bn_mul_part_recursive
void bn_mul_part_recursive(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b,
bn_mul_part_recursive(rr->d, a->d, b->d,
bn_mul_part_recursive(rr->d, a->d, b->d,
bn_mul_part_recursive(&(r[n2]), &(a[n]), &(b[n]),
bn_mul_part_recursive(&(r[n2]),