public static List <BigInteger> GetPrimeFactors(BigInteger p)
{
var list = new List <BigInteger>();
if (p % 2 == 0)
{
list.Add(2);
while (p % 2 == 0)
{
p = p / 2;
}
}
for (int i = 3; i <= BigIntegerExtension.Sqrt(p) + 1; i = i + 2)
{
if (p % i == 0)
{
list.Add(i);
while (p % i == 0)
{
p = p / i;
}
}
}
if (p > 2)
{
list.Add(p);
}
return(list);
}
public static BigInteger SolveLinearEquatation(DLPInput input, BigInteger logatithmicExpression, BigInteger a, BigInteger b)
{
var mod = input.order;
var gcd = BigInteger.GreatestCommonDivisor(a, mod);
if (gcd == -1)
{
return((b * a.ModInverse(mod)).ModPositive(mod));
}
else
{
//return 1;
Console.WriteLine(gcd);
BigInteger u, v;
BigIntegerExtension.ExtendedGcd(a, mod, out u, out v);
var reducedMOD = mod / gcd;
var x0 = ((b / gcd) * u).ModPositive(reducedMOD);
for (BigInteger j = 0; j < gcd; j++)
{
var x = x0 + j * reducedMOD;
// Console.WriteLine(x);
if (BigInteger.ModPow(input.g, x, input.p) == logatithmicExpression)
{
return(x);
}
}
}
return(-1);
}
