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