public void Init(byte[] x)
{
lookupPowX2[0] = GcmUtilities.OneAsBytes();
lookupPowX2[1] = Arrays.Clone(x);
for (int i = 2; i != 64; ++i)
{
byte[] tmp = Arrays.Clone(lookupPowX2[i - 1]);
GcmUtilities.Multiply(tmp, tmp);
lookupPowX2[i] = tmp;
}
}
public void ExponentiateX(long pow, byte[] output)
{
byte[] y = GcmUtilities.OneAsBytes();
int powX2 = 1;
while (pow > 0)
{
if ((pow & 1L) != 0)
{
GcmUtilities.Multiply(y, lookupPowX2[powX2]);
}
++powX2;
pow >>= 1;
}
Array.Copy(y, 0, output, 0, 16);
}
public void ExponentiateX(long pow, byte[] output)
{
byte[] y = GcmUtilities.OneAsBytes();
int bit = 0;
while (pow > 0)
{
if ((pow & 1L) != 0)
{
EnsureAvailable(bit);
GcmUtilities.Multiply(y, (byte[])lookupPowX2[bit]);
}
++bit;
pow >>= 1;
}
Array.Copy(y, 0, output, 0, 16);
}
public void ExponentiateX(long pow, byte[] output)
{
// Initial value is little-endian 1
byte[] y = GcmUtilities.OneAsBytes();
if (pow > 0)
{
byte[] powX = Arrays.Clone(x);
do
{
if ((pow & 1L) != 0)
{
GcmUtilities.Multiply(y, powX);
}
GcmUtilities.Multiply(powX, powX);
pow >>= 1;
}while (pow > 0);
}
Array.Copy(y, 0, output, 0, 16);
}