bn_mulw_words
l0 = bn_mulw_words(tmp->d, sdiv->d, div_n, q);
BN_ULONG bn_mulw_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w);
(void)bn_mulw_words(r, a, a_len, 0);
rr[0] = bn_mulw_words(r, a, a_len, b[0]);
rp[n] = bn_mulw_words(rp, ap, n, w);
ll = bn_mulw_words(a->d, a->d, a->top, w);