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] = {
25  0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78,
26  0x89, 0x9a, 0xab, 0xbc, 0xcd, 0xde, 0xef, 0xf0
27};
28
29void encrypt_buffer(const uint8_t *src, uint8_t *dst, size_t size,
30                    ptrdiff_t offset) {
31  for (size_t i = 0; i < size; ++i) {
32    dst[i] = src[i] ^ test_key[(offset + i) & 15];
33  }
34}
35
36void test_decrypt_cb(void *decrypt_state, const uint8_t *input,
37                     uint8_t *output, int count) {
38  encrypt_buffer(input, output, count,
39                 input - reinterpret_cast<uint8_t *>(decrypt_state));
40}
41
42}  // namespace
43
44namespace libvpx_test {
45
46TEST(TestDecrypt, DecryptWorksVp8) {
47  libvpx_test::IVFVideoSource video("vp80-00-comprehensive-001.ivf");
48  video.Init();
49
50  vpx_codec_dec_cfg_t dec_cfg = vpx_codec_dec_cfg_t();
51  VP8Decoder decoder(dec_cfg, 0);
52
53  video.Begin();
54
55  // no decryption
56  vpx_codec_err_t res = decoder.DecodeFrame(video.cxdata(), video.frame_size());
57  ASSERT_EQ(VPX_CODEC_OK, res) << decoder.DecodeError();
58
59  // decrypt frame
60  video.Next();
61
62  std::vector<uint8_t> encrypted(video.frame_size());
63  encrypt_buffer(video.cxdata(), &encrypted[0], video.frame_size(), 0);
64  vpx_decrypt_init di = { test_decrypt_cb, &encrypted[0] };
65  decoder.Control(VPXD_SET_DECRYPTOR, &di);
66
67  res = decoder.DecodeFrame(&encrypted[0], encrypted.size());
68  ASSERT_EQ(VPX_CODEC_OK, res) << decoder.DecodeError();
69}
70
71}  // namespace libvpx_test
72