public void RunTest()
{
// Done by sender
//BigInteger p = 2357;
BigInteger p = this.GenerateP(32);
//BigInteger alpha = 2;
BigInteger alpha = Helpers.GetRandomBigInteger(1, p - 1);
//BigInteger a = 1751;
BigInteger a = Helpers.GetRandomBigInteger(1, p - 2);
BigInteger alphaToA = Helpers.SquareAndMultiply(alpha, a, p);
ElGamalPublicKey publicKey = new ElGamalPublicKey(p, alpha, alphaToA);
ElGamalPrivateKey privateKey = new ElGamalPrivateKey(a);
// Done by receiver
int message = 2035;
//BigInteger k = 1520; // Random number 1 <= k <= p-2
BigInteger k = Helpers.GetRandomBigInteger(1, p - 2); // Random number 1 <= k <= p-2
BigInteger gamma = Helpers.SquareAndMultiply(alpha, k, p);
BigInteger delta = (message * Helpers.SquareAndMultiply(publicKey.AlphaToA, k, p)) % p;
Tuple <BigInteger, BigInteger> cipherText = new Tuple <BigInteger, BigInteger>(gamma, delta);
// Done by receiver
BigInteger gammaToTheNegativeA = Helpers.SquareAndMultiply(gamma, (p - 1 - a), p);
BigInteger plainText = gammaToTheNegativeA * delta % p;
Console.WriteLine("plainText: " + message);
Console.WriteLine("cipherText: (" + gamma + "," + delta + ")");
Console.WriteLine("plainText: " + plainText);
}
public void KeyGeneration(int keySize)
{
this.p = this.GenerateP(keySize);
this.alpha = Helpers.GetRandomBigInteger(1, p - 1);
this.a = Helpers.GetRandomBigInteger(1, p - 2);
this.alphaToA = Helpers.SquareAndMultiply(alpha, a, p);
this.PublicKey = new ElGamalPublicKey(p, alpha, alphaToA);
this.PrivateKey = new ElGamalPrivateKey(a);
}
