427 lines
13 KiB
Go
427 lines
13 KiB
Go
package libtrust
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/json"
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"encoding/pem"
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"errors"
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"fmt"
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"io"
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"math/big"
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)
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/*
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* RSA DSA PUBLIC KEY
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*/
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// rsaPublicKey implements a JWK Public Key using RSA digital signature algorithms.
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type rsaPublicKey struct {
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*rsa.PublicKey
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extended map[string]interface{}
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}
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func fromRSAPublicKey(cryptoPublicKey *rsa.PublicKey) *rsaPublicKey {
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return &rsaPublicKey{cryptoPublicKey, map[string]interface{}{}}
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}
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// KeyType returns the JWK key type for RSA keys, i.e., "RSA".
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func (k *rsaPublicKey) KeyType() string {
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return "RSA"
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}
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// KeyID returns a distinct identifier which is unique to this Public Key.
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func (k *rsaPublicKey) KeyID() string {
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return keyIDFromCryptoKey(k)
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}
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func (k *rsaPublicKey) String() string {
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return fmt.Sprintf("RSA Public Key <%s>", k.KeyID())
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}
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// Verify verifyies the signature of the data in the io.Reader using this Public Key.
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// The alg parameter should be the name of the JWA digital signature algorithm
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// which was used to produce the signature and should be supported by this
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// public key. Returns a nil error if the signature is valid.
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func (k *rsaPublicKey) Verify(data io.Reader, alg string, signature []byte) error {
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// Verify the signature of the given date, return non-nil error if valid.
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sigAlg, err := rsaSignatureAlgorithmByName(alg)
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if err != nil {
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return fmt.Errorf("unable to verify Signature: %s", err)
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}
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hasher := sigAlg.HashID().New()
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_, err = io.Copy(hasher, data)
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if err != nil {
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return fmt.Errorf("error reading data to sign: %s", err)
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}
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hash := hasher.Sum(nil)
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err = rsa.VerifyPKCS1v15(k.PublicKey, sigAlg.HashID(), hash, signature)
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if err != nil {
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return fmt.Errorf("invalid %s signature: %s", sigAlg.HeaderParam(), err)
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}
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return nil
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}
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// CryptoPublicKey returns the internal object which can be used as a
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// crypto.PublicKey for use with other standard library operations. The type
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// is either *rsa.PublicKey or *ecdsa.PublicKey
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func (k *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
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return k.PublicKey
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}
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func (k *rsaPublicKey) toMap() map[string]interface{} {
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jwk := make(map[string]interface{})
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for k, v := range k.extended {
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jwk[k] = v
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}
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jwk["kty"] = k.KeyType()
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jwk["kid"] = k.KeyID()
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jwk["n"] = joseBase64UrlEncode(k.N.Bytes())
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jwk["e"] = joseBase64UrlEncode(serializeRSAPublicExponentParam(k.E))
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return jwk
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}
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// MarshalJSON serializes this Public Key using the JWK JSON serialization format for
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// RSA keys.
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func (k *rsaPublicKey) MarshalJSON() (data []byte, err error) {
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return json.Marshal(k.toMap())
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}
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// PEMBlock serializes this Public Key to DER-encoded PKIX format.
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func (k *rsaPublicKey) PEMBlock() (*pem.Block, error) {
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derBytes, err := x509.MarshalPKIXPublicKey(k.PublicKey)
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if err != nil {
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return nil, fmt.Errorf("unable to serialize RSA PublicKey to DER-encoded PKIX format: %s", err)
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}
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k.extended["kid"] = k.KeyID() // For display purposes.
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return createPemBlock("PUBLIC KEY", derBytes, k.extended)
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}
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func (k *rsaPublicKey) AddExtendedField(field string, value interface{}) {
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k.extended[field] = value
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}
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func (k *rsaPublicKey) GetExtendedField(field string) interface{} {
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v, ok := k.extended[field]
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if !ok {
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return nil
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}
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return v
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}
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func rsaPublicKeyFromMap(jwk map[string]interface{}) (*rsaPublicKey, error) {
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// JWK key type (kty) has already been determined to be "RSA".
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// Need to extract 'n', 'e', and 'kid' and check for
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// consistency.
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// Get the modulus parameter N.
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nB64Url, err := stringFromMap(jwk, "n")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Public Key modulus: %s", err)
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}
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n, err := parseRSAModulusParam(nB64Url)
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Public Key modulus: %s", err)
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}
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// Get the public exponent E.
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eB64Url, err := stringFromMap(jwk, "e")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Public Key exponent: %s", err)
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}
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e, err := parseRSAPublicExponentParam(eB64Url)
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Public Key exponent: %s", err)
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}
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key := &rsaPublicKey{
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PublicKey: &rsa.PublicKey{N: n, E: e},
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}
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// Key ID is optional, but if it exists, it should match the key.
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_, ok := jwk["kid"]
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if ok {
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kid, err := stringFromMap(jwk, "kid")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Public Key ID: %s", err)
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}
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if kid != key.KeyID() {
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return nil, fmt.Errorf("JWK RSA Public Key ID does not match: %s", kid)
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}
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}
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if _, ok := jwk["d"]; ok {
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return nil, fmt.Errorf("JWK RSA Public Key cannot contain private exponent")
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}
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key.extended = jwk
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return key, nil
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}
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/*
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* RSA DSA PRIVATE KEY
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*/
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// rsaPrivateKey implements a JWK Private Key using RSA digital signature algorithms.
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type rsaPrivateKey struct {
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rsaPublicKey
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*rsa.PrivateKey
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}
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func fromRSAPrivateKey(cryptoPrivateKey *rsa.PrivateKey) *rsaPrivateKey {
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return &rsaPrivateKey{
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*fromRSAPublicKey(&cryptoPrivateKey.PublicKey),
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cryptoPrivateKey,
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}
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}
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// PublicKey returns the Public Key data associated with this Private Key.
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func (k *rsaPrivateKey) PublicKey() PublicKey {
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return &k.rsaPublicKey
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}
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func (k *rsaPrivateKey) String() string {
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return fmt.Sprintf("RSA Private Key <%s>", k.KeyID())
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}
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// Sign signs the data read from the io.Reader using a signature algorithm supported
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// by the RSA private key. If the specified hashing algorithm is supported by
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// this key, that hash function is used to generate the signature otherwise the
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// the default hashing algorithm for this key is used. Returns the signature
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// and the name of the JWK signature algorithm used, e.g., "RS256", "RS384",
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// "RS512".
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func (k *rsaPrivateKey) Sign(data io.Reader, hashID crypto.Hash) (signature []byte, alg string, err error) {
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// Generate a signature of the data using the internal alg.
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sigAlg := rsaPKCS1v15SignatureAlgorithmForHashID(hashID)
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hasher := sigAlg.HashID().New()
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_, err = io.Copy(hasher, data)
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if err != nil {
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return nil, "", fmt.Errorf("error reading data to sign: %s", err)
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}
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hash := hasher.Sum(nil)
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signature, err = rsa.SignPKCS1v15(rand.Reader, k.PrivateKey, sigAlg.HashID(), hash)
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if err != nil {
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return nil, "", fmt.Errorf("error producing signature: %s", err)
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}
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alg = sigAlg.HeaderParam()
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return
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}
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// CryptoPrivateKey returns the internal object which can be used as a
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// crypto.PublicKey for use with other standard library operations. The type
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// is either *rsa.PublicKey or *ecdsa.PublicKey
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func (k *rsaPrivateKey) CryptoPrivateKey() crypto.PrivateKey {
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return k.PrivateKey
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}
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func (k *rsaPrivateKey) toMap() map[string]interface{} {
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k.Precompute() // Make sure the precomputed values are stored.
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jwk := k.rsaPublicKey.toMap()
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jwk["d"] = joseBase64UrlEncode(k.D.Bytes())
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jwk["p"] = joseBase64UrlEncode(k.Primes[0].Bytes())
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jwk["q"] = joseBase64UrlEncode(k.Primes[1].Bytes())
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jwk["dp"] = joseBase64UrlEncode(k.Precomputed.Dp.Bytes())
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jwk["dq"] = joseBase64UrlEncode(k.Precomputed.Dq.Bytes())
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jwk["qi"] = joseBase64UrlEncode(k.Precomputed.Qinv.Bytes())
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otherPrimes := k.Primes[2:]
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if len(otherPrimes) > 0 {
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otherPrimesInfo := make([]interface{}, len(otherPrimes))
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for i, r := range otherPrimes {
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otherPrimeInfo := make(map[string]string, 3)
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otherPrimeInfo["r"] = joseBase64UrlEncode(r.Bytes())
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crtVal := k.Precomputed.CRTValues[i]
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otherPrimeInfo["d"] = joseBase64UrlEncode(crtVal.Exp.Bytes())
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otherPrimeInfo["t"] = joseBase64UrlEncode(crtVal.Coeff.Bytes())
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otherPrimesInfo[i] = otherPrimeInfo
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}
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jwk["oth"] = otherPrimesInfo
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}
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return jwk
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}
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// MarshalJSON serializes this Private Key using the JWK JSON serialization format for
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// RSA keys.
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func (k *rsaPrivateKey) MarshalJSON() (data []byte, err error) {
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return json.Marshal(k.toMap())
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}
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// PEMBlock serializes this Private Key to DER-encoded PKIX format.
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func (k *rsaPrivateKey) PEMBlock() (*pem.Block, error) {
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derBytes := x509.MarshalPKCS1PrivateKey(k.PrivateKey)
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k.extended["keyID"] = k.KeyID() // For display purposes.
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return createPemBlock("RSA PRIVATE KEY", derBytes, k.extended)
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}
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func rsaPrivateKeyFromMap(jwk map[string]interface{}) (*rsaPrivateKey, error) {
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// The JWA spec for RSA Private Keys (draft rfc section 5.3.2) states that
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// only the private key exponent 'd' is REQUIRED, the others are just for
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// signature/decryption optimizations and SHOULD be included when the JWK
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// is produced. We MAY choose to accept a JWK which only includes 'd', but
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// we're going to go ahead and not choose to accept it without the extra
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// fields. Only the 'oth' field will be optional (for multi-prime keys).
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privateExponent, err := parseRSAPrivateKeyParamFromMap(jwk, "d")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key exponent: %s", err)
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}
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firstPrimeFactor, err := parseRSAPrivateKeyParamFromMap(jwk, "p")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
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}
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secondPrimeFactor, err := parseRSAPrivateKeyParamFromMap(jwk, "q")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
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}
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firstFactorCRT, err := parseRSAPrivateKeyParamFromMap(jwk, "dp")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
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}
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secondFactorCRT, err := parseRSAPrivateKeyParamFromMap(jwk, "dq")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
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}
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crtCoeff, err := parseRSAPrivateKeyParamFromMap(jwk, "qi")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key CRT coefficient: %s", err)
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}
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var oth interface{}
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if _, ok := jwk["oth"]; ok {
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oth = jwk["oth"]
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delete(jwk, "oth")
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}
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// JWK key type (kty) has already been determined to be "RSA".
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// Need to extract the public key information, then extract the private
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// key values.
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publicKey, err := rsaPublicKeyFromMap(jwk)
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if err != nil {
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return nil, err
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}
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privateKey := &rsa.PrivateKey{
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PublicKey: *publicKey.PublicKey,
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D: privateExponent,
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Primes: []*big.Int{firstPrimeFactor, secondPrimeFactor},
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Precomputed: rsa.PrecomputedValues{
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Dp: firstFactorCRT,
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Dq: secondFactorCRT,
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Qinv: crtCoeff,
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},
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}
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if oth != nil {
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// Should be an array of more JSON objects.
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otherPrimesInfo, ok := oth.([]interface{})
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if !ok {
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return nil, errors.New("JWK RSA Private Key: Invalid other primes info: must be an array")
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}
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numOtherPrimeFactors := len(otherPrimesInfo)
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if numOtherPrimeFactors == 0 {
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return nil, errors.New("JWK RSA Privake Key: Invalid other primes info: must be absent or non-empty")
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}
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otherPrimeFactors := make([]*big.Int, numOtherPrimeFactors)
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productOfPrimes := new(big.Int).Mul(firstPrimeFactor, secondPrimeFactor)
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crtValues := make([]rsa.CRTValue, numOtherPrimeFactors)
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for i, val := range otherPrimesInfo {
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otherPrimeinfo, ok := val.(map[string]interface{})
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if !ok {
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return nil, errors.New("JWK RSA Private Key: Invalid other prime info: must be a JSON object")
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}
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otherPrimeFactor, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "r")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key prime factor: %s", err)
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}
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otherFactorCRT, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "d")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key CRT exponent: %s", err)
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}
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otherCrtCoeff, err := parseRSAPrivateKeyParamFromMap(otherPrimeinfo, "t")
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if err != nil {
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return nil, fmt.Errorf("JWK RSA Private Key CRT coefficient: %s", err)
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}
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crtValue := crtValues[i]
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crtValue.Exp = otherFactorCRT
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crtValue.Coeff = otherCrtCoeff
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crtValue.R = productOfPrimes
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otherPrimeFactors[i] = otherPrimeFactor
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productOfPrimes = new(big.Int).Mul(productOfPrimes, otherPrimeFactor)
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}
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privateKey.Primes = append(privateKey.Primes, otherPrimeFactors...)
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privateKey.Precomputed.CRTValues = crtValues
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}
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key := &rsaPrivateKey{
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rsaPublicKey: *publicKey,
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PrivateKey: privateKey,
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}
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return key, nil
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}
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/*
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* Key Generation Functions.
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*/
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func generateRSAPrivateKey(bits int) (k *rsaPrivateKey, err error) {
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k = new(rsaPrivateKey)
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k.PrivateKey, err = rsa.GenerateKey(rand.Reader, bits)
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if err != nil {
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return nil, err
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}
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k.rsaPublicKey.PublicKey = &k.PrivateKey.PublicKey
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k.extended = make(map[string]interface{})
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return
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}
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// GenerateRSA2048PrivateKey generates a key pair using 2048-bit RSA.
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func GenerateRSA2048PrivateKey() (PrivateKey, error) {
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k, err := generateRSAPrivateKey(2048)
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if err != nil {
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return nil, fmt.Errorf("error generating RSA 2048-bit key: %s", err)
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}
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return k, nil
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}
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// GenerateRSA3072PrivateKey generates a key pair using 3072-bit RSA.
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func GenerateRSA3072PrivateKey() (PrivateKey, error) {
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k, err := generateRSAPrivateKey(3072)
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if err != nil {
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return nil, fmt.Errorf("error generating RSA 3072-bit key: %s", err)
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}
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return k, nil
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}
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// GenerateRSA4096PrivateKey generates a key pair using 4096-bit RSA.
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func GenerateRSA4096PrivateKey() (PrivateKey, error) {
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k, err := generateRSAPrivateKey(4096)
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if err != nil {
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return nil, fmt.Errorf("error generating RSA 4096-bit key: %s", err)
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}
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return k, nil
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}
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