public Reducer(UInt32MontgomeryReduction reduction, uint modulus)
: base(reduction, modulus)
{
if ((modulus & 1) == 0)
{
throw new InvalidOperationException("not relatively prime");
}
var nInv = IntegerMath.ModularInversePowerOfTwoModulus(modulus, 32);
k0 = IntegerMath.TwosComplement(nInv);
var rModN = uint.MaxValue % modulus + 1;
rSquaredModN = IntegerMath.ModularProduct(rModN, rModN, modulus);
}
public Reducer(UInt64MontgomeryReduction reduction, ulong modulus)
: base(reduction, modulus)
{
if ((modulus & 1) == 0)
{
throw new InvalidOperationException("not relatively prime");
}
int rLength = modulus == (uint)modulus ? 32 : 64;
var rMinusOne = rLength == 32 ? uint.MaxValue : ulong.MaxValue;
var rModN = rMinusOne % modulus + 1;
rSquaredModN = IntegerMath.ModularProduct(rModN, rModN, modulus);
var nInv = IntegerMath.ModularInversePowerOfTwoModulus(modulus, rLength);
k0 = (uint)IntegerMath.TwosComplement(nInv);
oneRep = 0;
}
