PublicKeyReverseDigest, PublicKeyReverseDigestAndSignature

[gogost.git] / gost3410 / private.go

diff --git a/gost3410/private.go b/gost3410/private.go
index 18549a29cf1f0f8718af45fef3059ba0183c7977..be10c1f394905cc4858c25fd2f08015e5e4de756 100644 (file)
--- a/gost3410/private.go
+++ b/gost3410/private.go
@@ -139,8 +139,11 @@ Retry:
        ), nil
 }
 
-// Sign the digest. opts argument is unused.
-func (prv *PrivateKey) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
+// Sign the digest. opts argument is unused. That is identical to SignDigest,
+// but kept to be friendly to crypto.Signer.
+func (prv *PrivateKey) Sign(
+       rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
        return prv.SignDigest(digest, rand)
 }
 
@@ -160,11 +163,14 @@ func (prv *PrivateKeyReverseDigest) Public() crypto.PublicKey {
        return prv.Prv.Public()
 }
 
-func (prv *PrivateKeyReverseDigest) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
-       d := make([]byte, len(digest))
-       copy(d, digest)
-       reverse(d)
-       return prv.Prv.Sign(rand, d, opts)
+func (prv *PrivateKeyReverseDigest) Sign(
+       rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
+       dgst := make([]byte, len(digest))
+       for i := 0; i < len(digest); i++ {
+               dgst[i] = digest[len(digest)-i-1]
+       }
+       return prv.Prv.Sign(rand, dgst, opts)
 }
 
 type PrivateKeyReverseDigestAndSignature struct {
@@ -175,11 +181,14 @@ func (prv *PrivateKeyReverseDigestAndSignature) Public() crypto.PublicKey {
        return prv.Prv.Public()
 }
 
-func (prv *PrivateKeyReverseDigestAndSignature) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
-       d := make([]byte, len(digest))
-       copy(d, digest)
-       reverse(d)
-       sign, err := prv.Prv.Sign(rand, d, opts)
+func (prv *PrivateKeyReverseDigestAndSignature) Sign(
+       rand io.Reader, digest []byte, opts crypto.SignerOpts,
+) ([]byte, error) {
+       dgst := make([]byte, len(digest))
+       for i := 0; i < len(digest); i++ {
+               dgst[i] = digest[len(digest)-i-1]
+       }
+       sign, err := prv.Prv.Sign(rand, dgst, opts)
        if err != nil {
                return sign, err
        }