*ret = make_v4_uuid(t);
return 0;
}
+
+_public_ int sd_id128_get_machine_app_specific(sd_id128_t app_id, sd_id128_t *ret) {
+ _cleanup_(khash_unrefp) khash *h = NULL;
+ sd_id128_t m, result;
+ const void *p;
+ int r;
+
+ assert_return(ret, -EINVAL);
+
+ r = sd_id128_get_machine(&m);
+ if (r < 0)
+ return r;
+
+ r = khash_new_with_key(&h, "hmac(sha256)", &m, sizeof(m));
+ if (r < 0)
+ return r;
+
+ r = khash_put(h, &app_id, sizeof(app_id));
+ if (r < 0)
+ return r;
+
+ r = khash_digest_data(h, &p);
+ if (r < 0)
+ return r;
+
+ /* We chop off the trailing 16 bytes */
+ memcpy(&result, p, MIN(khash_get_size(h), sizeof(result)));
+
+ *ret = make_v4_uuid(result);
+ return 0;
+}