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;
}