Comment 1 for bug 1859713

Hi,

Here is a patch for this bug. The sbox function was using "b+=16" instead of "b+=4".

Also, you check test vector using :

```c
    uint64_t P = 0xfb623599da6e8127ull;
    uint64_t T = 0x477d469dec0b8762ull;
    uint64_t w0 = 0x84be85ce9804e94bull;
    uint64_t k0 = 0xec2802d4e0a488e9ull;
    ARMPACKey key = { .hi = w0, .lo = k0 };
    uint64_t C5 = pauth_computepac(P, T, key);
    /* C5 should be 0xc003b93999b33765 */
```