/// <summary>
/// Reduce this GF2nPolynomialElement using the pentanomial x^n + x^pc[2] + x^pc[1] + x^pc[0] + 1 as fieldpolynomial.
/// The coefficients are reduced bit by bit.
/// </summary>
private void ReducePentanomialBitwise(int[] Pc)
{
int i;
int k = mDegree - Pc[2];
int l = mDegree - Pc[1];
int m = mDegree - Pc[0];
for (i = polynomial.Length - 1; i >= mDegree; i--)
{
if (polynomial.TestBit(i))
{
polynomial.XorBit(i);
polynomial.XorBit(i - k);
polynomial.XorBit(i - l);
polynomial.XorBit(i - m);
polynomial.XorBit(i - mDegree);
}
}
polynomial.ReduceN();
polynomial.ExpandN(mDegree);
}