public static Integer RandomI(Integer min, Integer max)
{
var seed = (uint)DateTime.Now.Ticks;
var generator = new LehmerHigh(seed);
var bitLength = Tools.BitLength(max);
Integer R;
do
{
R = NumberTheory.Mod(
Tools.ToInteger(generator.RandomBits(bitLength + 1)), max + 1);
} while (!(min < R && R < max));
return(R);
}
public static bool MillerRabin(Integer p)
{
string[] primesStr = System.IO.File.ReadAllText("./Generated/primes.txt").Split(' ');
for (int i = 0; i < 100; i++)
{
if (p % int.Parse(primesStr[i]) == 0)
{
return(false);
}
}
Integer d = p - 1, modPow, x;
int s, k = 100; // Pow(1/4, k) = probability of p being pseudo-prime
bool check = false;
for (s = 0; s < (p - 1).ToByteArray().Length; s++)
{
if (d % 2 == 0)
{
d /= 2;
}
else
{
break;
}
}
s++;
while (k != 0)
{
x = MathI.RandomI(1, p);
if (NumberTheory.GCD(x, p) != 1)
{
return(false);
}
modPow = x.ModPow(d, p);
if (modPow == 1 || modPow == p - 1)
{
k--;
continue;
}
x = x.ModPow(d, p);
for (int i = 0; i < s; i++)
{
x = x.ModPow(2, p);
if (x == p - 1)
{
check = true;
break;
}
else if (x == 1)
{
return(false);
}
}
if (!check)
{
return(false);
}
k--;
}
return(true);
}
