public void ElGamalDec1()
{
ElGamal algorithm = new ElGamal();
int plain = algorithm.Decrypt(2781, 437, 191, 7187);
Assert.AreEqual(plain, 19);
}
public void ElGamalDec2()
{
ElGamal algorithm = new ElGamal();
int plain = algorithm.Decrypt(6066, 899, 118, 6323);
Assert.AreEqual(plain, 111);
}
public bool TryDecryptSessionInfo(ReadOnlySpan <byte> encryptedSessionData, Span <byte> sessionData, out int bytesWritten)
{
var g = MPInteger.ReadInteger(encryptedSessionData, out var gBytesRead);
var p = MPInteger.ReadInteger(encryptedSessionData.Slice(gBytesRead), out var _);
var halfLength = Math.Max(g.Length, p.Length);
var inputData = new byte[halfLength * 2];
g.CopyTo(inputData.AsSpan(halfLength - g.Length));
p.CopyTo(inputData.AsSpan(inputData.Length - p.Length));
var data = elGamal.Decrypt(inputData, RSAEncryptionPadding.Pkcs1);
if (sessionData.Length >= data.Length)
{
data.CopyTo(sessionData);
bytesWritten = data.Length;
return(true);
}
bytesWritten = 0;
return(false);
}