static void nh_aux()

in umac.c [412:463]

• 42 lines of code
• 2 McCabe index (conditional complexity)

static void nh_aux(void *kp, const void *dp, void *hp, UINT32 dlen)
/* Same as previous nh_aux, but two streams are handled in one pass,
 * reading and writing 24 bytes of hash-state per call.
*/
{
    UINT64 h1,h2,h3;
    UWORD c = dlen / 32;
    UINT32 *k = (UINT32 *)kp;
    const UINT32 *d = (const UINT32 *)dp;
    UINT32 d0,d1,d2,d3,d4,d5,d6,d7;
    UINT32 k0,k1,k2,k3,k4,k5,k6,k7,
        k8,k9,k10,k11,k12,k13,k14,k15;

    h1 = *((UINT64 *)hp);
    h2 = *((UINT64 *)hp + 1);
    h3 = *((UINT64 *)hp + 2);
    k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
    k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
    do {
        d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1);
        d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3);
        d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5);
        d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7);
        k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11);
        k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15);

        h1 += MUL64((k0 + d0), (k4 + d4));
        h2 += MUL64((k4 + d0), (k8 + d4));
        h3 += MUL64((k8 + d0), (k12 + d4));

        h1 += MUL64((k1 + d1), (k5 + d5));
        h2 += MUL64((k5 + d1), (k9 + d5));
        h3 += MUL64((k9 + d1), (k13 + d5));

        h1 += MUL64((k2 + d2), (k6 + d6));
        h2 += MUL64((k6 + d2), (k10 + d6));
        h3 += MUL64((k10 + d2), (k14 + d6));

        h1 += MUL64((k3 + d3), (k7 + d7));
        h2 += MUL64((k7 + d3), (k11 + d7));
        h3 += MUL64((k11 + d3), (k15 + d7));

        k0 = k8; k1 = k9; k2 = k10; k3 = k11;
        k4 = k12; k5 = k13; k6 = k14; k7 = k15;

        d += 8;
        k += 8;
    } while (--c);
    ((UINT64 *)hp)[0] = h1;
    ((UINT64 *)hp)[1] = h2;
    ((UINT64 *)hp)[2] = h3;
}