@Override
public byte[] recoverKey(int recId, byte[] signatureParam, byte[] hashValue) {
Signature signature = Signatures.decodeSignatureParameters(new ByteReader(signatureParam));
Sha256Hash hash = new Sha256Hash(hashValue);
PublicKey key = SignedMessage.recoverFromSignature(recId, signature, hash, false);
if (key != null) {
return key.getPublicKeyBytes();
} else {
return null;
}
}