| 349 | |
| 350 | #define INITIAL_BUFLEN 1024 |
| 351 | srtp_err_status_t cipher_driver_test_buffering(srtp_cipher_t *c) |
| 352 | { |
| 353 | int i, j, num_trials = 1000; |
| 354 | unsigned len, buflen = INITIAL_BUFLEN; |
| 355 | uint8_t buffer0[INITIAL_BUFLEN], buffer1[INITIAL_BUFLEN], *current, *end; |
| 356 | uint8_t idx[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 357 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0x34 }; |
| 358 | srtp_err_status_t status; |
| 359 | |
| 360 | printf("testing output buffering for cipher %s...", c->type->description); |
| 361 | |
| 362 | for (i = 0; i < num_trials; i++) { |
| 363 | /* set buffers to zero */ |
| 364 | for (j = 0; j < (int)buflen; j++) { |
| 365 | buffer0[j] = buffer1[j] = 0; |
| 366 | } |
| 367 | |
| 368 | /* initialize cipher */ |
| 369 | status = srtp_cipher_set_iv(c, (uint8_t *)idx, srtp_direction_encrypt); |
| 370 | if (status) |
| 371 | return status; |
| 372 | |
| 373 | /* generate 'reference' value by encrypting all at once */ |
| 374 | status = srtp_cipher_encrypt(c, buffer0, &buflen); |
| 375 | if (status) |
| 376 | return status; |
| 377 | |
| 378 | /* re-initialize cipher */ |
| 379 | status = srtp_cipher_set_iv(c, (uint8_t *)idx, srtp_direction_encrypt); |
| 380 | if (status) |
| 381 | return status; |
| 382 | |
| 383 | /* now loop over short lengths until buffer1 is encrypted */ |
| 384 | current = buffer1; |
| 385 | end = buffer1 + buflen; |
| 386 | while (current < end) { |
| 387 | /* choose a short length */ |
| 388 | len = srtp_cipher_rand_u32_for_tests() & 0x01f; |
| 389 | |
| 390 | /* make sure that len doesn't cause us to overreach the buffer */ |
| 391 | if (current + len > end) |
| 392 | len = (unsigned)(end - current); |
| 393 | |
| 394 | status = srtp_cipher_encrypt(c, current, &len); |
| 395 | if (status) |
| 396 | return status; |
| 397 | |
| 398 | /* advance pointer into buffer1 to reflect encryption */ |
| 399 | current += len; |
| 400 | |
| 401 | /* if buffer1 is all encrypted, break out of loop */ |
| 402 | if (current == end) |
| 403 | break; |
| 404 | } |
| 405 | |
| 406 | /* compare buffers */ |
| 407 | for (j = 0; j < (int)buflen; j++) { |
| 408 | if (buffer0[j] != buffer1[j]) { |
no test coverage detected