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// +build libsecp256k1
package secp256k1
import (
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/tendermint/tendermint/crypto"
)
// Sign creates an ECDSA signature on curve Secp256k1, using SHA256 on the msg.
func (privKey PrivKeySecp256k1) Sign(msg []byte) ([]byte, error) {
rsv, err := secp256k1.Sign(crypto.Sha256(msg), privKey[:])
if err != nil {
return nil, err
}
// we do not need v in r||s||v:
rs := rsv[:len(rsv)-1]
return rs, nil
}
func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, sig []byte) bool {
return secp256k1.VerifySignature(pubKey[:], crypto.Sha256(msg), sig)
}