func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
if len(hash) != 32 {
return nil, fmt.Errorf("hash is required to be exactly 32 bytes (%d)", len(hash))
}
sig, err = secp256k1.Sign(hash, common.LeftPadBytes(prv.D.Bytes(), prv.Params().BitSize/8))
return
}
// NewEcdsaPrivateKey creates a new JWK from a EC-DSA private key
func NewEcdsaPrivateKey(pk *ecdsa.PrivateKey) *EcdsaPrivateKey {
pubkey := NewEcdsaPublicKey(&pk.PublicKey)
privkey := &EcdsaPrivateKey{EcdsaPublicKey: pubkey}
privkey.D.SetBytes(i2osp(pk.D, pk.Params().BitSize/8))
return privkey
}