private BigInteger GetSquareRestForPoints()
{
bool isSquareRest = false;
BigInteger value;
BigInteger x;
while (!isSquareRest)
{
x = GetRandomValue();
value = GetYSquare(x);
isSquareRest = SquareRest.IsSquareRest(modulo, value);
}
return(x);
}
public Point EncryptMessage(string massage, BigInteger ni)
{
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(massage);
BigInteger M = new BigInteger(bytes);
for (int i = 1; i <= ni; i++)
{
BigInteger x = (M * ni + i) % modulo;
BigInteger ySquare = (BigInteger.ModPow(x, 3, modulo) + x * A + B) % modulo;
if (SquareRest.IsSquareRest(modulo, ySquare))
{
BigInteger y = BigIntigerMath.SqrtModEuler(ySquare, modulo);
return(new Point(x, y));
}
}
return(new Point(-1));
}