Hi guys,
I am developing a client via cryptopp, the server side is developer by
golang.
I generate the signature using the API below:
StringSource( message, true,
new SignerFilter( prng,
ECDSA<ECP,SHA1>::Signer(key),
new StringSink( signature )
) // SignerFilter
); // StringSource
And then the base64-encoded signature to the server.
Since the golang pkg/crypto/ecdsa/#Verify
<http://localhost:6060/pkg/crypto/ecdsa/#Verify> verify only supports (r,s)
func Verify(pub *PublicKey <http://localhost:6060/pkg/crypto/ecdsa/#PublicKey>,
hash []byte <http://localhost:6060/pkg/builtin/#byte>, r, s *big
<http://localhost:6060/pkg/math/big/>.Int
<http://localhost:6060/pkg/math/big/#Int>) bool
<http://localhost:6060/pkg/builtin/#bool>
after base64-decode the signature, and call below not able to get R, S.
type ecdsaSignature struct {
R, S *big.Int
}
sig := new(ecdsaSignature)
rest, err := asn1.Unmarshal(t.Signature, sig)
Let's for now put the server side code aside.
My question is, is there any example which is related to the (R, S) ?
For example, an API returns (R,S) and encode them in some format?
Any insight would be much appreciated!
Best Regards,
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