(certificates, issuerCert)
+	}
+	issuerCert := certificates[1]
+
+	// Finally kick off the OCSP request.
+	ocspReq, err := ocsp.CreateRequest(issuedCert, issuerCert, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	reader := bytes.NewReader(ocspReq)
+	req, err := httpPost(issuedCert.OCSPServer[0], "application/ocsp-request", reader)
+	if err != nil {
+		return nil, nil, err
+	}
+	defer req.Body.Close()
+
+	ocspResBytes, err := ioutil.ReadAll(limitReader(req.Body, 1024*1024))
+	ocspRes, err := ocsp.ParseResponse(ocspResBytes, issuerCert)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if ocspRes.Certificate == nil {
+		err = ocspRes.CheckSignatureFrom(issuerCert)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+
+	return ocspResBytes, ocspRes, nil
+}
+
+func getKeyAuthorization(token string, key interface{}) (string, error) {
+	var publicKey crypto.PublicKey
+	switch k := key.(type) {
+	case *ecdsa.PrivateKey:
+		publicKey = k.Public()
+	case *rsa.PrivateKey:
+		publicKey = k.Public()
+	}
+
+	// Generate the Key Authorization for the challenge
+	jwk := keyAsJWK(publicKey)
+	if jwk == nil {
+		return "", errors.New("Could not generate JWK from key.")
+	}
+	thumbBytes, err := jwk.Thumbprint(crypto.SHA256)
+	if err != nil {
+		return "", err
+	}
+
+	// unpad the base64URL
+	keyThumb := base64.URLEncoding.EncodeToString(thumbBytes)
+	index := strings.Index(keyThumb, "=")
+	if index != -1 {
+		keyThumb = keyThumb[:index]
+	}
+
+	return token + "." + keyThumb, nil
+}
+
+// parsePEMBundle parses a certificate bundle from top to bottom and returns
+// a slice of x509 certificates. This function will error if no certificates are found.
+func parsePEMBundle(bundle []byte) ([]*x509.Certificate, error) {
+	var certificates []*x509.Certificate
+	var certDERBlock *pem.Block
+
+	for {
+		certDERBlock, bundle = pem.Decode(bundle)
+		if certDERBlock == nil {
+			break
+		}
+
+		if certDERBlock.Type == "CERTIFICATE" {
+			cert, err := x509.ParseCertificate(certDERBlock.Bytes)
+			if err != nil {
+				return nil, err
+			}
+			certificates = append(certificates, cert)
+		}
+	}
+
+	if len(certificates) == 0 {
+		return nil, errors.New("No certificates were found while parsing the bundle.")
+	}
+
+	return certificates, nil
+}
+
+func parsePEMPrivateKey(key []byte) (crypto.PrivateKey, error) {
+	keyBlock, _ := pem.Decode(key)
+
+	switch keyBlock.Type {
+	case "RSA PRIVATE KEY":
+		return x509.ParsePKCS1PrivateKey(keyBlock.Bytes)
+	case "EC PRIVATE KEY":
+		return x509.ParseECPrivateKey(keyBlock.Bytes)
+	default:
+		return nil, errors.New("Unknown PEM header value")
+	}
+}
+
+func generatePrivateKey(keyType KeyType) (crypto.PrivateKey, error) {
+
+	switch keyType {
+	case EC256:
+		return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	case EC384:
+		return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+	case RSA2048:
+		return rsa.GenerateKey(rand.Reader, 2048)
+	case RSA4096:
+		return rsa.GenerateKey(rand.Reader, 4096)
+	case RSA8192:
+		return rsa.GenerateKey(rand.Reader, 8192)
+	}
+
+	return nil, fmt.Errorf("Invalid KeyType: %s", keyType)
+}
+
+func generateCsr(privateKey crypto.PrivateKey, domain string, san []string) ([]byte, error) {
+	template := x509.CertificateRequest{
+		Subject: pkix.Name{
+			CommonName: domain,
+		},
+	}
+
+	if len(san) > 0 {
+		template.DNSNames = san
+	}
+
+	return x509.CreateCertificateRequest(rand.Reader, &template, privateKey)
+}
+
+func pemEncode(data interface{}) []byte {
+	var pemBlock *pem.Block
+	switch key := data.(type) {
+	case *ecdsa.PrivateKey:
+		keyBytes, _ := x509.MarshalECPrivateKey(key)
+		pemBlock = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
+	case *rsa.PrivateKey:
+		pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
+		break
+	case derCertificateBytes:
+		pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.(derCertificateBytes))}
+	}
+
+	return pem.EncodeToMemory(pemBlock)
+}
+
+func pemDecode(data []byte) (*pem.Block, error) {
+	pemBlock, _ := pem.Decode(data)
+	if pemBlock == nil {
+		return nil, fmt.Errorf("Pem decode did not yield a valid block. Is the certificate in the right format?")
+	}
+
+	return pemBlock, nil
+}
+
+func pemDecodeTox509(pem []byte) (*x509.Certificate, error) {
+	pemBlock, err := pemDecode(pem)
+	if pemBlock == nil {
+		return nil, err
+	}
+
+	return x509.ParseCertificate(pemBlock.Bytes)
+}
+
+// GetPEMCertExpiration returns the "NotAfter" date of a PEM encoded certificate.
+// The certificate has to be PEM encoded. Any other encodings like DER will fail.
+func GetPEMCertExpiration(cert []byte) (time.Time, error) {
+	pemBlock, err := pemDecode(cert)
+	if pemBlock == nil {
+		return time.Time{}, err
+	}
+
+	return getCertExpiration(pemBlock.Bytes)
+}
+
+// getCertExpiration returns the "NotAfter" date of a DER encoded certificate.
+func getCertExpiration(cert []byte) (time.Time, error) {
+	pCert, err := x509.ParseCertificate(cert)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	return pCert.NotAfter, nil
+}
+
+func generatePemCert(privKey *rsa.PrivateKey, domain string) ([]byte, error) {
+	derBytes, err := generateDerCert(privKey, time.Time{}, domain)
+	if err != nil {
+		return nil, err
+	}
+
+	return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}), nil
+}
+
+func generateDerCert(privKey *rsa.PrivateKey, expiration time.Time, domain string) ([]byte, error) {
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		return nil, err
+	}
+
+	if expiration.IsZero() {
+		expiration = time.Now().Add(365)
+	}
+
+	template := x509.Certificate{
+		SerialNumber: serialNumber,
+		Subject: pkix.Name{
+			CommonName: "ACME Challenge TEMP",
+		},
+		NotBefore: time.Now(),
+		NotAfter:  expiration,
+
+		KeyUsage:              x509.KeyUsageKeyEncipherment,
+		BasicConstraintsValid: true,
+		DNSNames:              []string{domain},
+	}
+
+	return x509.CreateCertificate(rand.Reader, &template, &template, &privKey.PublicKey, privKey)
+}
+
+func limitReader(rd io.ReadCloser, numBytes int64) io.ReadCloser {
+	return http.MaxBytesReader(nil, rd, numBytes)
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/crypto_test.go

@@ -0,0 +1,93 @@
+package acme
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"testing"
+	"time"
+)
+
+func TestGeneratePrivateKey(t *testing.T) {
+	key, err := generatePrivateKey(RSA2048)
+	if err != nil {
+		t.Error("Error generating private key:", err)
+	}
+	if key == nil {
+		t.Error("Expected key to not be nil, but it was")
+	}
+}
+
+func TestGenerateCSR(t *testing.T) {
+	key, err := rsa.GenerateKey(rand.Reader, 512)
+	if err != nil {
+		t.Fatal("Error generating private key:", err)
+	}
+
+	csr, err := generateCsr(key, "fizz.buzz", nil)
+	if err != nil {
+		t.Error("Error generating CSR:", err)
+	}
+	if csr == nil || len(csr) == 0 {
+		t.Error("Expected CSR with data, but it was nil or length 0")
+	}
+}
+
+func TestPEMEncode(t *testing.T) {
+	buf := bytes.NewBufferString("TestingRSAIsSoMuchFun")
+
+	reader := MockRandReader{b: buf}
+	key, err := rsa.GenerateKey(reader, 32)
+	if err != nil {
+		t.Fatal("Error generating private key:", err)
+	}
+
+	data := pemEncode(key)
+
+	if data == nil {
+		t.Fatal("Expected result to not be nil, but it was")
+	}
+	if len(data) != 127 {
+		t.Errorf("Expected PEM encoding to be length 127, but it was %d", len(data))
+	}
+}
+
+func TestPEMCertExpiration(t *testing.T) {
+	privKey, err := generatePrivateKey(RSA2048)
+	if err != nil {
+		t.Fatal("Error generating private key:", err)
+	}
+
+	expiration := time.Now().Add(365)
+	expiration = expiration.Round(time.Second)
+	certBytes, err := generateDerCert(privKey.(*rsa.PrivateKey), expiration, "test.com")
+	if err != nil {
+		t.Fatal("Error generating cert:", err)
+	}
+
+	buf := bytes.NewBufferString("TestingRSAIsSoMuchFun")
+
+	// Some random string should return an error.
+	if ctime, err := GetPEMCertExpiration(buf.Bytes()); err == nil {
+		t.Errorf("Expected getCertExpiration to return an error for garbage string but returned %v", ctime)
+	}
+
+	// A DER encoded certificate should return an error.
+	if _, err := GetPEMCertExpiration(certBytes); err == nil {
+		t.Errorf("Expected getCertExpiration to return an error for DER certificates but returned none.")
+	}
+
+	// A PEM encoded certificate should work ok.
+	pemCert := pemEncode(derCertificateBytes(certBytes))
+	if ctime, err := GetPEMCertExpiration(pemCert); err != nil || !ctime.Equal(expiration.UTC()) {
+		t.Errorf("Expected getCertExpiration to return %v but returned %v. Error: %v", expiration, ctime, err)
+	}
+}
+
+type MockRandReader struct {
+	b *bytes.Buffer
+}
+
+func (r MockRandReader) Read(p []byte) (int, error) {
+	return r.b.Read(p)
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/error.go

@@ -0,0 +1,73 @@
+package acme
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+const (
+	tosAgreementError = "Must agree to subscriber agreement before any further actions"
+)
+
+// RemoteError is the base type for all errors specific to the ACME protocol.
+type RemoteError struct {
+	StatusCode int    `json:"status,omitempty"`
+	Type       string `json:"type"`
+	Detail     string `json:"detail"`
+}
+
+func (e RemoteError) Error() string {
+	return fmt.Sprintf("acme: Error %d - %s - %s", e.StatusCode, e.Type, e.Detail)
+}
+
+// TOSError represents the error which is returned if the user needs to
+// accept the TOS.
+// TODO: include the new TOS url if we can somehow obtain it.
+type TOSError struct {
+	RemoteError
+}
+
+type domainError struct {
+	Domain string
+	Error  error
+}
+
+type challengeError struct {
+	RemoteError
+	records []validationRecord
+}
+
+func (c challengeError) Error() string {
+
+	var errStr string
+	for _, validation := range c.records {
+		errStr = errStr + fmt.Sprintf("\tValidation for %s:%s\n\tResolved to:\n\t\t%s\n\tUsed: %s\n\n",
+			validation.Hostname, validation.Port, strings.Join(validation.ResolvedAddresses, "\n\t\t"), validation.UsedAddress)
+	}
+
+	return fmt.Sprintf("%s\nError Detail:\n%s", c.RemoteError.Error(), errStr)
+}
+
+func handleHTTPError(resp *http.Response) error {
+	var errorDetail RemoteError
+	decoder := json.NewDecoder(resp.Body)
+	err := decoder.Decode(&errorDetail)
+	if err != nil {
+		return err
+	}
+
+	errorDetail.StatusCode = resp.StatusCode
+
+	// Check for errors we handle specifically
+	if errorDetail.StatusCode == http.StatusForbidden && errorDetail.Detail == tosAgreementError {
+		return TOSError{errorDetail}
+	}
+
+	return errorDetail
+}
+
+func handleChallengeError(chlng challenge) error {
+	return challengeError{chlng.Error, chlng.ValidationRecords}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/http.go

@@ -0,0 +1,117 @@
+package acme
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"runtime"
+	"strings"
+	"time"
+)
+
+// UserAgent (if non-empty) will be tacked onto the User-Agent string in requests.
+var UserAgent string
+
+// defaultClient is an HTTP client with a reasonable timeout value.
+var defaultClient = http.Client{Timeout: 10 * time.Second}
+
+const (
+	// defaultGoUserAgent is the Go HTTP package user agent string. Too
+	// bad it isn't exported. If it changes, we should update it here, too.
+	defaultGoUserAgent = "Go-http-client/1.1"
+
+	// ourUserAgent is the User-Agent of this underlying library package.
+	ourUserAgent = "xenolf-acme"
+)
+
+// httpHead performs a HEAD request with a proper User-Agent string.
+// The response body (resp.Body) is already closed when this function returns.
+func httpHead(url string) (resp *http.Response, err error) {
+	req, err := http.NewRequest("HEAD", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("User-Agent", userAgent())
+
+	resp, err = defaultClient.Do(req)
+	if err != nil {
+		return resp, err
+	}
+	resp.Body.Close()
+	return resp, err
+}
+
+// httpPost performs a POST request with a proper User-Agent string.
+// Callers should close resp.Body when done reading from it.
+func httpPost(url string, bodyType string, body io.Reader) (resp *http.Response, err error) {
+	req, err := http.NewRequest("POST", url, body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", bodyType)
+	req.Header.Set("User-Agent", userAgent())
+
+	return defaultClient.Do(req)
+}
+
+// httpGet performs a GET request with a proper User-Agent string.
+// Callers should close resp.Body when done reading from it.
+func httpGet(url string) (resp *http.Response, err error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", userAgent())
+
+	return defaultClient.Do(req)
+}
+
+// getJSON performs an HTTP GET request and parses the response body
+// as JSON, into the provided respBody object.
+func getJSON(uri string, respBody interface{}) (http.Header, error) {
+	resp, err := httpGet(uri)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get %q: %v", uri, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= http.StatusBadRequest {
+		return resp.Header, handleHTTPError(resp)
+	}
+
+	return resp.Header, json.NewDecoder(resp.Body).Decode(respBody)
+}
+
+// postJSON performs an HTTP POST request and parses the response body
+// as JSON, into the provided respBody object.
+func postJSON(j *jws, uri string, reqBody, respBody interface{}) (http.Header, error) {
+	jsonBytes, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, errors.New("Failed to marshal network message...")
+	}
+
+	resp, err := j.post(uri, jsonBytes)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to post JWS message. -> %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= http.StatusBadRequest {
+		return resp.Header, handleHTTPError(resp)
+	}
+
+	if respBody == nil {
+		return resp.Header, nil
+	}
+
+	return resp.Header, json.NewDecoder(resp.Body).Decode(respBody)
+}
+
+// userAgent builds and returns the User-Agent string to use in requests.
+func userAgent() string {
+	ua := fmt.Sprintf("%s (%s; %s) %s %s", defaultGoUserAgent, runtime.GOOS, runtime.GOARCH, ourUserAgent, UserAgent)
+	return strings.TrimSpace(ua)
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/http_challenge.go

@@ -0,0 +1,41 @@
+package acme
+
+import (
+	"fmt"
+	"log"
+)
+
+type httpChallenge struct {
+	jws      *jws
+	validate validateFunc
+	provider ChallengeProvider
+}
+
+// HTTP01ChallengePath returns the URL path for the `http-01` challenge
+func HTTP01ChallengePath(token string) string {
+	return "/.well-known/acme-challenge/" + token
+}
+
+func (s *httpChallenge) Solve(chlng challenge, domain string) error {
+
+	logf("[INFO][%s] acme: Trying to solve HTTP-01", domain)
+
+	// Generate the Key Authorization for the challenge
+	keyAuth, err := getKeyAuthorization(chlng.Token, s.jws.privKey)
+	if err != nil {
+		return err
+	}
+
+	err = s.provider.Present(domain, chlng.Token, keyAuth)
+	if err != nil {
+		return fmt.Errorf("[%s] error presenting token: %v", domain, err)
+	}
+	defer func() {
+		err := s.provider.CleanUp(domain, chlng.Token, keyAuth)
+		if err != nil {
+			log.Printf("[%s] error cleaning up: %v", domain, err)
+		}
+	}()
+
+	return s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/http_challenge_server.go

@@ -0,0 +1,79 @@
+package acme
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"strings"
+)
+
+// HTTPProviderServer implements ChallengeProvider for `http-01` challenge
+// It may be instantiated without using the NewHTTPProviderServer function if
+// you want only to use the default values.
+type HTTPProviderServer struct {
+	iface    string
+	port     string
+	done     chan bool
+	listener net.Listener
+}
+
+// NewHTTPProviderServer creates a new HTTPProviderServer on the selected interface and port.
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 80 respectively.
+func NewHTTPProviderServer(iface, port string) *HTTPProviderServer {
+	return &HTTPProviderServer{iface: iface, port: port}
+}
+
+// Present starts a web server and makes the token available at `HTTP01ChallengePath(token)` for web requests.
+func (s *HTTPProviderServer) Present(domain, token, keyAuth string) error {
+	if s.port == "" {
+		s.port = "80"
+	}
+
+	var err error
+	s.listener, err = net.Listen("tcp", net.JoinHostPort(s.iface, s.port))
+	if err != nil {
+		return fmt.Errorf("Could not start HTTP server for challenge -> %v", err)
+	}
+
+	s.done = make(chan bool)
+	go s.serve(domain, token, keyAuth)
+	return nil
+}
+
+// CleanUp closes the HTTP server and removes the token from `HTTP01ChallengePath(token)`
+func (s *HTTPProviderServer) CleanUp(domain, token, keyAuth string) error {
+	if s.listener == nil {
+		return nil
+	}
+	s.listener.Close()
+	<-s.done
+	return nil
+}
+
+func (s *HTTPProviderServer) serve(domain, token, keyAuth string) {
+	path := HTTP01ChallengePath(token)
+
+	// The handler validates the HOST header and request type.
+	// For validation it then writes the token the server returned with the challenge
+	mux := http.NewServeMux()
+	mux.HandleFunc(path, func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasPrefix(r.Host, domain) && r.Method == "GET" {
+			w.Header().Add("Content-Type", "text/plain")
+			w.Write([]byte(keyAuth))
+			logf("[INFO][%s] Served key authentication", domain)
+		} else {
+			logf("[INFO] Received request for domain %s with method %s", r.Host, r.Method)
+			w.Write([]byte("TEST"))
+		}
+	})
+
+	httpServer := &http.Server{
+		Handler: mux,
+	}
+	// Once httpServer is shut down we don't want any lingering
+	// connections, so disable KeepAlives.
+	httpServer.SetKeepAlivesEnabled(false)
+	httpServer.Serve(s.listener)
+	s.done <- true
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/http_challenge_test.go

@@ -0,0 +1,57 @@
+package acme
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"io/ioutil"
+	"strings"
+	"testing"
+)
+
+func TestHTTPChallenge(t *testing.T) {
+	privKey, _ := rsa.GenerateKey(rand.Reader, 512)
+	j := &jws{privKey: privKey}
+	clientChallenge := challenge{Type: HTTP01, Token: "http1"}
+	mockValidate := func(_ *jws, _, _ string, chlng challenge) error {
+		uri := "http://localhost:23457/.well-known/acme-challenge/" + chlng.Token
+		resp, err := httpGet(uri)
+		if err != nil {
+			return err
+		}
+		defer resp.Body.Close()
+
+		if want := "text/plain"; resp.Header.Get("Content-Type") != want {
+			t.Errorf("Get(%q) Content-Type: got %q, want %q", uri, resp.Header.Get("Content-Type"), want)
+		}
+
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return err
+		}
+		bodyStr := string(body)
+
+		if bodyStr != chlng.KeyAuthorization {
+			t.Errorf("Get(%q) Body: got %q, want %q", uri, bodyStr, chlng.KeyAuthorization)
+		}
+
+		return nil
+	}
+	solver := &httpChallenge{jws: j, validate: mockValidate, provider: &HTTPProviderServer{port: "23457"}}
+
+	if err := solver.Solve(clientChallenge, "localhost:23457"); err != nil {
+		t.Errorf("Solve error: got %v, want nil", err)
+	}
+}
+
+func TestHTTPChallengeInvalidPort(t *testing.T) {
+	privKey, _ := rsa.GenerateKey(rand.Reader, 128)
+	j := &jws{privKey: privKey}
+	clientChallenge := challenge{Type: HTTP01, Token: "http2"}
+	solver := &httpChallenge{jws: j, validate: stubValidate, provider: &HTTPProviderServer{port: "123456"}}
+
+	if err := solver.Solve(clientChallenge, "localhost:123456"); err == nil {
+		t.Errorf("Solve error: got %v, want error", err)
+	} else if want := "invalid port 123456"; !strings.HasSuffix(err.Error(), want) {
+		t.Errorf("Solve error: got %q, want suffix %q", err.Error(), want)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/http_test.go

@@ -0,0 +1,100 @@
+package acme
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestHTTPHeadUserAgent(t *testing.T) {
+	var ua, method string
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ua = r.Header.Get("User-Agent")
+		method = r.Method
+	}))
+	defer ts.Close()
+
+	_, err := httpHead(ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if method != "HEAD" {
+		t.Errorf("Expected method to be HEAD, got %s", method)
+	}
+	if !strings.Contains(ua, ourUserAgent) {
+		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
+	}
+}
+
+func TestHTTPGetUserAgent(t *testing.T) {
+	var ua, method string
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ua = r.Header.Get("User-Agent")
+		method = r.Method
+	}))
+	defer ts.Close()
+
+	res, err := httpGet(ts.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	res.Body.Close()
+
+	if method != "GET" {
+		t.Errorf("Expected method to be GET, got %s", method)
+	}
+	if !strings.Contains(ua, ourUserAgent) {
+		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
+	}
+}
+
+func TestHTTPPostUserAgent(t *testing.T) {
+	var ua, method string
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ua = r.Header.Get("User-Agent")
+		method = r.Method
+	}))
+	defer ts.Close()
+
+	res, err := httpPost(ts.URL, "text/plain", strings.NewReader("falalalala"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	res.Body.Close()
+
+	if method != "POST" {
+		t.Errorf("Expected method to be POST, got %s", method)
+	}
+	if !strings.Contains(ua, ourUserAgent) {
+		t.Errorf("Expected User-Agent to contain '%s', got: '%s'", ourUserAgent, ua)
+	}
+}
+
+func TestUserAgent(t *testing.T) {
+	ua := userAgent()
+
+	if !strings.Contains(ua, defaultGoUserAgent) {
+		t.Errorf("Expected UA to contain %s, got '%s'", defaultGoUserAgent, ua)
+	}
+	if !strings.Contains(ua, ourUserAgent) {
+		t.Errorf("Expected UA to contain %s, got '%s'", ourUserAgent, ua)
+	}
+	if strings.HasSuffix(ua, " ") {
+		t.Errorf("UA should not have trailing spaces; got '%s'", ua)
+	}
+
+	// customize the UA by appending a value
+	UserAgent = "MyApp/1.2.3"
+	ua = userAgent()
+	if !strings.Contains(ua, defaultGoUserAgent) {
+		t.Errorf("Expected UA to contain %s, got '%s'", defaultGoUserAgent, ua)
+	}
+	if !strings.Contains(ua, ourUserAgent) {
+		t.Errorf("Expected UA to contain %s, got '%s'", ourUserAgent, ua)
+	}
+	if !strings.Contains(ua, UserAgent) {
+		t.Errorf("Expected custom UA to contain %s, got '%s'", UserAgent, ua)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/jws.go

@@ -0,0 +1,107 @@
+package acme
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"fmt"
+	"net/http"
+
+	"gopkg.in/square/go-jose.v1"
+)
+
+type jws struct {
+	directoryURL string
+	privKey      crypto.PrivateKey
+	nonces       []string
+}
+
+func keyAsJWK(key interface{}) *jose.JsonWebKey {
+	switch k := key.(type) {
+	case *ecdsa.PublicKey:
+		return &jose.JsonWebKey{Key: k, Algorithm: "EC"}
+	case *rsa.PublicKey:
+		return &jose.JsonWebKey{Key: k, Algorithm: "RSA"}
+
+	default:
+		return nil
+	}
+}
+
+// Posts a JWS signed message to the specified URL
+func (j *jws) post(url string, content []byte) (*http.Response, error) {
+	signedContent, err := j.signContent(content)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
+	if err != nil {
+		return nil, err
+	}
+
+	j.getNonceFromResponse(resp)
+
+	return resp, err
+}
+
+func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
+
+	var alg jose.SignatureAlgorithm
+	switch k := j.privKey.(type) {
+	case *rsa.PrivateKey:
+		alg = jose.RS256
+	case *ecdsa.PrivateKey:
+		if k.Curve == elliptic.P256() {
+			alg = jose.ES256
+		} else if k.Curve == elliptic.P384() {
+			alg = jose.ES384
+		}
+	}
+
+	signer, err := jose.NewSigner(alg, j.privKey)
+	if err != nil {
+		return nil, err
+	}
+	signer.SetNonceSource(j)
+
+	signed, err := signer.Sign(content)
+	if err != nil {
+		return nil, err
+	}
+	return signed, nil
+}
+
+func (j *jws) getNonceFromResponse(resp *http.Response) error {
+	nonce := resp.Header.Get("Replay-Nonce")
+	if nonce == "" {
+		return fmt.Errorf("Server did not respond with a proper nonce header.")
+	}
+
+	j.nonces = append(j.nonces, nonce)
+	return nil
+}
+
+func (j *jws) getNonce() error {
+	resp, err := httpHead(j.directoryURL)
+	if err != nil {
+		return err
+	}
+
+	return j.getNonceFromResponse(resp)
+}
+
+func (j *jws) Nonce() (string, error) {
+	nonce := ""
+	if len(j.nonces) == 0 {
+		err := j.getNonce()
+		if err != nil {
+			return nonce, err
+		}
+	}
+
+	nonce, j.nonces = j.nonces[len(j.nonces)-1], j.nonces[:len(j.nonces)-1]
+	return nonce, nil
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/messages.go

@@ -0,0 +1,115 @@
+package acme
+
+import (
+	"time"
+
+	"gopkg.in/square/go-jose.v1"
+)
+
+type directory struct {
+	NewAuthzURL   string `json:"new-authz"`
+	NewCertURL    string `json:"new-cert"`
+	NewRegURL     string `json:"new-reg"`
+	RevokeCertURL string `json:"revoke-cert"`
+}
+
+type recoveryKeyMessage struct {
+	Length int             `json:"length,omitempty"`
+	Client jose.JsonWebKey `json:"client,omitempty"`
+	Server jose.JsonWebKey `json:"client,omitempty"`
+}
+
+type registrationMessage struct {
+	Resource string   `json:"resource"`
+	Contact  []string `json:"contact"`
+	//	RecoveryKey recoveryKeyMessage `json:"recoveryKey,omitempty"`
+}
+
+// Registration is returned by the ACME server after the registration
+// The client implementation should save this registration somewhere.
+type Registration struct {
+	Resource       string          `json:"resource,omitempty"`
+	ID             int             `json:"id"`
+	Key            jose.JsonWebKey `json:"key"`
+	Contact        []string        `json:"contact"`
+	Agreement      string          `json:"agreement,omitempty"`
+	Authorizations string          `json:"authorizations,omitempty"`
+	Certificates   string          `json:"certificates,omitempty"`
+	//	RecoveryKey    recoveryKeyMessage `json:"recoveryKey,omitempty"`
+}
+
+// RegistrationResource represents all important informations about a registration
+// of which the client needs to keep track itself.
+type RegistrationResource struct {
+	Body        Registration `json:"body,omitempty"`
+	URI         string       `json:"uri,omitempty"`
+	NewAuthzURL string       `json:"new_authzr_uri,omitempty"`
+	TosURL      string       `json:"terms_of_service,omitempty"`
+}
+
+type authorizationResource struct {
+	Body       authorization
+	Domain     string
+	NewCertURL string
+	AuthURL    string
+}
+
+type authorization struct {
+	Resource     string      `json:"resource,omitempty"`
+	Identifier   identifier  `json:"identifier"`
+	Status       string      `json:"status,omitempty"`
+	Expires      time.Time   `json:"expires,omitempty"`
+	Challenges   []challenge `json:"challenges,omitempty"`
+	Combinations [][]int     `json:"combinations,omitempty"`
+}
+
+type identifier struct {
+	Type  string `json:"type"`
+	Value string `json:"value"`
+}
+
+type validationRecord struct {
+	URI               string   `json:"url,omitempty"`
+	Hostname          string   `json:"hostname,omitempty"`
+	Port              string   `json:"port,omitempty"`
+	ResolvedAddresses []string `json:"addressesResolved,omitempty"`
+	UsedAddress       string   `json:"addressUsed,omitempty"`
+}
+
+type challenge struct {
+	Resource          string             `json:"resource,omitempty"`
+	Type              Challenge          `json:"type,omitempty"`
+	Status            string             `json:"status,omitempty"`
+	URI               string             `json:"uri,omitempty"`
+	Token             string             `json:"token,omitempty"`
+	KeyAuthorization  string             `json:"keyAuthorization,omitempty"`
+	TLS               bool               `json:"tls,omitempty"`
+	Iterations        int                `json:"n,omitempty"`
+	Error             RemoteError        `json:"error,omitempty"`
+	ValidationRecords []validationRecord `json:"validationRecord,omitempty"`
+}
+
+type csrMessage struct {
+	Resource       string   `json:"resource,omitempty"`
+	Csr            string   `json:"csr"`
+	Authorizations []string `json:"authorizations"`
+}
+
+type revokeCertMessage struct {
+	Resource    string `json:"resource"`
+	Certificate string `json:"certificate"`
+}
+
+// CertificateResource represents a CA issued certificate.
+// PrivateKey and Certificate are both already PEM encoded
+// and can be directly written to disk. Certificate may
+// be a certificate bundle, depending on the options supplied
+// to create it.
+type CertificateResource struct {
+	Domain        string `json:"domain"`
+	CertURL       string `json:"certUrl"`
+	CertStableURL string `json:"certStableUrl"`
+	AccountRef    string `json:"accountRef,omitempty"`
+	PrivateKey    []byte `json:"-"`
+	Certificate   []byte `json:"-"`
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/provider.go

@@ -0,0 +1,28 @@
+package acme
+
+import "time"
+
+// ChallengeProvider enables implementing a custom challenge
+// provider. Present presents the solution to a challenge available to
+// be solved. CleanUp will be called by the challenge if Present ends
+// in a non-error state.
+type ChallengeProvider interface {
+	Present(domain, token, keyAuth string) error
+	CleanUp(domain, token, keyAuth string) error
+}
+
+// ChallengeProviderTimeout allows for implementing a
+// ChallengeProvider where an unusually long timeout is required when
+// waiting for an ACME challenge to be satisfied, such as when
+// checking for DNS record progagation. If an implementor of a
+// ChallengeProvider provides a Timeout method, then the return values
+// of the Timeout method will be used when appropriate by the acme
+// package. The interval value is the time between checks.
+//
+// The default values used for timeout and interval are 60 seconds and
+// 2 seconds respectively. These are used when no Timeout method is
+// defined for the ChallengeProvider.
+type ChallengeProviderTimeout interface {
+	ChallengeProvider
+	Timeout() (timeout, interval time.Duration)
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/tls_sni_challenge.go

@@ -0,0 +1,73 @@
+package acme
+
+import (
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/tls"
+	"encoding/hex"
+	"fmt"
+	"log"
+)
+
+type tlsSNIChallenge struct {
+	jws      *jws
+	validate validateFunc
+	provider ChallengeProvider
+}
+
+func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
+	// FIXME: https://github.com/ietf-wg-acme/acme/pull/22
+	// Currently we implement this challenge to track boulder, not the current spec!
+
+	logf("[INFO][%s] acme: Trying to solve TLS-SNI-01", domain)
+
+	// Generate the Key Authorization for the challenge
+	keyAuth, err := getKeyAuthorization(chlng.Token, t.jws.privKey)
+	if err != nil {
+		return err
+	}
+
+	err = t.provider.Present(domain, chlng.Token, keyAuth)
+	if err != nil {
+		return fmt.Errorf("[%s] error presenting token: %v", domain, err)
+	}
+	defer func() {
+		err := t.provider.CleanUp(domain, chlng.Token, keyAuth)
+		if err != nil {
+			log.Printf("[%s] error cleaning up: %v", domain, err)
+		}
+	}()
+	return t.validate(t.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
+}
+
+// TLSSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
+func TLSSNI01ChallengeCertDomain(keyAuth string) (tls.Certificate, string, error) {
+	// generate a new RSA key for the certificates
+	tempPrivKey, err := generatePrivateKey(RSA2048)
+	if err != nil {
+		return tls.Certificate{}, "", err
+	}
+	rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
+	rsaPrivPEM := pemEncode(rsaPrivKey)
+
+	zBytes := sha256.Sum256([]byte(keyAuth))
+	z := hex.EncodeToString(zBytes[:sha256.Size])
+	domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
+	tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
+	if err != nil {
+		return tls.Certificate{}, "", err
+	}
+
+	certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
+	if err != nil {
+		return tls.Certificate{}, "", err
+	}
+
+	return certificate, domain, nil
+}
+
+// TLSSNI01ChallengeCert returns a certificate for the `tls-sni-01` challenge
+func TLSSNI01ChallengeCert(keyAuth string) (tls.Certificate, error) {
+	cert, _, err := TLSSNI01ChallengeCertDomain(keyAuth)
+	return cert, err
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/tls_sni_challenge_server.go

@@ -0,0 +1,62 @@
+package acme
+
+import (
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/http"
+)
+
+// TLSProviderServer implements ChallengeProvider for `TLS-SNI-01` challenge
+// It may be instantiated without using the NewTLSProviderServer function if
+// you want only to use the default values.
+type TLSProviderServer struct {
+	iface    string
+	port     string
+	done     chan bool
+	listener net.Listener
+}
+
+// NewTLSProviderServer creates a new TLSProviderServer on the selected interface and port.
+// Setting iface and / or port to an empty string will make the server fall back to
+// the "any" interface and port 443 respectively.
+func NewTLSProviderServer(iface, port string) *TLSProviderServer {
+	return &TLSProviderServer{iface: iface, port: port}
+}
+
+// Present makes the keyAuth available as a cert
+func (s *TLSProviderServer) Present(domain, token, keyAuth string) error {
+	if s.port == "" {
+		s.port = "443"
+	}
+
+	cert, err := TLSSNI01ChallengeCert(keyAuth)
+	if err != nil {
+		return err
+	}
+
+	tlsConf := new(tls.Config)
+	tlsConf.Certificates = []tls.Certificate{cert}
+
+	s.listener, err = tls.Listen("tcp", net.JoinHostPort(s.iface, s.port), tlsConf)
+	if err != nil {
+		return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
+	}
+
+	s.done = make(chan bool)
+	go func() {
+		http.Serve(s.listener, nil)
+		s.done <- true
+	}()
+	return nil
+}
+
+// CleanUp closes the HTTP server.
+func (s *TLSProviderServer) CleanUp(domain, token, keyAuth string) error {
+	if s.listener == nil {
+		return nil
+	}
+	s.listener.Close()
+	<-s.done
+	return nil
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/tls_sni_challenge_test.go

@@ -0,0 +1,65 @@
+package acme
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/tls"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestTLSSNIChallenge(t *testing.T) {
+	privKey, _ := rsa.GenerateKey(rand.Reader, 512)
+	j := &jws{privKey: privKey}
+	clientChallenge := challenge{Type: TLSSNI01, Token: "tlssni1"}
+	mockValidate := func(_ *jws, _, _ string, chlng challenge) error {
+		conn, err := tls.Dial("tcp", "localhost:23457", &tls.Config{
+			InsecureSkipVerify: true,
+		})
+		if err != nil {
+			t.Errorf("Expected to connect to challenge server without an error. %s", err.Error())
+		}
+
+		// Expect the server to only return one certificate
+		connState := conn.ConnectionState()
+		if count := len(connState.PeerCertificates); count != 1 {
+			t.Errorf("Expected the challenge server to return exactly one certificate but got %d", count)
+		}
+
+		remoteCert := connState.PeerCertificates[0]
+		if count := len(remoteCert.DNSNames); count != 1 {
+			t.Errorf("Expected the challenge certificate to have exactly one DNSNames entry but had %d", count)
+		}
+
+		zBytes := sha256.Sum256([]byte(chlng.KeyAuthorization))
+		z := hex.EncodeToString(zBytes[:sha256.Size])
+		domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
+
+		if remoteCert.DNSNames[0] != domain {
+			t.Errorf("Expected the challenge certificate DNSName to match %s but was %s", domain, remoteCert.DNSNames[0])
+		}
+
+		return nil
+	}
+	solver := &tlsSNIChallenge{jws: j, validate: mockValidate, provider: &TLSProviderServer{port: "23457"}}
+
+	if err := solver.Solve(clientChallenge, "localhost:23457"); err != nil {
+		t.Errorf("Solve error: got %v, want nil", err)
+	}
+}
+
+func TestTLSSNIChallengeInvalidPort(t *testing.T) {
+	privKey, _ := rsa.GenerateKey(rand.Reader, 128)
+	j := &jws{privKey: privKey}
+	clientChallenge := challenge{Type: TLSSNI01, Token: "tlssni2"}
+	solver := &tlsSNIChallenge{jws: j, validate: stubValidate, provider: &TLSProviderServer{port: "123456"}}
+
+	if err := solver.Solve(clientChallenge, "localhost:123456"); err == nil {
+		t.Errorf("Solve error: got %v, want error", err)
+	} else if want := "invalid port 123456"; !strings.HasSuffix(err.Error(), want) {
+		t.Errorf("Solve error: got %q, want suffix %q", err.Error(), want)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/utils.go

@@ -0,0 +1,29 @@
+package acme
+
+import (
+	"fmt"
+	"time"
+)
+
+// WaitFor polls the given function 'f', once every 'interval', up to 'timeout'.
+func WaitFor(timeout, interval time.Duration, f func() (bool, error)) error {
+	var lastErr string
+	timeup := time.After(timeout)
+	for {
+		select {
+		case <-timeup:
+			return fmt.Errorf("Time limit exceeded. Last error: %s", lastErr)
+		default:
+		}
+
+		stop, err := f()
+		if stop {
+			return nil
+		}
+		if err != nil {
+			lastErr = err.Error()
+		}
+
+		time.Sleep(interval)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/github.com/xenolf/lego/acme/utils_test.go

@@ -0,0 +1,26 @@
+package acme
+
+import (
+	"testing"
+	"time"
+)
+
+func TestWaitForTimeout(t *testing.T) {
+	c := make(chan error)
+	go func() {
+		err := WaitFor(3*time.Second, 1*time.Second, func() (bool, error) {
+			return false, nil
+		})
+		c <- err
+	}()
+
+	timeout := time.After(4 * time.Second)
+	select {
+	case <-timeout:
+		t.Fatal("timeout exceeded")
+	case err := <-c:
+		if err == nil {
+			t.Errorf("expected timeout error; got %v", err)
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/BUG-BOUNTY.md

@@ -0,0 +1,10 @@
+Serious about security
+======================
+
+Square recognizes the important contributions the security research community
+can make. We therefore encourage reporting security issues with the code
+contained in this repository.
+
+If you believe you have discovered a security vulnerability, please follow the
+guidelines at <https://hackerone.com/square-open-source>.
+

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/CONTRIBUTING.md

@@ -0,0 +1,14 @@
+# Contributing
+
+If you would like to contribute code to go-jose you can do so through GitHub by
+forking the repository and sending a pull request.
+
+When submitting code, please make every effort to follow existing conventions
+and style in order to keep the code as readable as possible. Please also make
+sure all tests pass by running `go test`, and format your code with `go fmt`.
+We also recommend using `golint` and `errcheck`.
+
+Before your code can be accepted into the project you must also sign the
+[Individual Contributor License Agreement][1].
+
+ [1]: https://spreadsheets.google.com/spreadsheet/viewform?formkey=dDViT2xzUHAwRkI3X3k5Z0lQM091OGc6MQ&ndplr=1

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
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+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
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+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
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+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
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+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
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+      origin of the Work and reproducing the content of the NOTICE file.
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+      whether in tort (including negligence), contract, or otherwise,
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+      negligent acts) or agreed to in writing, shall any Contributor be
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+
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+   You may obtain a copy of the License at
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+       http://www.apache.org/licenses/LICENSE-2.0
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+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/README.md

@@ -0,0 +1,209 @@
+# Go JOSE 
+
+[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/gopkg.in/square/go-jose.v1) [![license](http://img.shields.io/badge/license-apache_2.0-red.svg?style=flat)](https://raw.githubusercontent.com/square/go-jose/master/LICENSE) [![build](https://travis-ci.org/square/go-jose.svg?branch=master)](https://travis-ci.org/square/go-jose) [![coverage](https://coveralls.io/repos/github/square/go-jose/badge.svg?branch=master)](https://coveralls.io/r/square/go-jose)
+
+Package jose aims to provide an implementation of the Javascript Object Signing
+and Encryption set of standards. For the moment, it mainly focuses on encryption
+and signing based on the JSON Web Encryption and JSON Web Signature standards.
+
+**Disclaimer**: This library contains encryption software that is subject to
+the U.S. Export Administration Regulations. You may not export, re-export,
+transfer or download this code or any part of it in violation of any United
+States law, directive or regulation. In particular this software may not be
+exported or re-exported in any form or on any media to Iran, North Sudan,
+Syria, Cuba, or North Korea, or to denied persons or entities mentioned on any
+US maintained blocked list.
+
+## Overview
+
+The implementation follows the
+[JSON Web Encryption](http://dx.doi.org/10.17487/RFC7516)
+standard (RFC 7516) and
+[JSON Web Signature](http://dx.doi.org/10.17487/RFC7515)
+standard (RFC 7515). Tables of supported algorithms are shown below.
+The library supports both the compact and full serialization formats, and has
+optional support for multiple recipients. It also comes with a small
+command-line utility
+([`jose-util`](https://github.com/square/go-jose/tree/master/jose-util))
+for dealing with JOSE messages in a shell.
+
+**Note**: We use a forked version of the `encoding/json` package from the Go
+standard library which uses case-sensitive matching for member names (instead
+of [case-insensitive matching](https://www.ietf.org/mail-archive/web/json/current/msg03763.html)).
+This is to avoid differences in interpretation of messages between go-jose and
+libraries in other languages. If you do not like this behavior, you can use the
+`std_json` build tag to disable it (though we do not recommend doing so).
+
+### Versions
+
+We use [gopkg.in](https://gopkg.in) for versioning.
+
+[Version 1](https://gopkg.in/square/go-jose.v1) is the current stable version:
+
+    import "gopkg.in/square/go-jose.v1"
+
+The interface for [go-jose.v1](https://gopkg.in/square/go-jose.v1) will remain
+backwards compatible. We're currently sketching out ideas for a new version, to
+clean up the interface a bit. If you have ideas or feature requests [please let
+us know](https://github.com/square/go-jose/issues/64)!
+
+### Supported algorithms
+
+See below for a table of supported algorithms. Algorithm identifiers match
+the names in the
+[JSON Web Algorithms](http://dx.doi.org/10.17487/RFC7518)
+standard where possible. The
+[Godoc reference](https://godoc.org/github.com/square/go-jose#pkg-constants)
+has a list of constants.
+
+ Key encryption             | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ RSA-PKCS#1v1.5             | RSA1_5
+ RSA-OAEP                   | RSA-OAEP, RSA-OAEP-256
+ AES key wrap               | A128KW, A192KW, A256KW
+ AES-GCM key wrap           | A128GCMKW, A192GCMKW, A256GCMKW
+ ECDH-ES + AES key wrap     | ECDH-ES+A128KW, ECDH-ES+A192KW, ECDH-ES+A256KW
+ ECDH-ES (direct)           | ECDH-ES<sup>1</sup>
+ Direct encryption          | dir<sup>1</sup>
+
+<sup>1. Not supported in multi-recipient mode</sup>
+
+ Signing / MAC              | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ RSASSA-PKCS#1v1.5          | RS256, RS384, RS512
+ RSASSA-PSS                 | PS256, PS384, PS512
+ HMAC                       | HS256, HS384, HS512
+ ECDSA                      | ES256, ES384, ES512
+
+ Content encryption         | Algorithm identifier(s)
+ :------------------------- | :------------------------------
+ AES-CBC+HMAC               | A128CBC-HS256, A192CBC-HS384, A256CBC-HS512
+ AES-GCM                    | A128GCM, A192GCM, A256GCM 
+
+ Compression                | Algorithm identifiers(s)
+ :------------------------- | -------------------------------
+ DEFLATE (RFC 1951)         | DEF
+
+### Supported key types
+
+See below for a table of supported key types. These are understood by the
+library, and can be passed to corresponding functions such as `NewEncrypter` or
+`NewSigner`. Note that if you are creating a new encrypter or signer with a
+JsonWebKey, the key id of the JsonWebKey (if present) will be added to any
+resulting messages.
+
+ Algorithm(s)               | Corresponding types
+ :------------------------- | -------------------------------
+ RSA                        | *[rsa.PublicKey](http://golang.org/pkg/crypto/rsa/#PublicKey), *[rsa.PrivateKey](http://golang.org/pkg/crypto/rsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
+ ECDH, ECDSA                | *[ecdsa.PublicKey](http://golang.org/pkg/crypto/ecdsa/#PublicKey), *[ecdsa.PrivateKey](http://golang.org/pkg/crypto/ecdsa/#PrivateKey), *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
+ AES, HMAC                  | []byte, *[jose.JsonWebKey](https://godoc.org/github.com/square/go-jose#JsonWebKey)
+
+## Examples
+
+Encryption/decryption example using RSA:
+
+```Go
+// Generate a public/private key pair to use for this example. The library
+// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
+// that can be used to load keys from PEM/DER-encoded data.
+privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+if err != nil {
+	panic(err)
+}
+
+// Instantiate an encrypter using RSA-OAEP with AES128-GCM. An error would
+// indicate that the selected algorithm(s) are not currently supported.
+publicKey := &privateKey.PublicKey
+encrypter, err := NewEncrypter(RSA_OAEP, A128GCM, publicKey)
+if err != nil {
+	panic(err)
+}
+
+// Encrypt a sample plaintext. Calling the encrypter returns an encrypted
+// JWE object, which can then be serialized for output afterwards. An error
+// would indicate a problem in an underlying cryptographic primitive.
+var plaintext = []byte("Lorem ipsum dolor sit amet")
+object, err := encrypter.Encrypt(plaintext)
+if err != nil {
+	panic(err)
+}
+
+// Serialize the encrypted object using the full serialization format.
+// Alternatively you can also use the compact format here by calling
+// object.CompactSerialize() instead.
+serialized := object.FullSerialize()
+
+// Parse the serialized, encrypted JWE object. An error would indicate that
+// the given input did not represent a valid message.
+object, err = ParseEncrypted(serialized)
+if err != nil {
+	panic(err)
+}
+
+// Now we can decrypt and get back our original plaintext. An error here
+// would indicate the the message failed to decrypt, e.g. because the auth
+// tag was broken or the message was tampered with.
+decrypted, err := object.Decrypt(privateKey)
+if err != nil {
+	panic(err)
+}
+
+fmt.Printf(string(decrypted))
+// output: Lorem ipsum dolor sit amet
+```
+
+Signing/verification example using RSA:
+
+```Go
+// Generate a public/private key pair to use for this example. The library
+// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
+// that can be used to load keys from PEM/DER-encoded data.
+privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+if err != nil {
+	panic(err)
+}
+
+// Instantiate a signer using RSASSA-PSS (SHA512) with the given private key.
+signer, err := NewSigner(PS512, privateKey)
+if err != nil {
+	panic(err)
+}
+
+// Sign a sample payload. Calling the signer returns a protected JWS object,
+// which can then be serialized for output afterwards. An error would
+// indicate a problem in an underlying cryptographic primitive.
+var payload = []byte("Lorem ipsum dolor sit amet")
+object, err := signer.Sign(payload)
+if err != nil {
+	panic(err)
+}
+
+// Serialize the encrypted object using the full serialization format.
+// Alternatively you can also use the compact format here by calling
+// object.CompactSerialize() instead.
+serialized := object.FullSerialize()
+
+// Parse the serialized, protected JWS object. An error would indicate that
+// the given input did not represent a valid message.
+object, err = ParseSigned(serialized)
+if err != nil {
+	panic(err)
+}
+
+// Now we can verify the signature on the payload. An error here would
+// indicate the the message failed to verify, e.g. because the signature was
+// broken or the message was tampered with.
+output, err := object.Verify(&privateKey.PublicKey)
+if err != nil {
+	panic(err)
+}
+
+fmt.Printf(string(output))
+// output: Lorem ipsum dolor sit amet
+```
+
+More examples can be found in the [Godoc
+reference](https://godoc.org/github.com/square/go-jose) for this package. The
+[`jose-util`](https://github.com/square/go-jose/tree/master/jose-util)
+subdirectory also contains a small command-line utility which might
+be useful as an example.

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/asymmetric.go

@@ -0,0 +1,498 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto"
+	"crypto/aes"
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha1"
+	"crypto/sha256"
+	"errors"
+	"fmt"
+	"math/big"
+
+	"gopkg.in/square/go-jose.v1/cipher"
+)
+
+// A generic RSA-based encrypter/verifier
+type rsaEncrypterVerifier struct {
+	publicKey *rsa.PublicKey
+}
+
+// A generic RSA-based decrypter/signer
+type rsaDecrypterSigner struct {
+	privateKey *rsa.PrivateKey
+}
+
+// A generic EC-based encrypter/verifier
+type ecEncrypterVerifier struct {
+	publicKey *ecdsa.PublicKey
+}
+
+// A key generator for ECDH-ES
+type ecKeyGenerator struct {
+	size      int
+	algID     string
+	publicKey *ecdsa.PublicKey
+}
+
+// A generic EC-based decrypter/signer
+type ecDecrypterSigner struct {
+	privateKey *ecdsa.PrivateKey
+}
+
+// newRSARecipient creates recipientKeyInfo based on the given key.
+func newRSARecipient(keyAlg KeyAlgorithm, publicKey *rsa.PublicKey) (recipientKeyInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch keyAlg {
+	case RSA1_5, RSA_OAEP, RSA_OAEP_256:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &rsaEncrypterVerifier{
+			publicKey: publicKey,
+		},
+	}, nil
+}
+
+// newRSASigner creates a recipientSigInfo based on the given key.
+func newRSASigner(sigAlg SignatureAlgorithm, privateKey *rsa.PrivateKey) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case RS256, RS384, RS512, PS256, PS384, PS512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: &JsonWebKey{
+			Key: &privateKey.PublicKey,
+		},
+		signer: &rsaDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
+// newECDHRecipient creates recipientKeyInfo based on the given key.
+func newECDHRecipient(keyAlg KeyAlgorithm, publicKey *ecdsa.PublicKey) (recipientKeyInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch keyAlg {
+	case ECDH_ES, ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &ecEncrypterVerifier{
+			publicKey: publicKey,
+		},
+	}, nil
+}
+
+// newECDSASigner creates a recipientSigInfo based on the given key.
+func newECDSASigner(sigAlg SignatureAlgorithm, privateKey *ecdsa.PrivateKey) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case ES256, ES384, ES512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: &JsonWebKey{
+			Key: &privateKey.PublicKey,
+		},
+		signer: &ecDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
+// Encrypt the given payload and update the object.
+func (ctx rsaEncrypterVerifier) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	encryptedKey, err := ctx.encrypt(cek, alg)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	return recipientInfo{
+		encryptedKey: encryptedKey,
+		header:       &rawHeader{},
+	}, nil
+}
+
+// Encrypt the given payload. Based on the key encryption algorithm,
+// this will either use RSA-PKCS1v1.5 or RSA-OAEP (with SHA-1 or SHA-256).
+func (ctx rsaEncrypterVerifier) encrypt(cek []byte, alg KeyAlgorithm) ([]byte, error) {
+	switch alg {
+	case RSA1_5:
+		return rsa.EncryptPKCS1v15(randReader, ctx.publicKey, cek)
+	case RSA_OAEP:
+		return rsa.EncryptOAEP(sha1.New(), randReader, ctx.publicKey, cek, []byte{})
+	case RSA_OAEP_256:
+		return rsa.EncryptOAEP(sha256.New(), randReader, ctx.publicKey, cek, []byte{})
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Decrypt the given payload and return the content encryption key.
+func (ctx rsaDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	return ctx.decrypt(recipient.encryptedKey, KeyAlgorithm(headers.Alg), generator)
+}
+
+// Decrypt the given payload. Based on the key encryption algorithm,
+// this will either use RSA-PKCS1v1.5 or RSA-OAEP (with SHA-1 or SHA-256).
+func (ctx rsaDecrypterSigner) decrypt(jek []byte, alg KeyAlgorithm, generator keyGenerator) ([]byte, error) {
+	// Note: The random reader on decrypt operations is only used for blinding,
+	// so stubbing is meanlingless (hence the direct use of rand.Reader).
+	switch alg {
+	case RSA1_5:
+		defer func() {
+			// DecryptPKCS1v15SessionKey sometimes panics on an invalid payload
+			// because of an index out of bounds error, which we want to ignore.
+			// This has been fixed in Go 1.3.1 (released 2014/08/13), the recover()
+			// only exists for preventing crashes with unpatched versions.
+			// See: https://groups.google.com/forum/#!topic/golang-dev/7ihX6Y6kx9k
+			// See: https://code.google.com/p/go/source/detail?r=58ee390ff31602edb66af41ed10901ec95904d33
+			_ = recover()
+		}()
+
+		// Perform some input validation.
+		keyBytes := ctx.privateKey.PublicKey.N.BitLen() / 8
+		if keyBytes != len(jek) {
+			// Input size is incorrect, the encrypted payload should always match
+			// the size of the public modulus (e.g. using a 2048 bit key will
+			// produce 256 bytes of output). Reject this since it's invalid input.
+			return nil, ErrCryptoFailure
+		}
+
+		cek, _, err := generator.genKey()
+		if err != nil {
+			return nil, ErrCryptoFailure
+		}
+
+		// When decrypting an RSA-PKCS1v1.5 payload, we must take precautions to
+		// prevent chosen-ciphertext attacks as described in RFC 3218, "Preventing
+		// the Million Message Attack on Cryptographic Message Syntax". We are
+		// therefore deliberatly ignoring errors here.
+		_ = rsa.DecryptPKCS1v15SessionKey(rand.Reader, ctx.privateKey, jek, cek)
+
+		return cek, nil
+	case RSA_OAEP:
+		// Use rand.Reader for RSA blinding
+		return rsa.DecryptOAEP(sha1.New(), rand.Reader, ctx.privateKey, jek, []byte{})
+	case RSA_OAEP_256:
+		// Use rand.Reader for RSA blinding
+		return rsa.DecryptOAEP(sha256.New(), rand.Reader, ctx.privateKey, jek, []byte{})
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Sign the given payload
+func (ctx rsaDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	var hash crypto.Hash
+
+	switch alg {
+	case RS256, PS256:
+		hash = crypto.SHA256
+	case RS384, PS384:
+		hash = crypto.SHA384
+	case RS512, PS512:
+		hash = crypto.SHA512
+	default:
+		return Signature{}, ErrUnsupportedAlgorithm
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	var out []byte
+	var err error
+
+	switch alg {
+	case RS256, RS384, RS512:
+		out, err = rsa.SignPKCS1v15(randReader, ctx.privateKey, hash, hashed)
+	case PS256, PS384, PS512:
+		out, err = rsa.SignPSS(randReader, ctx.privateKey, hash, hashed, &rsa.PSSOptions{
+			SaltLength: rsa.PSSSaltLengthAuto,
+		})
+	}
+
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx rsaEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	var hash crypto.Hash
+
+	switch alg {
+	case RS256, PS256:
+		hash = crypto.SHA256
+	case RS384, PS384:
+		hash = crypto.SHA384
+	case RS512, PS512:
+		hash = crypto.SHA512
+	default:
+		return ErrUnsupportedAlgorithm
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	switch alg {
+	case RS256, RS384, RS512:
+		return rsa.VerifyPKCS1v15(ctx.publicKey, hash, hashed, signature)
+	case PS256, PS384, PS512:
+		return rsa.VerifyPSS(ctx.publicKey, hash, hashed, signature, nil)
+	}
+
+	return ErrUnsupportedAlgorithm
+}
+
+// Encrypt the given payload and update the object.
+func (ctx ecEncrypterVerifier) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	switch alg {
+	case ECDH_ES:
+		// ECDH-ES mode doesn't wrap a key, the shared secret is used directly as the key.
+		return recipientInfo{
+			header: &rawHeader{},
+		}, nil
+	case ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW:
+	default:
+		return recipientInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	generator := ecKeyGenerator{
+		algID:     string(alg),
+		publicKey: ctx.publicKey,
+	}
+
+	switch alg {
+	case ECDH_ES_A128KW:
+		generator.size = 16
+	case ECDH_ES_A192KW:
+		generator.size = 24
+	case ECDH_ES_A256KW:
+		generator.size = 32
+	}
+
+	kek, header, err := generator.genKey()
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	block, err := aes.NewCipher(kek)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	jek, err := josecipher.KeyWrap(block, cek)
+	if err != nil {
+		return recipientInfo{}, err
+	}
+
+	return recipientInfo{
+		encryptedKey: jek,
+		header:       &header,
+	}, nil
+}
+
+// Get key size for EC key generator
+func (ctx ecKeyGenerator) keySize() int {
+	return ctx.size
+}
+
+// Get a content encryption key for ECDH-ES
+func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	priv, err := ecdsa.GenerateKey(ctx.publicKey.Curve, randReader)
+	if err != nil {
+		return nil, rawHeader{}, err
+	}
+
+	out := josecipher.DeriveECDHES(ctx.algID, []byte{}, []byte{}, priv, ctx.publicKey, ctx.size)
+
+	headers := rawHeader{
+		Epk: &JsonWebKey{
+			Key: &priv.PublicKey,
+		},
+	}
+
+	return out, headers, nil
+}
+
+// Decrypt the given payload and return the content encryption key.
+func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	if headers.Epk == nil {
+		return nil, errors.New("square/go-jose: missing epk header")
+	}
+
+	publicKey, ok := headers.Epk.Key.(*ecdsa.PublicKey)
+	if publicKey == nil || !ok {
+		return nil, errors.New("square/go-jose: invalid epk header")
+	}
+
+	apuData := headers.Apu.bytes()
+	apvData := headers.Apv.bytes()
+
+	deriveKey := func(algID string, size int) []byte {
+		return josecipher.DeriveECDHES(algID, apuData, apvData, ctx.privateKey, publicKey, size)
+	}
+
+	var keySize int
+
+	switch KeyAlgorithm(headers.Alg) {
+	case ECDH_ES:
+		// ECDH-ES uses direct key agreement, no key unwrapping necessary.
+		return deriveKey(string(headers.Enc), generator.keySize()), nil
+	case ECDH_ES_A128KW:
+		keySize = 16
+	case ECDH_ES_A192KW:
+		keySize = 24
+	case ECDH_ES_A256KW:
+		keySize = 32
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	key := deriveKey(headers.Alg, keySize)
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	return josecipher.KeyUnwrap(block, recipient.encryptedKey)
+}
+
+// Sign the given payload
+func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	var expectedBitSize int
+	var hash crypto.Hash
+
+	switch alg {
+	case ES256:
+		expectedBitSize = 256
+		hash = crypto.SHA256
+	case ES384:
+		expectedBitSize = 384
+		hash = crypto.SHA384
+	case ES512:
+		expectedBitSize = 521
+		hash = crypto.SHA512
+	}
+
+	curveBits := ctx.privateKey.Curve.Params().BitSize
+	if expectedBitSize != curveBits {
+		return Signature{}, fmt.Errorf("square/go-jose: expected %d bit key, got %d bits instead", expectedBitSize, curveBits)
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	r, s, err := ecdsa.Sign(randReader, ctx.privateKey, hashed)
+	if err != nil {
+		return Signature{}, err
+	}
+
+	keyBytes := curveBits / 8
+	if curveBits%8 > 0 {
+		keyBytes += 1
+	}
+
+	// We serialize the outpus (r and s) into big-endian byte arrays and pad
+	// them with zeros on the left to make sure the sizes work out. Both arrays
+	// must be keyBytes long, and the output must be 2*keyBytes long.
+	rBytes := r.Bytes()
+	rBytesPadded := make([]byte, keyBytes)
+	copy(rBytesPadded[keyBytes-len(rBytes):], rBytes)
+
+	sBytes := s.Bytes()
+	sBytesPadded := make([]byte, keyBytes)
+	copy(sBytesPadded[keyBytes-len(sBytes):], sBytes)
+
+	out := append(rBytesPadded, sBytesPadded...)
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx ecEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	var keySize int
+	var hash crypto.Hash
+
+	switch alg {
+	case ES256:
+		keySize = 32
+		hash = crypto.SHA256
+	case ES384:
+		keySize = 48
+		hash = crypto.SHA384
+	case ES512:
+		keySize = 66
+		hash = crypto.SHA512
+	}
+
+	if len(signature) != 2*keySize {
+		return fmt.Errorf("square/go-jose: invalid signature size, have %d bytes, wanted %d", len(signature), 2*keySize)
+	}
+
+	hasher := hash.New()
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hasher.Write(payload)
+	hashed := hasher.Sum(nil)
+
+	r := big.NewInt(0).SetBytes(signature[:keySize])
+	s := big.NewInt(0).SetBytes(signature[keySize:])
+
+	match := ecdsa.Verify(ctx.publicKey, hashed, r, s)
+	if !match {
+		return errors.New("square/go-jose: ecdsa signature failed to verify")
+	}
+
+	return nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/asymmetric_test.go

@@ -0,0 +1,431 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/rand"
+	"crypto/rsa"
+	"errors"
+	"io"
+	"math/big"
+	"testing"
+)
+
+func TestVectorsRSA(t *testing.T) {
+	// Sources:
+	//   http://www.emc.com/emc-plus/rsa-labs/standards-initiatives/pkcs-rsa-cryptography-standard.htm
+	//   ftp://ftp.rsa.com/pub/rsalabs/tmp/pkcs1v15crypt-vectors.txt
+	priv := &rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: fromHexInt(`
+				a8b3b284af8eb50b387034a860f146c4919f318763cd6c5598c8
+				ae4811a1e0abc4c7e0b082d693a5e7fced675cf4668512772c0c
+				bc64a742c6c630f533c8cc72f62ae833c40bf25842e984bb78bd
+				bf97c0107d55bdb662f5c4e0fab9845cb5148ef7392dd3aaff93
+				ae1e6b667bb3d4247616d4f5ba10d4cfd226de88d39f16fb`),
+			E: 65537,
+		},
+		D: fromHexInt(`
+				53339cfdb79fc8466a655c7316aca85c55fd8f6dd898fdaf1195
+				17ef4f52e8fd8e258df93fee180fa0e4ab29693cd83b152a553d
+				4ac4d1812b8b9fa5af0e7f55fe7304df41570926f3311f15c4d6
+				5a732c483116ee3d3d2d0af3549ad9bf7cbfb78ad884f84d5beb
+				04724dc7369b31def37d0cf539e9cfcdd3de653729ead5d1`),
+		Primes: []*big.Int{
+			fromHexInt(`
+				d32737e7267ffe1341b2d5c0d150a81b586fb3132bed2f8d5262
+				864a9cb9f30af38be448598d413a172efb802c21acf1c11c520c
+				2f26a471dcad212eac7ca39d`),
+			fromHexInt(`
+				cc8853d1d54da630fac004f471f281c7b8982d8224a490edbeb3
+				3d3e3d5cc93c4765703d1dd791642f1f116a0dd852be2419b2af
+				72bfe9a030e860b0288b5d77`),
+		},
+	}
+
+	input := fromHexBytes(
+		"6628194e12073db03ba94cda9ef9532397d50dba79b987004afefe34")
+
+	expectedPKCS := fromHexBytes(`
+		50b4c14136bd198c2f3c3ed243fce036e168d56517984a263cd66492b808
+		04f169d210f2b9bdfb48b12f9ea05009c77da257cc600ccefe3a6283789d
+		8ea0e607ac58e2690ec4ebc10146e8cbaa5ed4d5cce6fe7b0ff9efc1eabb
+		564dbf498285f449ee61dd7b42ee5b5892cb90601f30cda07bf26489310b
+		cd23b528ceab3c31`)
+
+	expectedOAEP := fromHexBytes(`
+		354fe67b4a126d5d35fe36c777791a3f7ba13def484e2d3908aff722fad4
+		68fb21696de95d0be911c2d3174f8afcc201035f7b6d8e69402de5451618
+		c21a535fa9d7bfc5b8dd9fc243f8cf927db31322d6e881eaa91a996170e6
+		57a05a266426d98c88003f8477c1227094a0d9fa1e8c4024309ce1ecccb5
+		210035d47ac72e8a`)
+
+	// Mock random reader
+	randReader = bytes.NewReader(fromHexBytes(`
+		017341ae3875d5f87101f8cc4fa9b9bc156bb04628fccdb2f4f11e905bd3
+		a155d376f593bd7304210874eba08a5e22bcccb4c9d3882a93a54db022f5
+		03d16338b6b7ce16dc7f4bbf9a96b59772d6606e9747c7649bf9e083db98
+		1884a954ab3c6f18b776ea21069d69776a33e96bad48e1dda0a5ef`))
+	defer resetRandReader()
+
+	// RSA-PKCS1v1.5 encrypt
+	enc := new(rsaEncrypterVerifier)
+	enc.publicKey = &priv.PublicKey
+	encryptedPKCS, err := enc.encrypt(input, RSA1_5)
+	if err != nil {
+		t.Error("Encryption failed:", err)
+		return
+	}
+
+	if bytes.Compare(encryptedPKCS, expectedPKCS) != 0 {
+		t.Error("Output does not match expected value (PKCS1v1.5)")
+	}
+
+	// RSA-OAEP encrypt
+	encryptedOAEP, err := enc.encrypt(input, RSA_OAEP)
+	if err != nil {
+		t.Error("Encryption failed:", err)
+		return
+	}
+
+	if bytes.Compare(encryptedOAEP, expectedOAEP) != 0 {
+		t.Error("Output does not match expected value (OAEP)")
+	}
+
+	// Need fake cipher for PKCS1v1.5 decrypt
+	resetRandReader()
+	aes := newAESGCM(len(input))
+
+	keygen := randomKeyGenerator{
+		size: aes.keySize(),
+	}
+
+	// RSA-PKCS1v1.5 decrypt
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = priv
+	decryptedPKCS, err := dec.decrypt(encryptedPKCS, RSA1_5, keygen)
+	if err != nil {
+		t.Error("Decryption failed:", err)
+		return
+	}
+
+	if bytes.Compare(input, decryptedPKCS) != 0 {
+		t.Error("Output does not match expected value (PKCS1v1.5)")
+	}
+
+	// RSA-OAEP decrypt
+	decryptedOAEP, err := dec.decrypt(encryptedOAEP, RSA_OAEP, keygen)
+	if err != nil {
+		t.Error("decryption failed:", err)
+		return
+	}
+
+	if bytes.Compare(input, decryptedOAEP) != 0 {
+		t.Error("output does not match expected value (OAEP)")
+	}
+}
+
+func TestInvalidAlgorithmsRSA(t *testing.T) {
+	_, err := newRSARecipient("XYZ", nil)
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	_, err = newRSASigner("XYZ", nil)
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	enc := new(rsaEncrypterVerifier)
+	enc.publicKey = &rsaTestKey.PublicKey
+	_, err = enc.encryptKey([]byte{}, "XYZ")
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	err = enc.verifyPayload([]byte{}, []byte{}, "XYZ")
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = rsaTestKey
+	_, err = dec.decrypt(make([]byte, 256), "XYZ", randomKeyGenerator{size: 16})
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	_, err = dec.signPayload([]byte{}, "XYZ")
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+}
+
+type failingKeyGenerator struct{}
+
+func (ctx failingKeyGenerator) keySize() int {
+	return 0
+}
+
+func (ctx failingKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	return nil, rawHeader{}, errors.New("failed to generate key")
+}
+
+func TestPKCSKeyGeneratorFailure(t *testing.T) {
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = rsaTestKey
+	generator := failingKeyGenerator{}
+	_, err := dec.decrypt(make([]byte, 256), RSA1_5, generator)
+	if err != ErrCryptoFailure {
+		t.Error("should return error on invalid algorithm")
+	}
+}
+
+func TestInvalidAlgorithmsEC(t *testing.T) {
+	_, err := newECDHRecipient("XYZ", nil)
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	_, err = newECDSASigner("XYZ", nil)
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+
+	enc := new(ecEncrypterVerifier)
+	enc.publicKey = &ecTestKey256.PublicKey
+	_, err = enc.encryptKey([]byte{}, "XYZ")
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should return error on invalid algorithm")
+	}
+}
+
+func TestInvalidECKeyGen(t *testing.T) {
+	gen := ecKeyGenerator{
+		size:      16,
+		algID:     "A128GCM",
+		publicKey: &ecTestKey256.PublicKey,
+	}
+
+	if gen.keySize() != 16 {
+		t.Error("ec key generator reported incorrect key size")
+	}
+
+	_, _, err := gen.genKey()
+	if err != nil {
+		t.Error("ec key generator failed to generate key", err)
+	}
+}
+
+func TestInvalidECDecrypt(t *testing.T) {
+	dec := ecDecrypterSigner{
+		privateKey: ecTestKey256,
+	}
+
+	generator := randomKeyGenerator{size: 16}
+
+	// Missing epk header
+	headers := rawHeader{
+		Alg: string(ECDH_ES),
+	}
+
+	_, err := dec.decryptKey(headers, nil, generator)
+	if err == nil {
+		t.Error("ec decrypter accepted object with missing epk header")
+	}
+
+	// Invalid epk header
+	headers.Epk = &JsonWebKey{}
+
+	_, err = dec.decryptKey(headers, nil, generator)
+	if err == nil {
+		t.Error("ec decrypter accepted object with invalid epk header")
+	}
+}
+
+func TestDecryptWithIncorrectSize(t *testing.T) {
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = priv
+	aes := newAESGCM(16)
+
+	keygen := randomKeyGenerator{
+		size: aes.keySize(),
+	}
+
+	payload := make([]byte, 254)
+	_, err = dec.decrypt(payload, RSA1_5, keygen)
+	if err == nil {
+		t.Error("Invalid payload size should return error")
+	}
+
+	payload = make([]byte, 257)
+	_, err = dec.decrypt(payload, RSA1_5, keygen)
+	if err == nil {
+		t.Error("Invalid payload size should return error")
+	}
+}
+
+func TestPKCSDecryptNeverFails(t *testing.T) {
+	// We don't want RSA-PKCS1 v1.5 decryption to ever fail, in order to prevent
+	// side-channel timing attacks (Bleichenbacher attack in particular).
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = priv
+	aes := newAESGCM(16)
+
+	keygen := randomKeyGenerator{
+		size: aes.keySize(),
+	}
+
+	for i := 1; i < 50; i++ {
+		payload := make([]byte, 256)
+		_, err := io.ReadFull(rand.Reader, payload)
+		if err != nil {
+			t.Error("Unable to get random data:", err)
+			return
+		}
+		_, err = dec.decrypt(payload, RSA1_5, keygen)
+		if err != nil {
+			t.Error("PKCS1v1.5 decrypt should never fail:", err)
+			return
+		}
+	}
+}
+
+func BenchmarkPKCSDecryptWithValidPayloads(b *testing.B) {
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		panic(err)
+	}
+
+	enc := new(rsaEncrypterVerifier)
+	enc.publicKey = &priv.PublicKey
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = priv
+	aes := newAESGCM(32)
+
+	b.StopTimer()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		plaintext := make([]byte, 32)
+		_, err = io.ReadFull(rand.Reader, plaintext)
+		if err != nil {
+			panic(err)
+		}
+
+		ciphertext, err := enc.encrypt(plaintext, RSA1_5)
+		if err != nil {
+			panic(err)
+		}
+
+		keygen := randomKeyGenerator{
+			size: aes.keySize(),
+		}
+
+		b.StartTimer()
+		_, err = dec.decrypt(ciphertext, RSA1_5, keygen)
+		b.StopTimer()
+		if err != nil {
+			panic(err)
+		}
+	}
+}
+
+func BenchmarkPKCSDecryptWithInvalidPayloads(b *testing.B) {
+	priv, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		panic(err)
+	}
+
+	enc := new(rsaEncrypterVerifier)
+	enc.publicKey = &priv.PublicKey
+	dec := new(rsaDecrypterSigner)
+	dec.privateKey = priv
+	aes := newAESGCM(16)
+
+	keygen := randomKeyGenerator{
+		size: aes.keySize(),
+	}
+
+	b.StopTimer()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		plaintext := make([]byte, 16)
+		_, err = io.ReadFull(rand.Reader, plaintext)
+		if err != nil {
+			panic(err)
+		}
+
+		ciphertext, err := enc.encrypt(plaintext, RSA1_5)
+		if err != nil {
+			panic(err)
+		}
+
+		// Do some simple scrambling
+		ciphertext[128] ^= 0xFF
+
+		b.StartTimer()
+		_, err = dec.decrypt(ciphertext, RSA1_5, keygen)
+		b.StopTimer()
+		if err != nil {
+			panic(err)
+		}
+	}
+}
+
+func TestInvalidEllipticCurve(t *testing.T) {
+	signer256 := ecDecrypterSigner{privateKey: ecTestKey256}
+	signer384 := ecDecrypterSigner{privateKey: ecTestKey384}
+	signer521 := ecDecrypterSigner{privateKey: ecTestKey521}
+
+	_, err := signer256.signPayload([]byte{}, ES384)
+	if err == nil {
+		t.Error("should not generate ES384 signature with P-256 key")
+	}
+	_, err = signer256.signPayload([]byte{}, ES512)
+	if err == nil {
+		t.Error("should not generate ES512 signature with P-256 key")
+	}
+	_, err = signer384.signPayload([]byte{}, ES256)
+	if err == nil {
+		t.Error("should not generate ES256 signature with P-384 key")
+	}
+	_, err = signer384.signPayload([]byte{}, ES512)
+	if err == nil {
+		t.Error("should not generate ES512 signature with P-384 key")
+	}
+	_, err = signer521.signPayload([]byte{}, ES256)
+	if err == nil {
+		t.Error("should not generate ES256 signature with P-521 key")
+	}
+	_, err = signer521.signPayload([]byte{}, ES384)
+	if err == nil {
+		t.Error("should not generate ES384 signature with P-521 key")
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/cbc_hmac.go

@@ -0,0 +1,196 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/sha256"
+	"crypto/sha512"
+	"crypto/subtle"
+	"encoding/binary"
+	"errors"
+	"hash"
+)
+
+const (
+	nonceBytes = 16
+)
+
+// NewCBCHMAC instantiates a new AEAD based on CBC+HMAC.
+func NewCBCHMAC(key []byte, newBlockCipher func([]byte) (cipher.Block, error)) (cipher.AEAD, error) {
+	keySize := len(key) / 2
+	integrityKey := key[:keySize]
+	encryptionKey := key[keySize:]
+
+	blockCipher, err := newBlockCipher(encryptionKey)
+	if err != nil {
+		return nil, err
+	}
+
+	var hash func() hash.Hash
+	switch keySize {
+	case 16:
+		hash = sha256.New
+	case 24:
+		hash = sha512.New384
+	case 32:
+		hash = sha512.New
+	}
+
+	return &cbcAEAD{
+		hash:         hash,
+		blockCipher:  blockCipher,
+		authtagBytes: keySize,
+		integrityKey: integrityKey,
+	}, nil
+}
+
+// An AEAD based on CBC+HMAC
+type cbcAEAD struct {
+	hash         func() hash.Hash
+	authtagBytes int
+	integrityKey []byte
+	blockCipher  cipher.Block
+}
+
+func (ctx *cbcAEAD) NonceSize() int {
+	return nonceBytes
+}
+
+func (ctx *cbcAEAD) Overhead() int {
+	// Maximum overhead is block size (for padding) plus auth tag length, where
+	// the length of the auth tag is equivalent to the key size.
+	return ctx.blockCipher.BlockSize() + ctx.authtagBytes
+}
+
+// Seal encrypts and authenticates the plaintext.
+func (ctx *cbcAEAD) Seal(dst, nonce, plaintext, data []byte) []byte {
+	// Output buffer -- must take care not to mangle plaintext input.
+	ciphertext := make([]byte, len(plaintext)+ctx.Overhead())[:len(plaintext)]
+	copy(ciphertext, plaintext)
+	ciphertext = padBuffer(ciphertext, ctx.blockCipher.BlockSize())
+
+	cbc := cipher.NewCBCEncrypter(ctx.blockCipher, nonce)
+
+	cbc.CryptBlocks(ciphertext, ciphertext)
+	authtag := ctx.computeAuthTag(data, nonce, ciphertext)
+
+	ret, out := resize(dst, len(dst)+len(ciphertext)+len(authtag))
+	copy(out, ciphertext)
+	copy(out[len(ciphertext):], authtag)
+
+	return ret
+}
+
+// Open decrypts and authenticates the ciphertext.
+func (ctx *cbcAEAD) Open(dst, nonce, ciphertext, data []byte) ([]byte, error) {
+	if len(ciphertext) < ctx.authtagBytes {
+		return nil, errors.New("square/go-jose: invalid ciphertext (too short)")
+	}
+
+	offset := len(ciphertext) - ctx.authtagBytes
+	expectedTag := ctx.computeAuthTag(data, nonce, ciphertext[:offset])
+	match := subtle.ConstantTimeCompare(expectedTag, ciphertext[offset:])
+	if match != 1 {
+		return nil, errors.New("square/go-jose: invalid ciphertext (auth tag mismatch)")
+	}
+
+	cbc := cipher.NewCBCDecrypter(ctx.blockCipher, nonce)
+
+	// Make copy of ciphertext buffer, don't want to modify in place
+	buffer := append([]byte{}, []byte(ciphertext[:offset])...)
+
+	if len(buffer)%ctx.blockCipher.BlockSize() > 0 {
+		return nil, errors.New("square/go-jose: invalid ciphertext (invalid length)")
+	}
+
+	cbc.CryptBlocks(buffer, buffer)
+
+	// Remove padding
+	plaintext, err := unpadBuffer(buffer, ctx.blockCipher.BlockSize())
+	if err != nil {
+		return nil, err
+	}
+
+	ret, out := resize(dst, len(dst)+len(plaintext))
+	copy(out, plaintext)
+
+	return ret, nil
+}
+
+// Compute an authentication tag
+func (ctx *cbcAEAD) computeAuthTag(aad, nonce, ciphertext []byte) []byte {
+	buffer := make([]byte, len(aad)+len(nonce)+len(ciphertext)+8)
+	n := 0
+	n += copy(buffer, aad)
+	n += copy(buffer[n:], nonce)
+	n += copy(buffer[n:], ciphertext)
+	binary.BigEndian.PutUint64(buffer[n:], uint64(len(aad)*8))
+
+	// According to documentation, Write() on hash.Hash never fails.
+	hmac := hmac.New(ctx.hash, ctx.integrityKey)
+	_, _ = hmac.Write(buffer)
+
+	return hmac.Sum(nil)[:ctx.authtagBytes]
+}
+
+// resize ensures the the given slice has a capacity of at least n bytes.
+// If the capacity of the slice is less than n, a new slice is allocated
+// and the existing data will be copied.
+func resize(in []byte, n int) (head, tail []byte) {
+	if cap(in) >= n {
+		head = in[:n]
+	} else {
+		head = make([]byte, n)
+		copy(head, in)
+	}
+
+	tail = head[len(in):]
+	return
+}
+
+// Apply padding
+func padBuffer(buffer []byte, blockSize int) []byte {
+	missing := blockSize - (len(buffer) % blockSize)
+	ret, out := resize(buffer, len(buffer)+missing)
+	padding := bytes.Repeat([]byte{byte(missing)}, missing)
+	copy(out, padding)
+	return ret
+}
+
+// Remove padding
+func unpadBuffer(buffer []byte, blockSize int) ([]byte, error) {
+	if len(buffer)%blockSize != 0 {
+		return nil, errors.New("square/go-jose: invalid padding")
+	}
+
+	last := buffer[len(buffer)-1]
+	count := int(last)
+
+	if count == 0 || count > blockSize || count > len(buffer) {
+		return nil, errors.New("square/go-jose: invalid padding")
+	}
+
+	padding := bytes.Repeat([]byte{last}, count)
+	if !bytes.HasSuffix(buffer, padding) {
+		return nil, errors.New("square/go-jose: invalid padding")
+	}
+
+	return buffer[:len(buffer)-count], nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/cbc_hmac_test.go

@@ -0,0 +1,498 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"io"
+	"strings"
+	"testing"
+)
+
+func TestInvalidInputs(t *testing.T) {
+	key := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+	}
+
+	nonce := []byte{
+		92, 80, 104, 49, 133, 25, 161, 215, 173, 101, 219, 211, 136, 91, 210, 145}
+
+	aead, _ := NewCBCHMAC(key, aes.NewCipher)
+	ciphertext := aead.Seal(nil, nonce, []byte("plaintext"), []byte("aad"))
+
+	// Changed AAD, must fail
+	_, err := aead.Open(nil, nonce, ciphertext, []byte("INVALID"))
+	if err == nil {
+		t.Error("must detect invalid aad")
+	}
+
+	// Empty ciphertext, must fail
+	_, err = aead.Open(nil, nonce, []byte{}, []byte("aad"))
+	if err == nil {
+		t.Error("must detect invalid/empty ciphertext")
+	}
+
+	// Corrupt ciphertext, must fail
+	corrupt := make([]byte, len(ciphertext))
+	copy(corrupt, ciphertext)
+	corrupt[0] ^= 0xFF
+
+	_, err = aead.Open(nil, nonce, corrupt, []byte("aad"))
+	if err == nil {
+		t.Error("must detect corrupt ciphertext")
+	}
+
+	// Corrupt authtag, must fail
+	copy(corrupt, ciphertext)
+	corrupt[len(ciphertext)-1] ^= 0xFF
+
+	_, err = aead.Open(nil, nonce, corrupt, []byte("aad"))
+	if err == nil {
+		t.Error("must detect corrupt authtag")
+	}
+
+	// Truncated data, must fail
+	_, err = aead.Open(nil, nonce, ciphertext[:10], []byte("aad"))
+	if err == nil {
+		t.Error("must detect corrupt authtag")
+	}
+}
+
+func TestVectorsAESCBC128(t *testing.T) {
+	// Source: http://tools.ietf.org/html/draft-ietf-jose-json-web-encryption-29#appendix-A.2
+	plaintext := []byte{
+		76, 105, 118, 101, 32, 108, 111, 110, 103, 32, 97, 110, 100, 32,
+		112, 114, 111, 115, 112, 101, 114, 46}
+
+	aad := []byte{
+		101, 121, 74, 104, 98, 71, 99, 105, 79, 105, 74, 83, 85, 48, 69,
+		120, 88, 122, 85, 105, 76, 67, 74, 108, 98, 109, 77, 105, 79, 105,
+		74, 66, 77, 84, 73, 52, 81, 48, 74, 68, 76, 85, 104, 84, 77, 106, 85,
+		50, 73, 110, 48}
+
+	expectedCiphertext := []byte{
+		40, 57, 83, 181, 119, 33, 133, 148, 198, 185, 243, 24, 152, 230, 6,
+		75, 129, 223, 127, 19, 210, 82, 183, 230, 168, 33, 215, 104, 143,
+		112, 56, 102}
+
+	expectedAuthtag := []byte{
+		246, 17, 244, 190, 4, 95, 98, 3, 231, 0, 115, 157, 242, 203, 100,
+		191}
+
+	key := []byte{
+		4, 211, 31, 197, 84, 157, 252, 254, 11, 100, 157, 250, 63, 170, 106, 206,
+		107, 124, 212, 45, 111, 107, 9, 219, 200, 177, 0, 240, 143, 156, 44, 207}
+
+	nonce := []byte{
+		3, 22, 60, 12, 43, 67, 104, 105, 108, 108, 105, 99, 111, 116, 104, 101}
+
+	enc, err := NewCBCHMAC(key, aes.NewCipher)
+	out := enc.Seal(nil, nonce, plaintext, aad)
+	if err != nil {
+		t.Error("Unable to encrypt:", err)
+		return
+	}
+
+	if bytes.Compare(out[:len(out)-16], expectedCiphertext) != 0 {
+		t.Error("Ciphertext did not match")
+	}
+	if bytes.Compare(out[len(out)-16:], expectedAuthtag) != 0 {
+		t.Error("Auth tag did not match")
+	}
+}
+
+func TestVectorsAESCBC256(t *testing.T) {
+	// Source: https://tools.ietf.org/html/draft-mcgrew-aead-aes-cbc-hmac-sha2-05#section-5.4
+	plaintext := []byte{
+		0x41, 0x20, 0x63, 0x69, 0x70, 0x68, 0x65, 0x72, 0x20, 0x73, 0x79, 0x73, 0x74, 0x65, 0x6d, 0x20,
+		0x6d, 0x75, 0x73, 0x74, 0x20, 0x6e, 0x6f, 0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x65, 0x71, 0x75,
+		0x69, 0x72, 0x65, 0x64, 0x20, 0x74, 0x6f, 0x20, 0x62, 0x65, 0x20, 0x73, 0x65, 0x63, 0x72, 0x65,
+		0x74, 0x2c, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x69, 0x74, 0x20, 0x6d, 0x75, 0x73, 0x74, 0x20, 0x62,
+		0x65, 0x20, 0x61, 0x62, 0x6c, 0x65, 0x20, 0x74, 0x6f, 0x20, 0x66, 0x61, 0x6c, 0x6c, 0x20, 0x69,
+		0x6e, 0x74, 0x6f, 0x20, 0x74, 0x68, 0x65, 0x20, 0x68, 0x61, 0x6e, 0x64, 0x73, 0x20, 0x6f, 0x66,
+		0x20, 0x74, 0x68, 0x65, 0x20, 0x65, 0x6e, 0x65, 0x6d, 0x79, 0x20, 0x77, 0x69, 0x74, 0x68, 0x6f,
+		0x75, 0x74, 0x20, 0x69, 0x6e, 0x63, 0x6f, 0x6e, 0x76, 0x65, 0x6e, 0x69, 0x65, 0x6e, 0x63, 0x65}
+
+	aad := []byte{
+		0x54, 0x68, 0x65, 0x20, 0x73, 0x65, 0x63, 0x6f, 0x6e, 0x64, 0x20, 0x70, 0x72, 0x69, 0x6e, 0x63,
+		0x69, 0x70, 0x6c, 0x65, 0x20, 0x6f, 0x66, 0x20, 0x41, 0x75, 0x67, 0x75, 0x73, 0x74, 0x65, 0x20,
+		0x4b, 0x65, 0x72, 0x63, 0x6b, 0x68, 0x6f, 0x66, 0x66, 0x73}
+
+	expectedCiphertext := []byte{
+		0x4a, 0xff, 0xaa, 0xad, 0xb7, 0x8c, 0x31, 0xc5, 0xda, 0x4b, 0x1b, 0x59, 0x0d, 0x10, 0xff, 0xbd,
+		0x3d, 0xd8, 0xd5, 0xd3, 0x02, 0x42, 0x35, 0x26, 0x91, 0x2d, 0xa0, 0x37, 0xec, 0xbc, 0xc7, 0xbd,
+		0x82, 0x2c, 0x30, 0x1d, 0xd6, 0x7c, 0x37, 0x3b, 0xcc, 0xb5, 0x84, 0xad, 0x3e, 0x92, 0x79, 0xc2,
+		0xe6, 0xd1, 0x2a, 0x13, 0x74, 0xb7, 0x7f, 0x07, 0x75, 0x53, 0xdf, 0x82, 0x94, 0x10, 0x44, 0x6b,
+		0x36, 0xeb, 0xd9, 0x70, 0x66, 0x29, 0x6a, 0xe6, 0x42, 0x7e, 0xa7, 0x5c, 0x2e, 0x08, 0x46, 0xa1,
+		0x1a, 0x09, 0xcc, 0xf5, 0x37, 0x0d, 0xc8, 0x0b, 0xfe, 0xcb, 0xad, 0x28, 0xc7, 0x3f, 0x09, 0xb3,
+		0xa3, 0xb7, 0x5e, 0x66, 0x2a, 0x25, 0x94, 0x41, 0x0a, 0xe4, 0x96, 0xb2, 0xe2, 0xe6, 0x60, 0x9e,
+		0x31, 0xe6, 0xe0, 0x2c, 0xc8, 0x37, 0xf0, 0x53, 0xd2, 0x1f, 0x37, 0xff, 0x4f, 0x51, 0x95, 0x0b,
+		0xbe, 0x26, 0x38, 0xd0, 0x9d, 0xd7, 0xa4, 0x93, 0x09, 0x30, 0x80, 0x6d, 0x07, 0x03, 0xb1, 0xf6}
+
+	expectedAuthtag := []byte{
+		0x4d, 0xd3, 0xb4, 0xc0, 0x88, 0xa7, 0xf4, 0x5c, 0x21, 0x68, 0x39, 0x64, 0x5b, 0x20, 0x12, 0xbf,
+		0x2e, 0x62, 0x69, 0xa8, 0xc5, 0x6a, 0x81, 0x6d, 0xbc, 0x1b, 0x26, 0x77, 0x61, 0x95, 0x5b, 0xc5}
+
+	key := []byte{
+		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+		0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
+		0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+		0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f}
+
+	nonce := []byte{
+		0x1a, 0xf3, 0x8c, 0x2d, 0xc2, 0xb9, 0x6f, 0xfd, 0xd8, 0x66, 0x94, 0x09, 0x23, 0x41, 0xbc, 0x04}
+
+	enc, err := NewCBCHMAC(key, aes.NewCipher)
+	out := enc.Seal(nil, nonce, plaintext, aad)
+	if err != nil {
+		t.Error("Unable to encrypt:", err)
+		return
+	}
+
+	if bytes.Compare(out[:len(out)-32], expectedCiphertext) != 0 {
+		t.Error("Ciphertext did not match, got", out[:len(out)-32], "wanted", expectedCiphertext)
+	}
+	if bytes.Compare(out[len(out)-32:], expectedAuthtag) != 0 {
+		t.Error("Auth tag did not match, got", out[len(out)-32:], "wanted", expectedAuthtag)
+	}
+}
+
+func TestAESCBCRoundtrip(t *testing.T) {
+	key128 := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
+
+	key192 := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7}
+
+	key256 := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
+
+	nonce := []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
+
+	RunRoundtrip(t, key128, nonce)
+	RunRoundtrip(t, key192, nonce)
+	RunRoundtrip(t, key256, nonce)
+}
+
+func RunRoundtrip(t *testing.T, key, nonce []byte) {
+	aead, err := NewCBCHMAC(key, aes.NewCipher)
+	if err != nil {
+		panic(err)
+	}
+
+	if aead.NonceSize() != len(nonce) {
+		panic("invalid nonce")
+	}
+
+	// Test pre-existing data in dst buffer
+	dst := []byte{15, 15, 15, 15}
+	plaintext := []byte{0, 0, 0, 0}
+	aad := []byte{4, 3, 2, 1}
+
+	result := aead.Seal(dst, nonce, plaintext, aad)
+	if bytes.Compare(dst, result[:4]) != 0 {
+		t.Error("Existing data in dst not preserved")
+	}
+
+	// Test pre-existing (empty) dst buffer with sufficient capacity
+	dst = make([]byte, 256)[:0]
+	result, err = aead.Open(dst, nonce, result[4:], aad)
+	if err != nil {
+		panic(err)
+	}
+
+	if bytes.Compare(result, plaintext) != 0 {
+		t.Error("Plaintext does not match output")
+	}
+}
+
+func TestAESCBCOverhead(t *testing.T) {
+	aead, err := NewCBCHMAC(make([]byte, 32), aes.NewCipher)
+	if err != nil {
+		panic(err)
+	}
+
+	if aead.Overhead() != 32 {
+		t.Error("CBC-HMAC reports incorrect overhead value")
+	}
+}
+
+func TestPadding(t *testing.T) {
+	for i := 0; i < 256; i++ {
+		slice := make([]byte, i)
+		padded := padBuffer(slice, 16)
+		if len(padded)%16 != 0 {
+			t.Error("failed to pad slice properly", i)
+			return
+		}
+		unpadded, err := unpadBuffer(padded, 16)
+		if err != nil || len(unpadded) != i {
+			t.Error("failed to unpad slice properly", i)
+			return
+		}
+	}
+}
+
+func TestInvalidKey(t *testing.T) {
+	key := make([]byte, 30)
+	_, err := NewCBCHMAC(key, aes.NewCipher)
+	if err == nil {
+		t.Error("should not be able to instantiate CBC-HMAC with invalid key")
+	}
+}
+
+func TestTruncatedCiphertext(t *testing.T) {
+	key := make([]byte, 32)
+	nonce := make([]byte, 16)
+	data := make([]byte, 32)
+
+	io.ReadFull(rand.Reader, key)
+	io.ReadFull(rand.Reader, nonce)
+
+	aead, err := NewCBCHMAC(key, aes.NewCipher)
+	if err != nil {
+		panic(err)
+	}
+
+	ctx := aead.(*cbcAEAD)
+	ct := aead.Seal(nil, nonce, data, nil)
+
+	// Truncated ciphertext, but with correct auth tag
+	truncated, tail := resize(ct[:len(ct)-ctx.authtagBytes-2], len(ct)-2)
+	copy(tail, ctx.computeAuthTag(nil, nonce, truncated[:len(truncated)-ctx.authtagBytes]))
+
+	// Open should fail
+	_, err = aead.Open(nil, nonce, truncated, nil)
+	if err == nil {
+		t.Error("open on truncated ciphertext should fail")
+	}
+}
+
+func TestInvalidPaddingOpen(t *testing.T) {
+	key := make([]byte, 32)
+	nonce := make([]byte, 16)
+
+	// Plaintext with invalid padding
+	plaintext := padBuffer(make([]byte, 28), aes.BlockSize)
+	plaintext[len(plaintext)-1] = 0xFF
+
+	io.ReadFull(rand.Reader, key)
+	io.ReadFull(rand.Reader, nonce)
+
+	block, _ := aes.NewCipher(key)
+	cbc := cipher.NewCBCEncrypter(block, nonce)
+	buffer := append([]byte{}, plaintext...)
+	cbc.CryptBlocks(buffer, buffer)
+
+	aead, _ := NewCBCHMAC(key, aes.NewCipher)
+	ctx := aead.(*cbcAEAD)
+
+	// Mutated ciphertext, but with correct auth tag
+	size := len(buffer)
+	ciphertext, tail := resize(buffer, size+(len(key)/2))
+	copy(tail, ctx.computeAuthTag(nil, nonce, ciphertext[:size]))
+
+	// Open should fail (b/c of invalid padding, even though tag matches)
+	_, err := aead.Open(nil, nonce, ciphertext, nil)
+	if err == nil || !strings.Contains(err.Error(), "invalid padding") {
+		t.Error("no or unexpected error on open with invalid padding:", err)
+	}
+}
+
+func TestInvalidPadding(t *testing.T) {
+	for i := 0; i < 256; i++ {
+		slice := make([]byte, i)
+		padded := padBuffer(slice, 16)
+		if len(padded)%16 != 0 {
+			t.Error("failed to pad slice properly", i)
+			return
+		}
+
+		paddingBytes := 16 - (i % 16)
+
+		// Mutate padding for testing
+		for j := 1; j <= paddingBytes; j++ {
+			mutated := make([]byte, len(padded))
+			copy(mutated, padded)
+			mutated[len(mutated)-j] ^= 0xFF
+
+			_, err := unpadBuffer(mutated, 16)
+			if err == nil {
+				t.Error("unpad on invalid padding should fail", i)
+				return
+			}
+		}
+
+		// Test truncated padding
+		_, err := unpadBuffer(padded[:len(padded)-1], 16)
+		if err == nil {
+			t.Error("unpad on truncated padding should fail", i)
+			return
+		}
+	}
+}
+
+func TestZeroLengthPadding(t *testing.T) {
+	data := make([]byte, 16)
+	data, err := unpadBuffer(data, 16)
+	if err == nil {
+		t.Error("padding with 0x00 should never be valid")
+	}
+}
+
+func benchEncryptCBCHMAC(b *testing.B, keySize, chunkSize int) {
+	key := make([]byte, keySize*2)
+	nonce := make([]byte, 16)
+
+	io.ReadFull(rand.Reader, key)
+	io.ReadFull(rand.Reader, nonce)
+
+	chunk := make([]byte, chunkSize)
+
+	aead, err := NewCBCHMAC(key, aes.NewCipher)
+	if err != nil {
+		panic(err)
+	}
+
+	b.SetBytes(int64(chunkSize))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		aead.Seal(nil, nonce, chunk, nil)
+	}
+}
+
+func benchDecryptCBCHMAC(b *testing.B, keySize, chunkSize int) {
+	key := make([]byte, keySize*2)
+	nonce := make([]byte, 16)
+
+	io.ReadFull(rand.Reader, key)
+	io.ReadFull(rand.Reader, nonce)
+
+	chunk := make([]byte, chunkSize)
+
+	aead, err := NewCBCHMAC(key, aes.NewCipher)
+	if err != nil {
+		panic(err)
+	}
+
+	out := aead.Seal(nil, nonce, chunk, nil)
+
+	b.SetBytes(int64(chunkSize))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		aead.Open(nil, nonce, out, nil)
+	}
+}
+
+func BenchmarkEncryptAES128_CBCHMAC_1k(b *testing.B) {
+	benchEncryptCBCHMAC(b, 16, 1024)
+}
+
+func BenchmarkEncryptAES128_CBCHMAC_64k(b *testing.B) {
+	benchEncryptCBCHMAC(b, 16, 65536)
+}
+
+func BenchmarkEncryptAES128_CBCHMAC_1MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 16, 1048576)
+}
+
+func BenchmarkEncryptAES128_CBCHMAC_64MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 16, 67108864)
+}
+
+func BenchmarkDecryptAES128_CBCHMAC_1k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 16, 1024)
+}
+
+func BenchmarkDecryptAES128_CBCHMAC_64k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 16, 65536)
+}
+
+func BenchmarkDecryptAES128_CBCHMAC_1MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 16, 1048576)
+}
+
+func BenchmarkDecryptAES128_CBCHMAC_64MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 16, 67108864)
+}
+
+func BenchmarkEncryptAES192_CBCHMAC_64k(b *testing.B) {
+	benchEncryptCBCHMAC(b, 24, 65536)
+}
+
+func BenchmarkEncryptAES192_CBCHMAC_1MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 24, 1048576)
+}
+
+func BenchmarkEncryptAES192_CBCHMAC_64MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 24, 67108864)
+}
+
+func BenchmarkDecryptAES192_CBCHMAC_1k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 24, 1024)
+}
+
+func BenchmarkDecryptAES192_CBCHMAC_64k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 24, 65536)
+}
+
+func BenchmarkDecryptAES192_CBCHMAC_1MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 24, 1048576)
+}
+
+func BenchmarkDecryptAES192_CBCHMAC_64MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 24, 67108864)
+}
+
+func BenchmarkEncryptAES256_CBCHMAC_64k(b *testing.B) {
+	benchEncryptCBCHMAC(b, 32, 65536)
+}
+
+func BenchmarkEncryptAES256_CBCHMAC_1MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 32, 1048576)
+}
+
+func BenchmarkEncryptAES256_CBCHMAC_64MB(b *testing.B) {
+	benchEncryptCBCHMAC(b, 32, 67108864)
+}
+
+func BenchmarkDecryptAES256_CBCHMAC_1k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 32, 1032)
+}
+
+func BenchmarkDecryptAES256_CBCHMAC_64k(b *testing.B) {
+	benchDecryptCBCHMAC(b, 32, 65536)
+}
+
+func BenchmarkDecryptAES256_CBCHMAC_1MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 32, 1048576)
+}
+
+func BenchmarkDecryptAES256_CBCHMAC_64MB(b *testing.B) {
+	benchDecryptCBCHMAC(b, 32, 67108864)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/concat_kdf.go

@@ -0,0 +1,75 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"crypto"
+	"encoding/binary"
+	"hash"
+	"io"
+)
+
+type concatKDF struct {
+	z, info []byte
+	i       uint32
+	cache   []byte
+	hasher  hash.Hash
+}
+
+// NewConcatKDF builds a KDF reader based on the given inputs.
+func NewConcatKDF(hash crypto.Hash, z, algID, ptyUInfo, ptyVInfo, supPubInfo, supPrivInfo []byte) io.Reader {
+	buffer := make([]byte, len(algID)+len(ptyUInfo)+len(ptyVInfo)+len(supPubInfo)+len(supPrivInfo))
+	n := 0
+	n += copy(buffer, algID)
+	n += copy(buffer[n:], ptyUInfo)
+	n += copy(buffer[n:], ptyVInfo)
+	n += copy(buffer[n:], supPubInfo)
+	copy(buffer[n:], supPrivInfo)
+
+	hasher := hash.New()
+
+	return &concatKDF{
+		z:      z,
+		info:   buffer,
+		hasher: hasher,
+		cache:  []byte{},
+		i:      1,
+	}
+}
+
+func (ctx *concatKDF) Read(out []byte) (int, error) {
+	copied := copy(out, ctx.cache)
+	ctx.cache = ctx.cache[copied:]
+
+	for copied < len(out) {
+		ctx.hasher.Reset()
+
+		// Write on a hash.Hash never fails
+		_ = binary.Write(ctx.hasher, binary.BigEndian, ctx.i)
+		_, _ = ctx.hasher.Write(ctx.z)
+		_, _ = ctx.hasher.Write(ctx.info)
+
+		hash := ctx.hasher.Sum(nil)
+		chunkCopied := copy(out[copied:], hash)
+		copied += chunkCopied
+		ctx.cache = hash[chunkCopied:]
+
+		ctx.i++
+	}
+
+	return copied, nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/concat_kdf_test.go

@@ -0,0 +1,150 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto"
+	"testing"
+)
+
+// Taken from: https://tools.ietf.org/id/draft-ietf-jose-json-web-algorithms-38.txt
+func TestVectorConcatKDF(t *testing.T) {
+	z := []byte{
+		158, 86, 217, 29, 129, 113, 53, 211, 114, 131, 66, 131, 191, 132,
+		38, 156, 251, 49, 110, 163, 218, 128, 106, 72, 246, 218, 167, 121,
+		140, 254, 144, 196}
+
+	algID := []byte{0, 0, 0, 7, 65, 49, 50, 56, 71, 67, 77}
+
+	ptyUInfo := []byte{0, 0, 0, 5, 65, 108, 105, 99, 101}
+	ptyVInfo := []byte{0, 0, 0, 3, 66, 111, 98}
+
+	supPubInfo := []byte{0, 0, 0, 128}
+	supPrivInfo := []byte{}
+
+	expected := []byte{
+		86, 170, 141, 234, 248, 35, 109, 32, 92, 34, 40, 205, 113, 167, 16, 26}
+
+	ckdf := NewConcatKDF(crypto.SHA256, z, algID, ptyUInfo, ptyVInfo, supPubInfo, supPrivInfo)
+
+	out0 := make([]byte, 9)
+	out1 := make([]byte, 7)
+
+	read0, err := ckdf.Read(out0)
+	if err != nil {
+		t.Error("error when reading from concat kdf reader", err)
+		return
+	}
+
+	read1, err := ckdf.Read(out1)
+	if err != nil {
+		t.Error("error when reading from concat kdf reader", err)
+		return
+	}
+
+	if read0+read1 != len(out0)+len(out1) {
+		t.Error("did not receive enough bytes from concat kdf reader")
+		return
+	}
+
+	out := []byte{}
+	out = append(out, out0...)
+	out = append(out, out1...)
+
+	if bytes.Compare(out, expected) != 0 {
+		t.Error("did not receive expected output from concat kdf reader")
+		return
+	}
+}
+
+func TestCache(t *testing.T) {
+	z := []byte{
+		158, 86, 217, 29, 129, 113, 53, 211, 114, 131, 66, 131, 191, 132,
+		38, 156, 251, 49, 110, 163, 218, 128, 106, 72, 246, 218, 167, 121,
+		140, 254, 144, 196}
+
+	algID := []byte{1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4}
+
+	ptyUInfo := []byte{1, 2, 3, 4}
+	ptyVInfo := []byte{4, 3, 2, 1}
+
+	supPubInfo := []byte{}
+	supPrivInfo := []byte{}
+
+	outputs := [][]byte{}
+
+	// Read the same amount of data in different chunk sizes
+	chunkSizes := []int{1, 2, 4, 8, 16, 32, 64, 128, 256, 512}
+
+	for _, c := range chunkSizes {
+		out := make([]byte, 1024)
+		reader := NewConcatKDF(crypto.SHA256, z, algID, ptyUInfo, ptyVInfo, supPubInfo, supPrivInfo)
+
+		for i := 0; i < 1024; i += c {
+			_, _ = reader.Read(out[i : i+c])
+		}
+
+		outputs = append(outputs, out)
+	}
+
+	for i := range outputs {
+		if bytes.Compare(outputs[i], outputs[(i+1)%len(outputs)]) != 0 {
+			t.Error("not all outputs from KDF matched")
+		}
+	}
+}
+
+func benchmarkKDF(b *testing.B, total int) {
+	z := []byte{
+		158, 86, 217, 29, 129, 113, 53, 211, 114, 131, 66, 131, 191, 132,
+		38, 156, 251, 49, 110, 163, 218, 128, 106, 72, 246, 218, 167, 121,
+		140, 254, 144, 196}
+
+	algID := []byte{1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4}
+
+	ptyUInfo := []byte{1, 2, 3, 4}
+	ptyVInfo := []byte{4, 3, 2, 1}
+
+	supPubInfo := []byte{}
+	supPrivInfo := []byte{}
+
+	out := make([]byte, total)
+	reader := NewConcatKDF(crypto.SHA256, z, algID, ptyUInfo, ptyVInfo, supPubInfo, supPrivInfo)
+
+	b.ResetTimer()
+	b.SetBytes(int64(total))
+	for i := 0; i < b.N; i++ {
+		_, _ = reader.Read(out)
+	}
+}
+
+func BenchmarkConcatKDF_1k(b *testing.B) {
+	benchmarkKDF(b, 1024)
+}
+
+func BenchmarkConcatKDF_64k(b *testing.B) {
+	benchmarkKDF(b, 65536)
+}
+
+func BenchmarkConcatKDF_1MB(b *testing.B) {
+	benchmarkKDF(b, 1048576)
+}
+
+func BenchmarkConcatKDF_64MB(b *testing.B) {
+	benchmarkKDF(b, 67108864)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/ecdh_es.go

@@ -0,0 +1,51 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"encoding/binary"
+)
+
+// DeriveECDHES derives a shared encryption key using ECDH/ConcatKDF as described in JWE/JWA.
+func DeriveECDHES(alg string, apuData, apvData []byte, priv *ecdsa.PrivateKey, pub *ecdsa.PublicKey, size int) []byte {
+	// algId, partyUInfo, partyVInfo inputs must be prefixed with the length
+	algID := lengthPrefixed([]byte(alg))
+	ptyUInfo := lengthPrefixed(apuData)
+	ptyVInfo := lengthPrefixed(apvData)
+
+	// suppPubInfo is the encoded length of the output size in bits
+	supPubInfo := make([]byte, 4)
+	binary.BigEndian.PutUint32(supPubInfo, uint32(size)*8)
+
+	z, _ := priv.PublicKey.Curve.ScalarMult(pub.X, pub.Y, priv.D.Bytes())
+	reader := NewConcatKDF(crypto.SHA256, z.Bytes(), algID, ptyUInfo, ptyVInfo, supPubInfo, []byte{})
+
+	key := make([]byte, size)
+
+	// Read on the KDF will never fail
+	_, _ = reader.Read(key)
+	return key
+}
+
+func lengthPrefixed(data []byte) []byte {
+	out := make([]byte, len(data)+4)
+	binary.BigEndian.PutUint32(out, uint32(len(data)))
+	copy(out[4:], data)
+	return out
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/ecdh_es_test.go

@@ -0,0 +1,98 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"encoding/base64"
+	"math/big"
+	"testing"
+)
+
+// Example keys from JWA, Appendix C
+var aliceKey = &ecdsa.PrivateKey{
+	PublicKey: ecdsa.PublicKey{
+		Curve: elliptic.P256(),
+		X:     fromBase64Int("gI0GAILBdu7T53akrFmMyGcsF3n5dO7MmwNBHKW5SV0="),
+		Y:     fromBase64Int("SLW_xSffzlPWrHEVI30DHM_4egVwt3NQqeUD7nMFpps="),
+	},
+	D: fromBase64Int("0_NxaRPUMQoAJt50Gz8YiTr8gRTwyEaCumd-MToTmIo="),
+}
+
+var bobKey = &ecdsa.PrivateKey{
+	PublicKey: ecdsa.PublicKey{
+		Curve: elliptic.P256(),
+		X:     fromBase64Int("weNJy2HscCSM6AEDTDg04biOvhFhyyWvOHQfeF_PxMQ="),
+		Y:     fromBase64Int("e8lnCO-AlStT-NJVX-crhB7QRYhiix03illJOVAOyck="),
+	},
+	D: fromBase64Int("VEmDZpDXXK8p8N0Cndsxs924q6nS1RXFASRl6BfUqdw="),
+}
+
+// Build big int from base64-encoded string. Strips whitespace (for testing).
+func fromBase64Int(data string) *big.Int {
+	val, err := base64.URLEncoding.DecodeString(data)
+	if err != nil {
+		panic("Invalid test data")
+	}
+	return new(big.Int).SetBytes(val)
+}
+
+func TestVectorECDHES(t *testing.T) {
+	apuData := []byte("Alice")
+	apvData := []byte("Bob")
+
+	expected := []byte{
+		86, 170, 141, 234, 248, 35, 109, 32, 92, 34, 40, 205, 113, 167, 16, 26}
+
+	output := DeriveECDHES("A128GCM", apuData, apvData, bobKey, &aliceKey.PublicKey, 16)
+
+	if bytes.Compare(output, expected) != 0 {
+		t.Error("output did not match what we expect, got", output, "wanted", expected)
+	}
+}
+
+func BenchmarkECDHES_128(b *testing.B) {
+	apuData := []byte("APU")
+	apvData := []byte("APV")
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		DeriveECDHES("ID", apuData, apvData, bobKey, &aliceKey.PublicKey, 16)
+	}
+}
+
+func BenchmarkECDHES_192(b *testing.B) {
+	apuData := []byte("APU")
+	apvData := []byte("APV")
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		DeriveECDHES("ID", apuData, apvData, bobKey, &aliceKey.PublicKey, 24)
+	}
+}
+
+func BenchmarkECDHES_256(b *testing.B) {
+	apuData := []byte("APU")
+	apvData := []byte("APV")
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		DeriveECDHES("ID", apuData, apvData, bobKey, &aliceKey.PublicKey, 32)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/key_wrap.go

@@ -0,0 +1,109 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"crypto/cipher"
+	"crypto/subtle"
+	"encoding/binary"
+	"errors"
+)
+
+var defaultIV = []byte{0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6}
+
+// KeyWrap implements NIST key wrapping; it wraps a content encryption key (cek) with the given block cipher.
+func KeyWrap(block cipher.Block, cek []byte) ([]byte, error) {
+	if len(cek)%8 != 0 {
+		return nil, errors.New("square/go-jose: key wrap input must be 8 byte blocks")
+	}
+
+	n := len(cek) / 8
+	r := make([][]byte, n)
+
+	for i := range r {
+		r[i] = make([]byte, 8)
+		copy(r[i], cek[i*8:])
+	}
+
+	buffer := make([]byte, 16)
+	tBytes := make([]byte, 8)
+	copy(buffer, defaultIV)
+
+	for t := 0; t < 6*n; t++ {
+		copy(buffer[8:], r[t%n])
+
+		block.Encrypt(buffer, buffer)
+
+		binary.BigEndian.PutUint64(tBytes, uint64(t+1))
+
+		for i := 0; i < 8; i++ {
+			buffer[i] = buffer[i] ^ tBytes[i]
+		}
+		copy(r[t%n], buffer[8:])
+	}
+
+	out := make([]byte, (n+1)*8)
+	copy(out, buffer[:8])
+	for i := range r {
+		copy(out[(i+1)*8:], r[i])
+	}
+
+	return out, nil
+}
+
+// KeyUnwrap implements NIST key unwrapping; it unwraps a content encryption key (cek) with the given block cipher.
+func KeyUnwrap(block cipher.Block, ciphertext []byte) ([]byte, error) {
+	if len(ciphertext)%8 != 0 {
+		return nil, errors.New("square/go-jose: key wrap input must be 8 byte blocks")
+	}
+
+	n := (len(ciphertext) / 8) - 1
+	r := make([][]byte, n)
+
+	for i := range r {
+		r[i] = make([]byte, 8)
+		copy(r[i], ciphertext[(i+1)*8:])
+	}
+
+	buffer := make([]byte, 16)
+	tBytes := make([]byte, 8)
+	copy(buffer[:8], ciphertext[:8])
+
+	for t := 6*n - 1; t >= 0; t-- {
+		binary.BigEndian.PutUint64(tBytes, uint64(t+1))
+
+		for i := 0; i < 8; i++ {
+			buffer[i] = buffer[i] ^ tBytes[i]
+		}
+		copy(buffer[8:], r[t%n])
+
+		block.Decrypt(buffer, buffer)
+
+		copy(r[t%n], buffer[8:])
+	}
+
+	if subtle.ConstantTimeCompare(buffer[:8], defaultIV) == 0 {
+		return nil, errors.New("square/go-jose: failed to unwrap key")
+	}
+
+	out := make([]byte, n*8)
+	for i := range r {
+		copy(out[i*8:], r[i])
+	}
+
+	return out, nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/cipher/key_wrap_test.go

@@ -0,0 +1,133 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package josecipher
+
+import (
+	"bytes"
+	"crypto/aes"
+	"encoding/hex"
+	"testing"
+)
+
+func TestAesKeyWrap(t *testing.T) {
+	// Test vectors from: http://csrc.nist.gov/groups/ST/toolkit/documents/kms/key-wrap.pdf
+	kek0, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
+	cek0, _ := hex.DecodeString("00112233445566778899AABBCCDDEEFF")
+
+	expected0, _ := hex.DecodeString("1FA68B0A8112B447AEF34BD8FB5A7B829D3E862371D2CFE5")
+
+	kek1, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F1011121314151617")
+	cek1, _ := hex.DecodeString("00112233445566778899AABBCCDDEEFF")
+
+	expected1, _ := hex.DecodeString("96778B25AE6CA435F92B5B97C050AED2468AB8A17AD84E5D")
+
+	kek2, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F")
+	cek2, _ := hex.DecodeString("00112233445566778899AABBCCDDEEFF0001020304050607")
+
+	expected2, _ := hex.DecodeString("A8F9BC1612C68B3FF6E6F4FBE30E71E4769C8B80A32CB8958CD5D17D6B254DA1")
+
+	block0, _ := aes.NewCipher(kek0)
+	block1, _ := aes.NewCipher(kek1)
+	block2, _ := aes.NewCipher(kek2)
+
+	out0, _ := KeyWrap(block0, cek0)
+	out1, _ := KeyWrap(block1, cek1)
+	out2, _ := KeyWrap(block2, cek2)
+
+	if bytes.Compare(out0, expected0) != 0 {
+		t.Error("output 0 not as expected, got", out0, "wanted", expected0)
+	}
+
+	if bytes.Compare(out1, expected1) != 0 {
+		t.Error("output 1 not as expected, got", out1, "wanted", expected1)
+	}
+
+	if bytes.Compare(out2, expected2) != 0 {
+		t.Error("output 2 not as expected, got", out2, "wanted", expected2)
+	}
+
+	unwrap0, _ := KeyUnwrap(block0, out0)
+	unwrap1, _ := KeyUnwrap(block1, out1)
+	unwrap2, _ := KeyUnwrap(block2, out2)
+
+	if bytes.Compare(unwrap0, cek0) != 0 {
+		t.Error("key unwrap did not return original input, got", unwrap0, "wanted", cek0)
+	}
+
+	if bytes.Compare(unwrap1, cek1) != 0 {
+		t.Error("key unwrap did not return original input, got", unwrap1, "wanted", cek1)
+	}
+
+	if bytes.Compare(unwrap2, cek2) != 0 {
+		t.Error("key unwrap did not return original input, got", unwrap2, "wanted", cek2)
+	}
+}
+
+func TestAesKeyWrapInvalid(t *testing.T) {
+	kek, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
+
+	// Invalid unwrap input (bit flipped)
+	input0, _ := hex.DecodeString("1EA68C1A8112B447AEF34BD8FB5A7B828D3E862371D2CFE5")
+
+	block, _ := aes.NewCipher(kek)
+
+	_, err := KeyUnwrap(block, input0)
+	if err == nil {
+		t.Error("key unwrap failed to detect invalid input")
+	}
+
+	// Invalid unwrap input (truncated)
+	input1, _ := hex.DecodeString("1EA68C1A8112B447AEF34BD8FB5A7B828D3E862371D2CF")
+
+	_, err = KeyUnwrap(block, input1)
+	if err == nil {
+		t.Error("key unwrap failed to detect truncated input")
+	}
+
+	// Invalid wrap input (not multiple of 8)
+	input2, _ := hex.DecodeString("0123456789ABCD")
+
+	_, err = KeyWrap(block, input2)
+	if err == nil {
+		t.Error("key wrap accepted invalid input")
+	}
+
+}
+
+func BenchmarkAesKeyWrap(b *testing.B) {
+	kek, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
+	key, _ := hex.DecodeString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF")
+
+	block, _ := aes.NewCipher(kek)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		KeyWrap(block, key)
+	}
+}
+
+func BenchmarkAesKeyUnwrap(b *testing.B) {
+	kek, _ := hex.DecodeString("000102030405060708090A0B0C0D0E0F")
+	input, _ := hex.DecodeString("1FA68B0A8112B447AEF34BD8FB5A7B829D3E862371D2CFE5")
+
+	block, _ := aes.NewCipher(kek)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		KeyUnwrap(block, input)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/crypter.go

@@ -0,0 +1,349 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"fmt"
+	"reflect"
+)
+
+// Encrypter represents an encrypter which produces an encrypted JWE object.
+type Encrypter interface {
+	Encrypt(plaintext []byte) (*JsonWebEncryption, error)
+	EncryptWithAuthData(plaintext []byte, aad []byte) (*JsonWebEncryption, error)
+	SetCompression(alg CompressionAlgorithm)
+}
+
+// MultiEncrypter represents an encrypter which supports multiple recipients.
+type MultiEncrypter interface {
+	Encrypt(plaintext []byte) (*JsonWebEncryption, error)
+	EncryptWithAuthData(plaintext []byte, aad []byte) (*JsonWebEncryption, error)
+	SetCompression(alg CompressionAlgorithm)
+	AddRecipient(alg KeyAlgorithm, encryptionKey interface{}) error
+}
+
+// A generic content cipher
+type contentCipher interface {
+	keySize() int
+	encrypt(cek []byte, aad, plaintext []byte) (*aeadParts, error)
+	decrypt(cek []byte, aad []byte, parts *aeadParts) ([]byte, error)
+}
+
+// A key generator (for generating/getting a CEK)
+type keyGenerator interface {
+	keySize() int
+	genKey() ([]byte, rawHeader, error)
+}
+
+// A generic key encrypter
+type keyEncrypter interface {
+	encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) // Encrypt a key
+}
+
+// A generic key decrypter
+type keyDecrypter interface {
+	decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) // Decrypt a key
+}
+
+// A generic encrypter based on the given key encrypter and content cipher.
+type genericEncrypter struct {
+	contentAlg     ContentEncryption
+	compressionAlg CompressionAlgorithm
+	cipher         contentCipher
+	recipients     []recipientKeyInfo
+	keyGenerator   keyGenerator
+}
+
+type recipientKeyInfo struct {
+	keyID        string
+	keyAlg       KeyAlgorithm
+	keyEncrypter keyEncrypter
+}
+
+// SetCompression sets a compression algorithm to be applied before encryption.
+func (ctx *genericEncrypter) SetCompression(compressionAlg CompressionAlgorithm) {
+	ctx.compressionAlg = compressionAlg
+}
+
+// NewEncrypter creates an appropriate encrypter based on the key type
+func NewEncrypter(alg KeyAlgorithm, enc ContentEncryption, encryptionKey interface{}) (Encrypter, error) {
+	encrypter := &genericEncrypter{
+		contentAlg:     enc,
+		compressionAlg: NONE,
+		recipients:     []recipientKeyInfo{},
+		cipher:         getContentCipher(enc),
+	}
+
+	if encrypter.cipher == nil {
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	var keyID string
+	var rawKey interface{}
+	switch encryptionKey := encryptionKey.(type) {
+	case *JsonWebKey:
+		keyID = encryptionKey.KeyID
+		rawKey = encryptionKey.Key
+	default:
+		rawKey = encryptionKey
+	}
+
+	switch alg {
+	case DIRECT:
+		// Direct encryption mode must be treated differently
+		if reflect.TypeOf(rawKey) != reflect.TypeOf([]byte{}) {
+			return nil, ErrUnsupportedKeyType
+		}
+		encrypter.keyGenerator = staticKeyGenerator{
+			key: rawKey.([]byte),
+		}
+		recipient, _ := newSymmetricRecipient(alg, rawKey.([]byte))
+		if keyID != "" {
+			recipient.keyID = keyID
+		}
+		encrypter.recipients = []recipientKeyInfo{recipient}
+		return encrypter, nil
+	case ECDH_ES:
+		// ECDH-ES (w/o key wrapping) is similar to DIRECT mode
+		typeOf := reflect.TypeOf(rawKey)
+		if typeOf != reflect.TypeOf(&ecdsa.PublicKey{}) {
+			return nil, ErrUnsupportedKeyType
+		}
+		encrypter.keyGenerator = ecKeyGenerator{
+			size:      encrypter.cipher.keySize(),
+			algID:     string(enc),
+			publicKey: rawKey.(*ecdsa.PublicKey),
+		}
+		recipient, _ := newECDHRecipient(alg, rawKey.(*ecdsa.PublicKey))
+		if keyID != "" {
+			recipient.keyID = keyID
+		}
+		encrypter.recipients = []recipientKeyInfo{recipient}
+		return encrypter, nil
+	default:
+		// Can just add a standard recipient
+		encrypter.keyGenerator = randomKeyGenerator{
+			size: encrypter.cipher.keySize(),
+		}
+		err := encrypter.AddRecipient(alg, encryptionKey)
+		return encrypter, err
+	}
+}
+
+// NewMultiEncrypter creates a multi-encrypter based on the given parameters
+func NewMultiEncrypter(enc ContentEncryption) (MultiEncrypter, error) {
+	cipher := getContentCipher(enc)
+
+	if cipher == nil {
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	encrypter := &genericEncrypter{
+		contentAlg:     enc,
+		compressionAlg: NONE,
+		recipients:     []recipientKeyInfo{},
+		cipher:         cipher,
+		keyGenerator: randomKeyGenerator{
+			size: cipher.keySize(),
+		},
+	}
+
+	return encrypter, nil
+}
+
+func (ctx *genericEncrypter) AddRecipient(alg KeyAlgorithm, encryptionKey interface{}) (err error) {
+	var recipient recipientKeyInfo
+
+	switch alg {
+	case DIRECT, ECDH_ES:
+		return fmt.Errorf("square/go-jose: key algorithm '%s' not supported in multi-recipient mode", alg)
+	}
+
+	recipient, err = makeJWERecipient(alg, encryptionKey)
+
+	if err == nil {
+		ctx.recipients = append(ctx.recipients, recipient)
+	}
+	return err
+}
+
+func makeJWERecipient(alg KeyAlgorithm, encryptionKey interface{}) (recipientKeyInfo, error) {
+	switch encryptionKey := encryptionKey.(type) {
+	case *rsa.PublicKey:
+		return newRSARecipient(alg, encryptionKey)
+	case *ecdsa.PublicKey:
+		return newECDHRecipient(alg, encryptionKey)
+	case []byte:
+		return newSymmetricRecipient(alg, encryptionKey)
+	case *JsonWebKey:
+		recipient, err := makeJWERecipient(alg, encryptionKey.Key)
+		if err == nil && encryptionKey.KeyID != "" {
+			recipient.keyID = encryptionKey.KeyID
+		}
+		return recipient, err
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedKeyType
+	}
+}
+
+// newDecrypter creates an appropriate decrypter based on the key type
+func newDecrypter(decryptionKey interface{}) (keyDecrypter, error) {
+	switch decryptionKey := decryptionKey.(type) {
+	case *rsa.PrivateKey:
+		return &rsaDecrypterSigner{
+			privateKey: decryptionKey,
+		}, nil
+	case *ecdsa.PrivateKey:
+		return &ecDecrypterSigner{
+			privateKey: decryptionKey,
+		}, nil
+	case []byte:
+		return &symmetricKeyCipher{
+			key: decryptionKey,
+		}, nil
+	case *JsonWebKey:
+		return newDecrypter(decryptionKey.Key)
+	default:
+		return nil, ErrUnsupportedKeyType
+	}
+}
+
+// Implementation of encrypt method producing a JWE object.
+func (ctx *genericEncrypter) Encrypt(plaintext []byte) (*JsonWebEncryption, error) {
+	return ctx.EncryptWithAuthData(plaintext, nil)
+}
+
+// Implementation of encrypt method producing a JWE object.
+func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JsonWebEncryption, error) {
+	obj := &JsonWebEncryption{}
+	obj.aad = aad
+
+	obj.protected = &rawHeader{
+		Enc: ctx.contentAlg,
+	}
+	obj.recipients = make([]recipientInfo, len(ctx.recipients))
+
+	if len(ctx.recipients) == 0 {
+		return nil, fmt.Errorf("square/go-jose: no recipients to encrypt to")
+	}
+
+	cek, headers, err := ctx.keyGenerator.genKey()
+	if err != nil {
+		return nil, err
+	}
+
+	obj.protected.merge(&headers)
+
+	for i, info := range ctx.recipients {
+		recipient, err := info.keyEncrypter.encryptKey(cek, info.keyAlg)
+		if err != nil {
+			return nil, err
+		}
+
+		recipient.header.Alg = string(info.keyAlg)
+		if info.keyID != "" {
+			recipient.header.Kid = info.keyID
+		}
+		obj.recipients[i] = recipient
+	}
+
+	if len(ctx.recipients) == 1 {
+		// Move per-recipient headers into main protected header if there's
+		// only a single recipient.
+		obj.protected.merge(obj.recipients[0].header)
+		obj.recipients[0].header = nil
+	}
+
+	if ctx.compressionAlg != NONE {
+		plaintext, err = compress(ctx.compressionAlg, plaintext)
+		if err != nil {
+			return nil, err
+		}
+
+		obj.protected.Zip = ctx.compressionAlg
+	}
+
+	authData := obj.computeAuthData()
+	parts, err := ctx.cipher.encrypt(cek, authData, plaintext)
+	if err != nil {
+		return nil, err
+	}
+
+	obj.iv = parts.iv
+	obj.ciphertext = parts.ciphertext
+	obj.tag = parts.tag
+
+	return obj, nil
+}
+
+// Decrypt and validate the object and return the plaintext.
+func (obj JsonWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error) {
+	headers := obj.mergedHeaders(nil)
+
+	if len(headers.Crit) > 0 {
+		return nil, fmt.Errorf("square/go-jose: unsupported crit header")
+	}
+
+	decrypter, err := newDecrypter(decryptionKey)
+	if err != nil {
+		return nil, err
+	}
+
+	cipher := getContentCipher(headers.Enc)
+	if cipher == nil {
+		return nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(headers.Enc))
+	}
+
+	generator := randomKeyGenerator{
+		size: cipher.keySize(),
+	}
+
+	parts := &aeadParts{
+		iv:         obj.iv,
+		ciphertext: obj.ciphertext,
+		tag:        obj.tag,
+	}
+
+	authData := obj.computeAuthData()
+
+	var plaintext []byte
+	for _, recipient := range obj.recipients {
+		recipientHeaders := obj.mergedHeaders(&recipient)
+
+		cek, err := decrypter.decryptKey(recipientHeaders, &recipient, generator)
+		if err == nil {
+			// Found a valid CEK -- let's try to decrypt.
+			plaintext, err = cipher.decrypt(cek, authData, parts)
+			if err == nil {
+				break
+			}
+		}
+	}
+
+	if plaintext == nil {
+		return nil, ErrCryptoFailure
+	}
+
+	// The "zip" header paramter may only be present in the protected header.
+	if obj.protected.Zip != "" {
+		plaintext, err = decompress(obj.protected.Zip, plaintext)
+	}
+
+	return plaintext, err
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/crypter_test.go

@@ -0,0 +1,784 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"fmt"
+	"io"
+	"testing"
+)
+
+// We generate only a single RSA and EC key for testing, speeds up tests.
+var rsaTestKey, _ = rsa.GenerateKey(rand.Reader, 2048)
+
+var ecTestKey256, _ = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+var ecTestKey384, _ = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+var ecTestKey521, _ = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
+
+func RoundtripJWE(keyAlg KeyAlgorithm, encAlg ContentEncryption, compressionAlg CompressionAlgorithm, serializer func(*JsonWebEncryption) (string, error), corrupter func(*JsonWebEncryption) bool, aad []byte, encryptionKey interface{}, decryptionKey interface{}) error {
+	enc, err := NewEncrypter(keyAlg, encAlg, encryptionKey)
+	if err != nil {
+		return fmt.Errorf("error on new encrypter: %s", err)
+	}
+
+	enc.SetCompression(compressionAlg)
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	obj, err := enc.EncryptWithAuthData(input, aad)
+	if err != nil {
+		return fmt.Errorf("error in encrypt: %s", err)
+	}
+
+	msg, err := serializer(obj)
+	if err != nil {
+		return fmt.Errorf("error in serializer: %s", err)
+	}
+
+	parsed, err := ParseEncrypted(msg)
+	if err != nil {
+		return fmt.Errorf("error in parse: %s, on msg '%s'", err, msg)
+	}
+
+	// (Maybe) mangle object
+	skip := corrupter(parsed)
+	if skip {
+		return fmt.Errorf("corrupter indicated message should be skipped")
+	}
+
+	if bytes.Compare(parsed.GetAuthData(), aad) != 0 {
+		return fmt.Errorf("auth data in parsed object does not match")
+	}
+
+	output, err := parsed.Decrypt(decryptionKey)
+	if err != nil {
+		return fmt.Errorf("error on decrypt: %s", err)
+	}
+
+	if bytes.Compare(input, output) != 0 {
+		return fmt.Errorf("Decrypted output does not match input, got '%s' but wanted '%s'", output, input)
+	}
+
+	return nil
+}
+
+func TestRoundtripsJWE(t *testing.T) {
+	// Test matrix
+	keyAlgs := []KeyAlgorithm{
+		DIRECT, ECDH_ES, ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW, A128KW, A192KW, A256KW,
+		RSA1_5, RSA_OAEP, RSA_OAEP_256, A128GCMKW, A192GCMKW, A256GCMKW}
+	encAlgs := []ContentEncryption{A128GCM, A192GCM, A256GCM, A128CBC_HS256, A192CBC_HS384, A256CBC_HS512}
+	zipAlgs := []CompressionAlgorithm{NONE, DEFLATE}
+
+	serializers := []func(*JsonWebEncryption) (string, error){
+		func(obj *JsonWebEncryption) (string, error) { return obj.CompactSerialize() },
+		func(obj *JsonWebEncryption) (string, error) { return obj.FullSerialize(), nil },
+	}
+
+	corrupter := func(obj *JsonWebEncryption) bool { return false }
+
+	// Note: can't use AAD with compact serialization
+	aads := [][]byte{
+		nil,
+		[]byte("Ut enim ad minim veniam"),
+	}
+
+	// Test all different configurations
+	for _, alg := range keyAlgs {
+		for _, enc := range encAlgs {
+			for _, key := range generateTestKeys(alg, enc) {
+				for _, zip := range zipAlgs {
+					for i, serializer := range serializers {
+						err := RoundtripJWE(alg, enc, zip, serializer, corrupter, aads[i], key.enc, key.dec)
+						if err != nil {
+							t.Error(err, alg, enc, zip, i)
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestRoundtripsJWECorrupted(t *testing.T) {
+	// Test matrix
+	keyAlgs := []KeyAlgorithm{DIRECT, ECDH_ES, ECDH_ES_A128KW, A128KW, RSA1_5, RSA_OAEP, RSA_OAEP_256, A128GCMKW}
+	encAlgs := []ContentEncryption{A128GCM, A192GCM, A256GCM, A128CBC_HS256, A192CBC_HS384, A256CBC_HS512}
+	zipAlgs := []CompressionAlgorithm{NONE, DEFLATE}
+
+	serializers := []func(*JsonWebEncryption) (string, error){
+		func(obj *JsonWebEncryption) (string, error) { return obj.CompactSerialize() },
+		func(obj *JsonWebEncryption) (string, error) { return obj.FullSerialize(), nil },
+	}
+
+	bitflip := func(slice []byte) bool {
+		if len(slice) > 0 {
+			slice[0] ^= 0xFF
+			return false
+		}
+		return true
+	}
+
+	corrupters := []func(*JsonWebEncryption) bool{
+		func(obj *JsonWebEncryption) bool {
+			// Set invalid ciphertext
+			return bitflip(obj.ciphertext)
+		},
+		func(obj *JsonWebEncryption) bool {
+			// Set invalid auth tag
+			return bitflip(obj.tag)
+		},
+		func(obj *JsonWebEncryption) bool {
+			// Set invalid AAD
+			return bitflip(obj.aad)
+		},
+		func(obj *JsonWebEncryption) bool {
+			// Mess with encrypted key
+			return bitflip(obj.recipients[0].encryptedKey)
+		},
+		func(obj *JsonWebEncryption) bool {
+			// Mess with GCM-KW auth tag
+			return bitflip(obj.protected.Tag.bytes())
+		},
+	}
+
+	// Note: can't use AAD with compact serialization
+	aads := [][]byte{
+		nil,
+		[]byte("Ut enim ad minim veniam"),
+	}
+
+	// Test all different configurations
+	for _, alg := range keyAlgs {
+		for _, enc := range encAlgs {
+			for _, key := range generateTestKeys(alg, enc) {
+				for _, zip := range zipAlgs {
+					for i, serializer := range serializers {
+						for j, corrupter := range corrupters {
+							err := RoundtripJWE(alg, enc, zip, serializer, corrupter, aads[i], key.enc, key.dec)
+							if err == nil {
+								t.Error("failed to detect corrupt data", err, alg, enc, zip, i, j)
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestEncrypterWithJWKAndKeyID(t *testing.T) {
+	enc, err := NewEncrypter(A128KW, A128GCM, &JsonWebKey{
+		KeyID: "test-id",
+		Key:   []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+	})
+	if err != nil {
+		t.Error(err)
+	}
+
+	ciphertext, _ := enc.Encrypt([]byte("Lorem ipsum dolor sit amet"))
+
+	serialized1, _ := ciphertext.CompactSerialize()
+	serialized2 := ciphertext.FullSerialize()
+
+	parsed1, _ := ParseEncrypted(serialized1)
+	parsed2, _ := ParseEncrypted(serialized2)
+
+	if parsed1.Header.KeyID != "test-id" {
+		t.Errorf("expected message to have key id from JWK, but found '%s' instead", parsed1.Header.KeyID)
+	}
+	if parsed2.Header.KeyID != "test-id" {
+		t.Errorf("expected message to have key id from JWK, but found '%s' instead", parsed2.Header.KeyID)
+	}
+}
+
+func TestEncrypterWithBrokenRand(t *testing.T) {
+	keyAlgs := []KeyAlgorithm{ECDH_ES_A128KW, A128KW, RSA1_5, RSA_OAEP, RSA_OAEP_256, A128GCMKW}
+	encAlgs := []ContentEncryption{A128GCM, A192GCM, A256GCM, A128CBC_HS256, A192CBC_HS384, A256CBC_HS512}
+
+	serializer := func(obj *JsonWebEncryption) (string, error) { return obj.CompactSerialize() }
+	corrupter := func(obj *JsonWebEncryption) bool { return false }
+
+	// Break rand reader
+	readers := []func() io.Reader{
+		// Totally broken
+		func() io.Reader { return bytes.NewReader([]byte{}) },
+		// Not enough bytes
+		func() io.Reader { return io.LimitReader(rand.Reader, 20) },
+	}
+
+	defer resetRandReader()
+
+	for _, alg := range keyAlgs {
+		for _, enc := range encAlgs {
+			for _, key := range generateTestKeys(alg, enc) {
+				for i, getReader := range readers {
+					randReader = getReader()
+					err := RoundtripJWE(alg, enc, NONE, serializer, corrupter, nil, key.enc, key.dec)
+					if err == nil {
+						t.Error("encrypter should fail if rand is broken", i)
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestNewEncrypterErrors(t *testing.T) {
+	_, err := NewEncrypter("XYZ", "XYZ", nil)
+	if err == nil {
+		t.Error("was able to instantiate encrypter with invalid cipher")
+	}
+
+	_, err = NewMultiEncrypter("XYZ")
+	if err == nil {
+		t.Error("was able to instantiate multi-encrypter with invalid cipher")
+	}
+
+	_, err = NewEncrypter(DIRECT, A128GCM, nil)
+	if err == nil {
+		t.Error("was able to instantiate encrypter with invalid direct key")
+	}
+
+	_, err = NewEncrypter(ECDH_ES, A128GCM, nil)
+	if err == nil {
+		t.Error("was able to instantiate encrypter with invalid EC key")
+	}
+}
+
+func TestMultiRecipientJWE(t *testing.T) {
+	enc, err := NewMultiEncrypter(A128GCM)
+	if err != nil {
+		panic(err)
+	}
+
+	err = enc.AddRecipient(RSA_OAEP, &rsaTestKey.PublicKey)
+	if err != nil {
+		t.Error("error when adding RSA recipient", err)
+	}
+
+	sharedKey := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+	}
+
+	err = enc.AddRecipient(A256GCMKW, sharedKey)
+	if err != nil {
+		t.Error("error when adding AES recipient: ", err)
+		return
+	}
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	obj, err := enc.Encrypt(input)
+	if err != nil {
+		t.Error("error in encrypt: ", err)
+		return
+	}
+
+	msg := obj.FullSerialize()
+
+	parsed, err := ParseEncrypted(msg)
+	if err != nil {
+		t.Error("error in parse: ", err)
+		return
+	}
+
+	output, err := parsed.Decrypt(rsaTestKey)
+	if err != nil {
+		t.Error("error on decrypt with RSA: ", err)
+		return
+	}
+
+	if bytes.Compare(input, output) != 0 {
+		t.Error("Decrypted output does not match input: ", output, input)
+		return
+	}
+
+	output, err = parsed.Decrypt(sharedKey)
+	if err != nil {
+		t.Error("error on decrypt with AES: ", err)
+		return
+	}
+
+	if bytes.Compare(input, output) != 0 {
+		t.Error("Decrypted output does not match input", output, input)
+		return
+	}
+}
+
+func TestMultiRecipientErrors(t *testing.T) {
+	enc, err := NewMultiEncrypter(A128GCM)
+	if err != nil {
+		panic(err)
+	}
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	_, err = enc.Encrypt(input)
+	if err == nil {
+		t.Error("should fail when encrypting to zero recipients")
+	}
+
+	err = enc.AddRecipient(DIRECT, nil)
+	if err == nil {
+		t.Error("should reject DIRECT mode when encrypting to multiple recipients")
+	}
+
+	err = enc.AddRecipient(ECDH_ES, nil)
+	if err == nil {
+		t.Error("should reject ECDH_ES mode when encrypting to multiple recipients")
+	}
+
+	err = enc.AddRecipient(RSA1_5, nil)
+	if err == nil {
+		t.Error("should reject invalid recipient key")
+	}
+}
+
+type testKey struct {
+	enc, dec interface{}
+}
+
+func symmetricTestKey(size int) []testKey {
+	key, _, _ := randomKeyGenerator{size: size}.genKey()
+
+	return []testKey{
+		testKey{
+			enc: key,
+			dec: key,
+		},
+		testKey{
+			enc: &JsonWebKey{KeyID: "test", Key: key},
+			dec: &JsonWebKey{KeyID: "test", Key: key},
+		},
+	}
+}
+
+func generateTestKeys(keyAlg KeyAlgorithm, encAlg ContentEncryption) []testKey {
+	switch keyAlg {
+	case DIRECT:
+		return symmetricTestKey(getContentCipher(encAlg).keySize())
+	case ECDH_ES, ECDH_ES_A128KW, ECDH_ES_A192KW, ECDH_ES_A256KW:
+		return []testKey{
+			testKey{
+				dec: ecTestKey256,
+				enc: &ecTestKey256.PublicKey,
+			},
+			testKey{
+				dec: ecTestKey384,
+				enc: &ecTestKey384.PublicKey,
+			},
+			testKey{
+				dec: ecTestKey521,
+				enc: &ecTestKey521.PublicKey,
+			},
+			testKey{
+				dec: &JsonWebKey{KeyID: "test", Key: ecTestKey256},
+				enc: &JsonWebKey{KeyID: "test", Key: &ecTestKey256.PublicKey},
+			},
+		}
+	case A128GCMKW, A128KW:
+		return symmetricTestKey(16)
+	case A192GCMKW, A192KW:
+		return symmetricTestKey(24)
+	case A256GCMKW, A256KW:
+		return symmetricTestKey(32)
+	case RSA1_5, RSA_OAEP, RSA_OAEP_256:
+		return []testKey{testKey{
+			dec: rsaTestKey,
+			enc: &rsaTestKey.PublicKey,
+		}}
+	}
+
+	panic("Must update test case")
+}
+
+func RunRoundtripsJWE(b *testing.B, alg KeyAlgorithm, enc ContentEncryption, zip CompressionAlgorithm, priv, pub interface{}) {
+	serializer := func(obj *JsonWebEncryption) (string, error) {
+		return obj.CompactSerialize()
+	}
+
+	corrupter := func(obj *JsonWebEncryption) bool { return false }
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		err := RoundtripJWE(alg, enc, zip, serializer, corrupter, nil, pub, priv)
+		if err != nil {
+			b.Error(err)
+		}
+	}
+}
+
+var (
+	chunks = map[string][]byte{
+		"1B":   make([]byte, 1),
+		"64B":  make([]byte, 64),
+		"1KB":  make([]byte, 1024),
+		"64KB": make([]byte, 65536),
+		"1MB":  make([]byte, 1048576),
+		"64MB": make([]byte, 67108864),
+	}
+
+	symKey, _, _ = randomKeyGenerator{size: 32}.genKey()
+
+	encrypters = map[string]Encrypter{
+		"OAEPAndGCM":          mustEncrypter(RSA_OAEP, A128GCM, &rsaTestKey.PublicKey),
+		"PKCSAndGCM":          mustEncrypter(RSA1_5, A128GCM, &rsaTestKey.PublicKey),
+		"OAEPAndCBC":          mustEncrypter(RSA_OAEP, A128CBC_HS256, &rsaTestKey.PublicKey),
+		"PKCSAndCBC":          mustEncrypter(RSA1_5, A128CBC_HS256, &rsaTestKey.PublicKey),
+		"DirectGCM128":        mustEncrypter(DIRECT, A128GCM, symKey),
+		"DirectCBC128":        mustEncrypter(DIRECT, A128CBC_HS256, symKey),
+		"DirectGCM256":        mustEncrypter(DIRECT, A256GCM, symKey),
+		"DirectCBC256":        mustEncrypter(DIRECT, A256CBC_HS512, symKey),
+		"AESKWAndGCM128":      mustEncrypter(A128KW, A128GCM, symKey),
+		"AESKWAndCBC256":      mustEncrypter(A256KW, A256GCM, symKey),
+		"ECDHOnP256AndGCM128": mustEncrypter(ECDH_ES, A128GCM, &ecTestKey256.PublicKey),
+		"ECDHOnP384AndGCM128": mustEncrypter(ECDH_ES, A128GCM, &ecTestKey384.PublicKey),
+		"ECDHOnP521AndGCM128": mustEncrypter(ECDH_ES, A128GCM, &ecTestKey521.PublicKey),
+	}
+)
+
+func BenchmarkEncrypt1BWithOAEPAndGCM(b *testing.B)   { benchEncrypt("1B", "OAEPAndGCM", b) }
+func BenchmarkEncrypt64BWithOAEPAndGCM(b *testing.B)  { benchEncrypt("64B", "OAEPAndGCM", b) }
+func BenchmarkEncrypt1KBWithOAEPAndGCM(b *testing.B)  { benchEncrypt("1KB", "OAEPAndGCM", b) }
+func BenchmarkEncrypt64KBWithOAEPAndGCM(b *testing.B) { benchEncrypt("64KB", "OAEPAndGCM", b) }
+func BenchmarkEncrypt1MBWithOAEPAndGCM(b *testing.B)  { benchEncrypt("1MB", "OAEPAndGCM", b) }
+func BenchmarkEncrypt64MBWithOAEPAndGCM(b *testing.B) { benchEncrypt("64MB", "OAEPAndGCM", b) }
+
+func BenchmarkEncrypt1BWithPKCSAndGCM(b *testing.B)   { benchEncrypt("1B", "PKCSAndGCM", b) }
+func BenchmarkEncrypt64BWithPKCSAndGCM(b *testing.B)  { benchEncrypt("64B", "PKCSAndGCM", b) }
+func BenchmarkEncrypt1KBWithPKCSAndGCM(b *testing.B)  { benchEncrypt("1KB", "PKCSAndGCM", b) }
+func BenchmarkEncrypt64KBWithPKCSAndGCM(b *testing.B) { benchEncrypt("64KB", "PKCSAndGCM", b) }
+func BenchmarkEncrypt1MBWithPKCSAndGCM(b *testing.B)  { benchEncrypt("1MB", "PKCSAndGCM", b) }
+func BenchmarkEncrypt64MBWithPKCSAndGCM(b *testing.B) { benchEncrypt("64MB", "PKCSAndGCM", b) }
+
+func BenchmarkEncrypt1BWithOAEPAndCBC(b *testing.B)   { benchEncrypt("1B", "OAEPAndCBC", b) }
+func BenchmarkEncrypt64BWithOAEPAndCBC(b *testing.B)  { benchEncrypt("64B", "OAEPAndCBC", b) }
+func BenchmarkEncrypt1KBWithOAEPAndCBC(b *testing.B)  { benchEncrypt("1KB", "OAEPAndCBC", b) }
+func BenchmarkEncrypt64KBWithOAEPAndCBC(b *testing.B) { benchEncrypt("64KB", "OAEPAndCBC", b) }
+func BenchmarkEncrypt1MBWithOAEPAndCBC(b *testing.B)  { benchEncrypt("1MB", "OAEPAndCBC", b) }
+func BenchmarkEncrypt64MBWithOAEPAndCBC(b *testing.B) { benchEncrypt("64MB", "OAEPAndCBC", b) }
+
+func BenchmarkEncrypt1BWithPKCSAndCBC(b *testing.B)   { benchEncrypt("1B", "PKCSAndCBC", b) }
+func BenchmarkEncrypt64BWithPKCSAndCBC(b *testing.B)  { benchEncrypt("64B", "PKCSAndCBC", b) }
+func BenchmarkEncrypt1KBWithPKCSAndCBC(b *testing.B)  { benchEncrypt("1KB", "PKCSAndCBC", b) }
+func BenchmarkEncrypt64KBWithPKCSAndCBC(b *testing.B) { benchEncrypt("64KB", "PKCSAndCBC", b) }
+func BenchmarkEncrypt1MBWithPKCSAndCBC(b *testing.B)  { benchEncrypt("1MB", "PKCSAndCBC", b) }
+func BenchmarkEncrypt64MBWithPKCSAndCBC(b *testing.B) { benchEncrypt("64MB", "PKCSAndCBC", b) }
+
+func BenchmarkEncrypt1BWithDirectGCM128(b *testing.B)   { benchEncrypt("1B", "DirectGCM128", b) }
+func BenchmarkEncrypt64BWithDirectGCM128(b *testing.B)  { benchEncrypt("64B", "DirectGCM128", b) }
+func BenchmarkEncrypt1KBWithDirectGCM128(b *testing.B)  { benchEncrypt("1KB", "DirectGCM128", b) }
+func BenchmarkEncrypt64KBWithDirectGCM128(b *testing.B) { benchEncrypt("64KB", "DirectGCM128", b) }
+func BenchmarkEncrypt1MBWithDirectGCM128(b *testing.B)  { benchEncrypt("1MB", "DirectGCM128", b) }
+func BenchmarkEncrypt64MBWithDirectGCM128(b *testing.B) { benchEncrypt("64MB", "DirectGCM128", b) }
+
+func BenchmarkEncrypt1BWithDirectCBC128(b *testing.B)   { benchEncrypt("1B", "DirectCBC128", b) }
+func BenchmarkEncrypt64BWithDirectCBC128(b *testing.B)  { benchEncrypt("64B", "DirectCBC128", b) }
+func BenchmarkEncrypt1KBWithDirectCBC128(b *testing.B)  { benchEncrypt("1KB", "DirectCBC128", b) }
+func BenchmarkEncrypt64KBWithDirectCBC128(b *testing.B) { benchEncrypt("64KB", "DirectCBC128", b) }
+func BenchmarkEncrypt1MBWithDirectCBC128(b *testing.B)  { benchEncrypt("1MB", "DirectCBC128", b) }
+func BenchmarkEncrypt64MBWithDirectCBC128(b *testing.B) { benchEncrypt("64MB", "DirectCBC128", b) }
+
+func BenchmarkEncrypt1BWithDirectGCM256(b *testing.B)   { benchEncrypt("1B", "DirectGCM256", b) }
+func BenchmarkEncrypt64BWithDirectGCM256(b *testing.B)  { benchEncrypt("64B", "DirectGCM256", b) }
+func BenchmarkEncrypt1KBWithDirectGCM256(b *testing.B)  { benchEncrypt("1KB", "DirectGCM256", b) }
+func BenchmarkEncrypt64KBWithDirectGCM256(b *testing.B) { benchEncrypt("64KB", "DirectGCM256", b) }
+func BenchmarkEncrypt1MBWithDirectGCM256(b *testing.B)  { benchEncrypt("1MB", "DirectGCM256", b) }
+func BenchmarkEncrypt64MBWithDirectGCM256(b *testing.B) { benchEncrypt("64MB", "DirectGCM256", b) }
+
+func BenchmarkEncrypt1BWithDirectCBC256(b *testing.B)   { benchEncrypt("1B", "DirectCBC256", b) }
+func BenchmarkEncrypt64BWithDirectCBC256(b *testing.B)  { benchEncrypt("64B", "DirectCBC256", b) }
+func BenchmarkEncrypt1KBWithDirectCBC256(b *testing.B)  { benchEncrypt("1KB", "DirectCBC256", b) }
+func BenchmarkEncrypt64KBWithDirectCBC256(b *testing.B) { benchEncrypt("64KB", "DirectCBC256", b) }
+func BenchmarkEncrypt1MBWithDirectCBC256(b *testing.B)  { benchEncrypt("1MB", "DirectCBC256", b) }
+func BenchmarkEncrypt64MBWithDirectCBC256(b *testing.B) { benchEncrypt("64MB", "DirectCBC256", b) }
+
+func BenchmarkEncrypt1BWithAESKWAndGCM128(b *testing.B)   { benchEncrypt("1B", "AESKWAndGCM128", b) }
+func BenchmarkEncrypt64BWithAESKWAndGCM128(b *testing.B)  { benchEncrypt("64B", "AESKWAndGCM128", b) }
+func BenchmarkEncrypt1KBWithAESKWAndGCM128(b *testing.B)  { benchEncrypt("1KB", "AESKWAndGCM128", b) }
+func BenchmarkEncrypt64KBWithAESKWAndGCM128(b *testing.B) { benchEncrypt("64KB", "AESKWAndGCM128", b) }
+func BenchmarkEncrypt1MBWithAESKWAndGCM128(b *testing.B)  { benchEncrypt("1MB", "AESKWAndGCM128", b) }
+func BenchmarkEncrypt64MBWithAESKWAndGCM128(b *testing.B) { benchEncrypt("64MB", "AESKWAndGCM128", b) }
+
+func BenchmarkEncrypt1BWithAESKWAndCBC256(b *testing.B)   { benchEncrypt("1B", "AESKWAndCBC256", b) }
+func BenchmarkEncrypt64BWithAESKWAndCBC256(b *testing.B)  { benchEncrypt("64B", "AESKWAndCBC256", b) }
+func BenchmarkEncrypt1KBWithAESKWAndCBC256(b *testing.B)  { benchEncrypt("1KB", "AESKWAndCBC256", b) }
+func BenchmarkEncrypt64KBWithAESKWAndCBC256(b *testing.B) { benchEncrypt("64KB", "AESKWAndCBC256", b) }
+func BenchmarkEncrypt1MBWithAESKWAndCBC256(b *testing.B)  { benchEncrypt("1MB", "AESKWAndCBC256", b) }
+func BenchmarkEncrypt64MBWithAESKWAndCBC256(b *testing.B) { benchEncrypt("64MB", "AESKWAndCBC256", b) }
+
+func BenchmarkEncrypt1BWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("1B", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkEncrypt64BWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("64B", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkEncrypt1KBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("1KB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkEncrypt64KBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("64KB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkEncrypt1MBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("1MB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkEncrypt64MBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchEncrypt("64MB", "ECDHOnP256AndGCM128", b)
+}
+
+func BenchmarkEncrypt1BWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("1B", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkEncrypt64BWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("64B", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkEncrypt1KBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("1KB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkEncrypt64KBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("64KB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkEncrypt1MBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("1MB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkEncrypt64MBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchEncrypt("64MB", "ECDHOnP384AndGCM128", b)
+}
+
+func BenchmarkEncrypt1BWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("1B", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkEncrypt64BWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("64B", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkEncrypt1KBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("1KB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkEncrypt64KBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("64KB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkEncrypt1MBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("1MB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkEncrypt64MBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchEncrypt("64MB", "ECDHOnP521AndGCM128", b)
+}
+
+func benchEncrypt(chunkKey, primKey string, b *testing.B) {
+	data, ok := chunks[chunkKey]
+	if !ok {
+		b.Fatalf("unknown chunk size %s", chunkKey)
+	}
+
+	enc, ok := encrypters[primKey]
+	if !ok {
+		b.Fatalf("unknown encrypter %s", primKey)
+	}
+
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		enc.Encrypt(data)
+	}
+}
+
+var (
+	decryptionKeys = map[string]interface{}{
+		"OAEPAndGCM": rsaTestKey,
+		"PKCSAndGCM": rsaTestKey,
+		"OAEPAndCBC": rsaTestKey,
+		"PKCSAndCBC": rsaTestKey,
+
+		"DirectGCM128": symKey,
+		"DirectCBC128": symKey,
+		"DirectGCM256": symKey,
+		"DirectCBC256": symKey,
+
+		"AESKWAndGCM128": symKey,
+		"AESKWAndCBC256": symKey,
+
+		"ECDHOnP256AndGCM128": ecTestKey256,
+		"ECDHOnP384AndGCM128": ecTestKey384,
+		"ECDHOnP521AndGCM128": ecTestKey521,
+	}
+)
+
+func BenchmarkDecrypt1BWithOAEPAndGCM(b *testing.B)   { benchDecrypt("1B", "OAEPAndGCM", b) }
+func BenchmarkDecrypt64BWithOAEPAndGCM(b *testing.B)  { benchDecrypt("64B", "OAEPAndGCM", b) }
+func BenchmarkDecrypt1KBWithOAEPAndGCM(b *testing.B)  { benchDecrypt("1KB", "OAEPAndGCM", b) }
+func BenchmarkDecrypt64KBWithOAEPAndGCM(b *testing.B) { benchDecrypt("64KB", "OAEPAndGCM", b) }
+func BenchmarkDecrypt1MBWithOAEPAndGCM(b *testing.B)  { benchDecrypt("1MB", "OAEPAndGCM", b) }
+func BenchmarkDecrypt64MBWithOAEPAndGCM(b *testing.B) { benchDecrypt("64MB", "OAEPAndGCM", b) }
+
+func BenchmarkDecrypt1BWithPKCSAndGCM(b *testing.B)   { benchDecrypt("1B", "PKCSAndGCM", b) }
+func BenchmarkDecrypt64BWithPKCSAndGCM(b *testing.B)  { benchDecrypt("64B", "PKCSAndGCM", b) }
+func BenchmarkDecrypt1KBWithPKCSAndGCM(b *testing.B)  { benchDecrypt("1KB", "PKCSAndGCM", b) }
+func BenchmarkDecrypt64KBWithPKCSAndGCM(b *testing.B) { benchDecrypt("64KB", "PKCSAndGCM", b) }
+func BenchmarkDecrypt1MBWithPKCSAndGCM(b *testing.B)  { benchDecrypt("1MB", "PKCSAndGCM", b) }
+func BenchmarkDecrypt64MBWithPKCSAndGCM(b *testing.B) { benchDecrypt("64MB", "PKCSAndGCM", b) }
+
+func BenchmarkDecrypt1BWithOAEPAndCBC(b *testing.B)   { benchDecrypt("1B", "OAEPAndCBC", b) }
+func BenchmarkDecrypt64BWithOAEPAndCBC(b *testing.B)  { benchDecrypt("64B", "OAEPAndCBC", b) }
+func BenchmarkDecrypt1KBWithOAEPAndCBC(b *testing.B)  { benchDecrypt("1KB", "OAEPAndCBC", b) }
+func BenchmarkDecrypt64KBWithOAEPAndCBC(b *testing.B) { benchDecrypt("64KB", "OAEPAndCBC", b) }
+func BenchmarkDecrypt1MBWithOAEPAndCBC(b *testing.B)  { benchDecrypt("1MB", "OAEPAndCBC", b) }
+func BenchmarkDecrypt64MBWithOAEPAndCBC(b *testing.B) { benchDecrypt("64MB", "OAEPAndCBC", b) }
+
+func BenchmarkDecrypt1BWithPKCSAndCBC(b *testing.B)   { benchDecrypt("1B", "PKCSAndCBC", b) }
+func BenchmarkDecrypt64BWithPKCSAndCBC(b *testing.B)  { benchDecrypt("64B", "PKCSAndCBC", b) }
+func BenchmarkDecrypt1KBWithPKCSAndCBC(b *testing.B)  { benchDecrypt("1KB", "PKCSAndCBC", b) }
+func BenchmarkDecrypt64KBWithPKCSAndCBC(b *testing.B) { benchDecrypt("64KB", "PKCSAndCBC", b) }
+func BenchmarkDecrypt1MBWithPKCSAndCBC(b *testing.B)  { benchDecrypt("1MB", "PKCSAndCBC", b) }
+func BenchmarkDecrypt64MBWithPKCSAndCBC(b *testing.B) { benchDecrypt("64MB", "PKCSAndCBC", b) }
+
+func BenchmarkDecrypt1BWithDirectGCM128(b *testing.B)   { benchDecrypt("1B", "DirectGCM128", b) }
+func BenchmarkDecrypt64BWithDirectGCM128(b *testing.B)  { benchDecrypt("64B", "DirectGCM128", b) }
+func BenchmarkDecrypt1KBWithDirectGCM128(b *testing.B)  { benchDecrypt("1KB", "DirectGCM128", b) }
+func BenchmarkDecrypt64KBWithDirectGCM128(b *testing.B) { benchDecrypt("64KB", "DirectGCM128", b) }
+func BenchmarkDecrypt1MBWithDirectGCM128(b *testing.B)  { benchDecrypt("1MB", "DirectGCM128", b) }
+func BenchmarkDecrypt64MBWithDirectGCM128(b *testing.B) { benchDecrypt("64MB", "DirectGCM128", b) }
+
+func BenchmarkDecrypt1BWithDirectCBC128(b *testing.B)   { benchDecrypt("1B", "DirectCBC128", b) }
+func BenchmarkDecrypt64BWithDirectCBC128(b *testing.B)  { benchDecrypt("64B", "DirectCBC128", b) }
+func BenchmarkDecrypt1KBWithDirectCBC128(b *testing.B)  { benchDecrypt("1KB", "DirectCBC128", b) }
+func BenchmarkDecrypt64KBWithDirectCBC128(b *testing.B) { benchDecrypt("64KB", "DirectCBC128", b) }
+func BenchmarkDecrypt1MBWithDirectCBC128(b *testing.B)  { benchDecrypt("1MB", "DirectCBC128", b) }
+func BenchmarkDecrypt64MBWithDirectCBC128(b *testing.B) { benchDecrypt("64MB", "DirectCBC128", b) }
+
+func BenchmarkDecrypt1BWithDirectGCM256(b *testing.B)   { benchDecrypt("1B", "DirectGCM256", b) }
+func BenchmarkDecrypt64BWithDirectGCM256(b *testing.B)  { benchDecrypt("64B", "DirectGCM256", b) }
+func BenchmarkDecrypt1KBWithDirectGCM256(b *testing.B)  { benchDecrypt("1KB", "DirectGCM256", b) }
+func BenchmarkDecrypt64KBWithDirectGCM256(b *testing.B) { benchDecrypt("64KB", "DirectGCM256", b) }
+func BenchmarkDecrypt1MBWithDirectGCM256(b *testing.B)  { benchDecrypt("1MB", "DirectGCM256", b) }
+func BenchmarkDecrypt64MBWithDirectGCM256(b *testing.B) { benchDecrypt("64MB", "DirectGCM256", b) }
+
+func BenchmarkDecrypt1BWithDirectCBC256(b *testing.B)   { benchDecrypt("1B", "DirectCBC256", b) }
+func BenchmarkDecrypt64BWithDirectCBC256(b *testing.B)  { benchDecrypt("64B", "DirectCBC256", b) }
+func BenchmarkDecrypt1KBWithDirectCBC256(b *testing.B)  { benchDecrypt("1KB", "DirectCBC256", b) }
+func BenchmarkDecrypt64KBWithDirectCBC256(b *testing.B) { benchDecrypt("64KB", "DirectCBC256", b) }
+func BenchmarkDecrypt1MBWithDirectCBC256(b *testing.B)  { benchDecrypt("1MB", "DirectCBC256", b) }
+func BenchmarkDecrypt64MBWithDirectCBC256(b *testing.B) { benchDecrypt("64MB", "DirectCBC256", b) }
+
+func BenchmarkDecrypt1BWithAESKWAndGCM128(b *testing.B)   { benchDecrypt("1B", "AESKWAndGCM128", b) }
+func BenchmarkDecrypt64BWithAESKWAndGCM128(b *testing.B)  { benchDecrypt("64B", "AESKWAndGCM128", b) }
+func BenchmarkDecrypt1KBWithAESKWAndGCM128(b *testing.B)  { benchDecrypt("1KB", "AESKWAndGCM128", b) }
+func BenchmarkDecrypt64KBWithAESKWAndGCM128(b *testing.B) { benchDecrypt("64KB", "AESKWAndGCM128", b) }
+func BenchmarkDecrypt1MBWithAESKWAndGCM128(b *testing.B)  { benchDecrypt("1MB", "AESKWAndGCM128", b) }
+func BenchmarkDecrypt64MBWithAESKWAndGCM128(b *testing.B) { benchDecrypt("64MB", "AESKWAndGCM128", b) }
+
+func BenchmarkDecrypt1BWithAESKWAndCBC256(b *testing.B)   { benchDecrypt("1B", "AESKWAndCBC256", b) }
+func BenchmarkDecrypt64BWithAESKWAndCBC256(b *testing.B)  { benchDecrypt("64B", "AESKWAndCBC256", b) }
+func BenchmarkDecrypt1KBWithAESKWAndCBC256(b *testing.B)  { benchDecrypt("1KB", "AESKWAndCBC256", b) }
+func BenchmarkDecrypt64KBWithAESKWAndCBC256(b *testing.B) { benchDecrypt("64KB", "AESKWAndCBC256", b) }
+func BenchmarkDecrypt1MBWithAESKWAndCBC256(b *testing.B)  { benchDecrypt("1MB", "AESKWAndCBC256", b) }
+func BenchmarkDecrypt64MBWithAESKWAndCBC256(b *testing.B) { benchDecrypt("64MB", "AESKWAndCBC256", b) }
+
+func BenchmarkDecrypt1BWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("1B", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkDecrypt64BWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("64B", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkDecrypt1KBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("1KB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkDecrypt64KBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("64KB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkDecrypt1MBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("1MB", "ECDHOnP256AndGCM128", b)
+}
+func BenchmarkDecrypt64MBWithECDHOnP256AndGCM128(b *testing.B) {
+	benchDecrypt("64MB", "ECDHOnP256AndGCM128", b)
+}
+
+func BenchmarkDecrypt1BWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("1B", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkDecrypt64BWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("64B", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkDecrypt1KBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("1KB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkDecrypt64KBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("64KB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkDecrypt1MBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("1MB", "ECDHOnP384AndGCM128", b)
+}
+func BenchmarkDecrypt64MBWithECDHOnP384AndGCM128(b *testing.B) {
+	benchDecrypt("64MB", "ECDHOnP384AndGCM128", b)
+}
+
+func BenchmarkDecrypt1BWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("1B", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkDecrypt64BWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("64B", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkDecrypt1KBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("1KB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkDecrypt64KBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("64KB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkDecrypt1MBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("1MB", "ECDHOnP521AndGCM128", b)
+}
+func BenchmarkDecrypt64MBWithECDHOnP521AndGCM128(b *testing.B) {
+	benchDecrypt("64MB", "ECDHOnP521AndGCM128", b)
+}
+
+func benchDecrypt(chunkKey, primKey string, b *testing.B) {
+	chunk, ok := chunks[chunkKey]
+	if !ok {
+		b.Fatalf("unknown chunk size %s", chunkKey)
+	}
+
+	enc, ok := encrypters[primKey]
+	if !ok {
+		b.Fatalf("unknown encrypter %s", primKey)
+	}
+
+	dec, ok := decryptionKeys[primKey]
+	if !ok {
+		b.Fatalf("unknown decryption key %s", primKey)
+	}
+
+	data, err := enc.Encrypt(chunk)
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.SetBytes(int64(len(chunk)))
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		data.Decrypt(dec)
+	}
+}
+
+func mustEncrypter(keyAlg KeyAlgorithm, encAlg ContentEncryption, encryptionKey interface{}) Encrypter {
+	enc, err := NewEncrypter(keyAlg, encAlg, encryptionKey)
+	if err != nil {
+		panic(err)
+	}
+	return enc
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/doc.go

@@ -0,0 +1,26 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+
+Package jose aims to provide an implementation of the Javascript Object Signing
+and Encryption set of standards. For the moment, it mainly focuses on
+encryption and signing based on the JSON Web Encryption and JSON Web Signature
+standards.  The library supports both the compact and full serialization
+formats, and has optional support for multiple recipients.
+
+*/
+package jose // import "gopkg.in/square/go-jose.v1"

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/doc_test.go

@@ -0,0 +1,226 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/rsa"
+	"fmt"
+)
+
+// Dummy encrypter for use in examples
+var encrypter, _ = NewEncrypter(DIRECT, A128GCM, []byte{})
+
+func Example_jWE() {
+	// Generate a public/private key pair to use for this example. The library
+	// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
+	// that can be used to load keys from PEM/DER-encoded data.
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		panic(err)
+	}
+
+	// Instantiate an encrypter using RSA-OAEP with AES128-GCM. An error would
+	// indicate that the selected algorithm(s) are not currently supported.
+	publicKey := &privateKey.PublicKey
+	encrypter, err := NewEncrypter(RSA_OAEP, A128GCM, publicKey)
+	if err != nil {
+		panic(err)
+	}
+
+	// Encrypt a sample plaintext. Calling the encrypter returns an encrypted
+	// JWE object, which can then be serialized for output afterwards. An error
+	// would indicate a problem in an underlying cryptographic primitive.
+	var plaintext = []byte("Lorem ipsum dolor sit amet")
+	object, err := encrypter.Encrypt(plaintext)
+	if err != nil {
+		panic(err)
+	}
+
+	// Serialize the encrypted object using the full serialization format.
+	// Alternatively you can also use the compact format here by calling
+	// object.CompactSerialize() instead.
+	serialized := object.FullSerialize()
+
+	// Parse the serialized, encrypted JWE object. An error would indicate that
+	// the given input did not represent a valid message.
+	object, err = ParseEncrypted(serialized)
+	if err != nil {
+		panic(err)
+	}
+
+	// Now we can decrypt and get back our original plaintext. An error here
+	// would indicate the the message failed to decrypt, e.g. because the auth
+	// tag was broken or the message was tampered with.
+	decrypted, err := object.Decrypt(privateKey)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf(string(decrypted))
+	// output: Lorem ipsum dolor sit amet
+}
+
+func Example_jWS() {
+	// Generate a public/private key pair to use for this example. The library
+	// also provides two utility functions (LoadPublicKey and LoadPrivateKey)
+	// that can be used to load keys from PEM/DER-encoded data.
+	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		panic(err)
+	}
+
+	// Instantiate a signer using RSASSA-PSS (SHA512) with the given private key.
+	signer, err := NewSigner(PS512, privateKey)
+	if err != nil {
+		panic(err)
+	}
+
+	// Sign a sample payload. Calling the signer returns a protected JWS object,
+	// which can then be serialized for output afterwards. An error would
+	// indicate a problem in an underlying cryptographic primitive.
+	var payload = []byte("Lorem ipsum dolor sit amet")
+	object, err := signer.Sign(payload)
+	if err != nil {
+		panic(err)
+	}
+
+	// Serialize the encrypted object using the full serialization format.
+	// Alternatively you can also use the compact format here by calling
+	// object.CompactSerialize() instead.
+	serialized := object.FullSerialize()
+
+	// Parse the serialized, protected JWS object. An error would indicate that
+	// the given input did not represent a valid message.
+	object, err = ParseSigned(serialized)
+	if err != nil {
+		panic(err)
+	}
+
+	// Now we can verify the signature on the payload. An error here would
+	// indicate the the message failed to verify, e.g. because the signature was
+	// broken or the message was tampered with.
+	output, err := object.Verify(&privateKey.PublicKey)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf(string(output))
+	// output: Lorem ipsum dolor sit amet
+}
+
+func ExampleNewEncrypter_publicKey() {
+	var publicKey *rsa.PublicKey
+
+	// Instantiate an encrypter using RSA-OAEP with AES128-GCM.
+	NewEncrypter(RSA_OAEP, A128GCM, publicKey)
+
+	// Instantiate an encrypter using RSA-PKCS1v1.5 with AES128-CBC+HMAC.
+	NewEncrypter(RSA1_5, A128CBC_HS256, publicKey)
+}
+
+func ExampleNewEncrypter_symmetric() {
+	var sharedKey []byte
+
+	// Instantiate an encrypter using AES128-GCM with AES-GCM key wrap.
+	NewEncrypter(A128GCMKW, A128GCM, sharedKey)
+
+	// Instantiate an encrypter using AES256-GCM directly, w/o key wrapping.
+	NewEncrypter(DIRECT, A256GCM, sharedKey)
+}
+
+func ExampleNewSigner_publicKey() {
+	var rsaPrivateKey *rsa.PrivateKey
+	var ecdsaPrivateKey *ecdsa.PrivateKey
+
+	// Instantiate a signer using RSA-PKCS#1v1.5 with SHA-256.
+	NewSigner(RS256, rsaPrivateKey)
+
+	// Instantiate a signer using ECDSA with SHA-384.
+	NewSigner(ES384, ecdsaPrivateKey)
+}
+
+func ExampleNewSigner_symmetric() {
+	var sharedKey []byte
+
+	// Instantiate an signer using HMAC-SHA256.
+	NewSigner(HS256, sharedKey)
+
+	// Instantiate an signer using HMAC-SHA512.
+	NewSigner(HS512, sharedKey)
+}
+
+func ExampleNewMultiEncrypter() {
+	var publicKey *rsa.PublicKey
+	var sharedKey []byte
+
+	// Instantiate an encrypter using AES-GCM.
+	encrypter, err := NewMultiEncrypter(A128GCM)
+	if err != nil {
+		panic(err)
+	}
+
+	// Add a recipient using a shared key with AES-GCM key wap
+	err = encrypter.AddRecipient(A128GCMKW, sharedKey)
+	if err != nil {
+		panic(err)
+	}
+
+	// Add a recipient using an RSA public key with RSA-OAEP
+	err = encrypter.AddRecipient(RSA_OAEP, publicKey)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func ExampleNewMultiSigner() {
+	var privateKey *rsa.PrivateKey
+	var sharedKey []byte
+
+	// Instantiate a signer for multiple recipients.
+	signer := NewMultiSigner()
+
+	// Add a recipient using a shared key with HMAC-SHA256
+	err := signer.AddRecipient(HS256, sharedKey)
+	if err != nil {
+		panic(err)
+	}
+
+	// Add a recipient using an RSA private key with RSASSA-PSS with SHA384
+	err = signer.AddRecipient(PS384, privateKey)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func ExampleEncrypter_encrypt() {
+	// Encrypt a plaintext in order to get an encrypted JWE object.
+	var plaintext = []byte("This is a secret message")
+
+	encrypter.Encrypt(plaintext)
+}
+
+func ExampleEncrypter_encryptWithAuthData() {
+	// Encrypt a plaintext in order to get an encrypted JWE object. Also attach
+	// some additional authenticated data (AAD) to the object. Note that objects
+	// with attached AAD can only be represented using full serialization.
+	var plaintext = []byte("This is a secret message")
+	var aad = []byte("This is authenticated, but public data")
+
+	encrypter.EncryptWithAuthData(plaintext, aad)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/encoding.go

@@ -0,0 +1,191 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"compress/flate"
+	"encoding/base64"
+	"encoding/binary"
+	"io"
+	"math/big"
+	"regexp"
+	"strings"
+)
+
+var stripWhitespaceRegex = regexp.MustCompile("\\s")
+
+// Url-safe base64 encode that strips padding
+func base64URLEncode(data []byte) string {
+	var result = base64.URLEncoding.EncodeToString(data)
+	return strings.TrimRight(result, "=")
+}
+
+// Url-safe base64 decoder that adds padding
+func base64URLDecode(data string) ([]byte, error) {
+	var missing = (4 - len(data)%4) % 4
+	data += strings.Repeat("=", missing)
+	return base64.URLEncoding.DecodeString(data)
+}
+
+// Helper function to serialize known-good objects.
+// Precondition: value is not a nil pointer.
+func mustSerializeJSON(value interface{}) []byte {
+	out, err := MarshalJSON(value)
+	if err != nil {
+		panic(err)
+	}
+	// We never want to serialize the top-level value "null," since it's not a
+	// valid JOSE message. But if a caller passes in a nil pointer to this method,
+	// MarshalJSON will happily serialize it as the top-level value "null". If
+	// that value is then embedded in another operation, for instance by being
+	// base64-encoded and fed as input to a signing algorithm
+	// (https://github.com/square/go-jose/issues/22), the result will be
+	// incorrect. Because this method is intended for known-good objects, and a nil
+	// pointer is not a known-good object, we are free to panic in this case.
+	// Note: It's not possible to directly check whether the data pointed at by an
+	// interface is a nil pointer, so we do this hacky workaround.
+	// https://groups.google.com/forum/#!topic/golang-nuts/wnH302gBa4I
+	if string(out) == "null" {
+		panic("Tried to serialize a nil pointer.")
+	}
+	return out
+}
+
+// Strip all newlines and whitespace
+func stripWhitespace(data string) string {
+	return stripWhitespaceRegex.ReplaceAllString(data, "")
+}
+
+// Perform compression based on algorithm
+func compress(algorithm CompressionAlgorithm, input []byte) ([]byte, error) {
+	switch algorithm {
+	case DEFLATE:
+		return deflate(input)
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+}
+
+// Perform decompression based on algorithm
+func decompress(algorithm CompressionAlgorithm, input []byte) ([]byte, error) {
+	switch algorithm {
+	case DEFLATE:
+		return inflate(input)
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+}
+
+// Compress with DEFLATE
+func deflate(input []byte) ([]byte, error) {
+	output := new(bytes.Buffer)
+
+	// Writing to byte buffer, err is always nil
+	writer, _ := flate.NewWriter(output, 1)
+	_, _ = io.Copy(writer, bytes.NewBuffer(input))
+
+	err := writer.Close()
+	return output.Bytes(), err
+}
+
+// Decompress with DEFLATE
+func inflate(input []byte) ([]byte, error) {
+	output := new(bytes.Buffer)
+	reader := flate.NewReader(bytes.NewBuffer(input))
+
+	_, err := io.Copy(output, reader)
+	if err != nil {
+		return nil, err
+	}
+
+	err = reader.Close()
+	return output.Bytes(), err
+}
+
+// byteBuffer represents a slice of bytes that can be serialized to url-safe base64.
+type byteBuffer struct {
+	data []byte
+}
+
+func newBuffer(data []byte) *byteBuffer {
+	if data == nil {
+		return nil
+	}
+	return &byteBuffer{
+		data: data,
+	}
+}
+
+func newFixedSizeBuffer(data []byte, length int) *byteBuffer {
+	if len(data) > length {
+		panic("square/go-jose: invalid call to newFixedSizeBuffer (len(data) > length)")
+	}
+	pad := make([]byte, length-len(data))
+	return newBuffer(append(pad, data...))
+}
+
+func newBufferFromInt(num uint64) *byteBuffer {
+	data := make([]byte, 8)
+	binary.BigEndian.PutUint64(data, num)
+	return newBuffer(bytes.TrimLeft(data, "\x00"))
+}
+
+func (b *byteBuffer) MarshalJSON() ([]byte, error) {
+	return MarshalJSON(b.base64())
+}
+
+func (b *byteBuffer) UnmarshalJSON(data []byte) error {
+	var encoded string
+	err := UnmarshalJSON(data, &encoded)
+	if err != nil {
+		return err
+	}
+
+	if encoded == "" {
+		return nil
+	}
+
+	decoded, err := base64URLDecode(encoded)
+	if err != nil {
+		return err
+	}
+
+	*b = *newBuffer(decoded)
+
+	return nil
+}
+
+func (b *byteBuffer) base64() string {
+	return base64URLEncode(b.data)
+}
+
+func (b *byteBuffer) bytes() []byte {
+	// Handling nil here allows us to transparently handle nil slices when serializing.
+	if b == nil {
+		return nil
+	}
+	return b.data
+}
+
+func (b byteBuffer) bigInt() *big.Int {
+	return new(big.Int).SetBytes(b.data)
+}
+
+func (b byteBuffer) toInt() int {
+	return int(b.bigInt().Int64())
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/encoding_test.go

@@ -0,0 +1,173 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestBase64URLEncode(t *testing.T) {
+	// Test arrays with various sizes
+	if base64URLEncode([]byte{}) != "" {
+		t.Error("failed to encode empty array")
+	}
+
+	if base64URLEncode([]byte{0}) != "AA" {
+		t.Error("failed to encode [0x00]")
+	}
+
+	if base64URLEncode([]byte{0, 1}) != "AAE" {
+		t.Error("failed to encode [0x00, 0x01]")
+	}
+
+	if base64URLEncode([]byte{0, 1, 2}) != "AAEC" {
+		t.Error("failed to encode [0x00, 0x01, 0x02]")
+	}
+
+	if base64URLEncode([]byte{0, 1, 2, 3}) != "AAECAw" {
+		t.Error("failed to encode [0x00, 0x01, 0x02, 0x03]")
+	}
+}
+
+func TestBase64URLDecode(t *testing.T) {
+	// Test arrays with various sizes
+	val, err := base64URLDecode("")
+	if err != nil || !bytes.Equal(val, []byte{}) {
+		t.Error("failed to decode empty array")
+	}
+
+	val, err = base64URLDecode("AA")
+	if err != nil || !bytes.Equal(val, []byte{0}) {
+		t.Error("failed to decode [0x00]")
+	}
+
+	val, err = base64URLDecode("AAE")
+	if err != nil || !bytes.Equal(val, []byte{0, 1}) {
+		t.Error("failed to decode [0x00, 0x01]")
+	}
+
+	val, err = base64URLDecode("AAEC")
+	if err != nil || !bytes.Equal(val, []byte{0, 1, 2}) {
+		t.Error("failed to decode [0x00, 0x01, 0x02]")
+	}
+
+	val, err = base64URLDecode("AAECAw")
+	if err != nil || !bytes.Equal(val, []byte{0, 1, 2, 3}) {
+		t.Error("failed to decode [0x00, 0x01, 0x02, 0x03]")
+	}
+}
+
+func TestDeflateRoundtrip(t *testing.T) {
+	original := []byte("Lorem ipsum dolor sit amet")
+
+	compressed, err := deflate(original)
+	if err != nil {
+		panic(err)
+	}
+
+	output, err := inflate(compressed)
+	if err != nil {
+		panic(err)
+	}
+
+	if bytes.Compare(output, original) != 0 {
+		t.Error("Input and output do not match")
+	}
+}
+
+func TestInvalidCompression(t *testing.T) {
+	_, err := compress("XYZ", []byte{})
+	if err == nil {
+		t.Error("should not accept invalid algorithm")
+	}
+
+	_, err = decompress("XYZ", []byte{})
+	if err == nil {
+		t.Error("should not accept invalid algorithm")
+	}
+
+	_, err = decompress(DEFLATE, []byte{1, 2, 3, 4})
+	if err == nil {
+		t.Error("should not accept invalid data")
+	}
+}
+
+func TestByteBufferTrim(t *testing.T) {
+	buf := newBufferFromInt(1)
+	if !bytes.Equal(buf.data, []byte{1}) {
+		t.Error("Byte buffer for integer '1' should contain [0x01]")
+	}
+
+	buf = newBufferFromInt(65537)
+	if !bytes.Equal(buf.data, []byte{1, 0, 1}) {
+		t.Error("Byte buffer for integer '65537' should contain [0x01, 0x00, 0x01]")
+	}
+}
+
+func TestFixedSizeBuffer(t *testing.T) {
+	data0 := []byte{}
+	data1 := []byte{1}
+	data2 := []byte{1, 2}
+	data3 := []byte{1, 2, 3}
+	data4 := []byte{1, 2, 3, 4}
+
+	buf0 := newFixedSizeBuffer(data0, 4)
+	buf1 := newFixedSizeBuffer(data1, 4)
+	buf2 := newFixedSizeBuffer(data2, 4)
+	buf3 := newFixedSizeBuffer(data3, 4)
+	buf4 := newFixedSizeBuffer(data4, 4)
+
+	if !bytes.Equal(buf0.data, []byte{0, 0, 0, 0}) {
+		t.Error("Invalid padded buffer for buf0")
+	}
+	if !bytes.Equal(buf1.data, []byte{0, 0, 0, 1}) {
+		t.Error("Invalid padded buffer for buf1")
+	}
+	if !bytes.Equal(buf2.data, []byte{0, 0, 1, 2}) {
+		t.Error("Invalid padded buffer for buf2")
+	}
+	if !bytes.Equal(buf3.data, []byte{0, 1, 2, 3}) {
+		t.Error("Invalid padded buffer for buf3")
+	}
+	if !bytes.Equal(buf4.data, []byte{1, 2, 3, 4}) {
+		t.Error("Invalid padded buffer for buf4")
+	}
+}
+
+func TestSerializeJSONRejectsNil(t *testing.T) {
+	defer func() {
+		r := recover()
+		if r == nil || !strings.Contains(r.(string), "nil pointer") {
+			t.Error("serialize function should not accept nil pointer")
+		}
+	}()
+
+	mustSerializeJSON(nil)
+}
+
+func TestFixedSizeBufferTooLarge(t *testing.T) {
+	defer func() {
+		r := recover()
+		if r == nil {
+			t.Error("should not be able to create fixed size buffer with oversized data")
+		}
+	}()
+
+	newFixedSizeBuffer(make([]byte, 2), 1)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/README.md

@@ -0,0 +1,13 @@
+# Safe JSON
+
+This repository contains a fork of the `encoding/json` package from Go 1.6.
+
+The following changes were made:
+
+* Object deserialization uses case-sensitive member name matching instead of
+  [case-insensitive matching](https://www.ietf.org/mail-archive/web/json/current/msg03763.html).
+  This is to avoid differences in the interpretation of JOSE messages between
+  go-jose and libraries written in other languages.
+* When deserializing a JSON object, we check for duplicate keys and reject the
+  input whenever we detect a duplicate. Rather than trying to work with malformed
+  data, we prefer to reject it right away.

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/bench_test.go

@@ -0,0 +1,223 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Large data benchmark.
+// The JSON data is a summary of agl's changes in the
+// go, webkit, and chromium open source projects.
+// We benchmark converting between the JSON form
+// and in-memory data structures.
+
+package json
+
+import (
+	"bytes"
+	"compress/gzip"
+	"io/ioutil"
+	"os"
+	"strings"
+	"testing"
+)
+
+type codeResponse struct {
+	Tree     *codeNode `json:"tree"`
+	Username string    `json:"username"`
+}
+
+type codeNode struct {
+	Name     string      `json:"name"`
+	Kids     []*codeNode `json:"kids"`
+	CLWeight float64     `json:"cl_weight"`
+	Touches  int         `json:"touches"`
+	MinT     int64       `json:"min_t"`
+	MaxT     int64       `json:"max_t"`
+	MeanT    int64       `json:"mean_t"`
+}
+
+var codeJSON []byte
+var codeStruct codeResponse
+
+func codeInit() {
+	f, err := os.Open("testdata/code.json.gz")
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+	gz, err := gzip.NewReader(f)
+	if err != nil {
+		panic(err)
+	}
+	data, err := ioutil.ReadAll(gz)
+	if err != nil {
+		panic(err)
+	}
+
+	codeJSON = data
+
+	if err := Unmarshal(codeJSON, &codeStruct); err != nil {
+		panic("unmarshal code.json: " + err.Error())
+	}
+
+	if data, err = Marshal(&codeStruct); err != nil {
+		panic("marshal code.json: " + err.Error())
+	}
+
+	if !bytes.Equal(data, codeJSON) {
+		println("different lengths", len(data), len(codeJSON))
+		for i := 0; i < len(data) && i < len(codeJSON); i++ {
+			if data[i] != codeJSON[i] {
+				println("re-marshal: changed at byte", i)
+				println("orig: ", string(codeJSON[i-10:i+10]))
+				println("new: ", string(data[i-10:i+10]))
+				break
+			}
+		}
+		panic("re-marshal code.json: different result")
+	}
+}
+
+func BenchmarkCodeEncoder(b *testing.B) {
+	if codeJSON == nil {
+		b.StopTimer()
+		codeInit()
+		b.StartTimer()
+	}
+	enc := NewEncoder(ioutil.Discard)
+	for i := 0; i < b.N; i++ {
+		if err := enc.Encode(&codeStruct); err != nil {
+			b.Fatal("Encode:", err)
+		}
+	}
+	b.SetBytes(int64(len(codeJSON)))
+}
+
+func BenchmarkCodeMarshal(b *testing.B) {
+	if codeJSON == nil {
+		b.StopTimer()
+		codeInit()
+		b.StartTimer()
+	}
+	for i := 0; i < b.N; i++ {
+		if _, err := Marshal(&codeStruct); err != nil {
+			b.Fatal("Marshal:", err)
+		}
+	}
+	b.SetBytes(int64(len(codeJSON)))
+}
+
+func BenchmarkCodeDecoder(b *testing.B) {
+	if codeJSON == nil {
+		b.StopTimer()
+		codeInit()
+		b.StartTimer()
+	}
+	var buf bytes.Buffer
+	dec := NewDecoder(&buf)
+	var r codeResponse
+	for i := 0; i < b.N; i++ {
+		buf.Write(codeJSON)
+		// hide EOF
+		buf.WriteByte('\n')
+		buf.WriteByte('\n')
+		buf.WriteByte('\n')
+		if err := dec.Decode(&r); err != nil {
+			b.Fatal("Decode:", err)
+		}
+	}
+	b.SetBytes(int64(len(codeJSON)))
+}
+
+func BenchmarkDecoderStream(b *testing.B) {
+	b.StopTimer()
+	var buf bytes.Buffer
+	dec := NewDecoder(&buf)
+	buf.WriteString(`"` + strings.Repeat("x", 1000000) + `"` + "\n\n\n")
+	var x interface{}
+	if err := dec.Decode(&x); err != nil {
+		b.Fatal("Decode:", err)
+	}
+	ones := strings.Repeat(" 1\n", 300000) + "\n\n\n"
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		if i%300000 == 0 {
+			buf.WriteString(ones)
+		}
+		x = nil
+		if err := dec.Decode(&x); err != nil || x != 1.0 {
+			b.Fatalf("Decode: %v after %d", err, i)
+		}
+	}
+}
+
+func BenchmarkCodeUnmarshal(b *testing.B) {
+	if codeJSON == nil {
+		b.StopTimer()
+		codeInit()
+		b.StartTimer()
+	}
+	for i := 0; i < b.N; i++ {
+		var r codeResponse
+		if err := Unmarshal(codeJSON, &r); err != nil {
+			b.Fatal("Unmmarshal:", err)
+		}
+	}
+	b.SetBytes(int64(len(codeJSON)))
+}
+
+func BenchmarkCodeUnmarshalReuse(b *testing.B) {
+	if codeJSON == nil {
+		b.StopTimer()
+		codeInit()
+		b.StartTimer()
+	}
+	var r codeResponse
+	for i := 0; i < b.N; i++ {
+		if err := Unmarshal(codeJSON, &r); err != nil {
+			b.Fatal("Unmmarshal:", err)
+		}
+	}
+}
+
+func BenchmarkUnmarshalString(b *testing.B) {
+	data := []byte(`"hello, world"`)
+	var s string
+
+	for i := 0; i < b.N; i++ {
+		if err := Unmarshal(data, &s); err != nil {
+			b.Fatal("Unmarshal:", err)
+		}
+	}
+}
+
+func BenchmarkUnmarshalFloat64(b *testing.B) {
+	var f float64
+	data := []byte(`3.14`)
+
+	for i := 0; i < b.N; i++ {
+		if err := Unmarshal(data, &f); err != nil {
+			b.Fatal("Unmarshal:", err)
+		}
+	}
+}
+
+func BenchmarkUnmarshalInt64(b *testing.B) {
+	var x int64
+	data := []byte(`3`)
+
+	for i := 0; i < b.N; i++ {
+		if err := Unmarshal(data, &x); err != nil {
+			b.Fatal("Unmarshal:", err)
+		}
+	}
+}
+
+func BenchmarkIssue10335(b *testing.B) {
+	b.ReportAllocs()
+	var s struct{}
+	j := []byte(`{"a":{ }}`)
+	for n := 0; n < b.N; n++ {
+		if err := Unmarshal(j, &s); err != nil {
+			b.Fatal(err)
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/encode_test.go

@@ -0,0 +1,538 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"math"
+	"reflect"
+	"testing"
+	"unicode"
+)
+
+type Optionals struct {
+	Sr string `json:"sr"`
+	So string `json:"so,omitempty"`
+	Sw string `json:"-"`
+
+	Ir int `json:"omitempty"` // actually named omitempty, not an option
+	Io int `json:"io,omitempty"`
+
+	Slr []string `json:"slr,random"`
+	Slo []string `json:"slo,omitempty"`
+
+	Mr map[string]interface{} `json:"mr"`
+	Mo map[string]interface{} `json:",omitempty"`
+
+	Fr float64 `json:"fr"`
+	Fo float64 `json:"fo,omitempty"`
+
+	Br bool `json:"br"`
+	Bo bool `json:"bo,omitempty"`
+
+	Ur uint `json:"ur"`
+	Uo uint `json:"uo,omitempty"`
+
+	Str struct{} `json:"str"`
+	Sto struct{} `json:"sto,omitempty"`
+}
+
+var optionalsExpected = `{
+ "sr": "",
+ "omitempty": 0,
+ "slr": null,
+ "mr": {},
+ "fr": 0,
+ "br": false,
+ "ur": 0,
+ "str": {},
+ "sto": {}
+}`
+
+func TestOmitEmpty(t *testing.T) {
+	var o Optionals
+	o.Sw = "something"
+	o.Mr = map[string]interface{}{}
+	o.Mo = map[string]interface{}{}
+
+	got, err := MarshalIndent(&o, "", " ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := string(got); got != optionalsExpected {
+		t.Errorf(" got: %s\nwant: %s\n", got, optionalsExpected)
+	}
+}
+
+type StringTag struct {
+	BoolStr bool   `json:",string"`
+	IntStr  int64  `json:",string"`
+	StrStr  string `json:",string"`
+}
+
+var stringTagExpected = `{
+ "BoolStr": "true",
+ "IntStr": "42",
+ "StrStr": "\"xzbit\""
+}`
+
+func TestStringTag(t *testing.T) {
+	var s StringTag
+	s.BoolStr = true
+	s.IntStr = 42
+	s.StrStr = "xzbit"
+	got, err := MarshalIndent(&s, "", " ")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := string(got); got != stringTagExpected {
+		t.Fatalf(" got: %s\nwant: %s\n", got, stringTagExpected)
+	}
+
+	// Verify that it round-trips.
+	var s2 StringTag
+	err = NewDecoder(bytes.NewReader(got)).Decode(&s2)
+	if err != nil {
+		t.Fatalf("Decode: %v", err)
+	}
+	if !reflect.DeepEqual(s, s2) {
+		t.Fatalf("decode didn't match.\nsource: %#v\nEncoded as:\n%s\ndecode: %#v", s, string(got), s2)
+	}
+}
+
+// byte slices are special even if they're renamed types.
+type renamedByte byte
+type renamedByteSlice []byte
+type renamedRenamedByteSlice []renamedByte
+
+func TestEncodeRenamedByteSlice(t *testing.T) {
+	s := renamedByteSlice("abc")
+	result, err := Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	expect := `"YWJj"`
+	if string(result) != expect {
+		t.Errorf(" got %s want %s", result, expect)
+	}
+	r := renamedRenamedByteSlice("abc")
+	result, err = Marshal(r)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(result) != expect {
+		t.Errorf(" got %s want %s", result, expect)
+	}
+}
+
+var unsupportedValues = []interface{}{
+	math.NaN(),
+	math.Inf(-1),
+	math.Inf(1),
+}
+
+func TestUnsupportedValues(t *testing.T) {
+	for _, v := range unsupportedValues {
+		if _, err := Marshal(v); err != nil {
+			if _, ok := err.(*UnsupportedValueError); !ok {
+				t.Errorf("for %v, got %T want UnsupportedValueError", v, err)
+			}
+		} else {
+			t.Errorf("for %v, expected error", v)
+		}
+	}
+}
+
+// Ref has Marshaler and Unmarshaler methods with pointer receiver.
+type Ref int
+
+func (*Ref) MarshalJSON() ([]byte, error) {
+	return []byte(`"ref"`), nil
+}
+
+func (r *Ref) UnmarshalJSON([]byte) error {
+	*r = 12
+	return nil
+}
+
+// Val has Marshaler methods with value receiver.
+type Val int
+
+func (Val) MarshalJSON() ([]byte, error) {
+	return []byte(`"val"`), nil
+}
+
+// RefText has Marshaler and Unmarshaler methods with pointer receiver.
+type RefText int
+
+func (*RefText) MarshalText() ([]byte, error) {
+	return []byte(`"ref"`), nil
+}
+
+func (r *RefText) UnmarshalText([]byte) error {
+	*r = 13
+	return nil
+}
+
+// ValText has Marshaler methods with value receiver.
+type ValText int
+
+func (ValText) MarshalText() ([]byte, error) {
+	return []byte(`"val"`), nil
+}
+
+func TestRefValMarshal(t *testing.T) {
+	var s = struct {
+		R0 Ref
+		R1 *Ref
+		R2 RefText
+		R3 *RefText
+		V0 Val
+		V1 *Val
+		V2 ValText
+		V3 *ValText
+	}{
+		R0: 12,
+		R1: new(Ref),
+		R2: 14,
+		R3: new(RefText),
+		V0: 13,
+		V1: new(Val),
+		V2: 15,
+		V3: new(ValText),
+	}
+	const want = `{"R0":"ref","R1":"ref","R2":"\"ref\"","R3":"\"ref\"","V0":"val","V1":"val","V2":"\"val\"","V3":"\"val\""}`
+	b, err := Marshal(&s)
+	if err != nil {
+		t.Fatalf("Marshal: %v", err)
+	}
+	if got := string(b); got != want {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}
+
+// C implements Marshaler and returns unescaped JSON.
+type C int
+
+func (C) MarshalJSON() ([]byte, error) {
+	return []byte(`"<&>"`), nil
+}
+
+// CText implements Marshaler and returns unescaped text.
+type CText int
+
+func (CText) MarshalText() ([]byte, error) {
+	return []byte(`"<&>"`), nil
+}
+
+func TestMarshalerEscaping(t *testing.T) {
+	var c C
+	want := `"\u003c\u0026\u003e"`
+	b, err := Marshal(c)
+	if err != nil {
+		t.Fatalf("Marshal(c): %v", err)
+	}
+	if got := string(b); got != want {
+		t.Errorf("Marshal(c) = %#q, want %#q", got, want)
+	}
+
+	var ct CText
+	want = `"\"\u003c\u0026\u003e\""`
+	b, err = Marshal(ct)
+	if err != nil {
+		t.Fatalf("Marshal(ct): %v", err)
+	}
+	if got := string(b); got != want {
+		t.Errorf("Marshal(ct) = %#q, want %#q", got, want)
+	}
+}
+
+type IntType int
+
+type MyStruct struct {
+	IntType
+}
+
+func TestAnonymousNonstruct(t *testing.T) {
+	var i IntType = 11
+	a := MyStruct{i}
+	const want = `{"IntType":11}`
+
+	b, err := Marshal(a)
+	if err != nil {
+		t.Fatalf("Marshal: %v", err)
+	}
+	if got := string(b); got != want {
+		t.Errorf("got %q, want %q", got, want)
+	}
+}
+
+type BugA struct {
+	S string
+}
+
+type BugB struct {
+	BugA
+	S string
+}
+
+type BugC struct {
+	S string
+}
+
+// Legal Go: We never use the repeated embedded field (S).
+type BugX struct {
+	A int
+	BugA
+	BugB
+}
+
+// Issue 5245.
+func TestEmbeddedBug(t *testing.T) {
+	v := BugB{
+		BugA{"A"},
+		"B",
+	}
+	b, err := Marshal(v)
+	if err != nil {
+		t.Fatal("Marshal:", err)
+	}
+	want := `{"S":"B"}`
+	got := string(b)
+	if got != want {
+		t.Fatalf("Marshal: got %s want %s", got, want)
+	}
+	// Now check that the duplicate field, S, does not appear.
+	x := BugX{
+		A: 23,
+	}
+	b, err = Marshal(x)
+	if err != nil {
+		t.Fatal("Marshal:", err)
+	}
+	want = `{"A":23}`
+	got = string(b)
+	if got != want {
+		t.Fatalf("Marshal: got %s want %s", got, want)
+	}
+}
+
+type BugD struct { // Same as BugA after tagging.
+	XXX string `json:"S"`
+}
+
+// BugD's tagged S field should dominate BugA's.
+type BugY struct {
+	BugA
+	BugD
+}
+
+// Test that a field with a tag dominates untagged fields.
+func TestTaggedFieldDominates(t *testing.T) {
+	v := BugY{
+		BugA{"BugA"},
+		BugD{"BugD"},
+	}
+	b, err := Marshal(v)
+	if err != nil {
+		t.Fatal("Marshal:", err)
+	}
+	want := `{"S":"BugD"}`
+	got := string(b)
+	if got != want {
+		t.Fatalf("Marshal: got %s want %s", got, want)
+	}
+}
+
+// There are no tags here, so S should not appear.
+type BugZ struct {
+	BugA
+	BugC
+	BugY // Contains a tagged S field through BugD; should not dominate.
+}
+
+func TestDuplicatedFieldDisappears(t *testing.T) {
+	v := BugZ{
+		BugA{"BugA"},
+		BugC{"BugC"},
+		BugY{
+			BugA{"nested BugA"},
+			BugD{"nested BugD"},
+		},
+	}
+	b, err := Marshal(v)
+	if err != nil {
+		t.Fatal("Marshal:", err)
+	}
+	want := `{}`
+	got := string(b)
+	if got != want {
+		t.Fatalf("Marshal: got %s want %s", got, want)
+	}
+}
+
+func TestStringBytes(t *testing.T) {
+	// Test that encodeState.stringBytes and encodeState.string use the same encoding.
+	es := &encodeState{}
+	var r []rune
+	for i := '\u0000'; i <= unicode.MaxRune; i++ {
+		r = append(r, i)
+	}
+	s := string(r) + "\xff\xff\xffhello" // some invalid UTF-8 too
+	es.string(s)
+
+	esBytes := &encodeState{}
+	esBytes.stringBytes([]byte(s))
+
+	enc := es.Buffer.String()
+	encBytes := esBytes.Buffer.String()
+	if enc != encBytes {
+		i := 0
+		for i < len(enc) && i < len(encBytes) && enc[i] == encBytes[i] {
+			i++
+		}
+		enc = enc[i:]
+		encBytes = encBytes[i:]
+		i = 0
+		for i < len(enc) && i < len(encBytes) && enc[len(enc)-i-1] == encBytes[len(encBytes)-i-1] {
+			i++
+		}
+		enc = enc[:len(enc)-i]
+		encBytes = encBytes[:len(encBytes)-i]
+
+		if len(enc) > 20 {
+			enc = enc[:20] + "..."
+		}
+		if len(encBytes) > 20 {
+			encBytes = encBytes[:20] + "..."
+		}
+
+		t.Errorf("encodings differ at %#q vs %#q", enc, encBytes)
+	}
+}
+
+func TestIssue6458(t *testing.T) {
+	type Foo struct {
+		M RawMessage
+	}
+	x := Foo{RawMessage(`"foo"`)}
+
+	b, err := Marshal(&x)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if want := `{"M":"foo"}`; string(b) != want {
+		t.Errorf("Marshal(&x) = %#q; want %#q", b, want)
+	}
+
+	b, err = Marshal(x)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if want := `{"M":"ImZvbyI="}`; string(b) != want {
+		t.Errorf("Marshal(x) = %#q; want %#q", b, want)
+	}
+}
+
+func TestIssue10281(t *testing.T) {
+	type Foo struct {
+		N Number
+	}
+	x := Foo{Number(`invalid`)}
+
+	b, err := Marshal(&x)
+	if err == nil {
+		t.Errorf("Marshal(&x) = %#q; want error", b)
+	}
+}
+
+func TestHTMLEscape(t *testing.T) {
+	var b, want bytes.Buffer
+	m := `{"M":"<html>foo &` + "\xe2\x80\xa8 \xe2\x80\xa9" + `</html>"}`
+	want.Write([]byte(`{"M":"\u003chtml\u003efoo \u0026\u2028 \u2029\u003c/html\u003e"}`))
+	HTMLEscape(&b, []byte(m))
+	if !bytes.Equal(b.Bytes(), want.Bytes()) {
+		t.Errorf("HTMLEscape(&b, []byte(m)) = %s; want %s", b.Bytes(), want.Bytes())
+	}
+}
+
+// golang.org/issue/8582
+func TestEncodePointerString(t *testing.T) {
+	type stringPointer struct {
+		N *int64 `json:"n,string"`
+	}
+	var n int64 = 42
+	b, err := Marshal(stringPointer{N: &n})
+	if err != nil {
+		t.Fatalf("Marshal: %v", err)
+	}
+	if got, want := string(b), `{"n":"42"}`; got != want {
+		t.Errorf("Marshal = %s, want %s", got, want)
+	}
+	var back stringPointer
+	err = Unmarshal(b, &back)
+	if err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	if back.N == nil {
+		t.Fatalf("Unmarshalled nil N field")
+	}
+	if *back.N != 42 {
+		t.Fatalf("*N = %d; want 42", *back.N)
+	}
+}
+
+var encodeStringTests = []struct {
+	in  string
+	out string
+}{
+	{"\x00", `"\u0000"`},
+	{"\x01", `"\u0001"`},
+	{"\x02", `"\u0002"`},
+	{"\x03", `"\u0003"`},
+	{"\x04", `"\u0004"`},
+	{"\x05", `"\u0005"`},
+	{"\x06", `"\u0006"`},
+	{"\x07", `"\u0007"`},
+	{"\x08", `"\u0008"`},
+	{"\x09", `"\t"`},
+	{"\x0a", `"\n"`},
+	{"\x0b", `"\u000b"`},
+	{"\x0c", `"\u000c"`},
+	{"\x0d", `"\r"`},
+	{"\x0e", `"\u000e"`},
+	{"\x0f", `"\u000f"`},
+	{"\x10", `"\u0010"`},
+	{"\x11", `"\u0011"`},
+	{"\x12", `"\u0012"`},
+	{"\x13", `"\u0013"`},
+	{"\x14", `"\u0014"`},
+	{"\x15", `"\u0015"`},
+	{"\x16", `"\u0016"`},
+	{"\x17", `"\u0017"`},
+	{"\x18", `"\u0018"`},
+	{"\x19", `"\u0019"`},
+	{"\x1a", `"\u001a"`},
+	{"\x1b", `"\u001b"`},
+	{"\x1c", `"\u001c"`},
+	{"\x1d", `"\u001d"`},
+	{"\x1e", `"\u001e"`},
+	{"\x1f", `"\u001f"`},
+}
+
+func TestEncodeString(t *testing.T) {
+	for _, tt := range encodeStringTests {
+		b, err := Marshal(tt.in)
+		if err != nil {
+			t.Errorf("Marshal(%q): %v", tt.in, err)
+			continue
+		}
+		out := string(b)
+		if out != tt.out {
+			t.Errorf("Marshal(%q) = %#q, want %#q", tt.in, out, tt.out)
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/indent.go

@@ -0,0 +1,141 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import "bytes"
+
+// Compact appends to dst the JSON-encoded src with
+// insignificant space characters elided.
+func Compact(dst *bytes.Buffer, src []byte) error {
+	return compact(dst, src, false)
+}
+
+func compact(dst *bytes.Buffer, src []byte, escape bool) error {
+	origLen := dst.Len()
+	var scan scanner
+	scan.reset()
+	start := 0
+	for i, c := range src {
+		if escape && (c == '<' || c == '>' || c == '&') {
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			dst.WriteString(`\u00`)
+			dst.WriteByte(hex[c>>4])
+			dst.WriteByte(hex[c&0xF])
+			start = i + 1
+		}
+		// Convert U+2028 and U+2029 (E2 80 A8 and E2 80 A9).
+		if c == 0xE2 && i+2 < len(src) && src[i+1] == 0x80 && src[i+2]&^1 == 0xA8 {
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			dst.WriteString(`\u202`)
+			dst.WriteByte(hex[src[i+2]&0xF])
+			start = i + 3
+		}
+		v := scan.step(&scan, c)
+		if v >= scanSkipSpace {
+			if v == scanError {
+				break
+			}
+			if start < i {
+				dst.Write(src[start:i])
+			}
+			start = i + 1
+		}
+	}
+	if scan.eof() == scanError {
+		dst.Truncate(origLen)
+		return scan.err
+	}
+	if start < len(src) {
+		dst.Write(src[start:])
+	}
+	return nil
+}
+
+func newline(dst *bytes.Buffer, prefix, indent string, depth int) {
+	dst.WriteByte('\n')
+	dst.WriteString(prefix)
+	for i := 0; i < depth; i++ {
+		dst.WriteString(indent)
+	}
+}
+
+// Indent appends to dst an indented form of the JSON-encoded src.
+// Each element in a JSON object or array begins on a new,
+// indented line beginning with prefix followed by one or more
+// copies of indent according to the indentation nesting.
+// The data appended to dst does not begin with the prefix nor
+// any indentation, to make it easier to embed inside other formatted JSON data.
+// Although leading space characters (space, tab, carriage return, newline)
+// at the beginning of src are dropped, trailing space characters
+// at the end of src are preserved and copied to dst.
+// For example, if src has no trailing spaces, neither will dst;
+// if src ends in a trailing newline, so will dst.
+func Indent(dst *bytes.Buffer, src []byte, prefix, indent string) error {
+	origLen := dst.Len()
+	var scan scanner
+	scan.reset()
+	needIndent := false
+	depth := 0
+	for _, c := range src {
+		scan.bytes++
+		v := scan.step(&scan, c)
+		if v == scanSkipSpace {
+			continue
+		}
+		if v == scanError {
+			break
+		}
+		if needIndent && v != scanEndObject && v != scanEndArray {
+			needIndent = false
+			depth++
+			newline(dst, prefix, indent, depth)
+		}
+
+		// Emit semantically uninteresting bytes
+		// (in particular, punctuation in strings) unmodified.
+		if v == scanContinue {
+			dst.WriteByte(c)
+			continue
+		}
+
+		// Add spacing around real punctuation.
+		switch c {
+		case '{', '[':
+			// delay indent so that empty object and array are formatted as {} and [].
+			needIndent = true
+			dst.WriteByte(c)
+
+		case ',':
+			dst.WriteByte(c)
+			newline(dst, prefix, indent, depth)
+
+		case ':':
+			dst.WriteByte(c)
+			dst.WriteByte(' ')
+
+		case '}', ']':
+			if needIndent {
+				// suppress indent in empty object/array
+				needIndent = false
+			} else {
+				depth--
+				newline(dst, prefix, indent, depth)
+			}
+			dst.WriteByte(c)
+
+		default:
+			dst.WriteByte(c)
+		}
+	}
+	if scan.eof() == scanError {
+		dst.Truncate(origLen)
+		return scan.err
+	}
+	return nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/number_test.go

@@ -0,0 +1,133 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"regexp"
+	"testing"
+)
+
+func TestNumberIsValid(t *testing.T) {
+	// From: http://stackoverflow.com/a/13340826
+	var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
+
+	validTests := []string{
+		"0",
+		"-0",
+		"1",
+		"-1",
+		"0.1",
+		"-0.1",
+		"1234",
+		"-1234",
+		"12.34",
+		"-12.34",
+		"12E0",
+		"12E1",
+		"12e34",
+		"12E-0",
+		"12e+1",
+		"12e-34",
+		"-12E0",
+		"-12E1",
+		"-12e34",
+		"-12E-0",
+		"-12e+1",
+		"-12e-34",
+		"1.2E0",
+		"1.2E1",
+		"1.2e34",
+		"1.2E-0",
+		"1.2e+1",
+		"1.2e-34",
+		"-1.2E0",
+		"-1.2E1",
+		"-1.2e34",
+		"-1.2E-0",
+		"-1.2e+1",
+		"-1.2e-34",
+		"0E0",
+		"0E1",
+		"0e34",
+		"0E-0",
+		"0e+1",
+		"0e-34",
+		"-0E0",
+		"-0E1",
+		"-0e34",
+		"-0E-0",
+		"-0e+1",
+		"-0e-34",
+	}
+
+	for _, test := range validTests {
+		if !isValidNumber(test) {
+			t.Errorf("%s should be valid", test)
+		}
+
+		var f float64
+		if err := Unmarshal([]byte(test), &f); err != nil {
+			t.Errorf("%s should be valid but Unmarshal failed: %v", test, err)
+		}
+
+		if !jsonNumberRegexp.MatchString(test) {
+			t.Errorf("%s should be valid but regexp does not match", test)
+		}
+	}
+
+	invalidTests := []string{
+		"",
+		"invalid",
+		"1.0.1",
+		"1..1",
+		"-1-2",
+		"012a42",
+		"01.2",
+		"012",
+		"12E12.12",
+		"1e2e3",
+		"1e+-2",
+		"1e--23",
+		"1e",
+		"e1",
+		"1e+",
+		"1ea",
+		"1a",
+		"1.a",
+		"1.",
+		"01",
+		"1.e1",
+	}
+
+	for _, test := range invalidTests {
+		if isValidNumber(test) {
+			t.Errorf("%s should be invalid", test)
+		}
+
+		var f float64
+		if err := Unmarshal([]byte(test), &f); err == nil {
+			t.Errorf("%s should be invalid but unmarshal wrote %v", test, f)
+		}
+
+		if jsonNumberRegexp.MatchString(test) {
+			t.Errorf("%s should be invalid but matches regexp", test)
+		}
+	}
+}
+
+func BenchmarkNumberIsValid(b *testing.B) {
+	s := "-61657.61667E+61673"
+	for i := 0; i < b.N; i++ {
+		isValidNumber(s)
+	}
+}
+
+func BenchmarkNumberIsValidRegexp(b *testing.B) {
+	var jsonNumberRegexp = regexp.MustCompile(`^-?(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?$`)
+	s := "-61657.61667E+61673"
+	for i := 0; i < b.N; i++ {
+		jsonNumberRegexp.MatchString(s)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/scanner.go

@@ -0,0 +1,623 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+// JSON value parser state machine.
+// Just about at the limit of what is reasonable to write by hand.
+// Some parts are a bit tedious, but overall it nicely factors out the
+// otherwise common code from the multiple scanning functions
+// in this package (Compact, Indent, checkValid, nextValue, etc).
+//
+// This file starts with two simple examples using the scanner
+// before diving into the scanner itself.
+
+import "strconv"
+
+// checkValid verifies that data is valid JSON-encoded data.
+// scan is passed in for use by checkValid to avoid an allocation.
+func checkValid(data []byte, scan *scanner) error {
+	scan.reset()
+	for _, c := range data {
+		scan.bytes++
+		if scan.step(scan, c) == scanError {
+			return scan.err
+		}
+	}
+	if scan.eof() == scanError {
+		return scan.err
+	}
+	return nil
+}
+
+// nextValue splits data after the next whole JSON value,
+// returning that value and the bytes that follow it as separate slices.
+// scan is passed in for use by nextValue to avoid an allocation.
+func nextValue(data []byte, scan *scanner) (value, rest []byte, err error) {
+	scan.reset()
+	for i, c := range data {
+		v := scan.step(scan, c)
+		if v >= scanEndObject {
+			switch v {
+			// probe the scanner with a space to determine whether we will
+			// get scanEnd on the next character. Otherwise, if the next character
+			// is not a space, scanEndTop allocates a needless error.
+			case scanEndObject, scanEndArray:
+				if scan.step(scan, ' ') == scanEnd {
+					return data[:i+1], data[i+1:], nil
+				}
+			case scanError:
+				return nil, nil, scan.err
+			case scanEnd:
+				return data[:i], data[i:], nil
+			}
+		}
+	}
+	if scan.eof() == scanError {
+		return nil, nil, scan.err
+	}
+	return data, nil, nil
+}
+
+// A SyntaxError is a description of a JSON syntax error.
+type SyntaxError struct {
+	msg    string // description of error
+	Offset int64  // error occurred after reading Offset bytes
+}
+
+func (e *SyntaxError) Error() string { return e.msg }
+
+// A scanner is a JSON scanning state machine.
+// Callers call scan.reset() and then pass bytes in one at a time
+// by calling scan.step(&scan, c) for each byte.
+// The return value, referred to as an opcode, tells the
+// caller about significant parsing events like beginning
+// and ending literals, objects, and arrays, so that the
+// caller can follow along if it wishes.
+// The return value scanEnd indicates that a single top-level
+// JSON value has been completed, *before* the byte that
+// just got passed in.  (The indication must be delayed in order
+// to recognize the end of numbers: is 123 a whole value or
+// the beginning of 12345e+6?).
+type scanner struct {
+	// The step is a func to be called to execute the next transition.
+	// Also tried using an integer constant and a single func
+	// with a switch, but using the func directly was 10% faster
+	// on a 64-bit Mac Mini, and it's nicer to read.
+	step func(*scanner, byte) int
+
+	// Reached end of top-level value.
+	endTop bool
+
+	// Stack of what we're in the middle of - array values, object keys, object values.
+	parseState []int
+
+	// Error that happened, if any.
+	err error
+
+	// 1-byte redo (see undo method)
+	redo      bool
+	redoCode  int
+	redoState func(*scanner, byte) int
+
+	// total bytes consumed, updated by decoder.Decode
+	bytes int64
+}
+
+// These values are returned by the state transition functions
+// assigned to scanner.state and the method scanner.eof.
+// They give details about the current state of the scan that
+// callers might be interested to know about.
+// It is okay to ignore the return value of any particular
+// call to scanner.state: if one call returns scanError,
+// every subsequent call will return scanError too.
+const (
+	// Continue.
+	scanContinue     = iota // uninteresting byte
+	scanBeginLiteral        // end implied by next result != scanContinue
+	scanBeginObject         // begin object
+	scanObjectKey           // just finished object key (string)
+	scanObjectValue         // just finished non-last object value
+	scanEndObject           // end object (implies scanObjectValue if possible)
+	scanBeginArray          // begin array
+	scanArrayValue          // just finished array value
+	scanEndArray            // end array (implies scanArrayValue if possible)
+	scanSkipSpace           // space byte; can skip; known to be last "continue" result
+
+	// Stop.
+	scanEnd   // top-level value ended *before* this byte; known to be first "stop" result
+	scanError // hit an error, scanner.err.
+)
+
+// These values are stored in the parseState stack.
+// They give the current state of a composite value
+// being scanned.  If the parser is inside a nested value
+// the parseState describes the nested state, outermost at entry 0.
+const (
+	parseObjectKey   = iota // parsing object key (before colon)
+	parseObjectValue        // parsing object value (after colon)
+	parseArrayValue         // parsing array value
+)
+
+// reset prepares the scanner for use.
+// It must be called before calling s.step.
+func (s *scanner) reset() {
+	s.step = stateBeginValue
+	s.parseState = s.parseState[0:0]
+	s.err = nil
+	s.redo = false
+	s.endTop = false
+}
+
+// eof tells the scanner that the end of input has been reached.
+// It returns a scan status just as s.step does.
+func (s *scanner) eof() int {
+	if s.err != nil {
+		return scanError
+	}
+	if s.endTop {
+		return scanEnd
+	}
+	s.step(s, ' ')
+	if s.endTop {
+		return scanEnd
+	}
+	if s.err == nil {
+		s.err = &SyntaxError{"unexpected end of JSON input", s.bytes}
+	}
+	return scanError
+}
+
+// pushParseState pushes a new parse state p onto the parse stack.
+func (s *scanner) pushParseState(p int) {
+	s.parseState = append(s.parseState, p)
+}
+
+// popParseState pops a parse state (already obtained) off the stack
+// and updates s.step accordingly.
+func (s *scanner) popParseState() {
+	n := len(s.parseState) - 1
+	s.parseState = s.parseState[0:n]
+	s.redo = false
+	if n == 0 {
+		s.step = stateEndTop
+		s.endTop = true
+	} else {
+		s.step = stateEndValue
+	}
+}
+
+func isSpace(c byte) bool {
+	return c == ' ' || c == '\t' || c == '\r' || c == '\n'
+}
+
+// stateBeginValueOrEmpty is the state after reading `[`.
+func stateBeginValueOrEmpty(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == ']' {
+		return stateEndValue(s, c)
+	}
+	return stateBeginValue(s, c)
+}
+
+// stateBeginValue is the state at the beginning of the input.
+func stateBeginValue(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	switch c {
+	case '{':
+		s.step = stateBeginStringOrEmpty
+		s.pushParseState(parseObjectKey)
+		return scanBeginObject
+	case '[':
+		s.step = stateBeginValueOrEmpty
+		s.pushParseState(parseArrayValue)
+		return scanBeginArray
+	case '"':
+		s.step = stateInString
+		return scanBeginLiteral
+	case '-':
+		s.step = stateNeg
+		return scanBeginLiteral
+	case '0': // beginning of 0.123
+		s.step = state0
+		return scanBeginLiteral
+	case 't': // beginning of true
+		s.step = stateT
+		return scanBeginLiteral
+	case 'f': // beginning of false
+		s.step = stateF
+		return scanBeginLiteral
+	case 'n': // beginning of null
+		s.step = stateN
+		return scanBeginLiteral
+	}
+	if '1' <= c && c <= '9' { // beginning of 1234.5
+		s.step = state1
+		return scanBeginLiteral
+	}
+	return s.error(c, "looking for beginning of value")
+}
+
+// stateBeginStringOrEmpty is the state after reading `{`.
+func stateBeginStringOrEmpty(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == '}' {
+		n := len(s.parseState)
+		s.parseState[n-1] = parseObjectValue
+		return stateEndValue(s, c)
+	}
+	return stateBeginString(s, c)
+}
+
+// stateBeginString is the state after reading `{"key": value,`.
+func stateBeginString(s *scanner, c byte) int {
+	if c <= ' ' && isSpace(c) {
+		return scanSkipSpace
+	}
+	if c == '"' {
+		s.step = stateInString
+		return scanBeginLiteral
+	}
+	return s.error(c, "looking for beginning of object key string")
+}
+
+// stateEndValue is the state after completing a value,
+// such as after reading `{}` or `true` or `["x"`.
+func stateEndValue(s *scanner, c byte) int {
+	n := len(s.parseState)
+	if n == 0 {
+		// Completed top-level before the current byte.
+		s.step = stateEndTop
+		s.endTop = true
+		return stateEndTop(s, c)
+	}
+	if c <= ' ' && isSpace(c) {
+		s.step = stateEndValue
+		return scanSkipSpace
+	}
+	ps := s.parseState[n-1]
+	switch ps {
+	case parseObjectKey:
+		if c == ':' {
+			s.parseState[n-1] = parseObjectValue
+			s.step = stateBeginValue
+			return scanObjectKey
+		}
+		return s.error(c, "after object key")
+	case parseObjectValue:
+		if c == ',' {
+			s.parseState[n-1] = parseObjectKey
+			s.step = stateBeginString
+			return scanObjectValue
+		}
+		if c == '}' {
+			s.popParseState()
+			return scanEndObject
+		}
+		return s.error(c, "after object key:value pair")
+	case parseArrayValue:
+		if c == ',' {
+			s.step = stateBeginValue
+			return scanArrayValue
+		}
+		if c == ']' {
+			s.popParseState()
+			return scanEndArray
+		}
+		return s.error(c, "after array element")
+	}
+	return s.error(c, "")
+}
+
+// stateEndTop is the state after finishing the top-level value,
+// such as after reading `{}` or `[1,2,3]`.
+// Only space characters should be seen now.
+func stateEndTop(s *scanner, c byte) int {
+	if c != ' ' && c != '\t' && c != '\r' && c != '\n' {
+		// Complain about non-space byte on next call.
+		s.error(c, "after top-level value")
+	}
+	return scanEnd
+}
+
+// stateInString is the state after reading `"`.
+func stateInString(s *scanner, c byte) int {
+	if c == '"' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	if c == '\\' {
+		s.step = stateInStringEsc
+		return scanContinue
+	}
+	if c < 0x20 {
+		return s.error(c, "in string literal")
+	}
+	return scanContinue
+}
+
+// stateInStringEsc is the state after reading `"\` during a quoted string.
+func stateInStringEsc(s *scanner, c byte) int {
+	switch c {
+	case 'b', 'f', 'n', 'r', 't', '\\', '/', '"':
+		s.step = stateInString
+		return scanContinue
+	case 'u':
+		s.step = stateInStringEscU
+		return scanContinue
+	}
+	return s.error(c, "in string escape code")
+}
+
+// stateInStringEscU is the state after reading `"\u` during a quoted string.
+func stateInStringEscU(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU1
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU1 is the state after reading `"\u1` during a quoted string.
+func stateInStringEscU1(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU12
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU12 is the state after reading `"\u12` during a quoted string.
+func stateInStringEscU12(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInStringEscU123
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateInStringEscU123 is the state after reading `"\u123` during a quoted string.
+func stateInStringEscU123(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' || 'a' <= c && c <= 'f' || 'A' <= c && c <= 'F' {
+		s.step = stateInString
+		return scanContinue
+	}
+	// numbers
+	return s.error(c, "in \\u hexadecimal character escape")
+}
+
+// stateNeg is the state after reading `-` during a number.
+func stateNeg(s *scanner, c byte) int {
+	if c == '0' {
+		s.step = state0
+		return scanContinue
+	}
+	if '1' <= c && c <= '9' {
+		s.step = state1
+		return scanContinue
+	}
+	return s.error(c, "in numeric literal")
+}
+
+// state1 is the state after reading a non-zero integer during a number,
+// such as after reading `1` or `100` but not `0`.
+func state1(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = state1
+		return scanContinue
+	}
+	return state0(s, c)
+}
+
+// state0 is the state after reading `0` during a number.
+func state0(s *scanner, c byte) int {
+	if c == '.' {
+		s.step = stateDot
+		return scanContinue
+	}
+	if c == 'e' || c == 'E' {
+		s.step = stateE
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateDot is the state after reading the integer and decimal point in a number,
+// such as after reading `1.`.
+func stateDot(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = stateDot0
+		return scanContinue
+	}
+	return s.error(c, "after decimal point in numeric literal")
+}
+
+// stateDot0 is the state after reading the integer, decimal point, and subsequent
+// digits of a number, such as after reading `3.14`.
+func stateDot0(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		return scanContinue
+	}
+	if c == 'e' || c == 'E' {
+		s.step = stateE
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateE is the state after reading the mantissa and e in a number,
+// such as after reading `314e` or `0.314e`.
+func stateE(s *scanner, c byte) int {
+	if c == '+' || c == '-' {
+		s.step = stateESign
+		return scanContinue
+	}
+	return stateESign(s, c)
+}
+
+// stateESign is the state after reading the mantissa, e, and sign in a number,
+// such as after reading `314e-` or `0.314e+`.
+func stateESign(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		s.step = stateE0
+		return scanContinue
+	}
+	return s.error(c, "in exponent of numeric literal")
+}
+
+// stateE0 is the state after reading the mantissa, e, optional sign,
+// and at least one digit of the exponent in a number,
+// such as after reading `314e-2` or `0.314e+1` or `3.14e0`.
+func stateE0(s *scanner, c byte) int {
+	if '0' <= c && c <= '9' {
+		return scanContinue
+	}
+	return stateEndValue(s, c)
+}
+
+// stateT is the state after reading `t`.
+func stateT(s *scanner, c byte) int {
+	if c == 'r' {
+		s.step = stateTr
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'r')")
+}
+
+// stateTr is the state after reading `tr`.
+func stateTr(s *scanner, c byte) int {
+	if c == 'u' {
+		s.step = stateTru
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'u')")
+}
+
+// stateTru is the state after reading `tru`.
+func stateTru(s *scanner, c byte) int {
+	if c == 'e' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal true (expecting 'e')")
+}
+
+// stateF is the state after reading `f`.
+func stateF(s *scanner, c byte) int {
+	if c == 'a' {
+		s.step = stateFa
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'a')")
+}
+
+// stateFa is the state after reading `fa`.
+func stateFa(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateFal
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'l')")
+}
+
+// stateFal is the state after reading `fal`.
+func stateFal(s *scanner, c byte) int {
+	if c == 's' {
+		s.step = stateFals
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 's')")
+}
+
+// stateFals is the state after reading `fals`.
+func stateFals(s *scanner, c byte) int {
+	if c == 'e' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal false (expecting 'e')")
+}
+
+// stateN is the state after reading `n`.
+func stateN(s *scanner, c byte) int {
+	if c == 'u' {
+		s.step = stateNu
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'u')")
+}
+
+// stateNu is the state after reading `nu`.
+func stateNu(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateNul
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'l')")
+}
+
+// stateNul is the state after reading `nul`.
+func stateNul(s *scanner, c byte) int {
+	if c == 'l' {
+		s.step = stateEndValue
+		return scanContinue
+	}
+	return s.error(c, "in literal null (expecting 'l')")
+}
+
+// stateError is the state after reaching a syntax error,
+// such as after reading `[1}` or `5.1.2`.
+func stateError(s *scanner, c byte) int {
+	return scanError
+}
+
+// error records an error and switches to the error state.
+func (s *scanner) error(c byte, context string) int {
+	s.step = stateError
+	s.err = &SyntaxError{"invalid character " + quoteChar(c) + " " + context, s.bytes}
+	return scanError
+}
+
+// quoteChar formats c as a quoted character literal
+func quoteChar(c byte) string {
+	// special cases - different from quoted strings
+	if c == '\'' {
+		return `'\''`
+	}
+	if c == '"' {
+		return `'"'`
+	}
+
+	// use quoted string with different quotation marks
+	s := strconv.Quote(string(c))
+	return "'" + s[1:len(s)-1] + "'"
+}
+
+// undo causes the scanner to return scanCode from the next state transition.
+// This gives callers a simple 1-byte undo mechanism.
+func (s *scanner) undo(scanCode int) {
+	if s.redo {
+		panic("json: invalid use of scanner")
+	}
+	s.redoCode = scanCode
+	s.redoState = s.step
+	s.step = stateRedo
+	s.redo = true
+}
+
+// stateRedo helps implement the scanner's 1-byte undo.
+func stateRedo(s *scanner, c byte) int {
+	s.redo = false
+	s.step = s.redoState
+	return s.redoCode
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/scanner_test.go

@@ -0,0 +1,316 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"math"
+	"math/rand"
+	"reflect"
+	"testing"
+)
+
+// Tests of simple examples.
+
+type example struct {
+	compact string
+	indent  string
+}
+
+var examples = []example{
+	{`1`, `1`},
+	{`{}`, `{}`},
+	{`[]`, `[]`},
+	{`{"":2}`, "{\n\t\"\": 2\n}"},
+	{`[3]`, "[\n\t3\n]"},
+	{`[1,2,3]`, "[\n\t1,\n\t2,\n\t3\n]"},
+	{`{"x":1}`, "{\n\t\"x\": 1\n}"},
+	{ex1, ex1i},
+}
+
+var ex1 = `[true,false,null,"x",1,1.5,0,-5e+2]`
+
+var ex1i = `[
+	true,
+	false,
+	null,
+	"x",
+	1,
+	1.5,
+	0,
+	-5e+2
+]`
+
+func TestCompact(t *testing.T) {
+	var buf bytes.Buffer
+	for _, tt := range examples {
+		buf.Reset()
+		if err := Compact(&buf, []byte(tt.compact)); err != nil {
+			t.Errorf("Compact(%#q): %v", tt.compact, err)
+		} else if s := buf.String(); s != tt.compact {
+			t.Errorf("Compact(%#q) = %#q, want original", tt.compact, s)
+		}
+
+		buf.Reset()
+		if err := Compact(&buf, []byte(tt.indent)); err != nil {
+			t.Errorf("Compact(%#q): %v", tt.indent, err)
+			continue
+		} else if s := buf.String(); s != tt.compact {
+			t.Errorf("Compact(%#q) = %#q, want %#q", tt.indent, s, tt.compact)
+		}
+	}
+}
+
+func TestCompactSeparators(t *testing.T) {
+	// U+2028 and U+2029 should be escaped inside strings.
+	// They should not appear outside strings.
+	tests := []struct {
+		in, compact string
+	}{
+		{"{\"\u2028\": 1}", `{"\u2028":1}`},
+		{"{\"\u2029\" :2}", `{"\u2029":2}`},
+	}
+	for _, tt := range tests {
+		var buf bytes.Buffer
+		if err := Compact(&buf, []byte(tt.in)); err != nil {
+			t.Errorf("Compact(%q): %v", tt.in, err)
+		} else if s := buf.String(); s != tt.compact {
+			t.Errorf("Compact(%q) = %q, want %q", tt.in, s, tt.compact)
+		}
+	}
+}
+
+func TestIndent(t *testing.T) {
+	var buf bytes.Buffer
+	for _, tt := range examples {
+		buf.Reset()
+		if err := Indent(&buf, []byte(tt.indent), "", "\t"); err != nil {
+			t.Errorf("Indent(%#q): %v", tt.indent, err)
+		} else if s := buf.String(); s != tt.indent {
+			t.Errorf("Indent(%#q) = %#q, want original", tt.indent, s)
+		}
+
+		buf.Reset()
+		if err := Indent(&buf, []byte(tt.compact), "", "\t"); err != nil {
+			t.Errorf("Indent(%#q): %v", tt.compact, err)
+			continue
+		} else if s := buf.String(); s != tt.indent {
+			t.Errorf("Indent(%#q) = %#q, want %#q", tt.compact, s, tt.indent)
+		}
+	}
+}
+
+// Tests of a large random structure.
+
+func TestCompactBig(t *testing.T) {
+	initBig()
+	var buf bytes.Buffer
+	if err := Compact(&buf, jsonBig); err != nil {
+		t.Fatalf("Compact: %v", err)
+	}
+	b := buf.Bytes()
+	if !bytes.Equal(b, jsonBig) {
+		t.Error("Compact(jsonBig) != jsonBig")
+		diff(t, b, jsonBig)
+		return
+	}
+}
+
+func TestIndentBig(t *testing.T) {
+	initBig()
+	var buf bytes.Buffer
+	if err := Indent(&buf, jsonBig, "", "\t"); err != nil {
+		t.Fatalf("Indent1: %v", err)
+	}
+	b := buf.Bytes()
+	if len(b) == len(jsonBig) {
+		// jsonBig is compact (no unnecessary spaces);
+		// indenting should make it bigger
+		t.Fatalf("Indent(jsonBig) did not get bigger")
+	}
+
+	// should be idempotent
+	var buf1 bytes.Buffer
+	if err := Indent(&buf1, b, "", "\t"); err != nil {
+		t.Fatalf("Indent2: %v", err)
+	}
+	b1 := buf1.Bytes()
+	if !bytes.Equal(b1, b) {
+		t.Error("Indent(Indent(jsonBig)) != Indent(jsonBig)")
+		diff(t, b1, b)
+		return
+	}
+
+	// should get back to original
+	buf1.Reset()
+	if err := Compact(&buf1, b); err != nil {
+		t.Fatalf("Compact: %v", err)
+	}
+	b1 = buf1.Bytes()
+	if !bytes.Equal(b1, jsonBig) {
+		t.Error("Compact(Indent(jsonBig)) != jsonBig")
+		diff(t, b1, jsonBig)
+		return
+	}
+}
+
+type indentErrorTest struct {
+	in  string
+	err error
+}
+
+var indentErrorTests = []indentErrorTest{
+	{`{"X": "foo", "Y"}`, &SyntaxError{"invalid character '}' after object key", 17}},
+	{`{"X": "foo" "Y": "bar"}`, &SyntaxError{"invalid character '\"' after object key:value pair", 13}},
+}
+
+func TestIndentErrors(t *testing.T) {
+	for i, tt := range indentErrorTests {
+		slice := make([]uint8, 0)
+		buf := bytes.NewBuffer(slice)
+		if err := Indent(buf, []uint8(tt.in), "", ""); err != nil {
+			if !reflect.DeepEqual(err, tt.err) {
+				t.Errorf("#%d: Indent: %#v", i, err)
+				continue
+			}
+		}
+	}
+}
+
+func TestNextValueBig(t *testing.T) {
+	initBig()
+	var scan scanner
+	item, rest, err := nextValue(jsonBig, &scan)
+	if err != nil {
+		t.Fatalf("nextValue: %s", err)
+	}
+	if len(item) != len(jsonBig) || &item[0] != &jsonBig[0] {
+		t.Errorf("invalid item: %d %d", len(item), len(jsonBig))
+	}
+	if len(rest) != 0 {
+		t.Errorf("invalid rest: %d", len(rest))
+	}
+
+	item, rest, err = nextValue(append(jsonBig, "HELLO WORLD"...), &scan)
+	if err != nil {
+		t.Fatalf("nextValue extra: %s", err)
+	}
+	if len(item) != len(jsonBig) {
+		t.Errorf("invalid item: %d %d", len(item), len(jsonBig))
+	}
+	if string(rest) != "HELLO WORLD" {
+		t.Errorf("invalid rest: %d", len(rest))
+	}
+}
+
+var benchScan scanner
+
+func BenchmarkSkipValue(b *testing.B) {
+	initBig()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		nextValue(jsonBig, &benchScan)
+	}
+	b.SetBytes(int64(len(jsonBig)))
+}
+
+func diff(t *testing.T, a, b []byte) {
+	for i := 0; ; i++ {
+		if i >= len(a) || i >= len(b) || a[i] != b[i] {
+			j := i - 10
+			if j < 0 {
+				j = 0
+			}
+			t.Errorf("diverge at %d: «%s» vs «%s»", i, trim(a[j:]), trim(b[j:]))
+			return
+		}
+	}
+}
+
+func trim(b []byte) []byte {
+	if len(b) > 20 {
+		return b[0:20]
+	}
+	return b
+}
+
+// Generate a random JSON object.
+
+var jsonBig []byte
+
+func initBig() {
+	n := 10000
+	if testing.Short() {
+		n = 100
+	}
+	b, err := Marshal(genValue(n))
+	if err != nil {
+		panic(err)
+	}
+	jsonBig = b
+}
+
+func genValue(n int) interface{} {
+	if n > 1 {
+		switch rand.Intn(2) {
+		case 0:
+			return genArray(n)
+		case 1:
+			return genMap(n)
+		}
+	}
+	switch rand.Intn(3) {
+	case 0:
+		return rand.Intn(2) == 0
+	case 1:
+		return rand.NormFloat64()
+	case 2:
+		return genString(30)
+	}
+	panic("unreachable")
+}
+
+func genString(stddev float64) string {
+	n := int(math.Abs(rand.NormFloat64()*stddev + stddev/2))
+	c := make([]rune, n)
+	for i := range c {
+		f := math.Abs(rand.NormFloat64()*64 + 32)
+		if f > 0x10ffff {
+			f = 0x10ffff
+		}
+		c[i] = rune(f)
+	}
+	return string(c)
+}
+
+func genArray(n int) []interface{} {
+	f := int(math.Abs(rand.NormFloat64()) * math.Min(10, float64(n/2)))
+	if f > n {
+		f = n
+	}
+	if f < 1 {
+		f = 1
+	}
+	x := make([]interface{}, f)
+	for i := range x {
+		x[i] = genValue(((i+1)*n)/f - (i*n)/f)
+	}
+	return x
+}
+
+func genMap(n int) map[string]interface{} {
+	f := int(math.Abs(rand.NormFloat64()) * math.Min(10, float64(n/2)))
+	if f > n {
+		f = n
+	}
+	if n > 0 && f == 0 {
+		f = 1
+	}
+	x := make(map[string]interface{})
+	for i := 0; i < f; i++ {
+		x[genString(10)] = genValue(((i+1)*n)/f - (i*n)/f)
+	}
+	return x
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/stream.go

@@ -0,0 +1,480 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"errors"
+	"io"
+)
+
+// A Decoder reads and decodes JSON objects from an input stream.
+type Decoder struct {
+	r     io.Reader
+	buf   []byte
+	d     decodeState
+	scanp int // start of unread data in buf
+	scan  scanner
+	err   error
+
+	tokenState int
+	tokenStack []int
+}
+
+// NewDecoder returns a new decoder that reads from r.
+//
+// The decoder introduces its own buffering and may
+// read data from r beyond the JSON values requested.
+func NewDecoder(r io.Reader) *Decoder {
+	return &Decoder{r: r}
+}
+
+// UseNumber causes the Decoder to unmarshal a number into an interface{} as a
+// Number instead of as a float64.
+func (dec *Decoder) UseNumber() { dec.d.useNumber = true }
+
+// Decode reads the next JSON-encoded value from its
+// input and stores it in the value pointed to by v.
+//
+// See the documentation for Unmarshal for details about
+// the conversion of JSON into a Go value.
+func (dec *Decoder) Decode(v interface{}) error {
+	if dec.err != nil {
+		return dec.err
+	}
+
+	if err := dec.tokenPrepareForDecode(); err != nil {
+		return err
+	}
+
+	if !dec.tokenValueAllowed() {
+		return &SyntaxError{msg: "not at beginning of value"}
+	}
+
+	// Read whole value into buffer.
+	n, err := dec.readValue()
+	if err != nil {
+		return err
+	}
+	dec.d.init(dec.buf[dec.scanp : dec.scanp+n])
+	dec.scanp += n
+
+	// Don't save err from unmarshal into dec.err:
+	// the connection is still usable since we read a complete JSON
+	// object from it before the error happened.
+	err = dec.d.unmarshal(v)
+
+	// fixup token streaming state
+	dec.tokenValueEnd()
+
+	return err
+}
+
+// Buffered returns a reader of the data remaining in the Decoder's
+// buffer. The reader is valid until the next call to Decode.
+func (dec *Decoder) Buffered() io.Reader {
+	return bytes.NewReader(dec.buf[dec.scanp:])
+}
+
+// readValue reads a JSON value into dec.buf.
+// It returns the length of the encoding.
+func (dec *Decoder) readValue() (int, error) {
+	dec.scan.reset()
+
+	scanp := dec.scanp
+	var err error
+Input:
+	for {
+		// Look in the buffer for a new value.
+		for i, c := range dec.buf[scanp:] {
+			dec.scan.bytes++
+			v := dec.scan.step(&dec.scan, c)
+			if v == scanEnd {
+				scanp += i
+				break Input
+			}
+			// scanEnd is delayed one byte.
+			// We might block trying to get that byte from src,
+			// so instead invent a space byte.
+			if (v == scanEndObject || v == scanEndArray) && dec.scan.step(&dec.scan, ' ') == scanEnd {
+				scanp += i + 1
+				break Input
+			}
+			if v == scanError {
+				dec.err = dec.scan.err
+				return 0, dec.scan.err
+			}
+		}
+		scanp = len(dec.buf)
+
+		// Did the last read have an error?
+		// Delayed until now to allow buffer scan.
+		if err != nil {
+			if err == io.EOF {
+				if dec.scan.step(&dec.scan, ' ') == scanEnd {
+					break Input
+				}
+				if nonSpace(dec.buf) {
+					err = io.ErrUnexpectedEOF
+				}
+			}
+			dec.err = err
+			return 0, err
+		}
+
+		n := scanp - dec.scanp
+		err = dec.refill()
+		scanp = dec.scanp + n
+	}
+	return scanp - dec.scanp, nil
+}
+
+func (dec *Decoder) refill() error {
+	// Make room to read more into the buffer.
+	// First slide down data already consumed.
+	if dec.scanp > 0 {
+		n := copy(dec.buf, dec.buf[dec.scanp:])
+		dec.buf = dec.buf[:n]
+		dec.scanp = 0
+	}
+
+	// Grow buffer if not large enough.
+	const minRead = 512
+	if cap(dec.buf)-len(dec.buf) < minRead {
+		newBuf := make([]byte, len(dec.buf), 2*cap(dec.buf)+minRead)
+		copy(newBuf, dec.buf)
+		dec.buf = newBuf
+	}
+
+	// Read.  Delay error for next iteration (after scan).
+	n, err := dec.r.Read(dec.buf[len(dec.buf):cap(dec.buf)])
+	dec.buf = dec.buf[0 : len(dec.buf)+n]
+
+	return err
+}
+
+func nonSpace(b []byte) bool {
+	for _, c := range b {
+		if !isSpace(c) {
+			return true
+		}
+	}
+	return false
+}
+
+// An Encoder writes JSON objects to an output stream.
+type Encoder struct {
+	w   io.Writer
+	err error
+}
+
+// NewEncoder returns a new encoder that writes to w.
+func NewEncoder(w io.Writer) *Encoder {
+	return &Encoder{w: w}
+}
+
+// Encode writes the JSON encoding of v to the stream,
+// followed by a newline character.
+//
+// See the documentation for Marshal for details about the
+// conversion of Go values to JSON.
+func (enc *Encoder) Encode(v interface{}) error {
+	if enc.err != nil {
+		return enc.err
+	}
+	e := newEncodeState()
+	err := e.marshal(v)
+	if err != nil {
+		return err
+	}
+
+	// Terminate each value with a newline.
+	// This makes the output look a little nicer
+	// when debugging, and some kind of space
+	// is required if the encoded value was a number,
+	// so that the reader knows there aren't more
+	// digits coming.
+	e.WriteByte('\n')
+
+	if _, err = enc.w.Write(e.Bytes()); err != nil {
+		enc.err = err
+	}
+	encodeStatePool.Put(e)
+	return err
+}
+
+// RawMessage is a raw encoded JSON object.
+// It implements Marshaler and Unmarshaler and can
+// be used to delay JSON decoding or precompute a JSON encoding.
+type RawMessage []byte
+
+// MarshalJSON returns *m as the JSON encoding of m.
+func (m *RawMessage) MarshalJSON() ([]byte, error) {
+	return *m, nil
+}
+
+// UnmarshalJSON sets *m to a copy of data.
+func (m *RawMessage) UnmarshalJSON(data []byte) error {
+	if m == nil {
+		return errors.New("json.RawMessage: UnmarshalJSON on nil pointer")
+	}
+	*m = append((*m)[0:0], data...)
+	return nil
+}
+
+var _ Marshaler = (*RawMessage)(nil)
+var _ Unmarshaler = (*RawMessage)(nil)
+
+// A Token holds a value of one of these types:
+//
+//	Delim, for the four JSON delimiters [ ] { }
+//	bool, for JSON booleans
+//	float64, for JSON numbers
+//	Number, for JSON numbers
+//	string, for JSON string literals
+//	nil, for JSON null
+//
+type Token interface{}
+
+const (
+	tokenTopValue = iota
+	tokenArrayStart
+	tokenArrayValue
+	tokenArrayComma
+	tokenObjectStart
+	tokenObjectKey
+	tokenObjectColon
+	tokenObjectValue
+	tokenObjectComma
+)
+
+// advance tokenstate from a separator state to a value state
+func (dec *Decoder) tokenPrepareForDecode() error {
+	// Note: Not calling peek before switch, to avoid
+	// putting peek into the standard Decode path.
+	// peek is only called when using the Token API.
+	switch dec.tokenState {
+	case tokenArrayComma:
+		c, err := dec.peek()
+		if err != nil {
+			return err
+		}
+		if c != ',' {
+			return &SyntaxError{"expected comma after array element", 0}
+		}
+		dec.scanp++
+		dec.tokenState = tokenArrayValue
+	case tokenObjectColon:
+		c, err := dec.peek()
+		if err != nil {
+			return err
+		}
+		if c != ':' {
+			return &SyntaxError{"expected colon after object key", 0}
+		}
+		dec.scanp++
+		dec.tokenState = tokenObjectValue
+	}
+	return nil
+}
+
+func (dec *Decoder) tokenValueAllowed() bool {
+	switch dec.tokenState {
+	case tokenTopValue, tokenArrayStart, tokenArrayValue, tokenObjectValue:
+		return true
+	}
+	return false
+}
+
+func (dec *Decoder) tokenValueEnd() {
+	switch dec.tokenState {
+	case tokenArrayStart, tokenArrayValue:
+		dec.tokenState = tokenArrayComma
+	case tokenObjectValue:
+		dec.tokenState = tokenObjectComma
+	}
+}
+
+// A Delim is a JSON array or object delimiter, one of [ ] { or }.
+type Delim rune
+
+func (d Delim) String() string {
+	return string(d)
+}
+
+// Token returns the next JSON token in the input stream.
+// At the end of the input stream, Token returns nil, io.EOF.
+//
+// Token guarantees that the delimiters [ ] { } it returns are
+// properly nested and matched: if Token encounters an unexpected
+// delimiter in the input, it will return an error.
+//
+// The input stream consists of basic JSON values—bool, string,
+// number, and null—along with delimiters [ ] { } of type Delim
+// to mark the start and end of arrays and objects.
+// Commas and colons are elided.
+func (dec *Decoder) Token() (Token, error) {
+	for {
+		c, err := dec.peek()
+		if err != nil {
+			return nil, err
+		}
+		switch c {
+		case '[':
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
+			dec.tokenState = tokenArrayStart
+			return Delim('['), nil
+
+		case ']':
+			if dec.tokenState != tokenArrayStart && dec.tokenState != tokenArrayComma {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
+			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
+			dec.tokenValueEnd()
+			return Delim(']'), nil
+
+		case '{':
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenStack = append(dec.tokenStack, dec.tokenState)
+			dec.tokenState = tokenObjectStart
+			return Delim('{'), nil
+
+		case '}':
+			if dec.tokenState != tokenObjectStart && dec.tokenState != tokenObjectComma {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = dec.tokenStack[len(dec.tokenStack)-1]
+			dec.tokenStack = dec.tokenStack[:len(dec.tokenStack)-1]
+			dec.tokenValueEnd()
+			return Delim('}'), nil
+
+		case ':':
+			if dec.tokenState != tokenObjectColon {
+				return dec.tokenError(c)
+			}
+			dec.scanp++
+			dec.tokenState = tokenObjectValue
+			continue
+
+		case ',':
+			if dec.tokenState == tokenArrayComma {
+				dec.scanp++
+				dec.tokenState = tokenArrayValue
+				continue
+			}
+			if dec.tokenState == tokenObjectComma {
+				dec.scanp++
+				dec.tokenState = tokenObjectKey
+				continue
+			}
+			return dec.tokenError(c)
+
+		case '"':
+			if dec.tokenState == tokenObjectStart || dec.tokenState == tokenObjectKey {
+				var x string
+				old := dec.tokenState
+				dec.tokenState = tokenTopValue
+				err := dec.Decode(&x)
+				dec.tokenState = old
+				if err != nil {
+					clearOffset(err)
+					return nil, err
+				}
+				dec.tokenState = tokenObjectColon
+				return x, nil
+			}
+			fallthrough
+
+		default:
+			if !dec.tokenValueAllowed() {
+				return dec.tokenError(c)
+			}
+			var x interface{}
+			if err := dec.Decode(&x); err != nil {
+				clearOffset(err)
+				return nil, err
+			}
+			return x, nil
+		}
+	}
+}
+
+func clearOffset(err error) {
+	if s, ok := err.(*SyntaxError); ok {
+		s.Offset = 0
+	}
+}
+
+func (dec *Decoder) tokenError(c byte) (Token, error) {
+	var context string
+	switch dec.tokenState {
+	case tokenTopValue:
+		context = " looking for beginning of value"
+	case tokenArrayStart, tokenArrayValue, tokenObjectValue:
+		context = " looking for beginning of value"
+	case tokenArrayComma:
+		context = " after array element"
+	case tokenObjectKey:
+		context = " looking for beginning of object key string"
+	case tokenObjectColon:
+		context = " after object key"
+	case tokenObjectComma:
+		context = " after object key:value pair"
+	}
+	return nil, &SyntaxError{"invalid character " + quoteChar(c) + " " + context, 0}
+}
+
+// More reports whether there is another element in the
+// current array or object being parsed.
+func (dec *Decoder) More() bool {
+	c, err := dec.peek()
+	return err == nil && c != ']' && c != '}'
+}
+
+func (dec *Decoder) peek() (byte, error) {
+	var err error
+	for {
+		for i := dec.scanp; i < len(dec.buf); i++ {
+			c := dec.buf[i]
+			if isSpace(c) {
+				continue
+			}
+			dec.scanp = i
+			return c, nil
+		}
+		// buffer has been scanned, now report any error
+		if err != nil {
+			return 0, err
+		}
+		err = dec.refill()
+	}
+}
+
+/*
+TODO
+
+// EncodeToken writes the given JSON token to the stream.
+// It returns an error if the delimiters [ ] { } are not properly used.
+//
+// EncodeToken does not call Flush, because usually it is part of
+// a larger operation such as Encode, and those will call Flush when finished.
+// Callers that create an Encoder and then invoke EncodeToken directly,
+// without using Encode, need to call Flush when finished to ensure that
+// the JSON is written to the underlying writer.
+func (e *Encoder) EncodeToken(t Token) error  {
+	...
+}
+
+*/

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/stream_test.go

@@ -0,0 +1,354 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+// Test values for the stream test.
+// One of each JSON kind.
+var streamTest = []interface{}{
+	0.1,
+	"hello",
+	nil,
+	true,
+	false,
+	[]interface{}{"a", "b", "c"},
+	map[string]interface{}{"K": "Kelvin", "ß": "long s"},
+	3.14, // another value to make sure something can follow map
+}
+
+var streamEncoded = `0.1
+"hello"
+null
+true
+false
+["a","b","c"]
+{"ß":"long s","K":"Kelvin"}
+3.14
+`
+
+func TestEncoder(t *testing.T) {
+	for i := 0; i <= len(streamTest); i++ {
+		var buf bytes.Buffer
+		enc := NewEncoder(&buf)
+		for j, v := range streamTest[0:i] {
+			if err := enc.Encode(v); err != nil {
+				t.Fatalf("encode #%d: %v", j, err)
+			}
+		}
+		if have, want := buf.String(), nlines(streamEncoded, i); have != want {
+			t.Errorf("encoding %d items: mismatch", i)
+			diff(t, []byte(have), []byte(want))
+			break
+		}
+	}
+}
+
+func TestDecoder(t *testing.T) {
+	for i := 0; i <= len(streamTest); i++ {
+		// Use stream without newlines as input,
+		// just to stress the decoder even more.
+		// Our test input does not include back-to-back numbers.
+		// Otherwise stripping the newlines would
+		// merge two adjacent JSON values.
+		var buf bytes.Buffer
+		for _, c := range nlines(streamEncoded, i) {
+			if c != '\n' {
+				buf.WriteRune(c)
+			}
+		}
+		out := make([]interface{}, i)
+		dec := NewDecoder(&buf)
+		for j := range out {
+			if err := dec.Decode(&out[j]); err != nil {
+				t.Fatalf("decode #%d/%d: %v", j, i, err)
+			}
+		}
+		if !reflect.DeepEqual(out, streamTest[0:i]) {
+			t.Errorf("decoding %d items: mismatch", i)
+			for j := range out {
+				if !reflect.DeepEqual(out[j], streamTest[j]) {
+					t.Errorf("#%d: have %v want %v", j, out[j], streamTest[j])
+				}
+			}
+			break
+		}
+	}
+}
+
+func TestDecoderBuffered(t *testing.T) {
+	r := strings.NewReader(`{"Name": "Gopher"} extra `)
+	var m struct {
+		Name string
+	}
+	d := NewDecoder(r)
+	err := d.Decode(&m)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if m.Name != "Gopher" {
+		t.Errorf("Name = %q; want Gopher", m.Name)
+	}
+	rest, err := ioutil.ReadAll(d.Buffered())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if g, w := string(rest), " extra "; g != w {
+		t.Errorf("Remaining = %q; want %q", g, w)
+	}
+}
+
+func nlines(s string, n int) string {
+	if n <= 0 {
+		return ""
+	}
+	for i, c := range s {
+		if c == '\n' {
+			if n--; n == 0 {
+				return s[0 : i+1]
+			}
+		}
+	}
+	return s
+}
+
+func TestRawMessage(t *testing.T) {
+	// TODO(rsc): Should not need the * in *RawMessage
+	var data struct {
+		X  float64
+		Id *RawMessage
+		Y  float32
+	}
+	const raw = `["\u0056",null]`
+	const msg = `{"X":0.1,"Id":["\u0056",null],"Y":0.2}`
+	err := Unmarshal([]byte(msg), &data)
+	if err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	if string([]byte(*data.Id)) != raw {
+		t.Fatalf("Raw mismatch: have %#q want %#q", []byte(*data.Id), raw)
+	}
+	b, err := Marshal(&data)
+	if err != nil {
+		t.Fatalf("Marshal: %v", err)
+	}
+	if string(b) != msg {
+		t.Fatalf("Marshal: have %#q want %#q", b, msg)
+	}
+}
+
+func TestNullRawMessage(t *testing.T) {
+	// TODO(rsc): Should not need the * in *RawMessage
+	var data struct {
+		X  float64
+		Id *RawMessage
+		Y  float32
+	}
+	data.Id = new(RawMessage)
+	const msg = `{"X":0.1,"Id":null,"Y":0.2}`
+	err := Unmarshal([]byte(msg), &data)
+	if err != nil {
+		t.Fatalf("Unmarshal: %v", err)
+	}
+	if data.Id != nil {
+		t.Fatalf("Raw mismatch: have non-nil, want nil")
+	}
+	b, err := Marshal(&data)
+	if err != nil {
+		t.Fatalf("Marshal: %v", err)
+	}
+	if string(b) != msg {
+		t.Fatalf("Marshal: have %#q want %#q", b, msg)
+	}
+}
+
+var blockingTests = []string{
+	`{"x": 1}`,
+	`[1, 2, 3]`,
+}
+
+func TestBlocking(t *testing.T) {
+	for _, enc := range blockingTests {
+		r, w := net.Pipe()
+		go w.Write([]byte(enc))
+		var val interface{}
+
+		// If Decode reads beyond what w.Write writes above,
+		// it will block, and the test will deadlock.
+		if err := NewDecoder(r).Decode(&val); err != nil {
+			t.Errorf("decoding %s: %v", enc, err)
+		}
+		r.Close()
+		w.Close()
+	}
+}
+
+func BenchmarkEncoderEncode(b *testing.B) {
+	b.ReportAllocs()
+	type T struct {
+		X, Y string
+	}
+	v := &T{"foo", "bar"}
+	for i := 0; i < b.N; i++ {
+		if err := NewEncoder(ioutil.Discard).Encode(v); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+type tokenStreamCase struct {
+	json      string
+	expTokens []interface{}
+}
+
+type decodeThis struct {
+	v interface{}
+}
+
+var tokenStreamCases []tokenStreamCase = []tokenStreamCase{
+	// streaming token cases
+	{json: `10`, expTokens: []interface{}{float64(10)}},
+	{json: ` [10] `, expTokens: []interface{}{
+		Delim('['), float64(10), Delim(']')}},
+	{json: ` [false,10,"b"] `, expTokens: []interface{}{
+		Delim('['), false, float64(10), "b", Delim(']')}},
+	{json: `{ "a": 1 }`, expTokens: []interface{}{
+		Delim('{'), "a", float64(1), Delim('}')}},
+	{json: `{"a": 1, "b":"3"}`, expTokens: []interface{}{
+		Delim('{'), "a", float64(1), "b", "3", Delim('}')}},
+	{json: ` [{"a": 1},{"a": 2}] `, expTokens: []interface{}{
+		Delim('['),
+		Delim('{'), "a", float64(1), Delim('}'),
+		Delim('{'), "a", float64(2), Delim('}'),
+		Delim(']')}},
+	{json: `{"obj": {"a": 1}}`, expTokens: []interface{}{
+		Delim('{'), "obj", Delim('{'), "a", float64(1), Delim('}'),
+		Delim('}')}},
+	{json: `{"obj": [{"a": 1}]}`, expTokens: []interface{}{
+		Delim('{'), "obj", Delim('['),
+		Delim('{'), "a", float64(1), Delim('}'),
+		Delim(']'), Delim('}')}},
+
+	// streaming tokens with intermittent Decode()
+	{json: `{ "a": 1 }`, expTokens: []interface{}{
+		Delim('{'), "a",
+		decodeThis{float64(1)},
+		Delim('}')}},
+	{json: ` [ { "a" : 1 } ] `, expTokens: []interface{}{
+		Delim('['),
+		decodeThis{map[string]interface{}{"a": float64(1)}},
+		Delim(']')}},
+	{json: ` [{"a": 1},{"a": 2}] `, expTokens: []interface{}{
+		Delim('['),
+		decodeThis{map[string]interface{}{"a": float64(1)}},
+		decodeThis{map[string]interface{}{"a": float64(2)}},
+		Delim(']')}},
+	{json: `{ "obj" : [ { "a" : 1 } ] }`, expTokens: []interface{}{
+		Delim('{'), "obj", Delim('['),
+		decodeThis{map[string]interface{}{"a": float64(1)}},
+		Delim(']'), Delim('}')}},
+
+	{json: `{"obj": {"a": 1}}`, expTokens: []interface{}{
+		Delim('{'), "obj",
+		decodeThis{map[string]interface{}{"a": float64(1)}},
+		Delim('}')}},
+	{json: `{"obj": [{"a": 1}]}`, expTokens: []interface{}{
+		Delim('{'), "obj",
+		decodeThis{[]interface{}{
+			map[string]interface{}{"a": float64(1)},
+		}},
+		Delim('}')}},
+	{json: ` [{"a": 1} {"a": 2}] `, expTokens: []interface{}{
+		Delim('['),
+		decodeThis{map[string]interface{}{"a": float64(1)}},
+		decodeThis{&SyntaxError{"expected comma after array element", 0}},
+	}},
+	{json: `{ "a" 1 }`, expTokens: []interface{}{
+		Delim('{'), "a",
+		decodeThis{&SyntaxError{"expected colon after object key", 0}},
+	}},
+}
+
+func TestDecodeInStream(t *testing.T) {
+
+	for ci, tcase := range tokenStreamCases {
+
+		dec := NewDecoder(strings.NewReader(tcase.json))
+		for i, etk := range tcase.expTokens {
+
+			var tk interface{}
+			var err error
+
+			if dt, ok := etk.(decodeThis); ok {
+				etk = dt.v
+				err = dec.Decode(&tk)
+			} else {
+				tk, err = dec.Token()
+			}
+			if experr, ok := etk.(error); ok {
+				if err == nil || err.Error() != experr.Error() {
+					t.Errorf("case %v: Expected error %v in %q, but was %v", ci, experr, tcase.json, err)
+				}
+				break
+			} else if err == io.EOF {
+				t.Errorf("case %v: Unexpected EOF in %q", ci, tcase.json)
+				break
+			} else if err != nil {
+				t.Errorf("case %v: Unexpected error '%v' in %q", ci, err, tcase.json)
+				break
+			}
+			if !reflect.DeepEqual(tk, etk) {
+				t.Errorf(`case %v: %q @ %v expected %T(%v) was %T(%v)`, ci, tcase.json, i, etk, etk, tk, tk)
+				break
+			}
+		}
+	}
+
+}
+
+// Test from golang.org/issue/11893
+func TestHTTPDecoding(t *testing.T) {
+	const raw = `{ "foo": "bar" }`
+
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(raw))
+	}))
+	defer ts.Close()
+	res, err := http.Get(ts.URL)
+	if err != nil {
+		log.Fatalf("GET failed: %v", err)
+	}
+	defer res.Body.Close()
+
+	foo := struct {
+		Foo string `json:"foo"`
+	}{}
+
+	d := NewDecoder(res.Body)
+	err = d.Decode(&foo)
+	if err != nil {
+		t.Fatalf("Decode: %v", err)
+	}
+	if foo.Foo != "bar" {
+		t.Errorf("decoded %q; want \"bar\"", foo.Foo)
+	}
+
+	// make sure we get the EOF the second time
+	err = d.Decode(&foo)
+	if err != io.EOF {
+		t.Errorf("err = %v; want io.EOF", err)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/tagkey_test.go

@@ -0,0 +1,115 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"testing"
+)
+
+type basicLatin2xTag struct {
+	V string `json:"$%-/"`
+}
+
+type basicLatin3xTag struct {
+	V string `json:"0123456789"`
+}
+
+type basicLatin4xTag struct {
+	V string `json:"ABCDEFGHIJKLMO"`
+}
+
+type basicLatin5xTag struct {
+	V string `json:"PQRSTUVWXYZ_"`
+}
+
+type basicLatin6xTag struct {
+	V string `json:"abcdefghijklmno"`
+}
+
+type basicLatin7xTag struct {
+	V string `json:"pqrstuvwxyz"`
+}
+
+type miscPlaneTag struct {
+	V string `json:"色は匂へど"`
+}
+
+type percentSlashTag struct {
+	V string `json:"text/html%"` // https://golang.org/issue/2718
+}
+
+type punctuationTag struct {
+	V string `json:"!#$%&()*+-./:<=>?@[]^_{|}~"` // https://golang.org/issue/3546
+}
+
+type emptyTag struct {
+	W string
+}
+
+type misnamedTag struct {
+	X string `jsom:"Misnamed"`
+}
+
+type badFormatTag struct {
+	Y string `:"BadFormat"`
+}
+
+type badCodeTag struct {
+	Z string `json:" !\"#&'()*+,."`
+}
+
+type spaceTag struct {
+	Q string `json:"With space"`
+}
+
+type unicodeTag struct {
+	W string `json:"Ελλάδα"`
+}
+
+var structTagObjectKeyTests = []struct {
+	raw   interface{}
+	value string
+	key   string
+}{
+	{basicLatin2xTag{"2x"}, "2x", "$%-/"},
+	{basicLatin3xTag{"3x"}, "3x", "0123456789"},
+	{basicLatin4xTag{"4x"}, "4x", "ABCDEFGHIJKLMO"},
+	{basicLatin5xTag{"5x"}, "5x", "PQRSTUVWXYZ_"},
+	{basicLatin6xTag{"6x"}, "6x", "abcdefghijklmno"},
+	{basicLatin7xTag{"7x"}, "7x", "pqrstuvwxyz"},
+	{miscPlaneTag{"いろはにほへと"}, "いろはにほへと", "色は匂へど"},
+	{emptyTag{"Pour Moi"}, "Pour Moi", "W"},
+	{misnamedTag{"Animal Kingdom"}, "Animal Kingdom", "X"},
+	{badFormatTag{"Orfevre"}, "Orfevre", "Y"},
+	{badCodeTag{"Reliable Man"}, "Reliable Man", "Z"},
+	{percentSlashTag{"brut"}, "brut", "text/html%"},
+	{punctuationTag{"Union Rags"}, "Union Rags", "!#$%&()*+-./:<=>?@[]^_{|}~"},
+	{spaceTag{"Perreddu"}, "Perreddu", "With space"},
+	{unicodeTag{"Loukanikos"}, "Loukanikos", "Ελλάδα"},
+}
+
+func TestStructTagObjectKey(t *testing.T) {
+	for _, tt := range structTagObjectKeyTests {
+		b, err := Marshal(tt.raw)
+		if err != nil {
+			t.Fatalf("Marshal(%#q) failed: %v", tt.raw, err)
+		}
+		var f interface{}
+		err = Unmarshal(b, &f)
+		if err != nil {
+			t.Fatalf("Unmarshal(%#q) failed: %v", b, err)
+		}
+		for i, v := range f.(map[string]interface{}) {
+			switch i {
+			case tt.key:
+				if s, ok := v.(string); !ok || s != tt.value {
+					t.Fatalf("Unexpected value: %#q, want %v", s, tt.value)
+				}
+			default:
+				t.Fatalf("Unexpected key: %#q, from %#q", i, b)
+			}
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/tags.go

@@ -0,0 +1,44 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"strings"
+)
+
+// tagOptions is the string following a comma in a struct field's "json"
+// tag, or the empty string. It does not include the leading comma.
+type tagOptions string
+
+// parseTag splits a struct field's json tag into its name and
+// comma-separated options.
+func parseTag(tag string) (string, tagOptions) {
+	if idx := strings.Index(tag, ","); idx != -1 {
+		return tag[:idx], tagOptions(tag[idx+1:])
+	}
+	return tag, tagOptions("")
+}
+
+// Contains reports whether a comma-separated list of options
+// contains a particular substr flag. substr must be surrounded by a
+// string boundary or commas.
+func (o tagOptions) Contains(optionName string) bool {
+	if len(o) == 0 {
+		return false
+	}
+	s := string(o)
+	for s != "" {
+		var next string
+		i := strings.Index(s, ",")
+		if i >= 0 {
+			s, next = s[:i], s[i+1:]
+		}
+		if s == optionName {
+			return true
+		}
+		s = next
+	}
+	return false
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json/tags_test.go

@@ -0,0 +1,28 @@
+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package json
+
+import (
+	"testing"
+)
+
+func TestTagParsing(t *testing.T) {
+	name, opts := parseTag("field,foobar,foo")
+	if name != "field" {
+		t.Fatalf("name = %q, want field", name)
+	}
+	for _, tt := range []struct {
+		opt  string
+		want bool
+	}{
+		{"foobar", true},
+		{"foo", true},
+		{"bar", false},
+	} {
+		if opts.Contains(tt.opt) != tt.want {
+			t.Errorf("Contains(%q) = %v", tt.opt, !tt.want)
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json_fork.go

@@ -0,0 +1,31 @@
+// +build !std_json
+
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"gopkg.in/square/go-jose.v1/json"
+)
+
+func MarshalJSON(v interface{}) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func UnmarshalJSON(data []byte, v interface{}) error {
+	return json.Unmarshal(data, v)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json_fork_test.go

@@ -0,0 +1,76 @@
+// +build !std_json
+
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"testing"
+)
+
+type CaseSensitive struct {
+	A int `json:"Test"`
+	B int `json:"test"`
+	C int `json:"TEST"`
+}
+
+func TestCaseSensitiveJSON(t *testing.T) {
+	raw := []byte(`{"test":42}`)
+	var cs CaseSensitive
+	err := UnmarshalJSON(raw, &cs)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if cs.A != 0 || cs.B != 42 || cs.C != 0 {
+		t.Errorf("parsing JSON should be case-sensitive (got %v)", cs)
+	}
+}
+
+func TestRejectDuplicateKeysObject(t *testing.T) {
+	raw := []byte(`{"test":42,"test":43}`)
+	var cs CaseSensitive
+	err := UnmarshalJSON(raw, &cs)
+	if err == nil {
+		t.Error("should reject JSON with duplicate keys, but didn't")
+	}
+}
+
+func TestRejectDuplicateKeysInterface(t *testing.T) {
+	raw := []byte(`{"test":42,"test":43}`)
+	var m interface{}
+	err := UnmarshalJSON(raw, &m)
+	if err == nil {
+		t.Error("should reject JSON with duplicate keys, but didn't")
+	}
+}
+
+func TestParseCaseSensitiveJWE(t *testing.T) {
+	invalidJWE := `{"protected":"eyJlbmMiOiJYWVoiLCJBTEciOiJYWVoifQo","encrypted_key":"QUJD","iv":"QUJD","ciphertext":"QUJD","tag":"QUJD"}`
+	_, err := ParseEncrypted(invalidJWE)
+	if err == nil {
+		t.Error("Able to parse message with case-invalid headers", invalidJWE)
+	}
+}
+
+func TestParseCaseSensitiveJWS(t *testing.T) {
+	invalidJWS := `{"PAYLOAD":"CUJD","signatures":[{"protected":"e30","signature":"CUJD"}]}`
+	_, err := ParseSigned(invalidJWS)
+	if err == nil {
+		t.Error("Able to parse message with case-invalid headers", invalidJWS)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json_std.go

@@ -0,0 +1,31 @@
+// +build std_json
+
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"encoding/json"
+)
+
+func MarshalJSON(v interface{}) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func UnmarshalJSON(data []byte, v interface{}) error {
+	return json.Unmarshal(data, v)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/json_std_test.go

@@ -0,0 +1,106 @@
+// +build std_json
+
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"testing"
+)
+
+type CaseInsensitive struct {
+	A int `json:"TEST"`
+}
+
+func TestCaseInsensitiveJSON(t *testing.T) {
+	raw := []byte(`{"test":42}`)
+	var ci CaseInsensitive
+	err := UnmarshalJSON(raw, &ci)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if ci.A != 42 {
+		t.Errorf("parsing JSON should be case-insensitive (got %v)", ci)
+	}
+}
+
+func TestParseCaseInsensitiveJWE(t *testing.T) {
+	invalidJWE := `{"protected":"eyJlbmMiOiJYWVoiLCJBTEciOiJYWVoifQo","encrypted_key":"QUJD","iv":"QUJD","ciphertext":"QUJD","tag":"QUJD"}`
+	_, err := ParseEncrypted(invalidJWE)
+	if err != nil {
+		t.Error("Unable to parse message with case-invalid headers", invalidJWE)
+	}
+}
+
+func TestParseCaseInsensitiveJWS(t *testing.T) {
+	invalidJWS := `{"PAYLOAD":"CUJD","signatures":[{"protected":"e30","signature":"CUJD"}]}`
+	_, err := ParseSigned(invalidJWS)
+	if err != nil {
+		t.Error("Unable to parse message with case-invalid headers", invalidJWS)
+	}
+}
+
+var JWKSetDuplicates = stripWhitespace(`{
+     "keys": [{
+         "kty": "RSA",
+         "kid": "exclude-me",
+         "use": "sig",
+         "n": "n4EPtAOCc9AlkeQHPzHStgAbgs7bTZLwUBZdR8_KuKPEHLd4rHVTeT
+             -O-XV2jRojdNhxJWTDvNd7nqQ0VEiZQHz_AJmSCpMaJMRBSFKrKb2wqV
+             wGU_NsYOYL-QtiWN2lbzcEe6XC0dApr5ydQLrHqkHHig3RBordaZ6Aj-
+             oBHqFEHYpPe7Tpe-OfVfHd1E6cS6M1FZcD1NNLYD5lFHpPI9bTwJlsde
+             3uhGqC0ZCuEHg8lhzwOHrtIQbS0FVbb9k3-tVTU4fg_3L_vniUFAKwuC
+             LqKnS2BYwdq_mzSnbLY7h_qixoR7jig3__kRhuaxwUkRz5iaiQkqgc5g
+             HdrNP5zw",
+         "e": "AQAB"
+     }],
+     "keys": [{
+         "kty": "RSA",
+         "kid": "include-me",
+         "use": "sig",
+         "n": "n4EPtAOCc9AlkeQHPzHStgAbgs7bTZLwUBZdR8_KuKPEHLd4rHVTeT
+             -O-XV2jRojdNhxJWTDvNd7nqQ0VEiZQHz_AJmSCpMaJMRBSFKrKb2wqV
+             wGU_NsYOYL-QtiWN2lbzcEe6XC0dApr5ydQLrHqkHHig3RBordaZ6Aj-
+             oBHqFEHYpPe7Tpe-OfVfHd1E6cS6M1FZcD1NNLYD5lFHpPI9bTwJlsde
+             3uhGqC0ZCuEHg8lhzwOHrtIQbS0FVbb9k3-tVTU4fg_3L_vniUFAKwuC
+             LqKnS2BYwdq_mzSnbLY7h_qixoR7jig3__kRhuaxwUkRz5iaiQkqgc5g
+             HdrNP5zw",
+         "e": "AQAB"
+     }],
+     "custom": "exclude-me",
+     "custom": "include-me"
+   }`)
+
+func TestDuplicateJWKSetMembersIgnored(t *testing.T) {
+	type CustomSet struct {
+		JsonWebKeySet
+		CustomMember string `json:"custom"`
+	}
+	data := []byte(JWKSetDuplicates)
+	var set CustomSet
+	UnmarshalJSON(data, &set)
+	if len(set.Keys) != 1 {
+		t.Error("expected only one key in set")
+	}
+	if set.Keys[0].KeyID != "include-me" {
+		t.Errorf("expected key with kid: \"include-me\", got: %s", set.Keys[0].KeyID)
+	}
+	if set.CustomMember != "include-me" {
+		t.Errorf("expected custom member value: \"include-me\", got: %s", set.CustomMember)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jwe.go

@@ -0,0 +1,278 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"fmt"
+	"strings"
+)
+
+// rawJsonWebEncryption represents a raw JWE JSON object. Used for parsing/serializing.
+type rawJsonWebEncryption struct {
+	Protected    *byteBuffer        `json:"protected,omitempty"`
+	Unprotected  *rawHeader         `json:"unprotected,omitempty"`
+	Header       *rawHeader         `json:"header,omitempty"`
+	Recipients   []rawRecipientInfo `json:"recipients,omitempty"`
+	Aad          *byteBuffer        `json:"aad,omitempty"`
+	EncryptedKey *byteBuffer        `json:"encrypted_key,omitempty"`
+	Iv           *byteBuffer        `json:"iv,omitempty"`
+	Ciphertext   *byteBuffer        `json:"ciphertext,omitempty"`
+	Tag          *byteBuffer        `json:"tag,omitempty"`
+}
+
+// rawRecipientInfo represents a raw JWE Per-Recipient header JSON object. Used for parsing/serializing.
+type rawRecipientInfo struct {
+	Header       *rawHeader `json:"header,omitempty"`
+	EncryptedKey string     `json:"encrypted_key,omitempty"`
+}
+
+// JsonWebEncryption represents an encrypted JWE object after parsing.
+type JsonWebEncryption struct {
+	Header                   JoseHeader
+	protected, unprotected   *rawHeader
+	recipients               []recipientInfo
+	aad, iv, ciphertext, tag []byte
+	original                 *rawJsonWebEncryption
+}
+
+// recipientInfo represents a raw JWE Per-Recipient header JSON object after parsing.
+type recipientInfo struct {
+	header       *rawHeader
+	encryptedKey []byte
+}
+
+// GetAuthData retrieves the (optional) authenticated data attached to the object.
+func (obj JsonWebEncryption) GetAuthData() []byte {
+	if obj.aad != nil {
+		out := make([]byte, len(obj.aad))
+		copy(out, obj.aad)
+		return out
+	}
+
+	return nil
+}
+
+// Get the merged header values
+func (obj JsonWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
+	out := rawHeader{}
+	out.merge(obj.protected)
+	out.merge(obj.unprotected)
+
+	if recipient != nil {
+		out.merge(recipient.header)
+	}
+
+	return out
+}
+
+// Get the additional authenticated data from a JWE object.
+func (obj JsonWebEncryption) computeAuthData() []byte {
+	var protected string
+
+	if obj.original != nil {
+		protected = obj.original.Protected.base64()
+	} else {
+		protected = base64URLEncode(mustSerializeJSON((obj.protected)))
+	}
+
+	output := []byte(protected)
+	if obj.aad != nil {
+		output = append(output, '.')
+		output = append(output, []byte(base64URLEncode(obj.aad))...)
+	}
+
+	return output
+}
+
+// ParseEncrypted parses an encrypted message in compact or full serialization format.
+func ParseEncrypted(input string) (*JsonWebEncryption, error) {
+	input = stripWhitespace(input)
+	if strings.HasPrefix(input, "{") {
+		return parseEncryptedFull(input)
+	}
+
+	return parseEncryptedCompact(input)
+}
+
+// parseEncryptedFull parses a message in compact format.
+func parseEncryptedFull(input string) (*JsonWebEncryption, error) {
+	var parsed rawJsonWebEncryption
+	err := UnmarshalJSON([]byte(input), &parsed)
+	if err != nil {
+		return nil, err
+	}
+
+	return parsed.sanitized()
+}
+
+// sanitized produces a cleaned-up JWE object from the raw JSON.
+func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
+	obj := &JsonWebEncryption{
+		original:    parsed,
+		unprotected: parsed.Unprotected,
+	}
+
+	// Check that there is not a nonce in the unprotected headers
+	if (parsed.Unprotected != nil && parsed.Unprotected.Nonce != "") ||
+		(parsed.Header != nil && parsed.Header.Nonce != "") {
+		return nil, ErrUnprotectedNonce
+	}
+
+	if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
+		err := UnmarshalJSON(parsed.Protected.bytes(), &obj.protected)
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid protected header: %s, %s", err, parsed.Protected.base64())
+		}
+	}
+
+	// Note: this must be called _after_ we parse the protected header,
+	// otherwise fields from the protected header will not get picked up.
+	obj.Header = obj.mergedHeaders(nil).sanitized()
+
+	if len(parsed.Recipients) == 0 {
+		obj.recipients = []recipientInfo{
+			recipientInfo{
+				header:       parsed.Header,
+				encryptedKey: parsed.EncryptedKey.bytes(),
+			},
+		}
+	} else {
+		obj.recipients = make([]recipientInfo, len(parsed.Recipients))
+		for r := range parsed.Recipients {
+			encryptedKey, err := base64URLDecode(parsed.Recipients[r].EncryptedKey)
+			if err != nil {
+				return nil, err
+			}
+
+			// Check that there is not a nonce in the unprotected header
+			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.Nonce != "" {
+				return nil, ErrUnprotectedNonce
+			}
+
+			obj.recipients[r].header = parsed.Recipients[r].Header
+			obj.recipients[r].encryptedKey = encryptedKey
+		}
+	}
+
+	for _, recipient := range obj.recipients {
+		headers := obj.mergedHeaders(&recipient)
+		if headers.Alg == "" || headers.Enc == "" {
+			return nil, fmt.Errorf("square/go-jose: message is missing alg/enc headers")
+		}
+	}
+
+	obj.iv = parsed.Iv.bytes()
+	obj.ciphertext = parsed.Ciphertext.bytes()
+	obj.tag = parsed.Tag.bytes()
+	obj.aad = parsed.Aad.bytes()
+
+	return obj, nil
+}
+
+// parseEncryptedCompact parses a message in compact format.
+func parseEncryptedCompact(input string) (*JsonWebEncryption, error) {
+	parts := strings.Split(input, ".")
+	if len(parts) != 5 {
+		return nil, fmt.Errorf("square/go-jose: compact JWE format must have five parts")
+	}
+
+	rawProtected, err := base64URLDecode(parts[0])
+	if err != nil {
+		return nil, err
+	}
+
+	encryptedKey, err := base64URLDecode(parts[1])
+	if err != nil {
+		return nil, err
+	}
+
+	iv, err := base64URLDecode(parts[2])
+	if err != nil {
+		return nil, err
+	}
+
+	ciphertext, err := base64URLDecode(parts[3])
+	if err != nil {
+		return nil, err
+	}
+
+	tag, err := base64URLDecode(parts[4])
+	if err != nil {
+		return nil, err
+	}
+
+	raw := &rawJsonWebEncryption{
+		Protected:    newBuffer(rawProtected),
+		EncryptedKey: newBuffer(encryptedKey),
+		Iv:           newBuffer(iv),
+		Ciphertext:   newBuffer(ciphertext),
+		Tag:          newBuffer(tag),
+	}
+
+	return raw.sanitized()
+}
+
+// CompactSerialize serializes an object using the compact serialization format.
+func (obj JsonWebEncryption) CompactSerialize() (string, error) {
+	if len(obj.recipients) != 1 || obj.unprotected != nil ||
+		obj.protected == nil || obj.recipients[0].header != nil {
+		return "", ErrNotSupported
+	}
+
+	serializedProtected := mustSerializeJSON(obj.protected)
+
+	return fmt.Sprintf(
+		"%s.%s.%s.%s.%s",
+		base64URLEncode(serializedProtected),
+		base64URLEncode(obj.recipients[0].encryptedKey),
+		base64URLEncode(obj.iv),
+		base64URLEncode(obj.ciphertext),
+		base64URLEncode(obj.tag)), nil
+}
+
+// FullSerialize serializes an object using the full JSON serialization format.
+func (obj JsonWebEncryption) FullSerialize() string {
+	raw := rawJsonWebEncryption{
+		Unprotected:  obj.unprotected,
+		Iv:           newBuffer(obj.iv),
+		Ciphertext:   newBuffer(obj.ciphertext),
+		EncryptedKey: newBuffer(obj.recipients[0].encryptedKey),
+		Tag:          newBuffer(obj.tag),
+		Aad:          newBuffer(obj.aad),
+		Recipients:   []rawRecipientInfo{},
+	}
+
+	if len(obj.recipients) > 1 {
+		for _, recipient := range obj.recipients {
+			info := rawRecipientInfo{
+				Header:       recipient.header,
+				EncryptedKey: base64URLEncode(recipient.encryptedKey),
+			}
+			raw.Recipients = append(raw.Recipients, info)
+		}
+	} else {
+		// Use flattened serialization
+		raw.Header = obj.recipients[0].header
+		raw.EncryptedKey = newBuffer(obj.recipients[0].encryptedKey)
+	}
+
+	if obj.protected != nil {
+		raw.Protected = newBuffer(mustSerializeJSON(obj.protected))
+	}
+
+	return string(mustSerializeJSON(raw))
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jwe_test.go

@@ -0,0 +1,537 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"math/big"
+	"testing"
+)
+
+func TestCompactParseJWE(t *testing.T) {
+	// Should parse
+	msg := "eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA.dGVzdA"
+	_, err := ParseEncrypted(msg)
+	if err != nil {
+		t.Error("Unable to parse valid message:", err)
+	}
+
+	// Messages that should fail to parse
+	failures := []string{
+		// Too many parts
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Not enough parts
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid encrypted key
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.//////.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid IV
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.//////.dGVzdA.dGVzdA",
+		// Invalid ciphertext
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.//////.dGVzdA",
+		// Invalid tag
+		"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.dGVzdA.dGVzdA.dGVzdA.//////",
+		// Invalid header
+		"W10.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Invalid header
+		"######.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+		// Missing alc/enc params
+		"e30.dGVzdA.dGVzdA.dGVzdA.dGVzdA",
+	}
+
+	for _, msg := range failures {
+		_, err = ParseEncrypted(msg)
+		if err == nil {
+			t.Error("Able to parse invalid message", msg)
+		}
+	}
+}
+
+func TestFullParseJWE(t *testing.T) {
+	// Messages that should succeed to parse
+	successes := []string{
+		// Flattened serialization, single recipient
+		"{\"protected\":\"eyJhbGciOiJYWVoiLCJlbmMiOiJYWVoifQo\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+		// Unflattened serialization, single recipient
+		"{\"protected\":\"\",\"unprotected\":{\"enc\":\"XYZ\"},\"recipients\":[{\"header\":{\"alg\":\"XYZ\"},\"encrypted_key\":\"QUJD\"}],\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+	}
+
+	for i := range successes {
+		_, err := ParseEncrypted(successes[i])
+		if err != nil {
+			t.Error("Unble to parse valid message", err, successes[i])
+		}
+	}
+
+	// Messages that should fail to parse
+	failures := []string{
+		// Empty
+		"{}",
+		// Invalid JSON
+		"{XX",
+		// Invalid protected header
+		"{\"protected\":\"###\"}",
+		// Invalid protected header
+		"{\"protected\":\"e1gK\"}",
+		// Invalid encrypted key
+		"{\"protected\":\"e30\",\"encrypted_key\":\"###\"}",
+		// Invalid IV
+		"{\"protected\":\"e30\",\"encrypted_key\":\"QUJD\",\"iv\":\"###\"}",
+		// Invalid ciphertext
+		"{\"protected\":\"e30\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"###\"}",
+		// Invalid tag
+		"{\"protected\":\"e30\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"###\"}",
+		// Invalid AAD
+		"{\"protected\":\"e30\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\",\"aad\":\"###\"}",
+		// Missing alg/enc headers
+		"{\"protected\":\"e30\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+		// Missing enc header
+		"{\"protected\":\"eyJhbGciOiJYWVoifQ\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+		// Missing alg header
+		"{\"protected\":\"eyJlbmMiOiJYWVoifQ\",\"encrypted_key\":\"QUJD\",\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+		// Unflattened serialization, single recipient, invalid encrypted_key
+		"{\"protected\":\"\",\"recipients\":[{\"header\":{\"alg\":\"XYZ\", \"enc\":\"XYZ\"},\"encrypted_key\":\"###\"}],\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+		// Unflattened serialization, single recipient, missing alg
+		"{\"protected\":\"eyJhbGciOiJYWVoifQ\",\"recipients\":[{\"encrypted_key\":\"QUJD\"}],\"iv\":\"QUJD\",\"ciphertext\":\"QUJD\",\"tag\":\"QUJD\"}",
+	}
+
+	for i := range failures {
+		_, err := ParseEncrypted(failures[i])
+		if err == nil {
+			t.Error("Able to parse invalid message", err, failures[i])
+		}
+	}
+}
+
+func TestMissingInvalidHeaders(t *testing.T) {
+	obj := &JsonWebEncryption{
+		protected:   &rawHeader{Enc: A128GCM},
+		unprotected: &rawHeader{},
+		recipients: []recipientInfo{
+			recipientInfo{},
+		},
+	}
+
+	_, err := obj.Decrypt(nil)
+	if err != ErrUnsupportedKeyType {
+		t.Error("should detect invalid key")
+	}
+
+	obj.unprotected.Crit = []string{"1", "2"}
+
+	_, err = obj.Decrypt(nil)
+	if err == nil {
+		t.Error("should reject message with crit header")
+	}
+
+	obj.unprotected.Crit = nil
+	obj.protected = &rawHeader{Alg: string(RSA1_5)}
+
+	_, err = obj.Decrypt(rsaTestKey)
+	if err == nil || err == ErrCryptoFailure {
+		t.Error("should detect missing enc header")
+	}
+}
+
+func TestRejectUnprotectedJWENonce(t *testing.T) {
+	// No need to test compact, since that's always protected
+
+	// Flattened JSON
+	input := `{
+	"header":  {
+		"alg": "XYZ", "enc": "XYZ",
+		"nonce": "should-cause-an-error"
+	},
+	"encrypted_key": "does-not-matter",
+	"aad": "does-not-matter",
+	"iv": "does-not-matter",
+	"ciphertext": "does-not-matter",
+	"tag": "does-not-matter"
+	}`
+	_, err := ParseEncrypted(input)
+	if err == nil {
+		t.Error("JWE with an unprotected nonce parsed as valid.")
+	} else if err.Error() != "square/go-jose: Nonce parameter included in unprotected header" {
+		t.Errorf("Improper error for unprotected nonce: %v", err)
+	}
+
+	input = `{
+		"unprotected":  {
+			"alg": "XYZ", "enc": "XYZ",
+			"nonce": "should-cause-an-error"
+		},
+		"encrypted_key": "does-not-matter",
+		"aad": "does-not-matter",
+		"iv": "does-not-matter",
+		"ciphertext": "does-not-matter",
+		"tag": "does-not-matter"
+	}`
+	_, err = ParseEncrypted(input)
+	if err == nil {
+		t.Error("JWE with an unprotected nonce parsed as valid.")
+	} else if err.Error() != "square/go-jose: Nonce parameter included in unprotected header" {
+		t.Errorf("Improper error for unprotected nonce: %v", err)
+	}
+
+	// Full JSON
+	input = `{
+		"header":  { "alg": "XYZ", "enc": "XYZ" },
+		"aad": "does-not-matter",
+		"iv": "does-not-matter",
+		"ciphertext": "does-not-matter",
+		"tag": "does-not-matter",
+		"recipients": [{
+			"header": { "nonce": "should-cause-an-error" },
+			"encrypted_key": "does-not-matter"
+		}]
+	}`
+	_, err = ParseEncrypted(input)
+	if err == nil {
+		t.Error("JWS with an unprotected nonce parsed as valid.")
+	} else if err.Error() != "square/go-jose: Nonce parameter included in unprotected header" {
+		t.Errorf("Improper error for unprotected nonce: %v", err)
+	}
+}
+
+func TestCompactSerialize(t *testing.T) {
+	// Compact serialization must fail if we have unprotected headers
+	obj := &JsonWebEncryption{
+		unprotected: &rawHeader{Alg: "XYZ"},
+	}
+
+	_, err := obj.CompactSerialize()
+	if err == nil {
+		t.Error("Object with unprotected headers can't be compact serialized")
+	}
+}
+
+func TestVectorsJWE(t *testing.T) {
+	plaintext := []byte("The true sign of intelligence is not knowledge but imagination.")
+
+	publicKey := &rsa.PublicKey{
+		N: fromBase64Int(`
+			oahUIoWw0K0usKNuOR6H4wkf4oBUXHTxRvgb48E-BVvxkeDNjbC4he8rUW
+			cJoZmds2h7M70imEVhRU5djINXtqllXI4DFqcI1DgjT9LewND8MW2Krf3S
+			psk_ZkoFnilakGygTwpZ3uesH-PFABNIUYpOiN15dsQRkgr0vEhxN92i2a
+			sbOenSZeyaxziK72UwxrrKoExv6kc5twXTq4h-QChLOln0_mtUZwfsRaMS
+			tPs6mS6XrgxnxbWhojf663tuEQueGC-FCMfra36C9knDFGzKsNa7LZK2dj
+			YgyD3JR_MB_4NUJW_TqOQtwHYbxevoJArm-L5StowjzGy-_bq6Gw`),
+		E: 65537,
+	}
+
+	expectedCompact := stripWhitespace(`
+		eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkEyNTZHQ00ifQ.ROQCfge4JPm_
+		yACxv1C1NSXmwNbL6kvmCuyxBRGpW57DvlwByjyjsb6g8m7wtLMqKEyhFCn
+		tV7sjippEePIlKln6BvVnz5ZLXHNYQgmubuNq8MC0KTwcaGJ_C0z_T8j4PZ
+		a1nfpbhSe-ePYaALrf_nIsSRKu7cWsrwOSlaRPecRnYeDd_ytAxEQWYEKFi
+		Pszc70fP9geZOB_09y9jq0vaOF0jGmpIAmgk71lCcUpSdrhNokTKo5y8MH8
+		3NcbIvmuZ51cjXQj1f0_AwM9RW3oCh2Hu0z0C5l4BujZVsDuGgMsGZsjUhS
+		RZsAQSXHCAmlJ2NlnN60U7y4SPJhKv5tKYw.48V1_ALb6US04U3b.5eym8T
+		W_c8SuK0ltJ3rpYIzOeDQz7TALvtu6UG9oMo4vpzs9tX_EFShS8iB7j6jiS
+		diwkIr3ajwQzaBtQD_A.XFBoMYUZodetZdvTiFvSkQ`)
+
+	expectedFull := stripWhitespace(`
+		{ "protected":"eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkEyNTZHQ00ifQ",
+		"encrypted_key":
+			"ROQCfge4JPm_yACxv1C1NSXmwNbL6kvmCuyxBRGpW57DvlwByjyjsb
+			 6g8m7wtLMqKEyhFCntV7sjippEePIlKln6BvVnz5ZLXHNYQgmubuNq
+			 8MC0KTwcaGJ_C0z_T8j4PZa1nfpbhSe-ePYaALrf_nIsSRKu7cWsrw
+			 OSlaRPecRnYeDd_ytAxEQWYEKFiPszc70fP9geZOB_09y9jq0vaOF0
+			 jGmpIAmgk71lCcUpSdrhNokTKo5y8MH83NcbIvmuZ51cjXQj1f0_Aw
+			 M9RW3oCh2Hu0z0C5l4BujZVsDuGgMsGZsjUhSRZsAQSXHCAmlJ2Nln
+			 N60U7y4SPJhKv5tKYw",
+		"iv": "48V1_ALb6US04U3b",
+		"ciphertext":
+			"5eym8TW_c8SuK0ltJ3rpYIzOeDQz7TALvtu6UG9oMo4vpzs9tX_EFS
+			 hS8iB7j6jiSdiwkIr3ajwQzaBtQD_A",
+		"tag":"XFBoMYUZodetZdvTiFvSkQ" }`)
+
+	// Mock random reader
+	randReader = bytes.NewReader([]byte{
+		// Encryption key
+		177, 161, 244, 128, 84, 143, 225, 115, 63, 180, 3, 255, 107, 154,
+		212, 246, 138, 7, 110, 91, 112, 46, 34, 105, 47, 130, 203, 46, 122,
+		234, 64, 252,
+		// Randomness for RSA-OAEP
+		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+		// Initialization vector
+		227, 197, 117, 252, 2, 219, 233, 68, 180, 225, 77, 219})
+	defer resetRandReader()
+
+	// Encrypt with a dummy key
+	encrypter, err := NewEncrypter(RSA_OAEP, A256GCM, publicKey)
+	if err != nil {
+		panic(err)
+	}
+
+	object, err := encrypter.Encrypt(plaintext)
+	if err != nil {
+		panic(err)
+	}
+
+	serialized, err := object.CompactSerialize()
+	if serialized != expectedCompact {
+		t.Error("Compact serialization is not what we expected", serialized, expectedCompact)
+	}
+
+	serialized = object.FullSerialize()
+	if serialized != expectedFull {
+		t.Error("Full serialization is not what we expected")
+	}
+}
+
+func TestVectorsJWECorrupt(t *testing.T) {
+	priv := &rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: fromHexInt(`
+				a8b3b284af8eb50b387034a860f146c4919f318763cd6c5598c8
+				ae4811a1e0abc4c7e0b082d693a5e7fced675cf4668512772c0c
+				bc64a742c6c630f533c8cc72f62ae833c40bf25842e984bb78bd
+				bf97c0107d55bdb662f5c4e0fab9845cb5148ef7392dd3aaff93
+				ae1e6b667bb3d4247616d4f5ba10d4cfd226de88d39f16fb`),
+			E: 65537,
+		},
+		D: fromHexInt(`
+				53339cfdb79fc8466a655c7316aca85c55fd8f6dd898fdaf1195
+				17ef4f52e8fd8e258df93fee180fa0e4ab29693cd83b152a553d
+				4ac4d1812b8b9fa5af0e7f55fe7304df41570926f3311f15c4d6
+				5a732c483116ee3d3d2d0af3549ad9bf7cbfb78ad884f84d5beb
+				04724dc7369b31def37d0cf539e9cfcdd3de653729ead5d1`),
+		Primes: []*big.Int{
+			fromHexInt(`
+				d32737e7267ffe1341b2d5c0d150a81b586fb3132bed2f8d5262
+				864a9cb9f30af38be448598d413a172efb802c21acf1c11c520c
+				2f26a471dcad212eac7ca39d`),
+			fromHexInt(`
+				cc8853d1d54da630fac004f471f281c7b8982d8224a490edbeb3
+				3d3e3d5cc93c4765703d1dd791642f1f116a0dd852be2419b2af
+				72bfe9a030e860b0288b5d77`),
+		},
+	}
+
+	corruptCiphertext := stripWhitespace(`
+		eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.NFl09dehy
+		IR2Oh5iSsvEa82Ps7DLjRHeo0RnuTuSR45OsaIP6U8yu7vLlWaZKSZMy
+		B2qRBSujf-5XIRoNhtyIyjk81eJRXGa_Bxaor1XBCMyyhGchW2H2P71f
+		PhDO6ufSC7kV4bNqgHR-4ziS7KXwzN83_5kogXqxUpymUoJDNc.tk-GT
+		W_VVhiTIKFF.D_BE6ImZUl9F.52a-zFnRb3YQwIC7UrhVyQ`)
+
+	corruptAuthtag := stripWhitespace(`
+		eyJhbGciOiJSU0EtT0FFUCIsImVuYyI6IkExMjhHQ00ifQ.NFl09dehy
+		IR2Oh5iSsvEa82Ps7DLjRHeo0RnuTuSR45OsaIP6U8yu7vLlWaZKSZMy
+		B2qRBSujf-5XIRoNhtyIyjk81eJRXGa_Bxaor1XBCMyyhGchW2H2P71f
+		PhDO6ufSC7kV4bNqgHR-4ziS7KNwzN83_5kogXqxUpymUoJDNc.tk-GT
+		W_VVhiTIKFF.D_BE6ImZUl9F.52a-zFnRb3YQwiC7UrhVyQ`)
+
+	msg, _ := ParseEncrypted(corruptCiphertext)
+	_, err := msg.Decrypt(priv)
+	if err != ErrCryptoFailure {
+		t.Error("should detect corrupt ciphertext")
+	}
+
+	msg, _ = ParseEncrypted(corruptAuthtag)
+	_, err = msg.Decrypt(priv)
+	if err != ErrCryptoFailure {
+		t.Error("should detect corrupt auth tag")
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestSampleNimbusJWEMessagesRSA(t *testing.T) {
+	rsaPrivateKey, err := LoadPrivateKey(fromBase64Bytes(`
+		MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCNRCEmf5PlbXKuT4uwnb
+		wGKvFrtpi+bDYxOZxxqxdVkZM/bYATAnD1fg9pNvLMKeF+MWJ9kPIMmDgOh9RdnRdLvQGb
+		BzhLmxwhhcua2QYiHEZizXmiaXvNP12bzEBhebdX7ObW8izMVW0p0lqHPNzkK3K75B0Sxo
+		FMVKkZ7KtBHgepBT5yPhPPcNe5lXQeTne5bo3I60DRcN9jTBgMJOXdq0I9o4y6ZmoXdNTm
+		0EyLzn9/EYiHqBxtKFh791EHR7wYgyi/t+nOKr4sO74NbEByP0mHDil+mPvZSzFW4l7fPx
+		OclRZvpRIKIub2TroZA9s2WsshGf79eqqXYbBB9NNRAgMBAAECggEAIExbZ/nzTplfhwsY
+		3SCzRJW87OuqsJ79JPQPGM4NX7sQ94eJqM7+FKLl0yCFErjgnYGdCyiArvB+oJPdsimgke
+		h83X0hGeg03lVA3/6OsG3WifCAxulnLN44AM8KST8S9D9t5+cm5vEBLHazzAfWWTS13s+g
+		9hH8rf8NSqgZ36EutjKlvLdHx1mWcKX7SREFVHT8FWPAbdhTLEHUjoWHrfSektnczaSHnt
+		q8fFJy6Ld13QkF1ZJRUhtA24XrD+qLTc+M36IuedjeZaLHFB+KyhYR3YvXEtrbCug7dCRd
+		uG6uTlDCSaSy7xHeTPolWtWo9F202jal54otxiAJFGUHgQKBgQDRAT0s6YQZUfwE0wluXV
+		k0JdhDdCo8sC1aMmKlRKWUkBAqrDl7BI3MF56VOr4ybr90buuscshFf9TtrtBOjHSGcfDI
+		tSKfhhkW5ewQKB0YqyHzoD6UKT0/XAshFY3esc3uCxuJ/6vOiXV0og9o7eFvr51O0TfDFh
+		mcTvW4wirKlQKBgQCtB7UAu8I9Nn8czkd6oXLDRyTWYviuiqFmxR+PM9klgZtsumkeSxO1
+		lkfFoj9+G8nFaqYEBA9sPeNtJVTSROCvj/iQtoqpV2NiI/wWeVszpBwsswx2mlks4LJa8a
+		Yz9xrsfNoroKYVppefc/MCoSx4M+99RSm3FSpLGZQHAUGyzQKBgQDMQmq4JuuMF1y2lk0E
+		SESyuz21BqV0tDVOjilsHT+5hmXWXoS6nkO6L2czrrpM7YE82F6JJZBmo7zEIXHBInGLJ3
+		XLoYLZ5qNEhqYDUEDHaBCBWZ1vDTKnZlwWFEuXVavNNZvPbUhKTHq25t8qjDki/r09Vykp
+		BsM2yNBKpbBOVQKBgCJyUVd3CaFUExQyAMrqD0XPCQdhJq7gzGcAQVsp8EXmOoH3zmuIeM
+		ECzQEMXuWFNLMHm0tbX5Kl83vMHcnKioyI9ewhWxOBYTitf0ceG8j5F97SOl32NmCXzwoJ
+		55Oa0xJXfLuIvOe8hZzp4WwZmBfKBxiCR166aPQQgIawelrVAoGAEJsHomfCI4epxH4oMw
+		qYJMCGy95zloB+2+c86BZCOJAGwnfzbtc2eutWZw61/9sSO8sQCfzA8oX+5HwAgnFVzwW4
+		lNMZohppYcpwN9EyjkPaCXuALC7p5rF2o63wY7JLvnjS2aYZliknh2yW6X6fSB0PK0Cpvd
+		lAIyRw6Kud0zI=`))
+	if err != nil {
+		panic(err)
+	}
+
+	rsaSampleMessages := []string{
+		"eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBMV81In0.EW0KOhHeoAxTBnLjYhh2T6HjwI-srNs6RpcSdZvE-GJ5iww3EYWBCmeGGj1UVz6OcBfwW3wllZ6GPOHU-hxVQH5KYpVOjkmrFIYU6-8BHhxBP_PjSJEBCZzjOgsCm9Th4-zmlO7UWTdK_UtwE7nk4X-kkmEy-aZBCShA8nFe2MVvqD5F7nvEWNFBOHh8ae_juo-kvycoIzvxLV9g1B0Zn8K9FAlu8YF1KiL5NFekn76f3jvAwlExuRbFPUx4gJN6CeBDK_D57ABsY2aBVDSiQceuYZxvCIAajqSS6dMT382FNJzAiQhToOpo_1w5FnnBjzJLLEKDk_I-Eo2YCWxxsQ.5mCMuxJqLRuPXGAr.Ghe4INeBhP3MDWGvyNko7qanKdZIzKjfeiU.ja3UlVWJXKNFJ-rZsJWycw",
+		"eyJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiUlNBMV81In0.JsJeYoP0St1bRYNUaAmA34DAA27usE7RNuC2grGikBRmh1xrwUOpnEIXXpwr7fjVmNi52zzWkNHC8JkkRTrLcCh2VXvnOnarpH8DCr9qM6440bSrahzbxIvDds8z8q0wT1W4kjVnq1mGwGxg8RQNBWTV6Sp2FLQkZyjzt_aXsgYzr3zEmLZxB-d41lBS81Mguk_hdFJIg_WO4ao54lozvxkCn_uMiIZ8eLb8qHy0h-N21tiHGCaiC2vV8KXomwoqbJ0SXrEH4r9_R2J844H80TBZdbvNBd8whvoQNHvOX659LNs9EQ9xxvHU2kqGZekXBu7sDXXTjctMkMITobGSzw.1v5govaDvanP3LGp.llwYNBDrD7MwVLaFHesljlratfmndWs4XPQ.ZGT1zk9_yIKi2GzW6CuAyA",
+		"eyJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiUlNBMV81In0.fBv3fA3TMS3ML8vlsCuvwdsKvB0ym8R30jJrlOiqkWKk7WVUkjDInFzr1zw3Owla6c5BqOJNoACXt4IWbkLbkoWV3tweXlWwpafuaWPkjLOUH_K31rS2fCX5x-MTj8_hScquVQXpbz3vk2EfulRmGXZc_8JU2NqQCAsYy3a28houqP3rDe5jEAvZS2SOFvJkKW--f5S-z39t1D7fNz1N8Btd9SmXWQzjbul5YNxI9ctqxhJpkKYpxOLlvrzdA6YdJjOlDx3n6S-HnSZGM6kQd_xKtAf8l1EGwhQmhbXhMhjVxMvGwE5BX7PAb8Ccde5bzOCJx-PVbVetuLb169ZYqQ._jiZbOPRR82FEWMZ.88j68LI-K2KT6FMBEdlz6amG5nvaJU8a-90.EnEbUTJsWNqJYKzfO0x4Yw",
+		"eyJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiUlNBMV81In0.bN6FN0qmGxhkESiVukrCaDVG3woL0xE-0bHN_Mu0WZXTQWbzzT-7jOvaN1xhGK8nzi8qpCSRgE5onONNB9i8OnJm3MMIxF7bUUEAXO9SUAFn2v--wNc4drPc5OjIu0RiJrDVDkkGjNrBDIuBaEQcke7A0v91PH58dXE7o4TLPzC8UJmRtXWhUSwjXVF3-UmYRMht2rjHJlvRbtm6Tu2LMBIopRL0zj6tlPP4Dm7I7sz9OEB3VahYAhpXnFR7D_f8RjLSXQmBvB1FiI5l_vMz2NFt2hYUmQF3EJMLIEdHvvPp3iHDGiXC1obJrDID_CCf3qs9UY7DMYL622KLvP2NIg.qb72oxECzxd_aNuHVR0aNg.Gwet9Ms8hB8rKEb0h4RGdFNRq97Qs2LQaJM0HWrCqoI.03ljVThOFvgXzMmQJ79VjQ",
+		"eyJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiUlNBMV81In0.ZbEOP6rqdiIP4g7Nl1PL5gwhgDwv9RinyiUQxZXPOmD7kwEZrZ093dJnhqI9kEd3QGFlHDpB7HgNz53d27z2zmEj1-27v6miizq6tH4sN2MoeZLwSyk16O1_n3bVdDmROawsTYYFJfHsuLwyVJxPd37duIYnbUCFO9J8lLIv-2VI50KJ1t47YfE4P-Wt9jVzxP2CVUQaJwTlcwfiDLJTagYmfyrDjf525WlQFlgfJGqsJKp8BX9gmKvAo-1iCBAM8VpEjS0u0_hW9VSye36yh8BthVV-VJkhJ-0tMpto3bbBmj7M25Xf4gbTrrVU7Nz6wb18YZuhHZWmj2Y2nHV6Jg.AjnS44blTrIIfFlqVw0_Mg.muCRgaEXNKKpW8rMfW7jf7Zpn3VwSYDz-JTRg16jZxY.qjc9OGlMaaWKDWQSIwVpR4K556Pp6SF9",
+		"eyJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiUlNBMV81In0.c7_F1lMlRHQQE3WbKmtHBYTosdZrG9hPfs-F9gNQYet61zKG8NXVkSy0Zf2UFHt0vhcO8hP2qrqOFsy7vmRj20xnGHQ2EE29HH6hwX5bx1Jj3uE5WT9Gvh0OewpvF9VubbwWTIObBpdEG7XdJsMAQlIxtXUmQYAtLTWcy2ZJipyJtVlWQLaPuE8BKfZH-XAsp2CpQNiRPI8Ftza3EAspiyRfVQbjKt7nF8nuZ2sESjt7Y50q4CSiiCuGT28T3diMN0_rWrH-I-xx7OQvJlrQaNGglGtu3jKUcrJDcvxW2e1OxriaTeuQ848ayuRvGUNeSv6WoVYmkiK1x_gNwUAAbw.7XtSqHJA7kjt6JrfxJMwiA.Yvi4qukAbdT-k-Fd2s4G8xzL4VFxaFC0ZIzgFDAI6n0.JSWPJ-HjOE3SK9Lm0yHclmjS7Z1ahtQga9FHGCWVRcc",
+		"eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBLU9BRVAifQ.SYVxJbCnJ_tcR13LJpaqHQj-nGNkMxre4A1FmnUdxnvzeJwuvyrLiUdRsZR1IkP4fqLtDON2mumx39QeJQf0WIObPBYlIxycRLkwxDHRVlyTmPvdZHAxN26jPrk09wa5SgK1UF1W1VSQIPm-Tek8jNAmarF1Yxzxl-t54wZFlQiHP4TuaczugO5f-J4nlWenfla2mU1snDgdUMlEZGOAQ_gTEtwSgd1MqXmK_7LZBkoDqqoCujMZhziafJPXPDaUUqBLW3hHkkDA7GpVec3XcTtNUWQJqOpMyQhqo1KQMc8jg3fuirILp-hjvvNVtBnCRBvbrKUCPzu2_yH3HM_agA.2VsdijtonAxShNIW.QzzB3P9CxYP3foNKN0Ma1Z9tMwijAlkWo08.ZdQkIPDY_M-hxqi5fD4NGw",
+		"eyJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiUlNBLU9BRVAifQ.Z2oTJXXib1u-S38Vn3DRKE3JnhnwgUa92UhsefzY2Wpdn0dmxMfYt9iRoJGFfSAcA97MOfjyvXVRCKWXGrG5AZCMAXEqU8SNQwKPRjlcqojcVzQyMucXI0ikLC4mUgeRlfKTwsBicq6JZZylzRoLGGSNJQbni3_BLsf7H3Qor0BYg0FPCLG9Z2OVvrFzvjTLmZtV6gFlVrMHBxJub_aUet9gAkxiu1Wx_Kx46TlLX2tkumXIpTGlzX6pef6jLeZ5EIg_K-Uz4tkWgWQIEkLD7qmTyk5pAGmzukHa_08jIh5-U-Sd8XGZdx4J1pVPJ5CPg0qDJGZ_cfgkgpWbP_wB6A.4qgKfokK1EwYxz20._Md82bv_KH2Vru0Ue2Eb6oAqHP2xBBP5jF8.WFRojvQpD5VmZlOr_dN0rQ",
+		"eyJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiUlNBLU9BRVAifQ.JzCUgJcBJmBgByp4PBAABUfhezPvndxBIVzaoZ96DAS0HPni0OjMbsOGsz6JwNsiTr1gSn_S6R1WpZM8GJc9R2z0EKKVP67TR62ZSG0MEWyLpHmG_4ug0fAp1HWWMa9bT4ApSaOLgwlpVAb_-BPZZgIu6c8cREuMon6UBHDqW1euTBbzk8zix3-FTZ6p5b_3soDL1wXfRiRBEsxxUGMnpryx1OFb8Od0JdyGF0GgfLt6OoaujDJpo-XtLRawu1Xlg6GqRs0NQwSHZ5jXgQ6-zgCufXonAmYTiIyBXY2no9XmECTexjwrS_05nA7H-UyIZEBOCp3Yhz2zxrt5j_0pvQ.SJR-ghhaUKP4zXtZ.muiuzLfZA0y0BDNsroGTw2r2-l73SLf9lK8.XFMH1oHr1G6ByP3dWSUUPA",
+		"eyJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiUlNBLU9BRVAifQ.U946MVfIm4Dpk_86HrnIA-QXyiUu0LZ67PL93CMLmEtJemMNDqmRd9fXyenCIhAC7jPIV1aaqW7gS194xyrrnUpBoJBdbegiPqOfquy493Iq_GQ8OXnFxFibPNQ6rU0l8BwIfh28ei_VIF2jqN6bhxFURCVW7fG6n6zkCCuEyc7IcxWafSHjH2FNttREuVj-jS-4LYDZsFzSKbpqoYF6mHt8H3btNEZDTSmy_6v0fV1foNtUKNfWopCp-iE4hNh4EzJfDuU8eXLhDb03aoOockrUiUCh-E0tQx9su4rOv-mDEOHHAQK7swm5etxoa7__9PC3Hg97_p4GM9gC9ykNgw.pnXwvoSPi0kMQP54of-HGg.RPJt1CMWs1nyotx1fOIfZ8760mYQ69HlyDp3XmdVsZ8.Yxw2iPVWaBROFE_FGbvodA",
+		"eyJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiUlNBLU9BRVAifQ.eKEOIJUJpXmO_ghH_nGCJmoEspqKyiy3D5l0P8lKutlo8AuYHPQlgOsaFYnDkypyUVWd9zi-JaQuCeo7dzoBiS1L71nAZo-SUoN0anQBkVuyuRjr-deJMhPPfq1H86tTk-4rKzPr1Ivd2RGXMtWsrUpNGk81r1v8DdMntLE7UxZQqT34ONuZg1IXnD_U6di7k07unI29zuU1ySeUr6w1YPw5aUDErMlpZcEJWrgOEYWaS2nuC8sWGlPGYEjqkACMFGn-y40UoS_JatNZO6gHK3SKZnXD7vN5NAaMo_mFNbh50e1t_zO8DaUdLtXPOBLcx_ULoteNd9H8HyDGWqwAPw.0xmtzJfeVMoIT1Cp68QrXA.841l1aA4c3uvSYfw6l180gn5JZQjL53WQ5fr8ejtvoI.lojzeWql_3gDq-AoaIbl_aGQRH_54w_f",
+		"eyJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiUlNBLU9BRVAifQ.D0QkvIXR1TL7dIHWuPNMybmmD8UPyQd1bRKjRDNbA2HmKGpamCtcJmpNB_EetNFe-LDmhe44BYI_XN2wIBbYURKgDK_WG9BH0LQw_nCVqQ-sKqjtj3yQeytXhLHYTDmiF0TO-uW-RFR7GbPAdARBfuf4zj82r_wDD9sD5WSCGx89iPfozDOYQ_OLwdL2WD99VvDyfwS3ZhxA-9IMSYv5pwqPkxj4C0JdjCqrN0YNrZn_1ORgjtsVmcWXsmusObTozUGA7n5GeVepfZdU1vrMulAwdRYqOYtlqKaOpFowe9xFN3ncBG7wb4f9pmzbS_Dgt-1_Ii_4SEB9GQ4NiuBZ0w.N4AZeCxMGUv52A0UVJsaZw.5eHOGbZdtahnp3l_PDY-YojYib4ft4SRmdsQ2kggrTs.WsmGH8ZDv4ctBFs7qsQvw2obe4dVToRcAQaZ3PYL34E",
+		"eyJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.fDTxO_ZzZ3Jdrdw-bxvg7u-xWB2q1tp3kI5zH6JfhLUm4h6rt9qDA_wZlRym8-GzEtkUjkTtQGs6HgQx_qlyy8ylCakY5GHsNhCG4m0UNhRiNfcasAs03JSXfON9-tfTJimWD9n4k5OHHhvcrsCW1G3jYeLsK9WHCGRIhNz5ULbo8HBrCTbmZ6bOEQ9mqhdssLpdV24HDpebotf3bgPJqoaTfWU6Uy7tLmPiNuuNRLQ-iTpLyNMTVvGqqZhpcV3lAEN5l77QabI5xLJYucvYjrXQhAEZ7YXO8oRYhGkdG2XXIRcwr87rBeRH-47HAyhZgF_PBPBhhrJNS9UNMqdfBw.FvU4_s7Md6vxnXWd.fw29Q4_gHt4f026DPPV-CNebQ8plJ6IVLX8._apBZrw7WsT8HOmxgCrTwA",
+		"eyJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.bYuorK-rHMbO4c2CRWtvyOEaM1EN-o-wLRZ0wFWRX9mCXQ-iTNarZn7ksYM1XnGmZ4u3CSowX1Hpca9Rg72_VJCmKapqCT7r3YfasN4_oeLwuSKI_gT-uVOznod97tn3Gf_EDv0y1V4H0k9BEIFGbajAcG1znTD_ODY3j2KZJxisfrsBoslc6N-HI0kKZMC2hSGuHOcOf8HN1sTE-BLqZCtoj-zxQECJK8Wh14Ih4jzzdmmiu_qmSR780K6su-4PRt3j8uY7oCiLBfwpCsCmhJgp8rKd91zoedZmamfvX38mJIfE52j4fG6HmIYw9Ov814fk9OffV6tzixjcg54Q2g.yeVJz4aSh2s-GUr9.TBzzWP5llEiDdugpP2SmPf2U4MEGG9EoPWk.g25UoWpsBaOd45J__FX7mA",
+		"eyJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.h9tFtmh762JuffBxlSQbJujCyI4Zs9yc3IOb1yR8g65W4ZHosIvzVGHWbShj4EY9MNrz-RbKtHfqQGGzDeo3Xb4-HcQ2ZDHyWoUg7VfA8JafJ5zIKL1npz8eUExOVMLsAaRfHg8qNfczodg3egoSmX5Q-nrx4DeidDSXYZaZjV0C72stLTPcuQ7XPV7z1tvERAkqpvcsRmJn_PiRNxIbAgoyHMJ4Gijuzt1bWZwezlxYmw0TEuwCTVC2fl9NJTZyxOntS1Lcm-WQGlPkVYeVgYTOQXLlp7tF9t-aAvYpth2oWGT6Y-hbPrjx_19WaKD0XyWCR46V32DlXEVDP3Xl2A.NUgfnzQyEaJjzt9r.k2To43B2YVWMeR-w3n4Pr2b5wYq2o87giHk.X8_QYCg0IGnn1pJqe8p_KA",
+		"eyJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.EDq6cNP6Yp1sds5HZ4CkXYp7bs9plIYVZScKvuyxUy0H1VyBC_YWg0HvndPNb-vwh1LA6KMxRazlOwJ9iPR9YzHnYmGgPM3Je_ZzBfiPlRfq6hQBpGnNaypBI1XZ2tyFBhulsVLqyJe2SmM2Ud00kasOdMYgcN8FNFzq7IOE7E0FUQkIwLdUL1nrzepiYDp-5bGkxWRcL02cYfdqdm00G4m0GkUxAmdxa3oPNxZlt2NeBI_UVWQSgJE-DJVJQkDcyA0id27TV2RCDnmujYauNT_wYlyb0bFDx3pYzzNXfAXd4wHZxt75QaLZ5APJ0EVfiXJ0qki6kT-GRVmOimUbQA.vTULZL7LvS0WD8kR8ZUtLg.mb2f0StEmmkuuvsyz8UplMvF58FtZzlu8eEwzvPUvN0.hbhveEN40V-pgG2hSVgyKg",
+		"eyJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.DuYk92p7u-YIN-JKn-XThmlVcnhU9x5TieQ2uhsLQVNlo0iWC9JJPP6bT6aI6u_1BIS3yE8_tSGGL7eM-zyEk6LuTqSWFRaZcZC06d0MnS9eYZcw1T2D17fL-ki-NtCaTahJD7jE2s0HevRVW49YtL-_V8whnO_EyVjvXIAQlPYqhH_o-0Nzcpng9ggdAnuF2rY1_6iRPYFJ3BLQvG1oWhyJ9s6SBttlOa0i6mmFCVLHx6sRpdGAB3lbCL3wfmHq4tpIv77gfoYUNP0SNff-zNmBXF_wp3dCntLZFTjbfMpGyHlruF_uoaLqwdjYpUGNUFVUoeSiMnSbMKm9NxiDgQ.6Mdgcqz7bMU1UeoAwFC8pg.W36QWOlBaJezakUX5FMZzbAgeAu_R14AYKZCQmuhguw.5OeyIJ03olxmJft8uBmjuOFQPWNZMYLI",
+		"eyJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiUlNBLU9BRVAtMjU2In0.ECulJArWFsPL2FlpCN0W8E7IseSjJg1cZqE3wz5jk9gvwgNForAUEv5KYZqhNI-p5IxkGV0f8K6Y2X8pWzbLwiPIjZe8_dVqHYJoINxqCSgWLBhz0V36qL9Nc_xARTBk4-ZteIu75NoXVeos9gNvFnkOCj4tm-jGo8z8EFO9XfODgjhiR4xv8VqUtvrkjo9GQConaga5zpV-J4JQlXbdqbDjnuwacnJAxYpFyuemqcgqsl6BnFX3tovGkmSUPqcvF1A6tiHqr-TEmcgVqo5C3xswknRBKTQRM00iAmJ92WlVdkoOCx6E6O7cVHFawZ14BLzWzm66Crb4tv0ucYvk_Q.mxolwUaoj5S5kHCfph0w8g.nFpgYdnYg3blHCCEi2XXQGkkKQBXs2OkZaH11m3PRvk.k8BAVT4EcyrUFVIKr-KOSPbF89xyL0Vri2rFTu2iIWM",
+	}
+
+	for _, msg := range rsaSampleMessages {
+		obj, err := ParseEncrypted(msg)
+		if err != nil {
+			t.Error("unable to parse message", msg, err)
+			continue
+		}
+		plaintext, err := obj.Decrypt(rsaPrivateKey)
+		if err != nil {
+			t.Error("unable to decrypt message", msg, err)
+			continue
+		}
+		if string(plaintext) != "Lorem ipsum dolor sit amet" {
+			t.Error("plaintext is not what we expected for msg", msg)
+		}
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestSampleNimbusJWEMessagesAESKW(t *testing.T) {
+	aesTestKeys := [][]byte{
+		fromHexBytes("DF1FA4F36FFA7FC42C81D4B3C033928D"),
+		fromHexBytes("DF1FA4F36FFA7FC42C81D4B3C033928D95EC9CDC2D82233C"),
+		fromHexBytes("DF1FA4F36FFA7FC42C81D4B3C033928D95EC9CDC2D82233C333C35BA29044E90"),
+	}
+
+	aesSampleMessages := [][]string{
+		[]string{
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwidGFnIjoib2ZMd2Q5NGloVWFRckJ0T1pQUDdjUSIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoiV2Z3TnN5cjEwWUFjY2p2diJ9.9x3RxdqIS6P9xjh93Eu1bQ.6fs3_fSGt2jull_5.YDlzr6sWACkFg_GU5MEc-ZEWxNLwI_JMKe_jFA.f-pq-V7rlSSg_q2e1gDygw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwidGFnIjoic2RneXB1ckFjTEFzTmZJU0lkZUNpUSIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoieVFMR0dCdDJFZ0c1THdyViJ9.arslKo4aKlh6f4s0z1_-U-8JbmhAoZHN.Xw2Q-GX98YXwuc4i.halTEWMWAYZbv-qOD52G6bte4x6sxlh1_VpGEA.Z1spn016v58cW6Q2o0Qxag",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwidGFnIjoicTNzejF5VUlhbVBDYXJfZ05kSVJqQSIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoiM0ZRM0FsLWJWdWhmcEIyQyJ9.dhVipWbzIdsINttuZM4hnjpHvwEHf0VsVrOp4GAg01g.dk7dUyt1Qj13Pipw.5Tt70ONATF0BZAS8dBkYmCV7AQUrfb8qmKNLmw.A6ton9MQjZg0b3C0QcW-hg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwidGFnIjoiUHNpTGphZnJZNE16UlRmNlBPLTZfdyIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoiSUFPbnd2ODR5YXFEaUxtbSJ9.swf92_LyCvjsvkynHTuMNXRl_MX2keU-fMDWIMezHG4.LOp9SVIXzs4yTnOtMyXZYQ.HUlXrzqJ1qXYl3vUA-ydezCg77WvJNtKdmZ3FPABoZw.8UYl1LOofQLAxHHvWqoTbg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwidGFnIjoiWGRndHQ5dUVEMVlVeU1rVHl6M3lqZyIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoiWF90V2RhSmh6X3J1SHJvQSJ9.JQ3dS1JSgzIFi5M9ig63FoFU1nHBTmPwXY_ovNE2m1JOSUvHtalmihIuraPDloCf.e920JVryUIWt7zJJQM-www.8DUrl4LmsxIEhRr9RLTHG9tBTOcwXqEbQHAJd_qMHzE.wHinoqGUhL4O7lx125kponpwNtlp8VGJ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwidGFnIjoicGgyaTdoY0FWNlh3ZkQta1RHYlVXdyIsImFsZyI6IkExMjhHQ01LVyIsIml2IjoiaG41Smk4Wm1rUmRrSUxWVSJ9._bQlJXl22dhsBgYPhkxUyinBNi871teGWbviOueWj2PqG9OPxIc9SDS8a27YLSVDMircd5Q1Df28--vcXIABQA.DssmhrAg6w_f2VDaPpxTbQ.OGclEmqrxwvZqAfn7EgXlIfXgr0wiGvEbZz3zADnqJs.YZeP0uKVEiDl8VyC-s20YN-RbdyGNsbdtoGDP3eMof8",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiQTEyOEtXIn0.TEMcXEoY8WyqGjYs5GZgS-M_Niwu6wDY.i-26KtTt51Td6Iwd.wvhkagvPsLj3QxhPBbfH_th8OqxisUtme2UadQ.vlfvBPv3bw2Zk2H60JVNLQ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiQTEyOEtXIn0.gPaR6mgQ9TUx05V6DRfgTQeZxl0ZSzBa5uQd-qw6yLs.MojplOD77FkMooS-.2yuD7dKR_C3sFbhgwiBccKKOF8DrSvNiwX7wPQ.qDKUbSvMnJv0qifjpWC14g",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiQTEyOEtXIn0.Fg-dgSkUW1KEaL5YDPoWHNL8fpX1WxWVLA9OOWsjIFhQVDKyUZI7BQ.mjRBpyJTZf7H-quf.YlNHezMadtaSKp23G-ozmYhHOeHwuJnvWGTtGg.YagnR7awBItUlMDo4uklvg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiQTEyOEtXIn0.x1vYzUE-E2XBWva9OPuwtqfQaf9rlJCIBAyAe6N2q2kWfJrkxGxFsQ.gAwe78dyODFaoP2IOityAA.Yh5YfovkWxGBNAs1sVhvXow_2izHHsBiYEc9JYD6kVg.mio1p3ncp2wLEaEaRa7P0w",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiQTEyOEtXIn0.szGrdnmF7D5put2aRBvSSFfp0vRgkRGYaafijJIqAF6PWd1IxsysZRV8aQkQOW1cB6d0fXsTfYM.Ru25LVOOk4xhaK-cIZ0ThA.pF9Ok5zot7elVqXFW5YYHV8MuF9gVGzpQnG1XDs_g_w.-7la0uwcNPpteev185pMHZjbVDXlrec8",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiQTEyOEtXIn0.cz-hRv0xR5CnOcnoRWNK8Q9poyVYzRCVTjfmEXQN6xPOZUkJ3zKNqb8Pir_FS0o2TVvxmIbuxeISeATTR2Ttx_YGCNgMkc93.SF5rEQT94lZR-UORcMKqGw.xphygoU7zE0ZggOczXCi_ytt-Evln8CL-7WLDlWcUHg.5h99r8xCCwP2PgDbZqzCJ13oFfB2vZWetD5qZjmmVho",
+		},
+		[]string{
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwidGFnIjoiVWR5WUVKdEJ5ZTA5dzdjclY0cXI1QSIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoiZlBBV0QwUmdSbHlFdktQcCJ9.P1uTfTuH-imL-NJJMpuTRA.22yqZ1NIfx3KNPgc.hORWZaTSgni1FS-JT90vJly-cU37qTn-tWSqTg.gMN0ufXF92rSXupTtBNkhA",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwidGFnIjoiOU9qX3B2LTJSNW5lZl9YbWVkUWltUSIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoiY3BybGEwYUYzREVQNmFJTSJ9.6NVpAm_APiC7km2v-oNR8g23K9U_kf1-.jIg-p8tNwSvwxch0.1i-GPaxS4qR6Gy4tzeVtSdRFRSKQSMpmn-VhzA.qhFWPqtA6vVPl7OM3DThsA",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwidGFnIjoiOVc3THg3MVhGQVJCb3NaLVZ5dXc4ZyIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoiZ1N4ZE5heFdBSVBRR0tHYiJ9.3YjPz6dVQwAtCekvtXiHZrooOUlmCsMSvyfwmGwdrOA.hA_C0IDJmGaRzsB0.W4l7OPqpFxiVOZTGfAlRktquyRTo4cEOk9KurQ.l4bGxOkO_ql_jlPo3Oz3TQ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwidGFnIjoiOHJYbWl2WXFWZjNfbHhhd2NUbHJoUSIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoiVXBWeXprVTNKcjEwYXRqYyJ9.8qft-Q_xqUbo5j_aVrVNHchooeLttR4Kb6j01O8k98M.hXO-5IKBYCL9UdwBFVm0tg.EBM4lCZX_K6tfqYmfoDxVPHcf6cT--AegXTTjfSqsIw.Of8xUvEQSh3xgFT3uENnAg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwidGFnIjoiVnItSnVaX0tqV2hSWWMzdzFwZ3cwdyIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoiRGg2R3dISVBVS3ljZGNZeCJ9.YSEDjCnGWr_n9H94AvLoRnwm6bdU9w6-Q67k-QQRVcKRd6673pgH9zEF9A9Dt6o1.gcmVN4kxqBuMq6c7GrK3UQ.vWzJb0He6OY1lhYYjYS7CLh55REAAq1O7yNN-ND4R5Q.OD0B6nwyFaDr_92ysDOtlVnJaeoIqhGw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwidGFnIjoieEtad1BGYURpQ3NqUnBqZUprZHhmZyIsImFsZyI6IkExOTJHQ01LVyIsIml2IjoieTVHRFdteXdkb2R1SDJlYyJ9.AW0gbhWqlptOQ1y9aoNVwrTIIkBfrp33C2OWJsbrDRk6lhxg_IgFhMDTE37moReySGUtttC4CXQD_7etHmd3Hw.OvKXK-aRKlXHOpJQ9ZY_YQ.Ngv7WarDDvR2uBj_DavPAR3DYuIaygvSSdcHrc8-ZqM.MJ6ElitzFCKf_0h5fIJw8uOLC6ps7dKZPozF8juQmUY",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiQTE5MktXIn0.8qu63pppcSvp1vv37WrZ44qcCTg7dQMA.cDp-f8dJTrDEpZW4.H6OBJYs4UvFR_IZHLYQZxB6u9a0wOdAif2LNfQ.1dB-id0UIwRSlmwHx5BJCg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiQTE5MktXIn0._FdoKQvC8qUs7K0upriEihUwztK8gOwonXpOxdIwrfs.UO38ok8gDdpLVa1T.x1GvHdVCy4fxoQRg-OQK4Ez3jDOvu9gllLPeEA.3dLeZGIprh_nHizOTVi1xw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiQTE5MktXIn0.uzCJskgSIK6VkjJIu-dQi18biqaY0INc_A1Ehx0oESafgtR99_n4IA.W2eKK8Y14WwTowI_.J2cJC7R6Bz6maR0s1UBMPyRi5BebNUAmof4pvw.-7w6htAlc4iUsOJ6I04rFg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiQTE5MktXIn0.gImQeQETp_6dfJypFDPLlv7c5pCzuq86U16gzrLiCXth6X9XfxJpvQ.YlC4MxjtLWrsyEvlFhvsqw.Vlpvmg9F3gkz4e1xG01Yl2RXx-jG99rF5UvCxOBXSLc.RZUrU_FoR5bG3M-j3GY0Dw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiQTE5MktXIn0.T2EfQ6Tu2wJyRMgZzfvBYmQNCCfdMudMrg86ibEMVAOUKJPtR3WMPEb_Syy9p2VjrLKRlv7nebo.GPc8VbarPPRtzIRATB8NsA.ugPCqLvVLwh55bWlwjsFkmWzJ31z5z-wuih2oJqmG_U.m7FY3EjvV6mKosEYJ5cY7ezFoVQoJS8X",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiQTE5MktXIn0.OgLMhZ-2ZhslQyHfzOfyC-qmT6bNg9AdpP59B4jtyxWkQu3eW475WCdiAjojjeyBtVRGQ5vOomwaOIFejY_IekzH6I_taii3.U9x44MF6Wyz5TIwIzwhoxQ.vK7yvSF2beKdNxNY_7n4XdF7JluCGZoxdFJyTJVkSmI.bXRlI8KL-g7gpprQxGmXjVYjYghhWJq7mlCfWI8q2uA",
+		},
+		[]string{
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwidGFnIjoiR3BjX3pfbjduZjJVZlEtWGdsaTBaQSIsImFsZyI6IkEyNTZHQ01LVyIsIml2IjoiUk40eUdhOVlvYlFhUmZ1TCJ9.Q4ukD6_hZpmASAVcqWJ9Wg.Zfhny_1WNdlp4fH-.3sekDCjkExQCcv28ZW4yrcFnz0vma3vgoenSXA.g8_Ird2Y0itTCDP61du-Yg",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwidGFnIjoiWC05UkNVWVh4U3NRelcwelVJS01VUSIsImFsZyI6IkEyNTZHQ01LVyIsIml2IjoiY3JNMnJfa3RrdWpyQ1h5OSJ9.c0q2jCxxV4y1h9u_Xvn7FqUDnbkmNEG4.S_noOTZKuUo9z1l6.ez0RdA25vXMUGH96iXmj3DEVox0J7TasJMnzgg.RbuSPTte_NzTtEEokbc5Ig",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwidGFnIjoiWmwyaDFpUW11QWZWd2lJeVp5RHloZyIsImFsZyI6IkEyNTZHQ01LVyIsIml2Ijoib19xZmljb0N0NzNzRWo1QyJ9.NpJxRJ0aqcpekD6HU2u9e6_pL_11JXjWvjfeQnAKkZU.4c5qBcBBrMWi27Lf.NKwNIb4b6cRDJ1TwMKsPrjs7ADn6aNoBdQClVw.yNWmSSRBqQfIQObzj8zDqw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwidGFnIjoiMXdwVEI3LWhjdzZUVXhCbVh2UzdhUSIsImFsZyI6IkEyNTZHQ01LVyIsIml2IjoiOUdIVnZJaDZ0a09vX2pHUSJ9.MFgIhp9mzlq9hoPqqKVKHJ3HL79EBYtV4iNhD63yqiU.UzW5iq8ou21VpZYJgKEN8A.1gOEzA4uAPvHP76GMfs9uLloAV10mKaxiZVAeL7iQA0.i1X_2i0bCAz-soXF9bI_zw",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwidGFnIjoiNThocUtsSk15Y1BFUEFRUlNfSzlNUSIsImFsZyI6IkEyNTZHQ01LVyIsIml2IjoiUDh3aTBWMTluVnZqNXpkOSJ9.FXidOWHNFJODO74Thq3J2cC-Z2B8UZkn7SikeosU0bUK6Jx_lzzmUZ-Lafadpdpj.iLfcDbpuBKFiSfiBzUQc7Q.VZK-aD7BFspqfvbwa0wE2wwWxdomzk2IKMetFe8bI44.7wC6rJRGa4x48xbYMd6NH9VzK8uNn4Cb",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwidGFnIjoicGcwOEpUcXdzMXdEaXBaRUlpVExoQSIsImFsZyI6IkEyNTZHQ01LVyIsIml2IjoiSlpodk9CdU1RUDFFZTZTNSJ9.wqVgTPm6TcYCTkpbwmn9sW4mgJROH2A3dIdSXo5oKIQUIVbQsmy7KXH8UYO2RS9slMGtb869C8o0My67GKg9dQ.ogrRiLlqjB1S5j-7a05OwA.2Y_LyqhU4S_RXMsB74bxcBacd23J2Sp5Lblw-sOkaUY.XGMiYoU-f3GaEzSvG41vpJP2DMGbeDFoWmkUGLUjc4M",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4R0NNIiwiYWxnIjoiQTI1NktXIn0.QiIZm9NYfahqYFIbiaoUhCCHjotHMkup.EsU0XLn4FjzzCILn.WuCoQkm9vzo95E7hxBtfYpt-Mooc_vmSTyzj6Q.NbeeYVy6gQPlmhoWDrZwaQ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyR0NNIiwiYWxnIjoiQTI1NktXIn0.1ol3j_Lt0Os3UMe2Gypj0o8b77k0FSmqD7kNRNoMa9U.vZ2HMTgN2dgUd42h.JvNcy8-c8sYzOC089VtFSg2BOQx3YF8CqSTuJw.t03LRioWWKN3d7SjinU6SQ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2R0NNIiwiYWxnIjoiQTI1NktXIn0.gbkk03l1gyrE9qGEMVtORiyyUqKsgzbqjLd8lw0RQ07WWn--TV4BgA.J8ThH4ac2UhSsMIP.g-W1piEGrdi3tNwQDJXpYm3fQjTf82mtVCrCOg.-vY05P4kiB9FgF2vwrSeXQ",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiYWxnIjoiQTI1NktXIn0.k86pQs7gmQIzuIWRFwesF32XY2xi1WbYxi7XUf_CYlOlehwGCTINHg.3NcC9VzfQgsECISKf4xy-g.v2amdo-rgeGsg-II_tvPukX9D-KAP27xxf2uQJ277Ws.E4LIE3fte3glAnPpnd8D9Q",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMTkyQ0JDLUhTMzg0IiwiYWxnIjoiQTI1NktXIn0.b8iN0Am3fCUvj7sBd7Z0lpfzBjh1MOgojV7J5rDfrcTU3b35RGYgEV1RdcrtUTBgUwITDjmU7jM.wsSDBFghDga_ERv36I2AOg.6uJsucCb2YReFOJGBdo4zidTIKLUmZBIXfm_M0AJpKk.YwdAfXI3HHcw2wLSnfCRtw4huZQtSKhz",
+			"eyJ6aXAiOiJERUYiLCJlbmMiOiJBMjU2Q0JDLUhTNTEyIiwiYWxnIjoiQTI1NktXIn0.akY9pHCbkHPh5VpXIrX0At41XnJIKBR9iMMkf301vKeJNAZYJTxWzeJhFd-DhQ47tMctc3YYkwZkQ5I_9fGYb_f0oBcw4esh.JNwuuHud78h6S99NO1oBQQ.0RwckPYATBgvw67upkAQ1AezETHc-gh3rryz19i5ryc.3XClRTScgzfMgLCHxHHoRF8mm9VVGXv_Ahtx65PskKQ",
+		},
+	}
+
+	for i, msgs := range aesSampleMessages {
+		for _, msg := range msgs {
+			obj, err := ParseEncrypted(msg)
+			if err != nil {
+				t.Error("unable to parse message", msg, err)
+				continue
+			}
+			plaintext, err := obj.Decrypt(aesTestKeys[i])
+			if err != nil {
+				t.Error("unable to decrypt message", msg, err)
+				continue
+			}
+			if string(plaintext) != "Lorem ipsum dolor sit amet" {
+				t.Error("plaintext is not what we expected for msg", msg)
+			}
+		}
+	}
+}
+
+// Test vectors generated with jose4j
+func TestSampleJose4jJWEMessagesECDH(t *testing.T) {
+	ecTestKey := &ecdsa.PrivateKey{
+		PublicKey: ecdsa.PublicKey{
+			Curve: elliptic.P256(),
+			X:     fromBase64Int("weNJy2HscCSM6AEDTDg04biOvhFhyyWvOHQfeF_PxMQ"),
+			Y:     fromBase64Int("e8lnCO-AlStT-NJVX-crhB7QRYhiix03illJOVAOyck"),
+		},
+		D: fromBase64Int("VEmDZpDXXK8p8N0Cndsxs924q6nS1RXFASRl6BfUqdw"),
+	}
+
+	ecSampleMessages := []string{
+		"eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTEyOENCQy1IUzI1NiIsImVwayI6eyJrdHkiOiJFQyIsIngiOiJTQzAtRnJHUkVvVkpKSmg1TGhORmZqZnFXMC1XSUFyd3RZMzJzQmFQVVh3IiwieSI6ImFQMWlPRENveU9laTVyS1l2VENMNlRMZFN5UEdUN0djMnFsRnBwNXdiWFEiLCJjcnYiOiJQLTI1NiJ9fQ..3mifklTnTTGuA_etSUBBCw.dj8KFM8OlrQ3rT35nHcHZ7A5p84VB2OZb054ghSjS-M.KOIgnJjz87LGqMtikXGxXw",
+		"eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTE5MkNCQy1IUzM4NCIsImVwayI6eyJrdHkiOiJFQyIsIngiOiJUaHRGc0lRZ1E5MkZOYWFMbUFDQURLbE93dmNGVlRORHc4ampfWlJidUxjIiwieSI6IjJmRDZ3UXc3YmpYTm1nVThXMGpFbnl5ZUZkX3Y4ZmpDa3l1R29vTFhGM0EiLCJjcnYiOiJQLTI1NiJ9fQ..90zFayMkKc-fQC_19f6P3A.P1Y_7lMnfkUQOXW_en31lKZ3zAn1nEYn6fXLjmyVPrQ.hrgwy1cePVfhMWT0h-crKTXldglHZ-4g",
+		"eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkNCQy1IUzUxMiIsImVwayI6eyJrdHkiOiJFQyIsIngiOiI5R1Z6c3VKNWgySl96UURVUFR3WU5zUkFzVzZfY2RzN0pELVQ2RDREQ1ZVIiwieSI6InFZVGl1dVU4aTB1WFpoaS14VGlRNlZJQm5vanFoWENPVnpmWm1pR2lRTEUiLCJjcnYiOiJQLTI1NiJ9fQ..v2reRlDkIsw3eWEsTCc1NA.0qakrFdbhtBCTSl7EREf9sxgHBP9I-Xw29OTJYnrqP8.54ozViEBYYmRkcKp7d2Ztt4hzjQ9Vb5zCeijN_RQrcI",
+		"eyJhbGciOiJFQ0RILUVTK0EyNTZLVyIsImVuYyI6IkExMjhDQkMtSFMyNTYiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiOElUemg3VVFaaUthTWtfME9qX1hFaHZENXpUWjE2Ti13WVdjeTJYUC1tdyIsInkiOiJPNUJiVEk0bUFpU005ZmpCejBRU3pXaU5vbnl3cWlQLUN0RGgwdnNGYXNRIiwiY3J2IjoiUC0yNTYifX0.D3DP3wqPvJv4TYYfhnfrOG6nsM-MMH_CqGfnOGjgdXHNF7xRwEJBOA.WL9Kz3gNYA7S5Rs5mKcXmA.EmQkXhO_nFqAwxJWaM0DH4s3pmCscZovB8YWJ3Ru4N8.Bf88uzwfxiyTjpejU5B0Ng",
+		"eyJhbGciOiJFQ0RILUVTK0EyNTZLVyIsImVuYyI6IkExOTJDQkMtSFMzODQiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiMjlJMk4zRkF0UlBlNGhzYjRLWlhTbmVyV0wyTVhtSUN1LXJJaXhNSHpJQSIsInkiOiJvMjY1bzFReEdmbDhzMHQ0U1JROS00RGNpc3otbXh4NlJ6WVF4SktyeWpJIiwiY3J2IjoiUC0yNTYifX0.DRmsmXz6fCnLc_njDIKdpM7Oc4jTqd_yd9J94TOUksAstEUkAl9Ie3Wg-Ji_LzbdX2xRLXIimcw.FwJOHPQhnqKJCfxt1_qRnQ.ssx3q1ZYILsMTln5q-K8HVn93BVPI5ViusstKMxZzRs.zzcfzWNYSdNDdQ4CiHfymj0bePaAbVaT",
+		"eyJhbGciOiJFQ0RILUVTK0EyNTZLVyIsImVuYyI6IkEyNTZDQkMtSFM1MTIiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiRUp6bTViQnRzVXJNYTl2Y1Q2d1hZRXI3ZjNMcjB0N1V4SDZuZzdGcFF0VSIsInkiOiJRYTNDSDllVTFXYjItdFdVSDN3Sk9fTDVMZXRsRUlMQWNkNE9XR2tFd0hZIiwiY3J2IjoiUC0yNTYifX0.5WxwluZpVWAOJdVrsnDIlEc4_wfRE1gXOaQyx_rKkElNz157Ykf-JsAD7aEvXfx--NKF4js5zYyjeCtxWBhRWPOoNNZJlqV_.Iuo82-qsP2S1SgQQklAnrw.H4wB6XoLKOKWCu6Y3LPAEuHkvyvr-xAh4IBm53uRF8g._fOLKq0bqDZ8KNjni_MJ4olHNaYz376dV9eNmp9O9PU",
+		"eyJhbGciOiJFQ0RILUVTK0ExOTJLVyIsImVuYyI6IkExMjhDQkMtSFMyNTYiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiZktNSG5sRkoxajBTSnJ3WGtVWlpaX3BtWHdUQlJtcHhlaTkxdUpaczUycyIsInkiOiJLRkxKaXhEUTJQcjEybWp1aFdYb3pna2U1V3lhWnhmTWlxZkJ0OEJpbkRvIiwiY3J2IjoiUC0yNTYifX0.2LSD2Mw4tyYJyfsmpVmzBtJRd12jMEYGdlhFbaXIbKi5A33CGNQ1tg.s40aAjmZOvK8Us86FCBdHg.jpYSMAKp___oMCoWM495mTfbi_YC80ObeoCmGE3H_gs.A6V-jJJRY1yz24CaXGUbzg",
+		"eyJhbGciOiJFQ0RILUVTK0ExOTJLVyIsImVuYyI6IkExOTJDQkMtSFMzODQiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiSDRxcFUzeWtuRktWRnV4SmxLa3NZSE5ieHF3aXM0WWtCVVFHVE1Td05JQSIsInkiOiJHb0lpRUZaUGRRSHJCbVR4ZTA3akJoZmxrdWNqUjVoX1QwNWVXc3Zib0prIiwiY3J2IjoiUC0yNTYifX0.KTrwwV2uzD--gf3PGG-kjEAGgi7u0eMqZPZfa4kpyFGm3x8t2m1NHdz3t9rfiqjuaqsxPKhF4gs.cu16fEOzYaSxhHu_Ht9w4g.BRJdxVBI9spVtY5KQ6gTR4CNcKvmLUMKZap0AO-RF2I.DZyUaa2p6YCIaYtjWOjC9GN_VIYgySlZ",
+		"eyJhbGciOiJFQ0RILUVTK0ExOTJLVyIsImVuYyI6IkEyNTZDQkMtSFM1MTIiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoieDBYSGRkSGM2Q0ktSnlfbUVMOEZZRExhWnV0UkVFczR4c3BMQmcwZk1jbyIsInkiOiJEa0xzOUJGTlBkTTVTNkpLYVJ3cnV1TWMwcUFzWW9yNW9fZWp6NXBNVXFrIiwiY3J2IjoiUC0yNTYifX0.mfCxJ7JYIqTMqcAh5Vp2USF0eF7OhOeluqda7YagOUJNwxA9wC9o23DSoLUylfrZUfanZrJJJcG69awlv-LY7anOLHlp3Ht5.ec48A_JWb4qa_PVHWZaTfQ.kDAjIDb3LzJpfxNh-DiAmAuaKMYaOGSTb0rkiJLuVeY.oxGCpPlii4pr89XMk4b9s084LucTqPGU6TLbOW2MZoc",
+		"eyJhbGciOiJFQ0RILUVTK0ExMjhLVyIsImVuYyI6IkExMjhDQkMtSFMyNTYiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiQXB5TnlqU2d0bmRUcFg0eENYenNDRnZva1l3X18weXg2dGRUYzdPUUhIMCIsInkiOiJYUHdHMDVDaW1vOGlhWmxZbDNsMEp3ZllhY1FZWHFuM2RRZEJUWFpldDZBIiwiY3J2IjoiUC0yNTYifX0.yTA2PwK9IPqkaGPenZ9R-gOn9m9rvcSEfuX_Nm8AkuwHIYLzzYeAEA.ZW1F1iyHYKfo-YoanNaIVg.PouKQD94DlPA5lbpfGJXY-EJhidC7l4vSayVN2vVzvA.MexquqtGaXKUvX7WBmD4bA",
+		"eyJhbGciOiJFQ0RILUVTK0ExMjhLVyIsImVuYyI6IkExOTJDQkMtSFMzODQiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiaDRWeGNzNVUzWk1fTlp4WmJxQ3hMTVB5UmEtR2ktSVNZa0xDTzE1RHJkZyIsInkiOiJFeVotS3dWNVE5OXlnWk5zU0lpSldpR3hqbXNLUk1WVE5sTTNSd1VYTFRvIiwiY3J2IjoiUC0yNTYifX0.wo56VISyL1QAbi2HLuVut5NGF2FvxKt7B8zHzJ3FpmavPozfbVZV08-GSYQ6jLQWJ4xsO80I4Kg.3_9Bo5ozvD96WHGhqp_tfQ.48UkJ6jk6WK70QItb2QZr0edKH7O-aMuVahTEeqyfW4.ulMlY2tbC341ct20YSmNdtc84FRz1I4g",
+		"eyJhbGciOiJFQ0RILUVTK0ExMjhLVyIsImVuYyI6IkEyNTZDQkMtSFM1MTIiLCJlcGsiOnsia3R5IjoiRUMiLCJ4IjoiN0xZRzZZWTJkel9ZaGNvNnRCcG1IX0tPREQ2X2hwX05tajdEc1c2RXgxcyIsInkiOiI5Y2lPeDcwUkdGT0tpVnBRX0NHQXB5NVlyeThDazBmUkpwNHVrQ2tjNmQ0IiwiY3J2IjoiUC0yNTYifX0.bWwW3J80k46HG1fQAZxUroko2OO8OKkeRavr_o3AnhJDMvp78OR229x-fZUaBm4uWv27_Yjm0X9T2H2lhlIli2Rl9v1PNC77.1NmsJBDGI1fDjRzyc4mtyA.9KfCFynQj7LmJq08qxAG4c-6ZPz1Lh3h3nUbgVwB0TI.cqech0d8XHzWfkWqgKZq1SlAfmO0PUwOsNVkuByVGWk",
+	}
+
+	for _, msg := range ecSampleMessages {
+		obj, err := ParseEncrypted(msg)
+		if err != nil {
+			t.Error("unable to parse message", msg, err)
+			continue
+		}
+		plaintext, err := obj.Decrypt(ecTestKey)
+		if err != nil {
+			t.Error("unable to decrypt message", msg, err)
+			continue
+		}
+		if string(plaintext) != "Lorem ipsum dolor sit amet." {
+			t.Error("plaintext is not what we expected for msg", msg)
+		}
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jwk.go

@@ -0,0 +1,380 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"fmt"
+	"math/big"
+	"reflect"
+	"strings"
+)
+
+// rawJsonWebKey represents a public or private key in JWK format, used for parsing/serializing.
+type rawJsonWebKey struct {
+	Use string      `json:"use,omitempty"`
+	Kty string      `json:"kty,omitempty"`
+	Kid string      `json:"kid,omitempty"`
+	Crv string      `json:"crv,omitempty"`
+	Alg string      `json:"alg,omitempty"`
+	K   *byteBuffer `json:"k,omitempty"`
+	X   *byteBuffer `json:"x,omitempty"`
+	Y   *byteBuffer `json:"y,omitempty"`
+	N   *byteBuffer `json:"n,omitempty"`
+	E   *byteBuffer `json:"e,omitempty"`
+	// -- Following fields are only used for private keys --
+	// RSA uses D, P and Q, while ECDSA uses only D. Fields Dp, Dq, and Qi are
+	// completely optional. Therefore for RSA/ECDSA, D != nil is a contract that
+	// we have a private key whereas D == nil means we have only a public key.
+	D  *byteBuffer `json:"d,omitempty"`
+	P  *byteBuffer `json:"p,omitempty"`
+	Q  *byteBuffer `json:"q,omitempty"`
+	Dp *byteBuffer `json:"dp,omitempty"`
+	Dq *byteBuffer `json:"dq,omitempty"`
+	Qi *byteBuffer `json:"qi,omitempty"`
+}
+
+// JsonWebKey represents a public or private key in JWK format.
+type JsonWebKey struct {
+	Key       interface{}
+	KeyID     string
+	Algorithm string
+	Use       string
+}
+
+// MarshalJSON serializes the given key to its JSON representation.
+func (k JsonWebKey) MarshalJSON() ([]byte, error) {
+	var raw *rawJsonWebKey
+	var err error
+
+	switch key := k.Key.(type) {
+	case *ecdsa.PublicKey:
+		raw, err = fromEcPublicKey(key)
+	case *rsa.PublicKey:
+		raw = fromRsaPublicKey(key)
+	case *ecdsa.PrivateKey:
+		raw, err = fromEcPrivateKey(key)
+	case *rsa.PrivateKey:
+		raw, err = fromRsaPrivateKey(key)
+	case []byte:
+		raw, err = fromSymmetricKey(key)
+	default:
+		return nil, fmt.Errorf("square/go-jose: unknown key type '%s'", reflect.TypeOf(key))
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	raw.Kid = k.KeyID
+	raw.Alg = k.Algorithm
+	raw.Use = k.Use
+
+	return MarshalJSON(raw)
+}
+
+// UnmarshalJSON reads a key from its JSON representation.
+func (k *JsonWebKey) UnmarshalJSON(data []byte) (err error) {
+	var raw rawJsonWebKey
+	err = UnmarshalJSON(data, &raw)
+	if err != nil {
+		return err
+	}
+
+	var key interface{}
+	switch raw.Kty {
+	case "EC":
+		if raw.D != nil {
+			key, err = raw.ecPrivateKey()
+		} else {
+			key, err = raw.ecPublicKey()
+		}
+	case "RSA":
+		if raw.D != nil {
+			key, err = raw.rsaPrivateKey()
+		} else {
+			key, err = raw.rsaPublicKey()
+		}
+	case "oct":
+		key, err = raw.symmetricKey()
+	default:
+		err = fmt.Errorf("square/go-jose: unkown json web key type '%s'", raw.Kty)
+	}
+
+	if err == nil {
+		*k = JsonWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use}
+	}
+	return
+}
+
+// JsonWebKeySet represents a JWK Set object.
+type JsonWebKeySet struct {
+	Keys []JsonWebKey `json:"keys"`
+}
+
+// Key convenience method returns keys by key ID. Specification states
+// that a JWK Set "SHOULD" use distinct key IDs, but allows for some
+// cases where they are not distinct. Hence method returns a slice
+// of JsonWebKeys.
+func (s *JsonWebKeySet) Key(kid string) []JsonWebKey {
+	var keys []JsonWebKey
+	for _, key := range s.Keys {
+		if key.KeyID == kid {
+			keys = append(keys, key)
+		}
+	}
+
+	return keys
+}
+
+const rsaThumbprintTemplate = `{"e":"%s","kty":"RSA","n":"%s"}`
+const ecThumbprintTemplate = `{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`
+
+func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
+	coordLength := curveSize(curve)
+	crv, err := curveName(curve)
+	if err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf(ecThumbprintTemplate, crv,
+		newFixedSizeBuffer(x.Bytes(), coordLength).base64(),
+		newFixedSizeBuffer(y.Bytes(), coordLength).base64()), nil
+}
+
+func rsaThumbprintInput(n *big.Int, e int) (string, error) {
+	return fmt.Sprintf(rsaThumbprintTemplate,
+		newBufferFromInt(uint64(e)).base64(),
+		newBuffer(n.Bytes()).base64()), nil
+}
+
+// Thumbprint computes the JWK Thumbprint of a key using the
+// indicated hash algorithm.
+func (k *JsonWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
+	var input string
+	var err error
+	switch key := k.Key.(type) {
+	case *ecdsa.PublicKey:
+		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
+	case *ecdsa.PrivateKey:
+		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
+	case *rsa.PublicKey:
+		input, err = rsaThumbprintInput(key.N, key.E)
+	case *rsa.PrivateKey:
+		input, err = rsaThumbprintInput(key.N, key.E)
+	default:
+		return nil, fmt.Errorf("square/go-jose: unkown key type '%s'", reflect.TypeOf(key))
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	h := hash.New()
+	h.Write([]byte(input))
+	return h.Sum(nil), nil
+}
+
+func (key rawJsonWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
+	if key.N == nil || key.E == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid RSA key, missing n/e values")
+	}
+
+	return &rsa.PublicKey{
+		N: key.N.bigInt(),
+		E: key.E.toInt(),
+	}, nil
+}
+
+func fromRsaPublicKey(pub *rsa.PublicKey) *rawJsonWebKey {
+	return &rawJsonWebKey{
+		Kty: "RSA",
+		N:   newBuffer(pub.N.Bytes()),
+		E:   newBufferFromInt(uint64(pub.E)),
+	}
+}
+
+func (key rawJsonWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
+	var curve elliptic.Curve
+	switch key.Crv {
+	case "P-256":
+		curve = elliptic.P256()
+	case "P-384":
+		curve = elliptic.P384()
+	case "P-521":
+		curve = elliptic.P521()
+	default:
+		return nil, fmt.Errorf("square/go-jose: unsupported elliptic curve '%s'", key.Crv)
+	}
+
+	if key.X == nil || key.Y == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid EC key, missing x/y values")
+	}
+
+	return &ecdsa.PublicKey{
+		Curve: curve,
+		X:     key.X.bigInt(),
+		Y:     key.Y.bigInt(),
+	}, nil
+}
+
+func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJsonWebKey, error) {
+	if pub == nil || pub.X == nil || pub.Y == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid EC key (nil, or X/Y missing)")
+	}
+
+	name, err := curveName(pub.Curve)
+	if err != nil {
+		return nil, err
+	}
+
+	size := curveSize(pub.Curve)
+
+	xBytes := pub.X.Bytes()
+	yBytes := pub.Y.Bytes()
+
+	if len(xBytes) > size || len(yBytes) > size {
+		return nil, fmt.Errorf("square/go-jose: invalid EC key (X/Y too large)")
+	}
+
+	key := &rawJsonWebKey{
+		Kty: "EC",
+		Crv: name,
+		X:   newFixedSizeBuffer(xBytes, size),
+		Y:   newFixedSizeBuffer(yBytes, size),
+	}
+
+	return key, nil
+}
+
+func (key rawJsonWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
+	var missing []string
+	switch {
+	case key.N == nil:
+		missing = append(missing, "N")
+	case key.E == nil:
+		missing = append(missing, "E")
+	case key.D == nil:
+		missing = append(missing, "D")
+	case key.P == nil:
+		missing = append(missing, "P")
+	case key.Q == nil:
+		missing = append(missing, "Q")
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("square/go-jose: invalid RSA private key, missing %s value(s)", strings.Join(missing, ", "))
+	}
+
+	rv := &rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: key.N.bigInt(),
+			E: key.E.toInt(),
+		},
+		D: key.D.bigInt(),
+		Primes: []*big.Int{
+			key.P.bigInt(),
+			key.Q.bigInt(),
+		},
+	}
+
+	if key.Dp != nil {
+		rv.Precomputed.Dp = key.Dp.bigInt()
+	}
+	if key.Dq != nil {
+		rv.Precomputed.Dq = key.Dq.bigInt()
+	}
+	if key.Qi != nil {
+		rv.Precomputed.Qinv = key.Qi.bigInt()
+	}
+
+	err := rv.Validate()
+	return rv, err
+}
+
+func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJsonWebKey, error) {
+	if len(rsa.Primes) != 2 {
+		return nil, ErrUnsupportedKeyType
+	}
+
+	raw := fromRsaPublicKey(&rsa.PublicKey)
+
+	raw.D = newBuffer(rsa.D.Bytes())
+	raw.P = newBuffer(rsa.Primes[0].Bytes())
+	raw.Q = newBuffer(rsa.Primes[1].Bytes())
+
+	return raw, nil
+}
+
+func (key rawJsonWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
+	var curve elliptic.Curve
+	switch key.Crv {
+	case "P-256":
+		curve = elliptic.P256()
+	case "P-384":
+		curve = elliptic.P384()
+	case "P-521":
+		curve = elliptic.P521()
+	default:
+		return nil, fmt.Errorf("square/go-jose: unsupported elliptic curve '%s'", key.Crv)
+	}
+
+	if key.X == nil || key.Y == nil || key.D == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid EC private key, missing x/y/d values")
+	}
+
+	return &ecdsa.PrivateKey{
+		PublicKey: ecdsa.PublicKey{
+			Curve: curve,
+			X:     key.X.bigInt(),
+			Y:     key.Y.bigInt(),
+		},
+		D: key.D.bigInt(),
+	}, nil
+}
+
+func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJsonWebKey, error) {
+	raw, err := fromEcPublicKey(&ec.PublicKey)
+	if err != nil {
+		return nil, err
+	}
+
+	if ec.D == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid EC private key")
+	}
+
+	raw.D = newBuffer(ec.D.Bytes())
+
+	return raw, nil
+}
+
+func fromSymmetricKey(key []byte) (*rawJsonWebKey, error) {
+	return &rawJsonWebKey{
+		Kty: "oct",
+		K:   newBuffer(key),
+	}, nil
+}
+
+func (key rawJsonWebKey) symmetricKey() ([]byte, error) {
+	if key.K == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid OCT (symmetric) key, missing k value")
+	}
+	return key.K.bytes(), nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jwk_test.go

@@ -0,0 +1,525 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"reflect"
+	"testing"
+)
+
+func TestCurveSize(t *testing.T) {
+	size256 := curveSize(elliptic.P256())
+	size384 := curveSize(elliptic.P384())
+	size521 := curveSize(elliptic.P521())
+	if size256 != 32 {
+		t.Error("P-256 have 32 bytes")
+	}
+	if size384 != 48 {
+		t.Error("P-384 have 48 bytes")
+	}
+	if size521 != 66 {
+		t.Error("P-521 have 66 bytes")
+	}
+}
+
+func TestRoundtripRsaPrivate(t *testing.T) {
+	jwk, err := fromRsaPrivateKey(rsaTestKey)
+	if err != nil {
+		t.Error("problem constructing JWK from rsa key", err)
+	}
+
+	rsa2, err := jwk.rsaPrivateKey()
+	if err != nil {
+		t.Error("problem converting RSA private -> JWK", err)
+	}
+
+	if rsa2.N.Cmp(rsaTestKey.N) != 0 {
+		t.Error("RSA private N mismatch")
+	}
+	if rsa2.E != rsaTestKey.E {
+		t.Error("RSA private E mismatch")
+	}
+	if rsa2.D.Cmp(rsaTestKey.D) != 0 {
+		t.Error("RSA private D mismatch")
+	}
+	if len(rsa2.Primes) != 2 {
+		t.Error("RSA private roundtrip expected two primes")
+	}
+	if rsa2.Primes[0].Cmp(rsaTestKey.Primes[0]) != 0 {
+		t.Error("RSA private P mismatch")
+	}
+	if rsa2.Primes[1].Cmp(rsaTestKey.Primes[1]) != 0 {
+		t.Error("RSA private Q mismatch")
+	}
+}
+
+func TestRsaPrivateInsufficientPrimes(t *testing.T) {
+	brokenRsaPrivateKey := rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: rsaTestKey.N,
+			E: rsaTestKey.E,
+		},
+		D:      rsaTestKey.D,
+		Primes: []*big.Int{rsaTestKey.Primes[0]},
+	}
+
+	_, err := fromRsaPrivateKey(&brokenRsaPrivateKey)
+	if err != ErrUnsupportedKeyType {
+		t.Error("expected unsupported key type error, got", err)
+	}
+}
+
+func TestRsaPrivateExcessPrimes(t *testing.T) {
+	brokenRsaPrivateKey := rsa.PrivateKey{
+		PublicKey: rsa.PublicKey{
+			N: rsaTestKey.N,
+			E: rsaTestKey.E,
+		},
+		D: rsaTestKey.D,
+		Primes: []*big.Int{
+			rsaTestKey.Primes[0],
+			rsaTestKey.Primes[1],
+			big.NewInt(3),
+		},
+	}
+
+	_, err := fromRsaPrivateKey(&brokenRsaPrivateKey)
+	if err != ErrUnsupportedKeyType {
+		t.Error("expected unsupported key type error, got", err)
+	}
+}
+
+func TestRoundtripEcPublic(t *testing.T) {
+	for i, ecTestKey := range []*ecdsa.PrivateKey{ecTestKey256, ecTestKey384, ecTestKey521} {
+		jwk, err := fromEcPublicKey(&ecTestKey.PublicKey)
+
+		ec2, err := jwk.ecPublicKey()
+		if err != nil {
+			t.Error("problem converting ECDSA private -> JWK", i, err)
+		}
+
+		if !reflect.DeepEqual(ec2.Curve, ecTestKey.Curve) {
+			t.Error("ECDSA private curve mismatch", i)
+		}
+		if ec2.X.Cmp(ecTestKey.X) != 0 {
+			t.Error("ECDSA X mismatch", i)
+		}
+		if ec2.Y.Cmp(ecTestKey.Y) != 0 {
+			t.Error("ECDSA Y mismatch", i)
+		}
+	}
+}
+
+func TestRoundtripEcPrivate(t *testing.T) {
+	for i, ecTestKey := range []*ecdsa.PrivateKey{ecTestKey256, ecTestKey384, ecTestKey521} {
+		jwk, err := fromEcPrivateKey(ecTestKey)
+
+		ec2, err := jwk.ecPrivateKey()
+		if err != nil {
+			t.Error("problem converting ECDSA private -> JWK", i, err)
+		}
+
+		if !reflect.DeepEqual(ec2.Curve, ecTestKey.Curve) {
+			t.Error("ECDSA private curve mismatch", i)
+		}
+		if ec2.X.Cmp(ecTestKey.X) != 0 {
+			t.Error("ECDSA X mismatch", i)
+		}
+		if ec2.Y.Cmp(ecTestKey.Y) != 0 {
+			t.Error("ECDSA Y mismatch", i)
+		}
+		if ec2.D.Cmp(ecTestKey.D) != 0 {
+			t.Error("ECDSA D mismatch", i)
+		}
+	}
+}
+
+func TestMarshalUnmarshal(t *testing.T) {
+	kid := "DEADBEEF"
+
+	for i, key := range []interface{}{ecTestKey256, ecTestKey384, ecTestKey521, rsaTestKey} {
+		for _, use := range []string{"", "sig", "enc"} {
+			jwk := JsonWebKey{Key: key, KeyID: kid, Algorithm: "foo"}
+			if use != "" {
+				jwk.Use = use
+			}
+
+			jsonbar, err := jwk.MarshalJSON()
+			if err != nil {
+				t.Error("problem marshaling", i, err)
+			}
+
+			var jwk2 JsonWebKey
+			err = jwk2.UnmarshalJSON(jsonbar)
+			if err != nil {
+				t.Error("problem unmarshalling", i, err)
+			}
+
+			jsonbar2, err := jwk2.MarshalJSON()
+			if err != nil {
+				t.Error("problem marshaling", i, err)
+			}
+
+			if !bytes.Equal(jsonbar, jsonbar2) {
+				t.Error("roundtrip should not lose information", i)
+			}
+			if jwk2.KeyID != kid {
+				t.Error("kid did not roundtrip JSON marshalling", i)
+			}
+
+			if jwk2.Algorithm != "foo" {
+				t.Error("alg did not roundtrip JSON marshalling", i)
+			}
+
+			if jwk2.Use != use {
+				t.Error("use did not roundtrip JSON marshalling", i)
+			}
+		}
+	}
+}
+
+func TestMarshalNonPointer(t *testing.T) {
+	type EmbedsKey struct {
+		Key JsonWebKey
+	}
+
+	keyJson := []byte(`{
+		"e": "AQAB",
+		"kty": "RSA",
+		"n": "vd7rZIoTLEe-z1_8G1FcXSw9CQFEJgV4g9V277sER7yx5Qjz_Pkf2YVth6wwwFJEmzc0hoKY-MMYFNwBE4hQHw"
+	}`)
+	var parsedKey JsonWebKey
+	err := UnmarshalJSON(keyJson, &parsedKey)
+	if err != nil {
+		t.Error(fmt.Sprintf("Error unmarshalling key: %v", err))
+		return
+	}
+	ek := EmbedsKey{
+		Key: parsedKey,
+	}
+	out, err := MarshalJSON(ek)
+	if err != nil {
+		t.Error(fmt.Sprintf("Error marshalling JSON: %v", err))
+		return
+	}
+	expected := "{\"Key\":{\"kty\":\"RSA\",\"n\":\"vd7rZIoTLEe-z1_8G1FcXSw9CQFEJgV4g9V277sER7yx5Qjz_Pkf2YVth6wwwFJEmzc0hoKY-MMYFNwBE4hQHw\",\"e\":\"AQAB\"}}"
+	if string(out) != expected {
+		t.Error("Failed to marshal embedded non-pointer JWK properly:", string(out))
+	}
+}
+
+func TestMarshalUnmarshalInvalid(t *testing.T) {
+	// Make an invalid curve coordinate by creating a byte array that is one
+	// byte too large, and setting the first byte to 1 (otherwise it's just zero).
+	invalidCoord := make([]byte, curveSize(ecTestKey256.Curve)+1)
+	invalidCoord[0] = 1
+
+	keys := []interface{}{
+		// Empty keys
+		&rsa.PrivateKey{},
+		&ecdsa.PrivateKey{},
+		// Invalid keys
+		&ecdsa.PrivateKey{
+			PublicKey: ecdsa.PublicKey{
+				// Missing values in pub key
+				Curve: elliptic.P256(),
+			},
+		},
+		&ecdsa.PrivateKey{
+			PublicKey: ecdsa.PublicKey{
+				// Invalid curve
+				Curve: nil,
+				X:     ecTestKey256.X,
+				Y:     ecTestKey256.Y,
+			},
+		},
+		&ecdsa.PrivateKey{
+			// Valid pub key, but missing priv key values
+			PublicKey: ecTestKey256.PublicKey,
+		},
+		&ecdsa.PrivateKey{
+			// Invalid pub key, values too large
+			PublicKey: ecdsa.PublicKey{
+				Curve: ecTestKey256.Curve,
+				X:     big.NewInt(0).SetBytes(invalidCoord),
+				Y:     big.NewInt(0).SetBytes(invalidCoord),
+			},
+			D: ecTestKey256.D,
+		},
+		nil,
+	}
+
+	for i, key := range keys {
+		jwk := JsonWebKey{Key: key}
+		_, err := jwk.MarshalJSON()
+		if err == nil {
+			t.Error("managed to serialize invalid key", i)
+		}
+	}
+}
+
+func TestWebKeyVectorsInvalid(t *testing.T) {
+	keys := []string{
+		// Invalid JSON
+		"{X",
+		// Empty key
+		"{}",
+		// Invalid RSA keys
+		`{"kty":"RSA"}`,
+		`{"kty":"RSA","e":""}`,
+		`{"kty":"RSA","e":"XXXX"}`,
+		`{"kty":"RSA","d":"XXXX"}`,
+		// Invalid EC keys
+		`{"kty":"EC","crv":"ABC"}`,
+		`{"kty":"EC","crv":"P-256"}`,
+		`{"kty":"EC","crv":"P-256","d":"XXX"}`,
+		`{"kty":"EC","crv":"ABC","d":"dGVzdA","x":"dGVzdA"}`,
+		`{"kty":"EC","crv":"P-256","d":"dGVzdA","x":"dGVzdA"}`,
+	}
+
+	for _, key := range keys {
+		var jwk2 JsonWebKey
+		err := jwk2.UnmarshalJSON([]byte(key))
+		if err == nil {
+			t.Error("managed to parse invalid key:", key)
+		}
+	}
+}
+
+// Test vectors from RFC 7520
+var cookbookJWKs = []string{
+	// EC Public
+	stripWhitespace(`{
+     "kty": "EC",
+     "kid": "bilbo.baggins@hobbiton.example",
+     "use": "sig",
+     "crv": "P-521",
+     "x": "AHKZLLOsCOzz5cY97ewNUajB957y-C-U88c3v13nmGZx6sYl_oJXu9
+         A5RkTKqjqvjyekWF-7ytDyRXYgCF5cj0Kt",
+     "y": "AdymlHvOiLxXkEhayXQnNCvDX4h9htZaCJN34kfmC6pV5OhQHiraVy
+         SsUdaQkAgDPrwQrJmbnX9cwlGfP-HqHZR1"
+   }`),
+
+	// EC Private
+	stripWhitespace(`{
+     "kty": "EC",
+     "kid": "bilbo.baggins@hobbiton.example",
+     "use": "sig",
+     "crv": "P-521",
+     "x": "AHKZLLOsCOzz5cY97ewNUajB957y-C-U88c3v13nmGZx6sYl_oJXu9
+           A5RkTKqjqvjyekWF-7ytDyRXYgCF5cj0Kt",
+     "y": "AdymlHvOiLxXkEhayXQnNCvDX4h9htZaCJN34kfmC6pV5OhQHiraVy
+           SsUdaQkAgDPrwQrJmbnX9cwlGfP-HqHZR1",
+     "d": "AAhRON2r9cqXX1hg-RoI6R1tX5p2rUAYdmpHZoC1XNM56KtscrX6zb
+           KipQrCW9CGZH3T4ubpnoTKLDYJ_fF3_rJt"
+   }`),
+
+	// RSA Public
+	stripWhitespace(`{
+     "kty": "RSA",
+     "kid": "bilbo.baggins@hobbiton.example",
+     "use": "sig",
+     "n": "n4EPtAOCc9AlkeQHPzHStgAbgs7bTZLwUBZdR8_KuKPEHLd4rHVTeT
+         -O-XV2jRojdNhxJWTDvNd7nqQ0VEiZQHz_AJmSCpMaJMRBSFKrKb2wqV
+         wGU_NsYOYL-QtiWN2lbzcEe6XC0dApr5ydQLrHqkHHig3RBordaZ6Aj-
+         oBHqFEHYpPe7Tpe-OfVfHd1E6cS6M1FZcD1NNLYD5lFHpPI9bTwJlsde
+         3uhGqC0ZCuEHg8lhzwOHrtIQbS0FVbb9k3-tVTU4fg_3L_vniUFAKwuC
+         LqKnS2BYwdq_mzSnbLY7h_qixoR7jig3__kRhuaxwUkRz5iaiQkqgc5g
+         HdrNP5zw",
+     "e": "AQAB"
+   }`),
+
+	// RSA Private
+	stripWhitespace(`{"kty":"RSA",
+      "kid":"juliet@capulet.lit",
+      "use":"enc",
+      "n":"t6Q8PWSi1dkJj9hTP8hNYFlvadM7DflW9mWepOJhJ66w7nyoK1gPNqFMSQRy
+           O125Gp-TEkodhWr0iujjHVx7BcV0llS4w5ACGgPrcAd6ZcSR0-Iqom-QFcNP
+           8Sjg086MwoqQU_LYywlAGZ21WSdS_PERyGFiNnj3QQlO8Yns5jCtLCRwLHL0
+           Pb1fEv45AuRIuUfVcPySBWYnDyGxvjYGDSM-AqWS9zIQ2ZilgT-GqUmipg0X
+           OC0Cc20rgLe2ymLHjpHciCKVAbY5-L32-lSeZO-Os6U15_aXrk9Gw8cPUaX1
+           _I8sLGuSiVdt3C_Fn2PZ3Z8i744FPFGGcG1qs2Wz-Q",
+      "e":"AQAB",
+      "d":"GRtbIQmhOZtyszfgKdg4u_N-R_mZGU_9k7JQ_jn1DnfTuMdSNprTeaSTyWfS
+           NkuaAwnOEbIQVy1IQbWVV25NY3ybc_IhUJtfri7bAXYEReWaCl3hdlPKXy9U
+           vqPYGR0kIXTQRqns-dVJ7jahlI7LyckrpTmrM8dWBo4_PMaenNnPiQgO0xnu
+           ToxutRZJfJvG4Ox4ka3GORQd9CsCZ2vsUDmsXOfUENOyMqADC6p1M3h33tsu
+           rY15k9qMSpG9OX_IJAXmxzAh_tWiZOwk2K4yxH9tS3Lq1yX8C1EWmeRDkK2a
+           hecG85-oLKQt5VEpWHKmjOi_gJSdSgqcN96X52esAQ",
+      "p":"2rnSOV4hKSN8sS4CgcQHFbs08XboFDqKum3sc4h3GRxrTmQdl1ZK9uw-PIHf
+           QP0FkxXVrx-WE-ZEbrqivH_2iCLUS7wAl6XvARt1KkIaUxPPSYB9yk31s0Q8
+           UK96E3_OrADAYtAJs-M3JxCLfNgqh56HDnETTQhH3rCT5T3yJws",
+      "q":"1u_RiFDP7LBYh3N4GXLT9OpSKYP0uQZyiaZwBtOCBNJgQxaj10RWjsZu0c6I
+           edis4S7B_coSKB0Kj9PaPaBzg-IySRvvcQuPamQu66riMhjVtG6TlV8CLCYK
+           rYl52ziqK0E_ym2QnkwsUX7eYTB7LbAHRK9GqocDE5B0f808I4s",
+      "dp":"KkMTWqBUefVwZ2_Dbj1pPQqyHSHjj90L5x_MOzqYAJMcLMZtbUtwKqvVDq3
+           tbEo3ZIcohbDtt6SbfmWzggabpQxNxuBpoOOf_a_HgMXK_lhqigI4y_kqS1w
+           Y52IwjUn5rgRrJ-yYo1h41KR-vz2pYhEAeYrhttWtxVqLCRViD6c",
+      "dq":"AvfS0-gRxvn0bwJoMSnFxYcK1WnuEjQFluMGfwGitQBWtfZ1Er7t1xDkbN9
+           GQTB9yqpDoYaN06H7CFtrkxhJIBQaj6nkF5KKS3TQtQ5qCzkOkmxIe3KRbBy
+           mXxkb5qwUpX5ELD5xFc6FeiafWYY63TmmEAu_lRFCOJ3xDea-ots",
+      "qi":"lSQi-w9CpyUReMErP1RsBLk7wNtOvs5EQpPqmuMvqW57NBUczScEoPwmUqq
+           abu9V0-Py4dQ57_bapoKRu1R90bvuFnU63SHWEFglZQvJDMeAvmj4sm-Fp0o
+           Yu_neotgQ0hzbI5gry7ajdYy9-2lNx_76aBZoOUu9HCJ-UsfSOI8"}`),
+}
+
+// SHA-256 thumbprints of the above keys, hex-encoded
+var cookbookJWKThumbprints = []string{
+	"747ae2dd2003664aeeb21e4753fe7402846170a16bc8df8f23a8cf06d3cbe793",
+	"747ae2dd2003664aeeb21e4753fe7402846170a16bc8df8f23a8cf06d3cbe793",
+	"f63838e96077ad1fc01c3f8405774dedc0641f558ebb4b40dccf5f9b6d66a932",
+	"0fc478f8579325fcee0d4cbc6d9d1ce21730a6e97e435d6008fb379b0ebe47d4",
+}
+
+func TestWebKeyVectorsValid(t *testing.T) {
+	for _, key := range cookbookJWKs {
+		var jwk2 JsonWebKey
+		err := jwk2.UnmarshalJSON([]byte(key))
+		if err != nil {
+			t.Error("unable to parse valid key:", key, err)
+		}
+	}
+}
+
+func TestThumbprint(t *testing.T) {
+	for i, key := range cookbookJWKs {
+		var jwk2 JsonWebKey
+		err := jwk2.UnmarshalJSON([]byte(key))
+		if err != nil {
+			t.Error("unable to parse valid key:", key, err)
+		}
+
+		tp, err := jwk2.Thumbprint(crypto.SHA256)
+		if err != nil {
+			t.Error("unable to compute thumbprint:", key, err)
+		}
+
+		tpHex := hex.EncodeToString(tp)
+		if cookbookJWKThumbprints[i] != tpHex {
+			t.Error("incorrect thumbprint:", i, cookbookJWKThumbprints[i], tpHex)
+		}
+	}
+}
+
+func TestMarshalUnmarshalJWKSet(t *testing.T) {
+	jwk1 := JsonWebKey{Key: rsaTestKey, KeyID: "ABCDEFG", Algorithm: "foo"}
+	jwk2 := JsonWebKey{Key: rsaTestKey, KeyID: "GFEDCBA", Algorithm: "foo"}
+	var set JsonWebKeySet
+	set.Keys = append(set.Keys, jwk1)
+	set.Keys = append(set.Keys, jwk2)
+
+	jsonbar, err := MarshalJSON(&set)
+	if err != nil {
+		t.Error("problem marshalling set", err)
+	}
+	var set2 JsonWebKeySet
+	err = UnmarshalJSON(jsonbar, &set2)
+	if err != nil {
+		t.Error("problem unmarshalling set", err)
+	}
+	jsonbar2, err := MarshalJSON(&set2)
+	if err != nil {
+		t.Error("problem marshalling set", err)
+	}
+	if !bytes.Equal(jsonbar, jsonbar2) {
+		t.Error("roundtrip should not lose information")
+	}
+}
+
+func TestJWKSetKey(t *testing.T) {
+	jwk1 := JsonWebKey{Key: rsaTestKey, KeyID: "ABCDEFG", Algorithm: "foo"}
+	jwk2 := JsonWebKey{Key: rsaTestKey, KeyID: "GFEDCBA", Algorithm: "foo"}
+	var set JsonWebKeySet
+	set.Keys = append(set.Keys, jwk1)
+	set.Keys = append(set.Keys, jwk2)
+	k := set.Key("ABCDEFG")
+	if len(k) != 1 {
+		t.Errorf("method should return slice with one key not %d", len(k))
+	}
+	if k[0].KeyID != "ABCDEFG" {
+		t.Error("method should return key with ID ABCDEFG")
+	}
+}
+
+func TestJWKSymmetricKey(t *testing.T) {
+	sample1 := `{"kty":"oct","alg":"A128KW","k":"GawgguFyGrWKav7AX4VKUg"}`
+	sample2 := `{"kty":"oct","k":"AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow","kid":"HMAC key used in JWS spec Appendix A.1 example"}`
+
+	var jwk1 JsonWebKey
+	UnmarshalJSON([]byte(sample1), &jwk1)
+
+	if jwk1.Algorithm != "A128KW" {
+		t.Errorf("expected Algorithm to be A128KW, but was '%s'", jwk1.Algorithm)
+	}
+	expected1 := fromHexBytes("19ac2082e1721ab58a6afec05f854a52")
+	if !bytes.Equal(jwk1.Key.([]byte), expected1) {
+		t.Errorf("expected Key to be '%s', but was '%s'", hex.EncodeToString(expected1), hex.EncodeToString(jwk1.Key.([]byte)))
+	}
+
+	var jwk2 JsonWebKey
+	UnmarshalJSON([]byte(sample2), &jwk2)
+
+	if jwk2.KeyID != "HMAC key used in JWS spec Appendix A.1 example" {
+		t.Errorf("expected KeyID to be 'HMAC key used in JWS spec Appendix A.1 example', but was '%s'", jwk2.KeyID)
+	}
+	expected2 := fromHexBytes(`
+    0323354b2b0fa5bc837e0665777ba68f5ab328e6f054c928a90f84b2d2502ebf
+    d3fb5a92d20647ef968ab4c377623d223d2e2172052e4f08c0cd9af567d080a3`)
+	if !bytes.Equal(jwk2.Key.([]byte), expected2) {
+		t.Errorf("expected Key to be '%s', but was '%s'", hex.EncodeToString(expected2), hex.EncodeToString(jwk2.Key.([]byte)))
+	}
+}
+
+func TestJWKSymmetricRoundtrip(t *testing.T) {
+	jwk1 := JsonWebKey{Key: []byte{1, 2, 3, 4}}
+	marshaled, err := jwk1.MarshalJSON()
+	if err != nil {
+		t.Errorf("failed to marshal valid JWK object", err)
+	}
+
+	var jwk2 JsonWebKey
+	err = jwk2.UnmarshalJSON(marshaled)
+	if err != nil {
+		t.Errorf("failed to unmarshal valid JWK object", err)
+	}
+
+	if !bytes.Equal(jwk1.Key.([]byte), jwk2.Key.([]byte)) {
+		t.Error("round-trip of symmetric JWK gave different raw keys")
+	}
+}
+
+func TestJWKSymmetricInvalid(t *testing.T) {
+	invalid := JsonWebKey{}
+	_, err := invalid.MarshalJSON()
+	if err == nil {
+		t.Error("excepted error on marshaling invalid symmetric JWK object")
+	}
+
+	var jwk JsonWebKey
+	err = jwk.UnmarshalJSON([]byte(`{"kty":"oct"}`))
+	if err == nil {
+		t.Error("excepted error on unmarshaling invalid symmetric JWK object")
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jws.go

@@ -0,0 +1,252 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"fmt"
+	"strings"
+)
+
+// rawJsonWebSignature represents a raw JWS JSON object. Used for parsing/serializing.
+type rawJsonWebSignature struct {
+	Payload    *byteBuffer        `json:"payload,omitempty"`
+	Signatures []rawSignatureInfo `json:"signatures,omitempty"`
+	Protected  *byteBuffer        `json:"protected,omitempty"`
+	Header     *rawHeader         `json:"header,omitempty"`
+	Signature  *byteBuffer        `json:"signature,omitempty"`
+}
+
+// rawSignatureInfo represents a single JWS signature over the JWS payload and protected header.
+type rawSignatureInfo struct {
+	Protected *byteBuffer `json:"protected,omitempty"`
+	Header    *rawHeader  `json:"header,omitempty"`
+	Signature *byteBuffer `json:"signature,omitempty"`
+}
+
+// JsonWebSignature represents a signed JWS object after parsing.
+type JsonWebSignature struct {
+	payload    []byte
+	Signatures []Signature
+}
+
+// Signature represents a single signature over the JWS payload and protected header.
+type Signature struct {
+	// Header fields, such as the signature algorithm
+	Header JoseHeader
+
+	// The actual signature value
+	Signature []byte
+
+	protected *rawHeader
+	header    *rawHeader
+	original  *rawSignatureInfo
+}
+
+// ParseSigned parses an encrypted message in compact or full serialization format.
+func ParseSigned(input string) (*JsonWebSignature, error) {
+	input = stripWhitespace(input)
+	if strings.HasPrefix(input, "{") {
+		return parseSignedFull(input)
+	}
+
+	return parseSignedCompact(input)
+}
+
+// Get a header value
+func (sig Signature) mergedHeaders() rawHeader {
+	out := rawHeader{}
+	out.merge(sig.protected)
+	out.merge(sig.header)
+	return out
+}
+
+// Compute data to be signed
+func (obj JsonWebSignature) computeAuthData(signature *Signature) []byte {
+	var serializedProtected string
+
+	if signature.original != nil && signature.original.Protected != nil {
+		serializedProtected = signature.original.Protected.base64()
+	} else if signature.protected != nil {
+		serializedProtected = base64URLEncode(mustSerializeJSON(signature.protected))
+	} else {
+		serializedProtected = ""
+	}
+
+	return []byte(fmt.Sprintf("%s.%s",
+		serializedProtected,
+		base64URLEncode(obj.payload)))
+}
+
+// parseSignedFull parses a message in full format.
+func parseSignedFull(input string) (*JsonWebSignature, error) {
+	var parsed rawJsonWebSignature
+	err := UnmarshalJSON([]byte(input), &parsed)
+	if err != nil {
+		return nil, err
+	}
+
+	return parsed.sanitized()
+}
+
+// sanitized produces a cleaned-up JWS object from the raw JSON.
+func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
+	if parsed.Payload == nil {
+		return nil, fmt.Errorf("square/go-jose: missing payload in JWS message")
+	}
+
+	obj := &JsonWebSignature{
+		payload:    parsed.Payload.bytes(),
+		Signatures: make([]Signature, len(parsed.Signatures)),
+	}
+
+	if len(parsed.Signatures) == 0 {
+		// No signatures array, must be flattened serialization
+		signature := Signature{}
+		if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
+			signature.protected = &rawHeader{}
+			err := UnmarshalJSON(parsed.Protected.bytes(), signature.protected)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if parsed.Header != nil && parsed.Header.Nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
+
+		signature.header = parsed.Header
+		signature.Signature = parsed.Signature.bytes()
+		// Make a fake "original" rawSignatureInfo to store the unprocessed
+		// Protected header. This is necessary because the Protected header can
+		// contain arbitrary fields not registered as part of the spec. See
+		// https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#section-4
+		// If we unmarshal Protected into a rawHeader with its explicit list of fields,
+		// we cannot marshal losslessly. So we have to keep around the original bytes.
+		// This is used in computeAuthData, which will first attempt to use
+		// the original bytes of a protected header, and fall back on marshaling the
+		// header struct only if those bytes are not available.
+		signature.original = &rawSignatureInfo{
+			Protected: parsed.Protected,
+			Header:    parsed.Header,
+			Signature: parsed.Signature,
+		}
+
+		signature.Header = signature.mergedHeaders().sanitized()
+		obj.Signatures = append(obj.Signatures, signature)
+	}
+
+	for i, sig := range parsed.Signatures {
+		if sig.Protected != nil && len(sig.Protected.bytes()) > 0 {
+			obj.Signatures[i].protected = &rawHeader{}
+			err := UnmarshalJSON(sig.Protected.bytes(), obj.Signatures[i].protected)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		// Check that there is not a nonce in the unprotected header
+		if sig.Header != nil && sig.Header.Nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
+
+		obj.Signatures[i].Signature = sig.Signature.bytes()
+
+		// Copy value of sig
+		original := sig
+
+		obj.Signatures[i].header = sig.Header
+		obj.Signatures[i].original = &original
+		obj.Signatures[i].Header = obj.Signatures[i].mergedHeaders().sanitized()
+	}
+
+	return obj, nil
+}
+
+// parseSignedCompact parses a message in compact format.
+func parseSignedCompact(input string) (*JsonWebSignature, error) {
+	parts := strings.Split(input, ".")
+	if len(parts) != 3 {
+		return nil, fmt.Errorf("square/go-jose: compact JWS format must have three parts")
+	}
+
+	rawProtected, err := base64URLDecode(parts[0])
+	if err != nil {
+		return nil, err
+	}
+
+	payload, err := base64URLDecode(parts[1])
+	if err != nil {
+		return nil, err
+	}
+
+	signature, err := base64URLDecode(parts[2])
+	if err != nil {
+		return nil, err
+	}
+
+	raw := &rawJsonWebSignature{
+		Payload:   newBuffer(payload),
+		Protected: newBuffer(rawProtected),
+		Signature: newBuffer(signature),
+	}
+	return raw.sanitized()
+}
+
+// CompactSerialize serializes an object using the compact serialization format.
+func (obj JsonWebSignature) CompactSerialize() (string, error) {
+	if len(obj.Signatures) != 1 || obj.Signatures[0].header != nil || obj.Signatures[0].protected == nil {
+		return "", ErrNotSupported
+	}
+
+	serializedProtected := mustSerializeJSON(obj.Signatures[0].protected)
+
+	return fmt.Sprintf(
+		"%s.%s.%s",
+		base64URLEncode(serializedProtected),
+		base64URLEncode(obj.payload),
+		base64URLEncode(obj.Signatures[0].Signature)), nil
+}
+
+// FullSerialize serializes an object using the full JSON serialization format.
+func (obj JsonWebSignature) FullSerialize() string {
+	raw := rawJsonWebSignature{
+		Payload: newBuffer(obj.payload),
+	}
+
+	if len(obj.Signatures) == 1 {
+		if obj.Signatures[0].protected != nil {
+			serializedProtected := mustSerializeJSON(obj.Signatures[0].protected)
+			raw.Protected = newBuffer(serializedProtected)
+		}
+		raw.Header = obj.Signatures[0].header
+		raw.Signature = newBuffer(obj.Signatures[0].Signature)
+	} else {
+		raw.Signatures = make([]rawSignatureInfo, len(obj.Signatures))
+		for i, signature := range obj.Signatures {
+			raw.Signatures[i] = rawSignatureInfo{
+				Header:    signature.header,
+				Signature: newBuffer(signature.Signature),
+			}
+
+			if signature.protected != nil {
+				raw.Signatures[i].Protected = newBuffer(mustSerializeJSON(signature.protected))
+			}
+		}
+	}
+
+	return string(mustSerializeJSON(raw))
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/jws_test.go

@@ -0,0 +1,302 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+)
+
+func TestCompactParseJWS(t *testing.T) {
+	// Should parse
+	msg := "eyJhbGciOiJYWVoifQ.cGF5bG9hZA.c2lnbmF0dXJl"
+	_, err := ParseSigned(msg)
+	if err != nil {
+		t.Error("Unable to parse valid message:", err)
+	}
+
+	// Messages that should fail to parse
+	failures := []string{
+		// Not enough parts
+		"eyJhbGciOiJYWVoifQ.cGF5bG9hZA",
+		// Invalid signature
+		"eyJhbGciOiJYWVoifQ.cGF5bG9hZA.////",
+		// Invalid payload
+		"eyJhbGciOiJYWVoifQ.////.c2lnbmF0dXJl",
+		// Invalid header
+		"////.eyJhbGciOiJYWVoifQ.c2lnbmF0dXJl",
+		// Invalid header
+		"cGF5bG9hZA.cGF5bG9hZA.c2lnbmF0dXJl",
+	}
+
+	for i := range failures {
+		_, err = ParseSigned(failures[i])
+		if err == nil {
+			t.Error("Able to parse invalid message")
+		}
+	}
+}
+
+func TestFullParseJWS(t *testing.T) {
+	// Messages that should succeed to parse
+	successes := []string{
+		"{\"payload\":\"CUJD\",\"signatures\":[{\"protected\":\"e30\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"CUJD\"},{\"protected\":\"e30\",\"signature\":\"CUJD\"}]}",
+	}
+
+	for i := range successes {
+		_, err := ParseSigned(successes[i])
+		if err != nil {
+			t.Error("Unble to parse valid message", err, successes[i])
+		}
+	}
+
+	// Messages that should fail to parse
+	failures := []string{
+		// Empty
+		"{}",
+		// Invalid JSON
+		"{XX",
+		// Invalid protected header
+		"{\"payload\":\"CUJD\",\"signatures\":[{\"protected\":\"CUJD\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"CUJD\"}]}",
+		// Invalid protected header
+		"{\"payload\":\"CUJD\",\"protected\":\"CUJD\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"CUJD\"}",
+		// Invalid protected header
+		"{\"payload\":\"CUJD\",\"signatures\":[{\"protected\":\"###\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"CUJD\"}]}",
+		// Invalid payload
+		"{\"payload\":\"###\",\"signatures\":[{\"protected\":\"CUJD\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"CUJD\"}]}",
+		// Invalid payload
+		"{\"payload\":\"CUJD\",\"signatures\":[{\"protected\":\"e30\",\"header\":{\"kid\":\"XYZ\"},\"signature\":\"###\"}]}",
+	}
+
+	for i := range failures {
+		_, err := ParseSigned(failures[i])
+		if err == nil {
+			t.Error("Able to parse invalid message", err, failures[i])
+		}
+	}
+}
+
+func TestRejectUnprotectedJWSNonce(t *testing.T) {
+	// No need to test compact, since that's always protected
+
+	// Flattened JSON
+	input := `{
+		"header": { "nonce": "should-cause-an-error" },
+		"payload": "does-not-matter",
+		"signature": "does-not-matter"
+	}`
+	_, err := ParseSigned(input)
+	if err == nil {
+		t.Error("JWS with an unprotected nonce parsed as valid.")
+	} else if err != ErrUnprotectedNonce {
+		t.Errorf("Improper error for unprotected nonce: %v", err)
+	}
+
+	// Full JSON
+	input = `{
+		"payload": "does-not-matter",
+ 		"signatures": [{
+ 			"header": { "nonce": "should-cause-an-error" },
+			"signature": "does-not-matter"
+		}]
+	}`
+	_, err = ParseSigned(input)
+	if err == nil {
+		t.Error("JWS with an unprotected nonce parsed as valid.")
+	} else if err != ErrUnprotectedNonce {
+		t.Errorf("Improper error for unprotected nonce: %v", err)
+	}
+}
+
+func TestVerifyFlattenedWithIncludedUnprotectedKey(t *testing.T) {
+	input := `{
+			"header": {
+					"alg": "RS256",
+					"jwk": {
+							"e": "AQAB",
+							"kty": "RSA",
+							"n": "tSwgy3ORGvc7YJI9B2qqkelZRUC6F1S5NwXFvM4w5-M0TsxbFsH5UH6adigV0jzsDJ5imAechcSoOhAh9POceCbPN1sTNwLpNbOLiQQ7RD5mY_pSUHWXNmS9R4NZ3t2fQAzPeW7jOfF0LKuJRGkekx6tXP1uSnNibgpJULNc4208dgBaCHo3mvaE2HV2GmVl1yxwWX5QZZkGQGjNDZYnjFfa2DKVvFs0QbAk21ROm594kAxlRlMMrvqlf24Eq4ERO0ptzpZgm_3j_e4hGRD39gJS7kAzK-j2cacFQ5Qi2Y6wZI2p-FCq_wiYsfEAIkATPBiLKl_6d_Jfcvs_impcXQ"
+					}
+			},
+			"payload": "Zm9vCg",
+			"signature": "hRt2eYqBd_MyMRNIh8PEIACoFtmBi7BHTLBaAhpSU6zyDAFdEBaX7us4VB9Vo1afOL03Q8iuoRA0AT4akdV_mQTAQ_jhTcVOAeXPr0tB8b8Q11UPQ0tXJYmU4spAW2SapJIvO50ntUaqU05kZd0qw8-noH1Lja-aNnU-tQII4iYVvlTiRJ5g8_CADsvJqOk6FcHuo2mG643TRnhkAxUtazvHyIHeXMxydMMSrpwUwzMtln4ZJYBNx4QGEq6OhpAD_VSp-w8Lq5HOwGQoNs0bPxH1SGrArt67LFQBfjlVr94E1sn26p4vigXm83nJdNhWAMHHE9iV67xN-r29LT-FjA"
+	}`
+
+	jws, err := ParseSigned(input)
+	if err != nil {
+		t.Error("Unable to parse valid message.")
+	}
+	if len(jws.Signatures) != 1 {
+		t.Error("Too many or too few signatures.")
+	}
+	sig := jws.Signatures[0]
+	if sig.Header.JsonWebKey == nil {
+		t.Error("No JWK in signature header.")
+	}
+	payload, err := jws.Verify(sig.Header.JsonWebKey)
+	if err != nil {
+		t.Error(fmt.Sprintf("Signature did not validate: %v", err))
+	}
+	if string(payload) != "foo\n" {
+		t.Error(fmt.Sprintf("Payload was incorrect: '%s' should have been 'foo\\n'", string(payload)))
+	}
+}
+
+func TestVerifyFlattenedWithPrivateProtected(t *testing.T) {
+	// The protected field contains a Private Header Parameter name, per
+	// https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#section-4
+	// Base64-decoded, it's '{"nonce":"8HIepUNFZUa-exKTrXVf4g"}'
+	input := `{"header":{"alg":"RS256","jwk":{"kty":"RSA","n":"7ixeydcbxxppzxrBphrW1atUiEZqTpiHDpI-79olav5XxAgWolHmVsJyxzoZXRxmtED8PF9-EICZWBGdSAL9ZTD0hLUCIsPcpdgT_LqNW3Sh2b2caPL2hbMF7vsXvnCGg9varpnHWuYTyRrCLUF9vM7ES-V3VCYTa7LcCSRm56Gg9r19qar43Z9kIKBBxpgt723v2cC4bmLmoAX2s217ou3uCpCXGLOeV_BesG4--Nl3pso1VhCfO85wEWjmW6lbv7Kg4d7Jdkv5DjDZfJ086fkEAYZVYGRpIgAvJBH3d3yKDCrSByUEud1bWuFjQBmMaeYOrVDXO_mbYg5PwUDMhw","e":"AQAB"}},"protected":"eyJub25jZSI6IjhISWVwVU5GWlVhLWV4S1RyWFZmNGcifQ","payload":"eyJjb250YWN0IjpbIm1haWx0bzpmb29AYmFyLmNvbSJdfQ","signature":"AyvVGMgXsQ1zTdXrZxE_gyO63pQgotL1KbI7gv6Wi8I7NRy0iAOkDAkWcTQT9pcCYApJ04lXfEDZfP5i0XgcFUm_6spxi5mFBZU-NemKcvK9dUiAbXvb4hB3GnaZtZiuVnMQUb_ku4DOaFFKbteA6gOYCnED_x7v0kAPHIYrQnvIa-KZ6pTajbV9348zgh9TL7NgGIIsTcMHd-Jatr4z1LQ0ubGa8tS300hoDhVzfoDQaEetYjCo1drR1RmdEN1SIzXdHOHfubjA3ZZRbrF_AJnNKpRRoIwzu1VayOhRmdy1qVSQZq_tENF4VrQFycEL7DhG7JLoXC4T2p1urwMlsw"}`
+
+	jws, err := ParseSigned(input)
+	if err != nil {
+		t.Error("Unable to parse valid message.")
+	}
+	if len(jws.Signatures) != 1 {
+		t.Error("Too many or too few signatures.")
+	}
+	sig := jws.Signatures[0]
+	if sig.Header.JsonWebKey == nil {
+		t.Error("No JWK in signature header.")
+	}
+	payload, err := jws.Verify(sig.Header.JsonWebKey)
+	if err != nil {
+		t.Error(fmt.Sprintf("Signature did not validate: %v", err))
+	}
+	expected := "{\"contact\":[\"mailto:foo@bar.com\"]}"
+	if string(payload) != expected {
+		t.Error(fmt.Sprintf("Payload was incorrect: '%s' should have been '%s'", string(payload), expected))
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestSampleNimbusJWSMessagesRSA(t *testing.T) {
+	rsaPublicKey, err := LoadPublicKey(fromBase64Bytes(`
+		MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3aLSGwbeX0ZA2Ha+EvELaIFGzO
+		91+Q15JQc/tdGdCgGW3XAbrh7ZUhDh1XKzbs+UOQxqn3Eq4YOx18IG0WsJSuCaHQIxnDlZ
+		t/GP8WLwjMC0izlJLm2SyfM/EEoNpmTC3w6MQ2dHK7SZ9Zoq+sKijQd+V7CYdr8zHMpDrd
+		NKoEcR0HjmvzzdMoUChhkGH5TaNbZyollULTggepaYUKS8QphqdSDMWiSetKG+g6V87lv6
+		CVYyK1FF6g7Esp5OOj5pNn3/bmF+7V+b7TvK91NCIlURCjE9toRgNoIP4TDnWRn/vvfZ3G
+		zNrtWmlizqz3r5KdvIs71ahWgMUSD4wfazrwIDAQAB`))
+	if err != nil {
+		panic(err)
+	}
+
+	rsaSampleMessages := []string{
+		"eyJhbGciOiJSUzI1NiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.YHX849fvekz6wJGeyqnQhFqyHFcUXNJKj3o2w3ddR46YLlsCopUJrlifRU_ZuTWzpYxt5oC--T2eoqMhlCvltSWrE5_1_EumqiMfAYsZULx9E6Jns7q3w7mttonYFSIh7aR3-yg2HMMfTCgoAY1y_AZ4VjXwHDcZ5gu1oZDYgvZF4uXtCmwT6e5YtR1m8abiWPF8BgoTG_BD3KV6ClLj_QQiNFdfdxAMDw7vKVOKG1T7BFtz6cDs2Q3ILS4To5E2IjcVSSYS8mi77EitCrWmrqbK_G3WCdKeUFGnMnyuKXaCDy_7FLpAZ6Z5RomRr5iskXeJZdZqIKcJV8zl4fpsPA",
+		"eyJhbGciOiJSUzM4NCJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.meyfoOTjAAjXHFYiNlU7EEnsYtbeUYeEglK6BL_cxISEr2YAGLr1Gwnn2HnucTnH6YilyRio7ZC1ohy_ZojzmaljPHqpr8kn1iqNFu9nFE2M16ZPgJi38-PGzppcDNliyzOQO-c7L-eA-v8Gfww5uyRaOJdiWg-hUJmeGBIngPIeLtSVmhJtz8oTeqeNdUOqQv7f7VRCuvagLhW1PcEM91VUS-gS0WEUXoXWZ2lp91No0v1O24izgX3__FKiX_16XhrOfAgJ82F61vjbTIQYwhexHPZyYTlXYt_scNRzFGhSKeGFin4zVdFLOXWJqKWdUd5IrDP5Nya3FSoWbWDXAg",
+		"eyJhbGciOiJSUzUxMiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.rQPz0PDh8KyE2AX6JorgI0MLwv-qi1tcWlz6tuZuWQG1hdrlzq5tR1tQg1evYNc_SDDX87DWTSKXT7JEqhKoFixLfZa13IJrOc7FB8r5ZLx7OwOBC4F--OWrvxMA9Y3MTJjPN3FemQePUo-na2vNUZv-YgkcbuOgbO3hTxwQ7j1JGuqy-YutXOFnccdXvntp3t8zYZ4Mg1It_IyL9pzgGqHIEmMV1pCFGHsDa-wStB4ffmdhrADdYZc0q_SvxUdobyC_XzZCz9ENzGIhgwYxyyrqg7kjqUGoKmCLmoSlUFW7goTk9IC5SXdUyLPuESxOWNfHoRClGav230GYjPFQFA",
+		"eyJhbGciOiJQUzI1NiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.UTtxjsv_6x4CdlAmZfAW6Lun3byMjJbcwRp_OlPH2W4MZaZar7aql052mIB_ddK45O9VUz2aphYVRvKPZY8WHmvlTUU30bk0z_cDJRYB9eIJVMOiRCYj0oNkz1iEZqsP0YgngxwuUDv4Q4A6aJ0Bo5E_rZo3AnrVHMHUjPp_ZRRSBFs30tQma1qQ0ApK4Gxk0XYCYAcxIv99e78vldVRaGzjEZmQeAVZx4tGcqZP20vG1L84nlhSGnOuZ0FhR8UjRFLXuob6M7EqtMRoqPgRYw47EI3fYBdeSivAg98E5S8R7R1NJc7ef-l03RvfUSY0S3_zBq_4PlHK6A-2kHb__w",
+		"eyJhbGciOiJSUzM4NCJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.meyfoOTjAAjXHFYiNlU7EEnsYtbeUYeEglK6BL_cxISEr2YAGLr1Gwnn2HnucTnH6YilyRio7ZC1ohy_ZojzmaljPHqpr8kn1iqNFu9nFE2M16ZPgJi38-PGzppcDNliyzOQO-c7L-eA-v8Gfww5uyRaOJdiWg-hUJmeGBIngPIeLtSVmhJtz8oTeqeNdUOqQv7f7VRCuvagLhW1PcEM91VUS-gS0WEUXoXWZ2lp91No0v1O24izgX3__FKiX_16XhrOfAgJ82F61vjbTIQYwhexHPZyYTlXYt_scNRzFGhSKeGFin4zVdFLOXWJqKWdUd5IrDP5Nya3FSoWbWDXAg",
+		"eyJhbGciOiJSUzUxMiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.rQPz0PDh8KyE2AX6JorgI0MLwv-qi1tcWlz6tuZuWQG1hdrlzq5tR1tQg1evYNc_SDDX87DWTSKXT7JEqhKoFixLfZa13IJrOc7FB8r5ZLx7OwOBC4F--OWrvxMA9Y3MTJjPN3FemQePUo-na2vNUZv-YgkcbuOgbO3hTxwQ7j1JGuqy-YutXOFnccdXvntp3t8zYZ4Mg1It_IyL9pzgGqHIEmMV1pCFGHsDa-wStB4ffmdhrADdYZc0q_SvxUdobyC_XzZCz9ENzGIhgwYxyyrqg7kjqUGoKmCLmoSlUFW7goTk9IC5SXdUyLPuESxOWNfHoRClGav230GYjPFQFA",
+	}
+
+	for _, msg := range rsaSampleMessages {
+		obj, err := ParseSigned(msg)
+		if err != nil {
+			t.Error("unable to parse message", msg, err)
+			continue
+		}
+		payload, err := obj.Verify(rsaPublicKey)
+		if err != nil {
+			t.Error("unable to verify message", msg, err)
+			continue
+		}
+		if string(payload) != "Lorem ipsum dolor sit amet" {
+			t.Error("payload is not what we expected for msg", msg)
+		}
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestSampleNimbusJWSMessagesEC(t *testing.T) {
+	ecPublicKeyP256, err := LoadPublicKey(fromBase64Bytes("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEIg62jq6FyL1otEj9Up7S35BUrwGF9TVrAzrrY1rHUKZqYIGEg67u/imjgadVcr7y9Q32I0gB8W8FHqbqt696rA=="))
+	if err != nil {
+		panic(err)
+	}
+	ecPublicKeyP384, err := LoadPublicKey(fromBase64Bytes("MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAEPXsVlqCtN2oTY+F+hFZm3M0ldYpb7IeeJM5wYmT0k1RaqzBFDhDMNnYK5Q5x+OyssZrAtHgYDFw02AVJhhng/eHRp7mqmL/vI3wbxJtrLKYldIbBA+9fYBQcKeibjlu5"))
+	if err != nil {
+		panic(err)
+	}
+	ecPublicKeyP521, err := LoadPublicKey(fromBase64Bytes("MIGbMBAGByqGSM49AgEGBSuBBAAjA4GGAAQAa2w3MMJ5FWD6tSf68G+Wy5jIhWXOD3IA7pE5IC/myQzo1lWcD8KS57SM6nm4POtPcxyLmDhL7FLuh8DKoIZyvtAAdK8+tOQP7XXRlT2bkvzIuazp05It3TAPu00YzTIpKfDlc19Y1lvf7etrbFqhShD92B+hHmhT4ddrdbPCBDW8hvU="))
+	if err != nil {
+		panic(err)
+	}
+
+	ecPublicKeys := []interface{}{ecPublicKeyP256, ecPublicKeyP384, ecPublicKeyP521}
+
+	ecSampleMessages := []string{
+		"eyJhbGciOiJFUzI1NiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.MEWJVlvGRQyzMEGOYm4rwuiwxrX-6LjnlbaRDAuhwmnBm2Gtn7pRpGXRTMFZUXsSGDz2L1p-Hz1qn8j9bFIBtQ",
+		"eyJhbGciOiJFUzM4NCJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.nbdjPnJPYQtVNNdBIx8-KbFKplTxrz-hnW5UNhYUY7SBkwHK4NZnqc2Lv4DXoA0aWHq9eiypgOh1kmyPWGEmqKAHUx0xdIEkBoHk3ZsbmhOQuq2jL_wcMUG6nTWNhLrB",
+		"eyJhbGciOiJFUzUxMiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.AeYNFC1rwIgQv-5fwd8iRyYzvTaSCYTEICepgu9gRId-IW99kbSVY7yH0MvrQnqI-a0L8zwKWDR35fW5dukPAYRkADp3Y1lzqdShFcEFziUVGo46vqbiSajmKFrjBktJcCsfjKSaLHwxErF-T10YYPCQFHWb2nXJOOI3CZfACYqgO84g",
+	}
+
+	for i, msg := range ecSampleMessages {
+		obj, err := ParseSigned(msg)
+		if err != nil {
+			t.Error("unable to parse message", msg, err)
+			continue
+		}
+		payload, err := obj.Verify(ecPublicKeys[i])
+		if err != nil {
+			t.Error("unable to verify message", msg, err)
+			continue
+		}
+		if string(payload) != "Lorem ipsum dolor sit amet" {
+			t.Error("payload is not what we expected for msg", msg)
+		}
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestSampleNimbusJWSMessagesHMAC(t *testing.T) {
+	hmacTestKey := fromHexBytes("DF1FA4F36FFA7FC42C81D4B3C033928D")
+
+	hmacSampleMessages := []string{
+		"eyJhbGciOiJIUzI1NiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.W5tc_EUhxexcvLYEEOckyyvdb__M5DQIVpg6Nmk1XGM",
+		"eyJhbGciOiJIUzM4NCJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.sBu44lXOJa4Nd10oqOdYH2uz3lxlZ6o32QSGHaoGdPtYTDG5zvSja6N48CXKqdAh",
+		"eyJhbGciOiJIUzUxMiJ9.TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ.M0yR4tmipsORIix-BitIbxEPGaxPchDfj8UNOpKuhDEfnb7URjGvCKn4nOlyQ1z9mG1FKbwnqR1hOVAWSzAU_w",
+	}
+
+	for _, msg := range hmacSampleMessages {
+		obj, err := ParseSigned(msg)
+		if err != nil {
+			t.Error("unable to parse message", msg, err)
+			continue
+		}
+		payload, err := obj.Verify(hmacTestKey)
+		if err != nil {
+			t.Error("unable to verify message", msg, err)
+			continue
+		}
+		if string(payload) != "Lorem ipsum dolor sit amet" {
+			t.Error("payload is not what we expected for msg", msg)
+		}
+	}
+}
+
+// Test vectors generated with nimbus-jose-jwt
+func TestErrorMissingPayloadJWS(t *testing.T) {
+	_, err := (&rawJsonWebSignature{}).sanitized()
+	if err == nil {
+		t.Error("was able to parse message with missing payload")
+	}
+	if !strings.Contains(err.Error(), "missing payload") {
+		t.Errorf("unexpected error message, should contain 'missing payload': %s", err)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/shared.go

@@ -0,0 +1,224 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/elliptic"
+	"errors"
+	"fmt"
+)
+
+// KeyAlgorithm represents a key management algorithm.
+type KeyAlgorithm string
+
+// SignatureAlgorithm represents a signature (or MAC) algorithm.
+type SignatureAlgorithm string
+
+// ContentEncryption represents a content encryption algorithm.
+type ContentEncryption string
+
+// CompressionAlgorithm represents an algorithm used for plaintext compression.
+type CompressionAlgorithm string
+
+var (
+	// ErrCryptoFailure represents an error in cryptographic primitive. This
+	// occurs when, for example, a message had an invalid authentication tag or
+	// could not be decrypted.
+	ErrCryptoFailure = errors.New("square/go-jose: error in cryptographic primitive")
+
+	// ErrUnsupportedAlgorithm indicates that a selected algorithm is not
+	// supported. This occurs when trying to instantiate an encrypter for an
+	// algorithm that is not yet implemented.
+	ErrUnsupportedAlgorithm = errors.New("square/go-jose: unknown/unsupported algorithm")
+
+	// ErrUnsupportedKeyType indicates that the given key type/format is not
+	// supported. This occurs when trying to instantiate an encrypter and passing
+	// it a key of an unrecognized type or with unsupported parameters, such as
+	// an RSA private key with more than two primes.
+	ErrUnsupportedKeyType = errors.New("square/go-jose: unsupported key type/format")
+
+	// ErrNotSupported serialization of object is not supported. This occurs when
+	// trying to compact-serialize an object which can't be represented in
+	// compact form.
+	ErrNotSupported = errors.New("square/go-jose: compact serialization not supported for object")
+
+	// ErrUnprotectedNonce indicates that while parsing a JWS or JWE object, a
+	// nonce header parameter was included in an unprotected header object.
+	ErrUnprotectedNonce = errors.New("square/go-jose: Nonce parameter included in unprotected header")
+)
+
+// Key management algorithms
+const (
+	RSA1_5             = KeyAlgorithm("RSA1_5")             // RSA-PKCS1v1.5
+	RSA_OAEP           = KeyAlgorithm("RSA-OAEP")           // RSA-OAEP-SHA1
+	RSA_OAEP_256       = KeyAlgorithm("RSA-OAEP-256")       // RSA-OAEP-SHA256
+	A128KW             = KeyAlgorithm("A128KW")             // AES key wrap (128)
+	A192KW             = KeyAlgorithm("A192KW")             // AES key wrap (192)
+	A256KW             = KeyAlgorithm("A256KW")             // AES key wrap (256)
+	DIRECT             = KeyAlgorithm("dir")                // Direct encryption
+	ECDH_ES            = KeyAlgorithm("ECDH-ES")            // ECDH-ES
+	ECDH_ES_A128KW     = KeyAlgorithm("ECDH-ES+A128KW")     // ECDH-ES + AES key wrap (128)
+	ECDH_ES_A192KW     = KeyAlgorithm("ECDH-ES+A192KW")     // ECDH-ES + AES key wrap (192)
+	ECDH_ES_A256KW     = KeyAlgorithm("ECDH-ES+A256KW")     // ECDH-ES + AES key wrap (256)
+	A128GCMKW          = KeyAlgorithm("A128GCMKW")          // AES-GCM key wrap (128)
+	A192GCMKW          = KeyAlgorithm("A192GCMKW")          // AES-GCM key wrap (192)
+	A256GCMKW          = KeyAlgorithm("A256GCMKW")          // AES-GCM key wrap (256)
+	PBES2_HS256_A128KW = KeyAlgorithm("PBES2-HS256+A128KW") // PBES2 + HMAC-SHA256 + AES key wrap (128)
+	PBES2_HS384_A192KW = KeyAlgorithm("PBES2-HS384+A192KW") // PBES2 + HMAC-SHA384 + AES key wrap (192)
+	PBES2_HS512_A256KW = KeyAlgorithm("PBES2-HS512+A256KW") // PBES2 + HMAC-SHA512 + AES key wrap (256)
+)
+
+// Signature algorithms
+const (
+	HS256 = SignatureAlgorithm("HS256") // HMAC using SHA-256
+	HS384 = SignatureAlgorithm("HS384") // HMAC using SHA-384
+	HS512 = SignatureAlgorithm("HS512") // HMAC using SHA-512
+	RS256 = SignatureAlgorithm("RS256") // RSASSA-PKCS-v1.5 using SHA-256
+	RS384 = SignatureAlgorithm("RS384") // RSASSA-PKCS-v1.5 using SHA-384
+	RS512 = SignatureAlgorithm("RS512") // RSASSA-PKCS-v1.5 using SHA-512
+	ES256 = SignatureAlgorithm("ES256") // ECDSA using P-256 and SHA-256
+	ES384 = SignatureAlgorithm("ES384") // ECDSA using P-384 and SHA-384
+	ES512 = SignatureAlgorithm("ES512") // ECDSA using P-521 and SHA-512
+	PS256 = SignatureAlgorithm("PS256") // RSASSA-PSS using SHA256 and MGF1-SHA256
+	PS384 = SignatureAlgorithm("PS384") // RSASSA-PSS using SHA384 and MGF1-SHA384
+	PS512 = SignatureAlgorithm("PS512") // RSASSA-PSS using SHA512 and MGF1-SHA512
+)
+
+// Content encryption algorithms
+const (
+	A128CBC_HS256 = ContentEncryption("A128CBC-HS256") // AES-CBC + HMAC-SHA256 (128)
+	A192CBC_HS384 = ContentEncryption("A192CBC-HS384") // AES-CBC + HMAC-SHA384 (192)
+	A256CBC_HS512 = ContentEncryption("A256CBC-HS512") // AES-CBC + HMAC-SHA512 (256)
+	A128GCM       = ContentEncryption("A128GCM")       // AES-GCM (128)
+	A192GCM       = ContentEncryption("A192GCM")       // AES-GCM (192)
+	A256GCM       = ContentEncryption("A256GCM")       // AES-GCM (256)
+)
+
+// Compression algorithms
+const (
+	NONE    = CompressionAlgorithm("")    // No compression
+	DEFLATE = CompressionAlgorithm("DEF") // DEFLATE (RFC 1951)
+)
+
+// rawHeader represents the JOSE header for JWE/JWS objects (used for parsing).
+type rawHeader struct {
+	Alg   string               `json:"alg,omitempty"`
+	Enc   ContentEncryption    `json:"enc,omitempty"`
+	Zip   CompressionAlgorithm `json:"zip,omitempty"`
+	Crit  []string             `json:"crit,omitempty"`
+	Apu   *byteBuffer          `json:"apu,omitempty"`
+	Apv   *byteBuffer          `json:"apv,omitempty"`
+	Epk   *JsonWebKey          `json:"epk,omitempty"`
+	Iv    *byteBuffer          `json:"iv,omitempty"`
+	Tag   *byteBuffer          `json:"tag,omitempty"`
+	Jwk   *JsonWebKey          `json:"jwk,omitempty"`
+	Kid   string               `json:"kid,omitempty"`
+	Nonce string               `json:"nonce,omitempty"`
+}
+
+// JoseHeader represents the read-only JOSE header for JWE/JWS objects.
+type JoseHeader struct {
+	KeyID      string
+	JsonWebKey *JsonWebKey
+	Algorithm  string
+	Nonce      string
+}
+
+// sanitized produces a cleaned-up header object from the raw JSON.
+func (parsed rawHeader) sanitized() JoseHeader {
+	return JoseHeader{
+		KeyID:      parsed.Kid,
+		JsonWebKey: parsed.Jwk,
+		Algorithm:  parsed.Alg,
+		Nonce:      parsed.Nonce,
+	}
+}
+
+// Merge headers from src into dst, giving precedence to headers from l.
+func (dst *rawHeader) merge(src *rawHeader) {
+	if src == nil {
+		return
+	}
+
+	if dst.Alg == "" {
+		dst.Alg = src.Alg
+	}
+	if dst.Enc == "" {
+		dst.Enc = src.Enc
+	}
+	if dst.Zip == "" {
+		dst.Zip = src.Zip
+	}
+	if dst.Crit == nil {
+		dst.Crit = src.Crit
+	}
+	if dst.Crit == nil {
+		dst.Crit = src.Crit
+	}
+	if dst.Apu == nil {
+		dst.Apu = src.Apu
+	}
+	if dst.Apv == nil {
+		dst.Apv = src.Apv
+	}
+	if dst.Epk == nil {
+		dst.Epk = src.Epk
+	}
+	if dst.Iv == nil {
+		dst.Iv = src.Iv
+	}
+	if dst.Tag == nil {
+		dst.Tag = src.Tag
+	}
+	if dst.Kid == "" {
+		dst.Kid = src.Kid
+	}
+	if dst.Jwk == nil {
+		dst.Jwk = src.Jwk
+	}
+	if dst.Nonce == "" {
+		dst.Nonce = src.Nonce
+	}
+}
+
+// Get JOSE name of curve
+func curveName(crv elliptic.Curve) (string, error) {
+	switch crv {
+	case elliptic.P256():
+		return "P-256", nil
+	case elliptic.P384():
+		return "P-384", nil
+	case elliptic.P521():
+		return "P-521", nil
+	default:
+		return "", fmt.Errorf("square/go-jose: unsupported/unknown elliptic curve")
+	}
+}
+
+// Get size of curve in bytes
+func curveSize(crv elliptic.Curve) int {
+	bits := crv.Params().BitSize
+
+	div := bits / 8
+	mod := bits % 8
+
+	if mod == 0 {
+		return div
+	}
+
+	return div + 1
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/signing.go

@@ -0,0 +1,218 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"fmt"
+)
+
+// NonceSource represents a source of random nonces to go into JWS objects
+type NonceSource interface {
+	Nonce() (string, error)
+}
+
+// Signer represents a signer which takes a payload and produces a signed JWS object.
+type Signer interface {
+	Sign(payload []byte) (*JsonWebSignature, error)
+	SetNonceSource(source NonceSource)
+	SetEmbedJwk(embed bool)
+}
+
+// MultiSigner represents a signer which supports multiple recipients.
+type MultiSigner interface {
+	Sign(payload []byte) (*JsonWebSignature, error)
+	SetNonceSource(source NonceSource)
+	SetEmbedJwk(embed bool)
+	AddRecipient(alg SignatureAlgorithm, signingKey interface{}) error
+}
+
+type payloadSigner interface {
+	signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error)
+}
+
+type payloadVerifier interface {
+	verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error
+}
+
+type genericSigner struct {
+	recipients  []recipientSigInfo
+	nonceSource NonceSource
+	embedJwk    bool
+}
+
+type recipientSigInfo struct {
+	sigAlg    SignatureAlgorithm
+	keyID     string
+	publicKey *JsonWebKey
+	signer    payloadSigner
+}
+
+// NewSigner creates an appropriate signer based on the key type
+func NewSigner(alg SignatureAlgorithm, signingKey interface{}) (Signer, error) {
+	// NewMultiSigner never fails (currently)
+	signer := NewMultiSigner()
+
+	err := signer.AddRecipient(alg, signingKey)
+	if err != nil {
+		return nil, err
+	}
+
+	return signer, nil
+}
+
+// NewMultiSigner creates a signer for multiple recipients
+func NewMultiSigner() MultiSigner {
+	return &genericSigner{
+		recipients: []recipientSigInfo{},
+		embedJwk:   true,
+	}
+}
+
+// newVerifier creates a verifier based on the key type
+func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
+	switch verificationKey := verificationKey.(type) {
+	case *rsa.PublicKey:
+		return &rsaEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
+	case *ecdsa.PublicKey:
+		return &ecEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
+	case []byte:
+		return &symmetricMac{
+			key: verificationKey,
+		}, nil
+	case *JsonWebKey:
+		return newVerifier(verificationKey.Key)
+	default:
+		return nil, ErrUnsupportedKeyType
+	}
+}
+
+func (ctx *genericSigner) AddRecipient(alg SignatureAlgorithm, signingKey interface{}) error {
+	recipient, err := makeJWSRecipient(alg, signingKey)
+	if err != nil {
+		return err
+	}
+
+	ctx.recipients = append(ctx.recipients, recipient)
+	return nil
+}
+
+func makeJWSRecipient(alg SignatureAlgorithm, signingKey interface{}) (recipientSigInfo, error) {
+	switch signingKey := signingKey.(type) {
+	case *rsa.PrivateKey:
+		return newRSASigner(alg, signingKey)
+	case *ecdsa.PrivateKey:
+		return newECDSASigner(alg, signingKey)
+	case []byte:
+		return newSymmetricSigner(alg, signingKey)
+	case *JsonWebKey:
+		recipient, err := makeJWSRecipient(alg, signingKey.Key)
+		if err != nil {
+			return recipientSigInfo{}, err
+		}
+		recipient.keyID = signingKey.KeyID
+		return recipient, nil
+	default:
+		return recipientSigInfo{}, ErrUnsupportedKeyType
+	}
+}
+
+func (ctx *genericSigner) Sign(payload []byte) (*JsonWebSignature, error) {
+	obj := &JsonWebSignature{}
+	obj.payload = payload
+	obj.Signatures = make([]Signature, len(ctx.recipients))
+
+	for i, recipient := range ctx.recipients {
+		protected := &rawHeader{
+			Alg: string(recipient.sigAlg),
+		}
+
+		if recipient.publicKey != nil && ctx.embedJwk {
+			protected.Jwk = recipient.publicKey
+		}
+		if recipient.keyID != "" {
+			protected.Kid = recipient.keyID
+		}
+
+		if ctx.nonceSource != nil {
+			nonce, err := ctx.nonceSource.Nonce()
+			if err != nil {
+				return nil, fmt.Errorf("square/go-jose: Error generating nonce: %v", err)
+			}
+			protected.Nonce = nonce
+		}
+
+		serializedProtected := mustSerializeJSON(protected)
+
+		input := []byte(fmt.Sprintf("%s.%s",
+			base64URLEncode(serializedProtected),
+			base64URLEncode(payload)))
+
+		signatureInfo, err := recipient.signer.signPayload(input, recipient.sigAlg)
+		if err != nil {
+			return nil, err
+		}
+
+		signatureInfo.protected = protected
+		obj.Signatures[i] = signatureInfo
+	}
+
+	return obj, nil
+}
+
+// SetNonceSource provides or updates a nonce pool to the first recipients.
+// After this method is called, the signer will consume one nonce per
+// signature, returning an error it is unable to get a nonce.
+func (ctx *genericSigner) SetNonceSource(source NonceSource) {
+	ctx.nonceSource = source
+}
+
+// SetEmbedJwk specifies if the signing key should be embedded in the protected header,
+// if any. It defaults to 'true'.
+func (ctx *genericSigner) SetEmbedJwk(embed bool) {
+	ctx.embedJwk = embed
+}
+
+// Verify validates the signature on the object and returns the payload.
+func (obj JsonWebSignature) Verify(verificationKey interface{}) ([]byte, error) {
+	verifier, err := newVerifier(verificationKey)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, signature := range obj.Signatures {
+		headers := signature.mergedHeaders()
+		if len(headers.Crit) > 0 {
+			// Unsupported crit header
+			continue
+		}
+
+		input := obj.computeAuthData(&signature)
+		alg := SignatureAlgorithm(headers.Alg)
+		err := verifier.verifyPayload(input, signature.Signature, alg)
+		if err == nil {
+			return obj.payload, nil
+		}
+	}
+
+	return nil, ErrCryptoFailure
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/signing_test.go

@@ -0,0 +1,447 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"fmt"
+	"io"
+	"testing"
+)
+
+type staticNonceSource string
+
+func (sns staticNonceSource) Nonce() (string, error) {
+	return string(sns), nil
+}
+
+func RoundtripJWS(sigAlg SignatureAlgorithm, serializer func(*JsonWebSignature) (string, error), corrupter func(*JsonWebSignature), signingKey interface{}, verificationKey interface{}, nonce string) error {
+	signer, err := NewSigner(sigAlg, signingKey)
+	if err != nil {
+		return fmt.Errorf("error on new signer: %s", err)
+	}
+
+	if nonce != "" {
+		signer.SetNonceSource(staticNonceSource(nonce))
+	}
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	obj, err := signer.Sign(input)
+	if err != nil {
+		return fmt.Errorf("error on sign: %s", err)
+	}
+
+	msg, err := serializer(obj)
+	if err != nil {
+		return fmt.Errorf("error on serialize: %s", err)
+	}
+
+	obj, err = ParseSigned(msg)
+	if err != nil {
+		return fmt.Errorf("error on parse: %s", err)
+	}
+
+	// (Maybe) mangle the object
+	corrupter(obj)
+
+	output, err := obj.Verify(verificationKey)
+	if err != nil {
+		return fmt.Errorf("error on verify: %s", err)
+	}
+
+	// Check that verify works with embedded keys (if present)
+	for i, sig := range obj.Signatures {
+		if sig.Header.JsonWebKey != nil {
+			_, err = obj.Verify(sig.Header.JsonWebKey)
+			if err != nil {
+				return fmt.Errorf("error on verify with embedded key %d: %s", i, err)
+			}
+		}
+
+		// Check that the nonce correctly round-tripped (if present)
+		if sig.Header.Nonce != nonce {
+			return fmt.Errorf("Incorrect nonce returned: [%s]", sig.Header.Nonce)
+		}
+	}
+
+	if bytes.Compare(output, input) != 0 {
+		return fmt.Errorf("input/output do not match, got '%s', expected '%s'", output, input)
+	}
+
+	return nil
+}
+
+func TestRoundtripsJWS(t *testing.T) {
+	// Test matrix
+	sigAlgs := []SignatureAlgorithm{RS256, RS384, RS512, PS256, PS384, PS512, HS256, HS384, HS512, ES256, ES384, ES512}
+
+	serializers := []func(*JsonWebSignature) (string, error){
+		func(obj *JsonWebSignature) (string, error) { return obj.CompactSerialize() },
+		func(obj *JsonWebSignature) (string, error) { return obj.FullSerialize(), nil },
+	}
+
+	corrupter := func(obj *JsonWebSignature) {}
+
+	for _, alg := range sigAlgs {
+		signingKey, verificationKey := GenerateSigningTestKey(alg)
+
+		for i, serializer := range serializers {
+			err := RoundtripJWS(alg, serializer, corrupter, signingKey, verificationKey, "test_nonce")
+			if err != nil {
+				t.Error(err, alg, i)
+			}
+		}
+	}
+}
+
+func TestRoundtripsJWSCorruptSignature(t *testing.T) {
+	// Test matrix
+	sigAlgs := []SignatureAlgorithm{RS256, RS384, RS512, PS256, PS384, PS512, HS256, HS384, HS512, ES256, ES384, ES512}
+
+	serializers := []func(*JsonWebSignature) (string, error){
+		func(obj *JsonWebSignature) (string, error) { return obj.CompactSerialize() },
+		func(obj *JsonWebSignature) (string, error) { return obj.FullSerialize(), nil },
+	}
+
+	corrupters := []func(*JsonWebSignature){
+		func(obj *JsonWebSignature) {
+			// Changes bytes in signature
+			obj.Signatures[0].Signature[10]++
+		},
+		func(obj *JsonWebSignature) {
+			// Set totally invalid signature
+			obj.Signatures[0].Signature = []byte("###")
+		},
+	}
+
+	// Test all different configurations
+	for _, alg := range sigAlgs {
+		signingKey, verificationKey := GenerateSigningTestKey(alg)
+
+		for i, serializer := range serializers {
+			for j, corrupter := range corrupters {
+				err := RoundtripJWS(alg, serializer, corrupter, signingKey, verificationKey, "test_nonce")
+				if err == nil {
+					t.Error("failed to detect corrupt signature", err, alg, i, j)
+				}
+			}
+		}
+	}
+}
+
+func TestSignerWithBrokenRand(t *testing.T) {
+	sigAlgs := []SignatureAlgorithm{RS256, RS384, RS512, PS256, PS384, PS512}
+
+	serializer := func(obj *JsonWebSignature) (string, error) { return obj.CompactSerialize() }
+	corrupter := func(obj *JsonWebSignature) {}
+
+	// Break rand reader
+	readers := []func() io.Reader{
+		// Totally broken
+		func() io.Reader { return bytes.NewReader([]byte{}) },
+		// Not enough bytes
+		func() io.Reader { return io.LimitReader(rand.Reader, 20) },
+	}
+
+	defer resetRandReader()
+
+	for _, alg := range sigAlgs {
+		signingKey, verificationKey := GenerateSigningTestKey(alg)
+		for i, getReader := range readers {
+			randReader = getReader()
+			err := RoundtripJWS(alg, serializer, corrupter, signingKey, verificationKey, "test_nonce")
+			if err == nil {
+				t.Error("signer should fail if rand is broken", alg, i)
+			}
+		}
+	}
+}
+
+func TestJWSInvalidKey(t *testing.T) {
+	signingKey0, verificationKey0 := GenerateSigningTestKey(RS256)
+	_, verificationKey1 := GenerateSigningTestKey(ES256)
+
+	signer, err := NewSigner(RS256, signingKey0)
+	if err != nil {
+		panic(err)
+	}
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	obj, err := signer.Sign(input)
+	if err != nil {
+		panic(err)
+	}
+
+	// Must work with correct key
+	_, err = obj.Verify(verificationKey0)
+	if err != nil {
+		t.Error("error on verify", err)
+	}
+
+	// Must not work with incorrect key
+	_, err = obj.Verify(verificationKey1)
+	if err == nil {
+		t.Error("verification should fail with incorrect key")
+	}
+
+	// Must not work with invalid key
+	_, err = obj.Verify("")
+	if err == nil {
+		t.Error("verification should fail with incorrect key")
+	}
+}
+
+func TestMultiRecipientJWS(t *testing.T) {
+	signer := NewMultiSigner()
+
+	sharedKey := []byte{
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+	}
+
+	signer.AddRecipient(RS256, rsaTestKey)
+	signer.AddRecipient(HS384, sharedKey)
+
+	input := []byte("Lorem ipsum dolor sit amet")
+	obj, err := signer.Sign(input)
+	if err != nil {
+		t.Error("error on sign: ", err)
+		return
+	}
+
+	_, err = obj.CompactSerialize()
+	if err == nil {
+		t.Error("message with multiple recipient was compact serialized")
+	}
+
+	msg := obj.FullSerialize()
+
+	obj, err = ParseSigned(msg)
+	if err != nil {
+		t.Error("error on parse: ", err)
+		return
+	}
+
+	output, err := obj.Verify(&rsaTestKey.PublicKey)
+	if err != nil {
+		t.Error("error on verify: ", err)
+		return
+	}
+
+	if bytes.Compare(output, input) != 0 {
+		t.Error("input/output do not match", output, input)
+		return
+	}
+
+	output, err = obj.Verify(sharedKey)
+	if err != nil {
+		t.Error("error on verify: ", err)
+		return
+	}
+
+	if bytes.Compare(output, input) != 0 {
+		t.Error("input/output do not match", output, input)
+		return
+	}
+}
+
+func GenerateSigningTestKey(sigAlg SignatureAlgorithm) (sig, ver interface{}) {
+	switch sigAlg {
+	case RS256, RS384, RS512, PS256, PS384, PS512:
+		sig = rsaTestKey
+		ver = &rsaTestKey.PublicKey
+	case HS256, HS384, HS512:
+		sig, _, _ = randomKeyGenerator{size: 16}.genKey()
+		ver = sig
+	case ES256:
+		key, _ := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+		sig = key
+		ver = &key.PublicKey
+	case ES384:
+		key, _ := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+		sig = key
+		ver = &key.PublicKey
+	case ES512:
+		key, _ := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
+		sig = key
+		ver = &key.PublicKey
+	default:
+		panic("Must update test case")
+	}
+
+	return
+}
+
+func TestInvalidSignerAlg(t *testing.T) {
+	_, err := NewSigner("XYZ", nil)
+	if err == nil {
+		t.Error("should not accept invalid algorithm")
+	}
+
+	_, err = NewSigner("XYZ", []byte{})
+	if err == nil {
+		t.Error("should not accept invalid algorithm")
+	}
+}
+
+func TestInvalidJWS(t *testing.T) {
+	signer, err := NewSigner(PS256, rsaTestKey)
+	if err != nil {
+		panic(err)
+	}
+
+	obj, err := signer.Sign([]byte("Lorem ipsum dolor sit amet"))
+	obj.Signatures[0].header = &rawHeader{
+		Crit: []string{"TEST"},
+	}
+
+	_, err = obj.Verify(&rsaTestKey.PublicKey)
+	if err == nil {
+		t.Error("should not verify message with unknown crit header")
+	}
+
+	// Try without alg header
+	obj.Signatures[0].protected = &rawHeader{}
+	obj.Signatures[0].header = &rawHeader{}
+
+	_, err = obj.Verify(&rsaTestKey.PublicKey)
+	if err == nil {
+		t.Error("should not verify message with missing headers")
+	}
+}
+
+func TestSignerKid(t *testing.T) {
+	kid := "DEADBEEF"
+	payload := []byte("Lorem ipsum dolor sit amet")
+
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Error("problem generating test signing key", err)
+	}
+
+	basejwk := JsonWebKey{Key: key}
+	jsonbar, err := basejwk.MarshalJSON()
+	if err != nil {
+		t.Error("problem marshalling base JWK", err)
+	}
+
+	var jsonmsi map[string]interface{}
+	err = UnmarshalJSON(jsonbar, &jsonmsi)
+	if err != nil {
+		t.Error("problem unmarshalling base JWK", err)
+	}
+	jsonmsi["kid"] = kid
+	jsonbar2, err := MarshalJSON(jsonmsi)
+	if err != nil {
+		t.Error("problem marshalling kided JWK", err)
+	}
+
+	var jwk JsonWebKey
+	err = jwk.UnmarshalJSON(jsonbar2)
+	if err != nil {
+		t.Error("problem unmarshalling kided JWK", err)
+	}
+
+	signer, err := NewSigner(ES256, &jwk)
+	if err != nil {
+		t.Error("problem creating signer", err)
+	}
+	signed, err := signer.Sign(payload)
+
+	serialized := signed.FullSerialize()
+
+	parsed, err := ParseSigned(serialized)
+	if err != nil {
+		t.Error("problem parsing signed object", err)
+	}
+
+	if parsed.Signatures[0].Header.KeyID != kid {
+		t.Error("KeyID did not survive trip")
+	}
+}
+
+func TestEmbedJwk(t *testing.T) {
+	var payload = []byte("Lorem ipsum dolor sit amet")
+	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		t.Error("Failed to generate key")
+	}
+
+	signer, err := NewSigner(ES256, key)
+	if err != nil {
+		t.Error("Failed to create signer")
+	}
+
+	object, err := signer.Sign(payload)
+	if err != nil {
+		t.Error("Failed to sign payload")
+	}
+
+	object, err = ParseSigned(object.FullSerialize())
+	if err != nil {
+		t.Error("Failed to parse jws")
+	}
+
+	if object.Signatures[0].protected.Jwk == nil {
+		t.Error("JWK isn't set in protected header")
+	}
+
+	// Now sign it again, but don't embed JWK.
+	signer.SetEmbedJwk(false)
+
+	object, err = signer.Sign(payload)
+	if err != nil {
+		t.Error("Failed to sign payload")
+	}
+
+	object, err = ParseSigned(object.FullSerialize())
+	if err != nil {
+		t.Error("Failed to parse jws")
+	}
+
+	if object.Signatures[0].protected.Jwk != nil {
+		t.Error("JWK is set in protected header")
+	}
+}
+
+func TestSignerWithJWKAndKeyID(t *testing.T) {
+	enc, err := NewSigner(HS256, &JsonWebKey{
+		KeyID: "test-id",
+		Key:   []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+	})
+	if err != nil {
+		t.Error(err)
+	}
+
+	signed, _ := enc.Sign([]byte("Lorem ipsum dolor sit amet"))
+
+	serialized1, _ := signed.CompactSerialize()
+	serialized2 := signed.FullSerialize()
+
+	parsed1, _ := ParseSigned(serialized1)
+	parsed2, _ := ParseSigned(serialized2)
+
+	if parsed1.Signatures[0].Header.KeyID != "test-id" {
+		t.Errorf("expected message to have key id from JWK, but found '%s' instead", parsed1.Signatures[0].Header.KeyID)
+	}
+	if parsed2.Signatures[0].Header.KeyID != "test-id" {
+		t.Errorf("expected message to have key id from JWK, but found '%s' instead", parsed2.Signatures[0].Header.KeyID)
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/symmetric.go

@@ -0,0 +1,349 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/sha512"
+	"crypto/subtle"
+	"errors"
+	"hash"
+	"io"
+
+	"gopkg.in/square/go-jose.v1/cipher"
+)
+
+// Random reader (stubbed out in tests)
+var randReader = rand.Reader
+
+// Dummy key cipher for shared symmetric key mode
+type symmetricKeyCipher struct {
+	key []byte // Pre-shared content-encryption key
+}
+
+// Signer/verifier for MAC modes
+type symmetricMac struct {
+	key []byte
+}
+
+// Input/output from an AEAD operation
+type aeadParts struct {
+	iv, ciphertext, tag []byte
+}
+
+// A content cipher based on an AEAD construction
+type aeadContentCipher struct {
+	keyBytes     int
+	authtagBytes int
+	getAead      func(key []byte) (cipher.AEAD, error)
+}
+
+// Random key generator
+type randomKeyGenerator struct {
+	size int
+}
+
+// Static key generator
+type staticKeyGenerator struct {
+	key []byte
+}
+
+// Create a new content cipher based on AES-GCM
+func newAESGCM(keySize int) contentCipher {
+	return &aeadContentCipher{
+		keyBytes:     keySize,
+		authtagBytes: 16,
+		getAead: func(key []byte) (cipher.AEAD, error) {
+			aes, err := aes.NewCipher(key)
+			if err != nil {
+				return nil, err
+			}
+
+			return cipher.NewGCM(aes)
+		},
+	}
+}
+
+// Create a new content cipher based on AES-CBC+HMAC
+func newAESCBC(keySize int) contentCipher {
+	return &aeadContentCipher{
+		keyBytes:     keySize * 2,
+		authtagBytes: 16,
+		getAead: func(key []byte) (cipher.AEAD, error) {
+			return josecipher.NewCBCHMAC(key, aes.NewCipher)
+		},
+	}
+}
+
+// Get an AEAD cipher object for the given content encryption algorithm
+func getContentCipher(alg ContentEncryption) contentCipher {
+	switch alg {
+	case A128GCM:
+		return newAESGCM(16)
+	case A192GCM:
+		return newAESGCM(24)
+	case A256GCM:
+		return newAESGCM(32)
+	case A128CBC_HS256:
+		return newAESCBC(16)
+	case A192CBC_HS384:
+		return newAESCBC(24)
+	case A256CBC_HS512:
+		return newAESCBC(32)
+	default:
+		return nil
+	}
+}
+
+// newSymmetricRecipient creates a JWE encrypter based on AES-GCM key wrap.
+func newSymmetricRecipient(keyAlg KeyAlgorithm, key []byte) (recipientKeyInfo, error) {
+	switch keyAlg {
+	case DIRECT, A128GCMKW, A192GCMKW, A256GCMKW, A128KW, A192KW, A256KW:
+	default:
+		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientKeyInfo{
+		keyAlg: keyAlg,
+		keyEncrypter: &symmetricKeyCipher{
+			key: key,
+		},
+	}, nil
+}
+
+// newSymmetricSigner creates a recipientSigInfo based on the given key.
+func newSymmetricSigner(sigAlg SignatureAlgorithm, key []byte) (recipientSigInfo, error) {
+	// Verify that key management algorithm is supported by this encrypter
+	switch sigAlg {
+	case HS256, HS384, HS512:
+	default:
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		signer: &symmetricMac{
+			key: key,
+		},
+	}, nil
+}
+
+// Generate a random key for the given content cipher
+func (ctx randomKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	key := make([]byte, ctx.size)
+	_, err := io.ReadFull(randReader, key)
+	if err != nil {
+		return nil, rawHeader{}, err
+	}
+
+	return key, rawHeader{}, nil
+}
+
+// Key size for random generator
+func (ctx randomKeyGenerator) keySize() int {
+	return ctx.size
+}
+
+// Generate a static key (for direct mode)
+func (ctx staticKeyGenerator) genKey() ([]byte, rawHeader, error) {
+	cek := make([]byte, len(ctx.key))
+	copy(cek, ctx.key)
+	return cek, rawHeader{}, nil
+}
+
+// Key size for static generator
+func (ctx staticKeyGenerator) keySize() int {
+	return len(ctx.key)
+}
+
+// Get key size for this cipher
+func (ctx aeadContentCipher) keySize() int {
+	return ctx.keyBytes
+}
+
+// Encrypt some data
+func (ctx aeadContentCipher) encrypt(key, aad, pt []byte) (*aeadParts, error) {
+	// Get a new AEAD instance
+	aead, err := ctx.getAead(key)
+	if err != nil {
+		return nil, err
+	}
+
+	// Initialize a new nonce
+	iv := make([]byte, aead.NonceSize())
+	_, err = io.ReadFull(randReader, iv)
+	if err != nil {
+		return nil, err
+	}
+
+	ciphertextAndTag := aead.Seal(nil, iv, pt, aad)
+	offset := len(ciphertextAndTag) - ctx.authtagBytes
+
+	return &aeadParts{
+		iv:         iv,
+		ciphertext: ciphertextAndTag[:offset],
+		tag:        ciphertextAndTag[offset:],
+	}, nil
+}
+
+// Decrypt some data
+func (ctx aeadContentCipher) decrypt(key, aad []byte, parts *aeadParts) ([]byte, error) {
+	aead, err := ctx.getAead(key)
+	if err != nil {
+		return nil, err
+	}
+
+	return aead.Open(nil, parts.iv, append(parts.ciphertext, parts.tag...), aad)
+}
+
+// Encrypt the content encryption key.
+func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipientInfo, error) {
+	switch alg {
+	case DIRECT:
+		return recipientInfo{
+			header: &rawHeader{},
+		}, nil
+	case A128GCMKW, A192GCMKW, A256GCMKW:
+		aead := newAESGCM(len(ctx.key))
+
+		parts, err := aead.encrypt(ctx.key, []byte{}, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		return recipientInfo{
+			header: &rawHeader{
+				Iv:  newBuffer(parts.iv),
+				Tag: newBuffer(parts.tag),
+			},
+			encryptedKey: parts.ciphertext,
+		}, nil
+	case A128KW, A192KW, A256KW:
+		block, err := aes.NewCipher(ctx.key)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		jek, err := josecipher.KeyWrap(block, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		return recipientInfo{
+			encryptedKey: jek,
+			header:       &rawHeader{},
+		}, nil
+	}
+
+	return recipientInfo{}, ErrUnsupportedAlgorithm
+}
+
+// Decrypt the content encryption key.
+func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
+	switch KeyAlgorithm(headers.Alg) {
+	case DIRECT:
+		cek := make([]byte, len(ctx.key))
+		copy(cek, ctx.key)
+		return cek, nil
+	case A128GCMKW, A192GCMKW, A256GCMKW:
+		aead := newAESGCM(len(ctx.key))
+
+		parts := &aeadParts{
+			iv:         headers.Iv.bytes(),
+			ciphertext: recipient.encryptedKey,
+			tag:        headers.Tag.bytes(),
+		}
+
+		cek, err := aead.decrypt(ctx.key, []byte{}, parts)
+		if err != nil {
+			return nil, err
+		}
+
+		return cek, nil
+	case A128KW, A192KW, A256KW:
+		block, err := aes.NewCipher(ctx.key)
+		if err != nil {
+			return nil, err
+		}
+
+		cek, err := josecipher.KeyUnwrap(block, recipient.encryptedKey)
+		if err != nil {
+			return nil, err
+		}
+		return cek, nil
+	}
+
+	return nil, ErrUnsupportedAlgorithm
+}
+
+// Sign the given payload
+func (ctx symmetricMac) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	mac, err := ctx.hmac(payload, alg)
+	if err != nil {
+		return Signature{}, errors.New("square/go-jose: failed to compute hmac")
+	}
+
+	return Signature{
+		Signature: mac,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// Verify the given payload
+func (ctx symmetricMac) verifyPayload(payload []byte, mac []byte, alg SignatureAlgorithm) error {
+	expected, err := ctx.hmac(payload, alg)
+	if err != nil {
+		return errors.New("square/go-jose: failed to compute hmac")
+	}
+
+	if len(mac) != len(expected) {
+		return errors.New("square/go-jose: invalid hmac")
+	}
+
+	match := subtle.ConstantTimeCompare(mac, expected)
+	if match != 1 {
+		return errors.New("square/go-jose: invalid hmac")
+	}
+
+	return nil
+}
+
+// Compute the HMAC based on the given alg value
+func (ctx symmetricMac) hmac(payload []byte, alg SignatureAlgorithm) ([]byte, error) {
+	var hash func() hash.Hash
+
+	switch alg {
+	case HS256:
+		hash = sha256.New
+	case HS384:
+		hash = sha512.New384
+	case HS512:
+		hash = sha512.New
+	default:
+		return nil, ErrUnsupportedAlgorithm
+	}
+
+	hmac := hmac.New(hash, ctx.key)
+
+	// According to documentation, Write() on hash never fails
+	_, _ = hmac.Write(payload)
+	return hmac.Sum(nil), nil
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/symmetric_test.go

@@ -0,0 +1,131 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/rand"
+	"io"
+	"testing"
+)
+
+func TestInvalidSymmetricAlgorithms(t *testing.T) {
+	_, err := newSymmetricRecipient("XYZ", []byte{})
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should not accept invalid algorithm")
+	}
+
+	enc := &symmetricKeyCipher{}
+	_, err = enc.encryptKey([]byte{}, "XYZ")
+	if err != ErrUnsupportedAlgorithm {
+		t.Error("should not accept invalid algorithm")
+	}
+}
+
+func TestAeadErrors(t *testing.T) {
+	aead := &aeadContentCipher{
+		keyBytes:     16,
+		authtagBytes: 16,
+		getAead: func(key []byte) (cipher.AEAD, error) {
+			return nil, ErrCryptoFailure
+		},
+	}
+
+	parts, err := aead.encrypt([]byte{}, []byte{}, []byte{})
+	if err != ErrCryptoFailure {
+		t.Error("should handle aead failure")
+	}
+
+	_, err = aead.decrypt([]byte{}, []byte{}, parts)
+	if err != ErrCryptoFailure {
+		t.Error("should handle aead failure")
+	}
+}
+
+func TestInvalidKey(t *testing.T) {
+	gcm := newAESGCM(16).(*aeadContentCipher)
+	_, err := gcm.getAead([]byte{})
+	if err == nil {
+		t.Error("should not accept invalid key")
+	}
+}
+
+func TestStaticKeyGen(t *testing.T) {
+	key := make([]byte, 32)
+	io.ReadFull(rand.Reader, key)
+
+	gen := &staticKeyGenerator{key: key}
+	if gen.keySize() != len(key) {
+		t.Error("static key generator reports incorrect size")
+	}
+
+	generated, _, err := gen.genKey()
+	if err != nil {
+		t.Error("static key generator should always succeed", err)
+	}
+	if !bytes.Equal(generated, key) {
+		t.Error("static key generator returns different data")
+	}
+}
+
+func TestVectorsAESGCM(t *testing.T) {
+	// Source: http://tools.ietf.org/html/draft-ietf-jose-json-web-encryption-29#appendix-A.1
+	plaintext := []byte{
+		84, 104, 101, 32, 116, 114, 117, 101, 32, 115, 105, 103, 110, 32,
+		111, 102, 32, 105, 110, 116, 101, 108, 108, 105, 103, 101, 110, 99,
+		101, 32, 105, 115, 32, 110, 111, 116, 32, 107, 110, 111, 119, 108,
+		101, 100, 103, 101, 32, 98, 117, 116, 32, 105, 109, 97, 103, 105,
+		110, 97, 116, 105, 111, 110, 46}
+
+	aad := []byte{
+		101, 121, 74, 104, 98, 71, 99, 105, 79, 105, 74, 83, 85, 48, 69,
+		116, 84, 48, 70, 70, 85, 67, 73, 115, 73, 109, 86, 117, 89, 121, 73,
+		54, 73, 107, 69, 121, 78, 84, 90, 72, 81, 48, 48, 105, 102, 81}
+
+	expectedCiphertext := []byte{
+		229, 236, 166, 241, 53, 191, 115, 196, 174, 43, 73, 109, 39, 122,
+		233, 96, 140, 206, 120, 52, 51, 237, 48, 11, 190, 219, 186, 80, 111,
+		104, 50, 142, 47, 167, 59, 61, 181, 127, 196, 21, 40, 82, 242, 32,
+		123, 143, 168, 226, 73, 216, 176, 144, 138, 247, 106, 60, 16, 205,
+		160, 109, 64, 63, 192}
+
+	expectedAuthtag := []byte{
+		92, 80, 104, 49, 133, 25, 161, 215, 173, 101, 219, 211, 136, 91, 210, 145}
+
+	// Mock random reader
+	randReader = bytes.NewReader([]byte{
+		177, 161, 244, 128, 84, 143, 225, 115, 63, 180, 3, 255, 107, 154,
+		212, 246, 138, 7, 110, 91, 112, 46, 34, 105, 47, 130, 203, 46, 122,
+		234, 64, 252, 227, 197, 117, 252, 2, 219, 233, 68, 180, 225, 77, 219})
+	defer resetRandReader()
+
+	enc := newAESGCM(32)
+	key, _, _ := randomKeyGenerator{size: 32}.genKey()
+	out, err := enc.encrypt(key, aad, plaintext)
+	if err != nil {
+		t.Error("Unable to encrypt:", err)
+		return
+	}
+
+	if bytes.Compare(out.ciphertext, expectedCiphertext) != 0 {
+		t.Error("Ciphertext did not match")
+	}
+	if bytes.Compare(out.tag, expectedAuthtag) != 0 {
+		t.Error("Auth tag did not match")
+	}
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/utils.go

@@ -0,0 +1,74 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+)
+
+// LoadPublicKey loads a public key from PEM/DER-encoded data.
+func LoadPublicKey(data []byte) (interface{}, error) {
+	input := data
+
+	block, _ := pem.Decode(data)
+	if block != nil {
+		input = block.Bytes
+	}
+
+	// Try to load SubjectPublicKeyInfo
+	pub, err0 := x509.ParsePKIXPublicKey(input)
+	if err0 == nil {
+		return pub, nil
+	}
+
+	cert, err1 := x509.ParseCertificate(input)
+	if err1 == nil {
+		return cert.PublicKey, nil
+	}
+
+	return nil, fmt.Errorf("square/go-jose: parse error, got '%s' and '%s'", err0, err1)
+}
+
+// LoadPrivateKey loads a private key from PEM/DER-encoded data.
+func LoadPrivateKey(data []byte) (interface{}, error) {
+	input := data
+
+	block, _ := pem.Decode(data)
+	if block != nil {
+		input = block.Bytes
+	}
+
+	var priv interface{}
+	priv, err0 := x509.ParsePKCS1PrivateKey(input)
+	if err0 == nil {
+		return priv, nil
+	}
+
+	priv, err1 := x509.ParsePKCS8PrivateKey(input)
+	if err1 == nil {
+		return priv, nil
+	}
+
+	priv, err2 := x509.ParseECPrivateKey(input)
+	if err2 == nil {
+		return priv, nil
+	}
+
+	return nil, fmt.Errorf("square/go-jose: parse error, got '%s', '%s' and '%s'", err0, err1, err2)
+}

vendor/rsc.io/letsencrypt/vendor/gopkg.in/square/go-jose.v1/utils_test.go

@@ -0,0 +1,225 @@
+/*-
+ * Copyright 2014 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+import (
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/rsa"
+	"encoding/base64"
+	"encoding/hex"
+	"math/big"
+	"regexp"
+	"testing"
+)
+
+// Reset random reader to original value
+func resetRandReader() {
+	randReader = rand.Reader
+}
+
+// Build big int from hex-encoded string. Strips whitespace (for testing).
+func fromHexInt(base16 string) *big.Int {
+	re := regexp.MustCompile(`\s+`)
+	val, ok := new(big.Int).SetString(re.ReplaceAllString(base16, ""), 16)
+	if !ok {
+		panic("Invalid test data")
+	}
+	return val
+}
+
+// Build big int from base64-encoded string. Strips whitespace (for testing).
+func fromBase64Int(base64 string) *big.Int {
+	re := regexp.MustCompile(`\s+`)
+	val, err := base64URLDecode(re.ReplaceAllString(base64, ""))
+	if err != nil {
+		panic("Invalid test data")
+	}
+	return new(big.Int).SetBytes(val)
+}
+
+// Decode hex-encoded string into byte array. Strips whitespace (for testing).
+func fromHexBytes(base16 string) []byte {
+	re := regexp.MustCompile(`\s+`)
+	val, err := hex.DecodeString(re.ReplaceAllString(base16, ""))
+	if err != nil {
+		panic("Invalid test data")
+	}
+	return val
+}
+
+// Decode base64-encoded string into byte array. Strips whitespace (for testing).
+func fromBase64Bytes(b64 string) []byte {
+	re := regexp.MustCompile(`\s+`)
+	val, err := base64.StdEncoding.DecodeString(re.ReplaceAllString(b64, ""))
+	if err != nil {
+		panic("Invalid test data")
+	}
+	return val
+}
+
+// Test vectors below taken from crypto/x509/x509_test.go in the Go std lib.
+
+var pkixPublicKey = `-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3VoPN9PKUjKFLMwOge6+
+wnDi8sbETGIx2FKXGgqtAKpzmem53kRGEQg8WeqRmp12wgp74TGpkEXsGae7RS1k
+enJCnma4fii+noGH7R0qKgHvPrI2Bwa9hzsH8tHxpyM3qrXslOmD45EH9SxIDUBJ
+FehNdaPbLP1gFyahKMsdfxFJLUvbUycuZSJ2ZnIgeVxwm4qbSvZInL9Iu4FzuPtg
+fINKcbbovy1qq4KvPIrXzhbY3PWDc6btxCf3SE0JdE1MCPThntB62/bLMSQ7xdDR
+FF53oIpvxe/SCOymfWq/LW849Ytv3Xwod0+wzAP8STXG4HSELS4UedPYeHJJJYcZ
++QIDAQAB
+-----END PUBLIC KEY-----`
+
+var pkcs1PrivateKey = `-----BEGIN RSA PRIVATE KEY-----
+MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
+fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
+/ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
+RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
+EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
+IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
+tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
+-----END RSA PRIVATE KEY-----`
+
+var ecdsaSHA256p384CertPem = `
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----`
+
+var ecdsaSHA256p384CertDer = fromBase64Bytes(`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`)
+
+var pkcs8ECPrivateKey = `
+-----BEGIN PRIVATE KEY-----
+MIHtAgEAMBAGByqGSM49AgEGBSuBBAAjBIHVMIHSAgEBBEHqkl65VsjYDQWIHfgv
+zQLPa0JZBsaJI16mjiH8k6VA4lgfK/KNldlEsY433X7wIzo43u8OpX7Nv7n8pVRH
+15XWK6GBiQOBhgAEAfDuikMI4bWsyse7t8iSCmjt9fneW/qStZuIPuVLo7mSJdud
+Cs3J/x9wOnnhLv1u+0atnq5HKKdL4ff3itJPlhmSAQzByKQ5LTvB7d6fn95GJVK/
+hNuS5qGBpB7qeMXVFoki0/2RZIOway8/fXjmNYwe4v/XB5LLn4hcTvEUGYcF8M9K
+-----END PRIVATE KEY-----`
+
+var ecPrivateKey = `
+-----BEGIN EC PRIVATE KEY-----
+MIHcAgEBBEIBv2rdY9mWGD/UgiuXB0LJcUzgaB6TXq/Ra1jrZKBV3IGSacM5QDFu
+N8yrywiQaTDEqn1zVcLwrnqoQux3gWN1jxugBwYFK4EEACOhgYkDgYYABAFJgaM/
+2a3+gE6Khm/1PYftqNwAzQ21HSLp27q2lTN+GBFho691ARFRkr9UzlQ8gRnhkTbu
+yGfASamlHsYlr3Tv+gFc4BY8SU0q8kzpQ0dOHWFk7dfGFmKwhJrSFIIOeRn/LY03
+XsVFctNDsGhobS2JguQrxhGx8Ll7vQCakV/PEmCQJA==
+-----END EC PRIVATE KEY-----`
+
+var ecPrivateKeyDer = fromBase64Bytes(`
+MIHcAgEBBEIBv2rdY9mWGD/UgiuXB0LJcUzgaB6TXq/Ra1jrZKBV3IGSacM5QDFu
+N8yrywiQaTDEqn1zVcLwrnqoQux3gWN1jxugBwYFK4EEACOhgYkDgYYABAFJgaM/
+2a3+gE6Khm/1PYftqNwAzQ21HSLp27q2lTN+GBFho691ARFRkr9UzlQ8gRnhkTbu
+yGfASamlHsYlr3Tv+gFc4BY8SU0q8kzpQ0dOHWFk7dfGFmKwhJrSFIIOeRn/LY03
+XsVFctNDsGhobS2JguQrxhGx8Ll7vQCakV/PEmCQJA==`)
+
+var invalidPemKey = `
+-----BEGIN PUBLIC KEY-----
+MIHcAgEBBEIBv2rdY9mWGD/UgiuXB0LJcUzgaB6TXq/Ra1jrZKBV3IGSacM5QDFu
+XsVFctNDsGhobS2JguQrxhGx8Ll7vQCakV/PEmCQJA==
+-----END PUBLIC KEY-----`
+
+func TestLoadPublicKey(t *testing.T) {
+	pub, err := LoadPublicKey([]byte(pkixPublicKey))
+	switch pub.(type) {
+	case *rsa.PublicKey:
+	default:
+		t.Error("failed to parse RSA PKIX public key:", err)
+	}
+
+	pub, err = LoadPublicKey([]byte(ecdsaSHA256p384CertPem))
+	switch pub.(type) {
+	case *ecdsa.PublicKey:
+	default:
+		t.Error("failed to parse ECDSA X.509 cert:", err)
+	}
+
+	pub, err = LoadPublicKey([]byte(ecdsaSHA256p384CertDer))
+	switch pub.(type) {
+	case *ecdsa.PublicKey:
+	default:
+		t.Error("failed to parse ECDSA X.509 cert:", err)
+	}
+
+	pub, err = LoadPublicKey([]byte("###"))
+	if err == nil {
+		t.Error("should not parse invalid key")
+	}
+
+	pub, err = LoadPublicKey([]byte(invalidPemKey))
+	if err == nil {
+		t.Error("should not parse invalid key")
+	}
+}
+
+func TestLoadPrivateKey(t *testing.T) {
+	priv, err := LoadPrivateKey([]byte(pkcs1PrivateKey))
+	switch priv.(type) {
+	case *rsa.PrivateKey:
+	default:
+		t.Error("failed to parse RSA PKCS1 private key:", err)
+	}
+
+	priv, err = LoadPrivateKey([]byte(pkcs8ECPrivateKey))
+	if _, ok := priv.(*ecdsa.PrivateKey); !ok {
+		t.Error("failed to parse EC PKCS8 private key:", err)
+	}
+
+	priv, err = LoadPrivateKey([]byte(ecPrivateKey))
+	if _, ok := priv.(*ecdsa.PrivateKey); !ok {
+		t.Error("failed to parse EC private key:", err)
+	}
+
+	priv, err = LoadPrivateKey([]byte(ecPrivateKeyDer))
+	if _, ok := priv.(*ecdsa.PrivateKey); !ok {
+		t.Error("failed to parse EC private key:", err)
+	}
+
+	priv, err = LoadPrivateKey([]byte("###"))
+	if err == nil {
+		t.Error("should not parse invalid key")
+	}
+
+	priv, err = LoadPrivateKey([]byte(invalidPemKey))
+	if err == nil {
+		t.Error("should not parse invalid key")
+	}
+}

vendor/rsc.io/letsencrypt/vendor/vendor.json

@@ -0,0 +1,31 @@
+{
+	"comment": "",
+	"ignore": "",
+	"package": [
+		{
+			"checksumSHA1": "CHmdoMriAboKW2nHYSXo0yBizaE=",
+			"path": "github.com/xenolf/lego/acme",
+			"revision": "ca19a90028e242e878585941c2a27c8f3b3efc25",
+			"revisionTime": "2016-03-28T16:28:34Z"
+		},
+		{
+			"checksumSHA1": "jrheBzltbBE1frmNXQiu911T7dE=",
+			"path": "gopkg.in/square/go-jose.v1",
+			"revision": "40d457b439244b546f023d056628e5184136899b",
+			"revisionTime": "2016-03-29T20:33:11Z"
+		},
+		{
+			"checksumSHA1": "fX4KSC9E1oX9yRx20Zjb3rVJHn4=",
+			"path": "gopkg.in/square/go-jose.v1/cipher",
+			"revision": "40d457b439244b546f023d056628e5184136899b",
+			"revisionTime": "2016-03-29T20:33:11Z"
+		},
+		{
+			"checksumSHA1": "NxdXsIcLGuuX654ygsaOhoLsg6s=",
+			"path": "gopkg.in/square/go-jose.v1/json",
+			"revision": "40d457b439244b546f023d056628e5184136899b",
+			"revisionTime": "2016-03-29T20:33:11Z"
+		}
+	],
+	"rootPath": "rsc.io/letsencrypt"
+}