Switch message cipher consumers to shared media API

tests/test_dm_worker.c

@@ -45,11 +45,11 @@ static void work(void* arg) {
         rewind(source); rewind(cipher);
         /* Каждый новый шифротекст получает отдельный media_id. */
         memcpy(id, &t->encryptions, sizeof(t->encryptions));
-        if (dm_media_encrypt_stream(key, 42, id, source, cipher, &size, hash)) goto done;
+        if (media_encrypt_stream(key, 42, id, source, cipher, &size, hash)) goto done;
         t->encryptions++;
     } while (get_time_tb() < until);
     rewind(cipher);
-    if (size != 8 * 1024 * 1024 || dm_media_decrypt_stream(key, 42, id, size, hash, cipher, plain)) goto done;
+    if (size != 8 * 1024 * 1024 || media_decrypt_stream(key, 42, id, size, hash, cipher, plain)) goto done;
     rewind(plain);
     SHA256_Init(&digest);
     size_t n;