Method Multiply4

extra/yassl/taocrypt/src/integer.cpp:724–757

void Portable::Multiply4(word *R, const word *A, const word *B)
{
    DWord p;
    word c, d, e;

    p = DWord::Multiply(A[0], B[0]);
    R[0] = p.GetLowHalf();
    c = p.GetHighHalf();
    d = e = 0;

    MulAcc(0, 1);
    MulAcc(1, 0);

    SaveMulAcc(1, 2, 0);
    MulAcc(1, 1);
    MulAcc(0, 2);

    SaveMulAcc(2, 0, 3);
    MulAcc(1, 2);
    MulAcc(2, 1);
    MulAcc(3, 0);

    SaveMulAcc(3, 3, 1);
    MulAcc(2, 2);
    MulAcc(1, 3);

    SaveMulAcc(4, 2, 3);
    MulAcc(3, 2);

    R[5] = c;
    p = DWord::MultiplyAndAdd(A[3], B[3], d);
    R[6] = p.GetLowHalf();
    R[7] = e + p.GetHighHalf();
}

void Portable::Square2(word *R, const word *A)
{