private void encrypt_Click(object sender, RoutedEventArgs e)
{
KeyGen key = new KeyGen();
int p = key.GenerateP();
int g = key.GenerateG(p);
int x = key.GenerateX(p);
int y = key.FastExponentiation(p, g, x);
cipher_a.Text = "";
cipher_b.Text = "";
string src = source.Text;
Gamal elGamal = new Gamal();
int[] res = new int[2];
for (int i = 0; i < src.Length; i++)
{
int symbol = Convert.ToInt32(source.Text[i]);
res = elGamal.Encrypt(p, g, y, symbol);
cipher_a.Text += Convert.ToString(res[0]);
cipher_b.Text += Convert.ToString(res[1]);
cipher_a.Text += " ";
cipher_b.Text += " ";
}
keyP.Text = Convert.ToString(p);
keyG.Text = Convert.ToString(g);
keyY.Text = Convert.ToString(y);
keyX.Text = Convert.ToString(x);
}
public char Decrypt(int p, int x, int a, int b)
{
KeyGen key = new KeyGen();
int buf = key.FastExponentiation((BigInteger)p, (BigInteger)a, (BigInteger)(p - 1 - x));
char message = (char)(key.Mul(b, buf, p));
return message;
}
public int[] Encrypt(int p, int g, int y, int src)
{
KeyGen key = new KeyGen();
Random rnd = new Random();
int k = rnd.Next(1, p - 1);
while (!key.IsCoprime(k, p - 1))
{
k = rnd.Next(1, p - 1);
}
int m = src;
int a = key.FastExponentiation((BigInteger)p, (BigInteger)g, (BigInteger)k);
int b = key.FastExponentiation((BigInteger)p, (BigInteger)y, (BigInteger)k);
b = key.Mul(b, m, p);
int[] res = new int[2];
res[0] = a;
res[1] = b;
return res;
}