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<div class="title">aes_decryptor.cc</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2016 Google Inc. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Use of this source code is governed by a BSD-style</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// license that can be found in the LICENSE file or at</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/base/aes_decryptor.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <openssl/aes.h></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <openssl/err.h></span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <openssl/rand.h></span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// AES defines three key sizes: 128, 192 and 256 bits.</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keywordtype">bool</span> IsKeySizeValidForAes(<span class="keywordtype">size_t</span> key_size) {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordflow">return</span> key_size == 16 || key_size == 24 || key_size == 32;</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> }</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> AesDecryptor::AesDecryptor() {}</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> AesDecryptor::~AesDecryptor() {}</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">bool</span> AesDecryptor::Decrypt(<span class="keyword">const</span> std::vector<uint8_t>& ciphertext,</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  std::vector<uint8_t>* plaintext) {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  plaintext->resize(ciphertext.size());</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">size_t</span> plaintext_size;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">if</span> (!<a class="code" href="../../d9/d96/classedash__packager_1_1media_1_1AesDecryptor.html#ab069c70e1ceb84e7223a09df04af56da">DecryptInternal</a>(ciphertext.data(), ciphertext.size(), plaintext->data(),</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  &plaintext_size))</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  plaintext->resize(plaintext_size);</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> }</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keywordtype">bool</span> AesDecryptor::Decrypt(<span class="keyword">const</span> std::string& ciphertext,</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  std::string* plaintext) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  plaintext->resize(ciphertext.size());</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">size_t</span> plaintext_size;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">if</span> (!<a class="code" href="../../d9/d96/classedash__packager_1_1media_1_1AesDecryptor.html#ab069c70e1ceb84e7223a09df04af56da">DecryptInternal</a>(reinterpret_cast<const uint8_t*>(ciphertext.data()),</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  ciphertext.size(),</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">reinterpret_cast<</span>uint8_t*<span class="keyword">></span>(string_as_array(plaintext)),</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  &plaintext_size))</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  plaintext->resize(plaintext_size);</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> AesCtrDecryptor::AesCtrDecryptor() {}</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> AesCtrDecryptor::~AesCtrDecryptor() {}</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#afe5ed7534a8a187247ede28b6446f071"> 60</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#afe5ed7534a8a187247ede28b6446f071">AesCtrDecryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  encryptor_.reset(<span class="keyword">new</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>);</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> encryptor_->InitializeWithIv(key, iv);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> }</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b"> 66</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b">AesCtrDecryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  DCHECK(encryptor_);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> encryptor_->SetIv(iv);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#aadbe5fbd2984565db8733a0ac0a1e621"> 71</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#aadbe5fbd2984565db8733a0ac0a1e621">AesCtrDecryptor::DecryptInternal</a>(<span class="keyword">const</span> uint8_t* ciphertext,</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordtype">size_t</span> ciphertext_size,</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  uint8_t* plaintext,</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">size_t</span>* plaintext_size) {</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  DCHECK(encryptor_);</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  *plaintext_size = ciphertext_size;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// For AES CTR, encryption and decryption are identical.</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> encryptor_->Encrypt(ciphertext, ciphertext_size, plaintext);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
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<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ab813a2b1a8f31aa15161c33a686b0908"> 81</a></span> <a class="code" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ab813a2b1a8f31aa15161c33a686b0908">AesCbcDecryptor::AesCbcDecryptor</a>(CbcPaddingScheme padding_scheme,</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">bool</span> chain_across_calls)</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  : padding_scheme_(padding_scheme),</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  chain_across_calls_(chain_across_calls) {</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span> (padding_scheme_ != kNoPadding) {</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  CHECK(!chain_across_calls) << <span class="stringliteral">"cipher block chain across calls only makes "</span></div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="stringliteral">"sense if the padding_scheme is kNoPadding."</span>;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> }</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> AesCbcDecryptor::~AesCbcDecryptor() {}</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
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<div class="line"><a name="l00092"></a><span class="lineno"><a class="line" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a59bac38018c269795c588169e98a5b41"> 92</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a59bac38018c269795c588169e98a5b41">AesCbcDecryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  }</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  aes_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  CHECK_EQ(AES_set_decrypt_key(key.data(), key.size() * 8, aes_key_.get()), 0);</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> <a class="code" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a4e949751428f80a05a2093d54ffab7c8">SetIv</a>(iv);</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div>
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<div class="line"><a name="l00105"></a><span class="lineno"><a class="line" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a4e949751428f80a05a2093d54ffab7c8"> 105</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a4e949751428f80a05a2093d54ffab7c8">AesCbcDecryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  iv_ = iv;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
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<div class="line"><a name="l00115"></a><span class="lineno"><a class="line" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ac663bc4d532e633168f59fe16d9333fc"> 115</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ac663bc4d532e633168f59fe16d9333fc">AesCbcDecryptor::DecryptInternal</a>(<span class="keyword">const</span> uint8_t* ciphertext,</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordtype">size_t</span> ciphertext_size,</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  uint8_t* plaintext,</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordtype">size_t</span>* plaintext_size) {</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  DCHECK(plaintext_size);</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  DCHECK(aes_key_);</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// Plaintext size is the same as ciphertext size except for pkcs5 padding.</span></div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// Will update later if using pkcs5 padding.</span></div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  *plaintext_size = ciphertext_size;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (ciphertext_size == 0) {</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (padding_scheme_ == kPkcs5Padding) {</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  LOG(ERROR) << <span class="stringliteral">"Expected ciphertext to be at least "</span> << AES_BLOCK_SIZE</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  << <span class="stringliteral">" bytes with Pkcs5 padding"</span>;</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  std::vector<uint8_t> local_iv(iv_);</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> residual_block_size = ciphertext_size % AES_BLOCK_SIZE;</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (residual_block_size == 0) {</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  AES_cbc_encrypt(ciphertext, plaintext, ciphertext_size, aes_key_.get(),</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  local_iv.data(), AES_DECRYPT);</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span> (chain_across_calls_)</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  iv_ = local_iv;</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">if</span> (padding_scheme_ != kPkcs5Padding)</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> </div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="comment">// Strip off PKCS5 padding bytes.</span></div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keyword">const</span> uint8_t num_padding_bytes = plaintext[ciphertext_size - 1];</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (num_padding_bytes > AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  LOG(ERROR) << <span class="stringliteral">"Padding length is too large : "</span></div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  << <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(num_padding_bytes);</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  }</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  *plaintext_size -= num_padding_bytes;</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (padding_scheme_ != kCtsPadding) {</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  LOG(ERROR) << <span class="stringliteral">"Expecting cipher text size to be multiple of "</span></div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  << AES_BLOCK_SIZE << <span class="stringliteral">", got "</span> << ciphertext_size;</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  DCHECK(!chain_across_calls_);</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  DCHECK_EQ(padding_scheme_, kCtsPadding);</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">if</span> (ciphertext_size < AES_BLOCK_SIZE) {</div>
|
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// Don't have a full block, leave unencrypted.</span></div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  memcpy(plaintext, ciphertext, ciphertext_size);</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  }</div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// AES-CBC decrypt everything up to the next-to-last full block.</span></div>
|
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> cbc_size = ciphertext_size - residual_block_size;</div>
|
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (cbc_size > AES_BLOCK_SIZE) {</div>
|
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  AES_cbc_encrypt(ciphertext, plaintext, cbc_size - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  aes_key_.get(), local_iv.data(), AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
|
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keyword">const</span> uint8_t* next_to_last_ciphertext_block =</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  ciphertext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  uint8_t* next_to_last_plaintext_block =</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  plaintext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="comment">// Determine what the last IV should be so that we can "skip ahead" in the</span></div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">// CBC decryption.</span></div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  std::vector<uint8_t> last_iv(</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  ciphertext + ciphertext_size - residual_block_size,</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  ciphertext + ciphertext_size);</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  last_iv.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// Decrypt the next-to-last block using the IV determined above. This decrypts</span></div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// the residual block bits.</span></div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  AES_cbc_encrypt(next_to_last_ciphertext_block, next_to_last_plaintext_block,</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  AES_BLOCK_SIZE, aes_key_.get(), last_iv.data(), AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">// Swap back the residual block bits and the next-to-last block.</span></div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">if</span> (plaintext == ciphertext) {</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  std::swap_ranges(next_to_last_plaintext_block,</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  next_to_last_plaintext_block + residual_block_size,</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  next_to_last_plaintext_block + AES_BLOCK_SIZE);</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  } <span class="keywordflow">else</span> {</div>
|
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  memcpy(next_to_last_plaintext_block + AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  next_to_last_plaintext_block, residual_block_size);</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  memcpy(next_to_last_plaintext_block,</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  next_to_last_ciphertext_block + AES_BLOCK_SIZE, residual_block_size);</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div>
|
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div>
|
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// Decrypt the next-to-last full block.</span></div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  AES_cbc_encrypt(next_to_last_plaintext_block, next_to_last_plaintext_block,</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  AES_BLOCK_SIZE, aes_key_.get(), local_iv.data(), AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> }</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div>
|
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> } <span class="comment">// namespace media</span></div>
|
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrDecryptor_html_ad8a3e36af755f380c62fd1f058ee678b"><div class="ttname"><a href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b">edash_packager::media::AesCtrDecryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00066">aes_decryptor.cc:66</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcDecryptor_html_a4e949751428f80a05a2093d54ffab7c8"><div class="ttname"><a href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a4e949751428f80a05a2093d54ffab7c8">edash_packager::media::AesCbcDecryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00105">aes_decryptor.cc:105</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrDecryptor_html_aadbe5fbd2984565db8733a0ac0a1e621"><div class="ttname"><a href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#aadbe5fbd2984565db8733a0ac0a1e621">edash_packager::media::AesCtrDecryptor::DecryptInternal</a></div><div class="ttdeci">bool DecryptInternal(const uint8_t *ciphertext, size_t ciphertext_size, uint8_t *plaintext, size_t *plaintext_size) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00071">aes_decryptor.cc:71</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcDecryptor_html_a59bac38018c269795c588169e98a5b41"><div class="ttname"><a href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#a59bac38018c269795c588169e98a5b41">edash_packager::media::AesCbcDecryptor::InitializeWithIv</a></div><div class="ttdeci">bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00092">aes_decryptor.cc:92</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesDecryptor_html_ab069c70e1ceb84e7223a09df04af56da"><div class="ttname"><a href="../../d9/d96/classedash__packager_1_1media_1_1AesDecryptor.html#ab069c70e1ceb84e7223a09df04af56da">edash_packager::media::AesDecryptor::DecryptInternal</a></div><div class="ttdeci">virtual bool DecryptInternal(const uint8_t *ciphertext, size_t ciphertext_size, uint8_t *plaintext, size_t *plaintext_size)=0</div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">edash_packager::media::AesCtrEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00090">aes_encryptor.h:90</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcDecryptor_html_ac663bc4d532e633168f59fe16d9333fc"><div class="ttname"><a href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ac663bc4d532e633168f59fe16d9333fc">edash_packager::media::AesCbcDecryptor::DecryptInternal</a></div><div class="ttdeci">bool DecryptInternal(const uint8_t *ciphertext, size_t ciphertext_size, uint8_t *plaintext, size_t *plaintext_size) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00115">aes_decryptor.cc:115</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcDecryptor_html_ab813a2b1a8f31aa15161c33a686b0908"><div class="ttname"><a href="../../d5/dcb/classedash__packager_1_1media_1_1AesCbcDecryptor.html#ab813a2b1a8f31aa15161c33a686b0908">edash_packager::media::AesCbcDecryptor::AesCbcDecryptor</a></div><div class="ttdeci">AesCbcDecryptor(CbcPaddingScheme padding_scheme, bool chain_across_calls)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00081">aes_decryptor.cc:81</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrDecryptor_html_afe5ed7534a8a187247ede28b6446f071"><div class="ttname"><a href="../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#afe5ed7534a8a187247ede28b6446f071">edash_packager::media::AesCtrDecryptor::InitializeWithIv</a></div><div class="ttdeci">bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../da/df4/aes__decryptor_8cc_source.html#l00060">aes_decryptor.cc:60</a></div></div>
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