public static SignatureData SignMessage(byte[] message, ECKeyPair keys, bool needToHash)
{
BigInteger publicKey = keys.PublicKey;
var messageHash = needToHash ? Hash.Blake2B(message) : message;
var recId = -1;
ECDSASignature sig = keys.Sign(messageHash);
for (int i = 0; i < 4; i++)
{
BigInteger k = RecoverFromSignature(i, sig, messageHash);
if (k != null && k.Equals(publicKey))
{
recId = i;
break;
}
}
if (recId == -1)
{
throw new FormatException("Sign the data failed.");
}
if (recId == 2 || recId == 3)
{
throw new InvalidOperationException("Recovery is not valid for VeChain MainNet.");
}
byte v = (byte)recId;
byte[] r = sig.R.ToByteArrayUnsigned().PadLeading(32);
byte[] s = sig.S.ToByteArrayUnsigned().PadLeading(32);
return(new SignatureData(v, r, s));
}