private static bool RoundConstant(int t)
{
t = Bin.Mod(t, 255);
if (_roundConstants.ContainsKey(t))
{
return(_roundConstants[t]);
}
Bitstring r = new Bitstring("10000000", 8);
for (int i = 0; i < t; i++)
{
r.Prepend(Bitstring.Zero);
r[0] ^= r[8];
r[4] ^= r[8];
r[5] ^= r[8];
r[6] ^= r[8];
r = r.Truncate(8);
}
bool bit = r[0];
_roundConstants.Add(t, bit);
return(bit);
}
