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/
jwt_support.go
194 lines (150 loc) · 4.48 KB
/
jwt_support.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package jwt
import (
"crypto"
"crypto/ed25519"
"crypto/rand"
"crypto/rsa"
"errors"
"github.com/hyperledger/aries-framework-go/pkg/doc/jose"
)
// JoseED25519Signer is a Jose compliant signer.
type JoseED25519Signer struct {
privKey []byte
headers map[string]interface{}
}
// Sign data.
func (s JoseED25519Signer) Sign(data []byte) ([]byte, error) {
return ed25519.Sign(s.privKey, data), nil
}
// Headers returns the signer's headers map.
func (s JoseED25519Signer) Headers() jose.Headers {
return s.headers
}
// NewEd25519Signer returns a Jose compliant signer that can be passed as a signer to jwt.NewSigned().
func NewEd25519Signer(privKey []byte) *JoseED25519Signer {
return &JoseED25519Signer{
privKey: privKey,
headers: prepareJWSHeaders(nil, signatureEdDSA),
}
}
// JoseEd25519Verifier is a Jose compliant verifier.
type JoseEd25519Verifier struct {
pubKey []byte
}
// Verify signingInput against signature. it validates that joseHeaders contains EdDSA alg for this implementation.
func (v JoseEd25519Verifier) Verify(joseHeaders jose.Headers, _, signingInput, signature []byte) error {
alg, ok := joseHeaders.Algorithm()
if !ok {
return errors.New("alg is not defined")
}
if alg != "EdDSA" {
return errors.New("alg is not EdDSA")
}
if ok := ed25519.Verify(v.pubKey, signingInput, signature); !ok {
return errors.New("signature doesn't match")
}
return nil
}
// NewEd25519Verifier returns a Jose compliant verifier that can be passed as a verifier option to jwt.Parse().
func NewEd25519Verifier(pubKey []byte) (*JoseEd25519Verifier, error) {
if l := len(pubKey); l != ed25519.PublicKeySize {
return nil, errors.New("bad ed25519 public key length")
}
return &JoseEd25519Verifier{pubKey: pubKey}, nil
}
// RS256Signer is a Jose complient signer.
type RS256Signer struct {
privKey *rsa.PrivateKey
headers map[string]interface{}
}
// NewRS256Signer returns a Jose compliant signer that can be passed as a signer to jwt.NewSigned().
func NewRS256Signer(privKey *rsa.PrivateKey, headers map[string]interface{}) *RS256Signer {
return &RS256Signer{
privKey: privKey,
headers: prepareJWSHeaders(headers, signatureRS256),
}
}
// Sign data.
func (s RS256Signer) Sign(data []byte) ([]byte, error) {
hash := crypto.SHA256.New()
_, err := hash.Write(data)
if err != nil {
return nil, err
}
hashed := hash.Sum(nil)
return rsa.SignPKCS1v15(rand.Reader, s.privKey, crypto.SHA256, hashed)
}
// Headers returns the signer's headers map.
func (s RS256Signer) Headers() jose.Headers {
return s.headers
}
// RS256Verifier is a Jose compliant verifier.
type RS256Verifier struct {
pubKey *rsa.PublicKey
}
// NewRS256Verifier returns a Jose compliant verifier that can be passed as a verifier option to jwt.Parse().
func NewRS256Verifier(pubKey *rsa.PublicKey) *RS256Verifier {
return &RS256Verifier{pubKey: pubKey}
}
// Verify signingInput against the signature. It also validates that joseHeaders includes the right alg.
func (v RS256Verifier) Verify(joseHeaders jose.Headers, _, signingInput, signature []byte) error {
alg, ok := joseHeaders.Algorithm()
if !ok {
return errors.New("alg is not defined")
}
if alg != "RS256" {
return errors.New("alg is not RS256")
}
hash := crypto.SHA256.New()
_, err := hash.Write(signingInput)
if err != nil {
return err
}
hashed := hash.Sum(nil)
return rsa.VerifyPKCS1v15(v.pubKey, crypto.SHA256, hashed, signature)
}
func verifyEd25519(jws string, pubKey ed25519.PublicKey) error {
v, err := NewEd25519Verifier(pubKey)
if err != nil {
return err
}
sVerifier := jose.NewCompositeAlgSigVerifier(jose.AlgSignatureVerifier{
Alg: "EdDSA",
Verifier: v,
})
token, _, err := Parse(jws, WithSignatureVerifier(sVerifier))
if err != nil {
return err
}
if token == nil {
return errors.New("nil token")
}
return nil
}
func verifyRS256(jws string, pubKey *rsa.PublicKey) error {
v := NewRS256Verifier(pubKey)
sVerifier := jose.NewCompositeAlgSigVerifier(jose.AlgSignatureVerifier{
Alg: "RS256",
Verifier: v,
})
token, _, err := Parse(jws, WithSignatureVerifier(sVerifier))
if err != nil {
return err
}
if token == nil {
return errors.New("nil token")
}
return nil
}
func prepareJWSHeaders(headers map[string]interface{}, alg string) map[string]interface{} {
newHeaders := make(map[string]interface{})
for k, v := range headers {
newHeaders[k] = v
}
newHeaders[jose.HeaderAlgorithm] = alg
return newHeaders
}