bytepad
static int bytepad(unsigned char *out, size_t *out_len,
if (!bytepad(NULL, &out_len, kmac_string, sizeof(kmac_string),
res = bytepad(out, NULL, kmac_string, sizeof(kmac_string),
if (!bytepad(NULL, out_len, tmp, tmp_len, NULL, 0, w))
return bytepad(out, NULL, tmp, tmp_len, NULL, 0, w);