63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
|
package jws
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto"
|
||
|
|
"crypto/ed25519"
|
||
|
|
"crypto/rand"
|
||
|
|
|
||
|
|
"github.com/lestrrat-go/jwx/internal/keyconv"
|
||
|
|
"github.com/lestrrat-go/jwx/jwa"
|
||
|
|
"github.com/pkg/errors"
|
||
|
|
)
|
||
|
|
|
||
|
|
type eddsaSigner struct{}
|
||
|
|
|
||
|
|
func newEdDSASigner() Signer {
|
||
|
|
return &eddsaSigner{}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s eddsaSigner) Algorithm() jwa.SignatureAlgorithm {
|
||
|
|
return jwa.EdDSA
|
||
|
|
}
|
||
|
|
|
||
|
|
func (s eddsaSigner) Sign(payload []byte, key interface{}) ([]byte, error) {
|
||
|
|
if key == nil {
|
||
|
|
return nil, errors.New(`missing private key while signing payload`)
|
||
|
|
}
|
||
|
|
|
||
|
|
// The ed25519.PrivateKey object implements crypto.Signer, so we should
|
||
|
|
// simply accept a crypto.Signer here.
|
||
|
|
signer, ok := key.(crypto.Signer)
|
||
|
|
if !ok {
|
||
|
|
// This fallback exists for cases when jwk.Key was passed, or
|
||
|
|
// users gave us a pointer instead of non-pointer, etc.
|
||
|
|
var privkey ed25519.PrivateKey
|
||
|
|
if err := keyconv.Ed25519PrivateKey(&privkey, key); err != nil {
|
||
|
|
return nil, errors.Wrapf(err, `failed to retrieve ed25519.PrivateKey out of %T`, key)
|
||
|
|
}
|
||
|
|
signer = privkey
|
||
|
|
}
|
||
|
|
return signer.Sign(rand.Reader, payload, crypto.Hash(0))
|
||
|
|
}
|
||
|
|
|
||
|
|
type eddsaVerifier struct{}
|
||
|
|
|
||
|
|
func newEdDSAVerifier() Verifier {
|
||
|
|
return &eddsaVerifier{}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (v eddsaVerifier) Verify(payload, signature []byte, key interface{}) (err error) {
|
||
|
|
if key == nil {
|
||
|
|
return errors.New(`missing public key while verifying payload`)
|
||
|
|
}
|
||
|
|
|
||
|
|
var pubkey ed25519.PublicKey
|
||
|
|
if err := keyconv.Ed25519PublicKey(&pubkey, key); err != nil {
|
||
|
|
return errors.Wrapf(err, `failed to retrieve ed25519.PublicKey out of %T`, key)
|
||
|
|
}
|
||
|
|
if !ed25519.Verify(pubkey, payload, signature) {
|
||
|
|
return errors.New(`failed to match EdDSA signature`)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|