public bool Verify(byte[] signature, byte[] data, uint160 nonce)
{
byte[] output = new byte[256];
var msg = Utils.Combine(nonce.ToBytes(), data);
Sha512Digest sha512 = new Sha512Digest();
var generator = new Mgf1BytesGenerator(sha512);
generator.Init(new MgfParameters(msg));
generator.GenerateBytes(output, 0, output.Length);
var input = new BigInteger(1, output);
if (input.CompareTo(this._Key.Modulus) >= 0)
{
return(false);
}
if (signature.Length > 256)
{
return(false);
}
var signatureInt = new BigInteger(1, signature);
if (signatureInt.CompareTo(this._Key.Modulus) >= 0)
{
return(false);
}
var engine = new RsaBlindedEngine();
engine.Init(false, this._Key);
return(input.Equals(engine.ProcessBlock(signatureInt)));
}
public byte[] Sign(byte[] data, out uint160 nonce)
{
while (true)
{
byte[] output = new byte[256];
nonce = new uint160(RandomUtils.GetBytes(20));
Sha512Digest sha512 = new Sha512Digest();
var msg = Utils.Combine(nonce.ToBytes(), data);
var generator = new Mgf1BytesGenerator(sha512);
generator.Init(new MgfParameters(msg));
generator.GenerateBytes(output, 0, output.Length);
var input = new BigInteger(1, output);
if (input.CompareTo(this._Key.Modulus) >= 0)
{
continue;
}
var engine = new RsaBlindedEngine();
engine.Init(true, this._Key);
return(engine.ConvertOutput(engine.ProcessBlock(input)));
}
}
