public void ExponentiateX(long pow, byte[] output)
        {
            ulong[] y   = GcmUtilities.OneAsUlongs();
            int     bit = 0;

            while (pow > 0)
            {
                if ((pow & 1L) != 0)
                {
                    EnsureAvailable(bit);
                    GcmUtilities.Multiply(y, (ulong[])lookupPowX2[bit]);
                }
                ++bit;
                pow >>= 1;
            }

            GcmUtilities.AsBytes(y, output);
        }
        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);
        }