1/*
2 *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include <cstdio>
12#include <cstdlib>
13#include <string>
14#include <vector>
15#include "third_party/googletest/src/include/gtest/gtest.h"
16#include "test/codec_factory.h"
17#include "test/ivf_video_source.h"
18
19namespace {
20// In a real use the 'decrypt_state' parameter will be a pointer to a struct
21// with whatever internal state the decryptor uses. For testing we'll just
22// xor with a constant key, and decrypt_state will point to the start of
23// the original buffer.
24const uint8_t test_key[16] = { 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
25                               0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0 };
26
27void encrypt_buffer(const uint8_t *src, uint8_t *dst, size_t size,
28                    ptrdiff_t offset) {
29  for (size_t i = 0; i < size; ++i) {
30    dst[i] = src[i] ^ test_key[(offset + i) & 15];
31  }
32}
33
34void test_decrypt_cb(void *decrypt_state, const uint8_t *input, uint8_t *output,
35                     int count) {
36  encrypt_buffer(input, output, count,
37                 input - reinterpret_cast<uint8_t *>(decrypt_state));
38}
39
40}  // namespace
41
42namespace libvpx_test {
43
44TEST(TestDecrypt, DecryptWorksVp8) {
45  libvpx_test::IVFVideoSource video("vp80-00-comprehensive-001.ivf");
46  video.Init();
47
48  vpx_codec_dec_cfg_t dec_cfg = vpx_codec_dec_cfg_t();
49  VP8Decoder decoder(dec_cfg, 0);
50
51  video.Begin();
52
53  // no decryption
54  vpx_codec_err_t res = decoder.DecodeFrame(video.cxdata(), video.frame_size());
55  ASSERT_EQ(VPX_CODEC_OK, res) << decoder.DecodeError();
56
57  // decrypt frame
58  video.Next();
59
60  std::vector<uint8_t> encrypted(video.frame_size());
61  encrypt_buffer(video.cxdata(), &encrypted[0], video.frame_size(), 0);
62  vpx_decrypt_init di = { test_decrypt_cb, &encrypted[0] };
63  decoder.Control(VPXD_SET_DECRYPTOR, &di);
64
65  res = decoder.DecodeFrame(&encrypted[0], encrypted.size());
66  ASSERT_EQ(VPX_CODEC_OK, res) << decoder.DecodeError();
67}
68
69}  // namespace libvpx_test
70