private void EnsureAvailable(int bit)
{
int count = lookupPowX2.Count;
if (count <= bit)
{
ulong[] tmp = (ulong[])lookupPowX2[count - 1];
do
{
tmp = Arrays.Clone(tmp);
GcmUtilities.Square(tmp, tmp);
lookupPowX2.Add(tmp);
}while (++count <= bit);
}
}
public void ExponentiateX(long pow, byte[] output)
{
// Initial value is little-endian 1
ulong[] y = GcmUtilities.OneAsUlongs();
if (pow > 0)
{
ulong[] powX = Arrays.Clone(x);
do
{
if ((pow & 1L) != 0)
{
GcmUtilities.Multiply(y, powX);
}
GcmUtilities.Square(powX, powX);
pow >>= 1;
}while (pow > 0);
}
GcmUtilities.AsBytes(y, output);
}