public bool Verify(SignedMessage message)
{
var r = new byte[32];
var s = new byte[32];
Buffer.BlockCopy(message.SignatureBytes, 1, r, 0, 32);
Buffer.BlockCopy(message.SignatureBytes, 33, s, 0, 32);
var recId = message.SignatureBytes[0] - 27;
var magicData = VariableLengthEncoding.GetVariableLengthStringBytes("Bitcoin Signed Message:\n");
var messageData = VariableLengthEncoding.GetVariableLengthStringBytes(message.Message);
var data = new byte[magicData.Length + messageData.Length];
Buffer.BlockCopy(magicData, 0, data, 0, magicData.Length);
Buffer.BlockCopy(messageData, 0, data, magicData.Length, messageData.Length);
var hash = SHA256.DoubleHash(data);
var point = signer.RecoverFromSignature(hash, r.ToBigIntegerUnsigned(true), s.ToBigIntegerUnsigned(true), recId);
var pubKeyHash = Hash160.Hash(point.EncodePoint(false));
var addressBytes = new byte[pubKeyHash.Length + 1];
Buffer.BlockCopy(pubKeyHash, 0, addressBytes, 1, pubKeyHash.Length);
var address = Base58.EncodeWithCheckSum(addressBytes);
if (address == message.Address)
{
return(true);
}
return(false);
}
public static string GetBitcoinAddress(this ECPoint publicKey, bool compressed = true)
{
var pubKeyHash = Hash160.Hash(publicKey.EncodePoint(compressed));
byte[] addressBytes = new byte[pubKeyHash.Length + 1];
Buffer.BlockCopy(pubKeyHash, 0, addressBytes, 1, pubKeyHash.Length);
return(Base58.EncodeWithCheckSum(addressBytes));
}
