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<div class="title">aes_encryptor.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 2014 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_encryptor.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> </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/base/logging.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="keyword">namespace </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="comment">// Increment an 8-byte counter by 1. Return true if overflowed.</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keywordtype">bool</span> Increment64(uint8_t* counter) {</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  DCHECK(counter);</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 7; i >= 0; --i)</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordflow">if</span> (++counter[i] != 0)</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</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="comment">// According to ISO/IEC FDIS 23001-7: CENC spec, IV should be either</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">// 64-bit (8-byte) or 128-bit (16-byte).</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keywordtype">bool</span> IsIvSizeValid(<span class="keywordtype">size_t</span> iv_size) { <span class="keywordflow">return</span> iv_size == 8 || iv_size == 16; }</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</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="l00029"></a><span class="lineno"> 29</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="l00030"></a><span class="lineno"> 30</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="l00031"></a><span class="lineno"> 31</span> }</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> AesEncryptor::AesEncryptor() {}</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> AesEncryptor::~AesEncryptor() {}</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"><a class="line" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6fc9c04be119f35fb0557f6f348be4f9"> 41</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6fc9c04be119f35fb0557f6f348be4f9">AesEncryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  CHECK_EQ(AES_set_encrypt_key(key.data(), key.size() * 8, mutable_aes_key()),</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  0);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a04a5cce8c499ed9a41da6c8f067c63ed">SetIv</a>(iv);</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> }</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> AesCtrEncryptor::AesCtrEncryptor()</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  : block_offset_(0),</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  encrypted_counter_(AES_BLOCK_SIZE, 0),</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  counter_overflow_(false) {}</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> AesCtrEncryptor::~AesCtrEncryptor() {}</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="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db"> 60</a></span> <span class="keywordtype">void</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db">AesCtrEncryptor::UpdateIv</a>() {</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  block_offset_ = 0;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// As recommended in ISO/IEC FDIS 23001-7: CENC spec, for 64-bit (8-byte)</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// IV_Sizes, initialization vectors for subsequent samples can be created by</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// incrementing the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// For 128-bit (16-byte) IV_Sizes, initialization vectors for subsequent</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// samples should be created by adding the block count of the previous sample</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// to the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>().size() == 8) {</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  counter_ = <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>();</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  Increment64(&counter_[0]);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  set_iv(counter_);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  DCHECK_EQ(16u, <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>().size());</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// Even though the block counter portion of the counter (bytes 8 to 15) is</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// treated as a 64-bit number, it is recommended that the initialization</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// vector is treated as a 128-bit number when calculating the next</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">// initialization vector from the previous one. The block counter portion</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// is already incremented by number of blocks, the other 64 bits of the</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// counter (bytes 0 to 7) is incremented here if the block counter portion</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// has overflowed.</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (counter_overflow_)</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  Increment64(&counter_[0]);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  set_iv(counter_);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  counter_overflow_ = <span class="keyword">false</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"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9"> 90</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">AesCtrEncryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  block_offset_ = 0;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  set_iv(iv);</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  counter_ = <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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> </div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="keywordtype">bool</span> AesCtrEncryptor::CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordtype">size_t</span> plaintext_size,</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  uint8_t* ciphertext,</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">size_t</span>* ciphertext_size) {</div>
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|
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  DCHECK(plaintext);</div>
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|
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  DCHECK(ciphertext);</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  DCHECK(aes_key());</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>  <span class="comment">// |ciphertext_size| is always the same as |plaintext_size| for counter mode.</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">if</span> (*ciphertext_size < plaintext_size) {</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  LOG(ERROR) << <span class="stringliteral">"Expecting output size of at least "</span> << plaintext_size</div>
|
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  << <span class="stringliteral">" bytes."</span>;</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  *ciphertext_size = plaintext_size;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < plaintext_size; ++i) {</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">if</span> (block_offset_ == 0) {</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  AES_encrypt(&counter_[0], &encrypted_counter_[0], aes_key());</div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// As mentioned in ISO/IEC FDIS 23001-7: CENC spec, of the 16 byte counter</span></div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// block, bytes 8 to 15 (i.e. the least significant bytes) are used as a</span></div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// simple 64 bit unsigned integer that is incremented by one for each</span></div>
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|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// subsequent block of sample data processed and is kept in network byte</span></div>
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|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">// order.</span></div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">if</span> (Increment64(&counter_[8]))</div>
|
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  counter_overflow_ = <span class="keyword">true</span>;</div>
|
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  ciphertext[i] = plaintext[i] ^ encrypted_counter_[block_offset_];</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  block_offset_ = (block_offset_ + 1) % AES_BLOCK_SIZE;</div>
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|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  }</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> }</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div>
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<div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#a36366598b1550470f167bec1ee0ff640"> 136</a></span> <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#a36366598b1550470f167bec1ee0ff640">AesCbcEncryptor::AesCbcEncryptor</a>(CbcPaddingScheme padding_scheme,</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordtype">bool</span> chain_across_calls)</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  : padding_scheme_(padding_scheme),</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  chain_across_calls_(chain_across_calls) {</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">if</span> (padding_scheme_ != kNoPadding) {</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</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="l00142"></a><span class="lineno"> 142</span>  <span class="stringliteral">"sense if the padding_scheme is kNoPadding."</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> }</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> AesCbcEncryptor::~AesCbcEncryptor() {}</div>
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|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
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<div class="line"><a name="l00147"></a><span class="lineno"><a class="line" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ac075650788539c041b465aff6356a2b9"> 147</a></span> <span class="keywordtype">void</span> <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ac075650788539c041b465aff6356a2b9">AesCbcEncryptor::UpdateIv</a>() {</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">// From CENC spec: CBC mode Initialization Vectors need not be unique per</span></div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// sample or Subsample and may be generated randomly or sequentially, e.g.</span></div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// a per sample IV may be (1) equal to the cipher text of the last encrypted</span></div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// cipher block (a continous cipher block chain across samples), or (2)</span></div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// generated by incrementing the previuos IV by the number of cipher blocks in the last</span></div>
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|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// sample or (3) by a fixed amount. We use method (1) here. No separate IV</span></div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">// update is needed.</span></div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> }</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
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<div class="line"><a name="l00157"></a><span class="lineno"><a class="line" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ab5436c698f7691f2558514088559dc7e"> 157</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ab5436c698f7691f2558514088559dc7e">AesCbcEncryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
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|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div>
|
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  set_iv(iv);</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="keywordtype">bool</span> AesCbcEncryptor::CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordtype">size_t</span> plaintext_size,</div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  uint8_t* ciphertext,</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordtype">size_t</span>* ciphertext_size) {</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  DCHECK(aes_key());</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>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> residual_block_size = plaintext_size % AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> num_padding_bytes = NumPaddingBytes(plaintext_size);</div>
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|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> required_ciphertext_size = plaintext_size + num_padding_bytes;</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">if</span> (*ciphertext_size < required_ciphertext_size) {</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  LOG(ERROR) << <span class="stringliteral">"Expecting output size of at least "</span></div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  << required_ciphertext_size << <span class="stringliteral">" bytes."</span>;</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  }</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  *ciphertext_size = required_ciphertext_size;</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// Encrypt everything but the residual block using CBC.</span></div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> cbc_size = plaintext_size - residual_block_size;</div>
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|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  std::vector<uint8_t> local_iv(<a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>());</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">if</span> (cbc_size != 0) {</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  AES_cbc_encrypt(plaintext, ciphertext, cbc_size, aes_key(), local_iv.data(),</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (padding_scheme_ == kCtsPadding) {</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="comment">// Don't have a full block, leave unencrypted.</span></div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  memcpy(ciphertext, plaintext, plaintext_size);</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">if</span> (residual_block_size == 0 && padding_scheme_ != kPkcs5Padding) {</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">if</span> (chain_across_calls_)</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  set_iv(local_iv);</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="comment">// No residual block. No need to do padding.</span></div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  }</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  DCHECK(!chain_across_calls_);</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (padding_scheme_ == kNoPadding) {</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// The residual block is left unencrypted.</span></div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  memcpy(ciphertext + cbc_size, plaintext + cbc_size, residual_block_size);</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  std::vector<uint8_t> residual_block(plaintext + cbc_size,</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  plaintext + plaintext_size);</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  DCHECK_EQ(residual_block.size(), residual_block_size);</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  uint8_t* residual_ciphertext_block = ciphertext + cbc_size;</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">if</span> (padding_scheme_ == kPkcs5Padding) {</div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  DCHECK_EQ(num_padding_bytes, AES_BLOCK_SIZE - residual_block_size);</div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// Pad residue block with PKCS5 padding.</span></div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  residual_block.resize(AES_BLOCK_SIZE, static_cast<char>(num_padding_bytes));</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  AES_cbc_encrypt(residual_block.data(), residual_ciphertext_block,</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  AES_BLOCK_SIZE, aes_key(), local_iv.data(), AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  DCHECK_EQ(num_padding_bytes, 0u);</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  DCHECK_EQ(padding_scheme_, kCtsPadding);</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="comment">// Zero-pad the residual block and encrypt using CBC.</span></div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  residual_block.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  AES_cbc_encrypt(residual_block.data(), residual_block.data(),</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  AES_BLOCK_SIZE, aes_key(), local_iv.data(), AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// Replace the last full block with the zero-padded, encrypted residual</span></div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">// block, and replace the residual block with the equivalent portion of the</span></div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">// last full encrypted block. It may appear that some encrypted bits of the</span></div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="comment">// last full block are lost, but they are not, as they were used as the IV</span></div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">// when encrypting the zero-padded residual block.</span></div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  memcpy(residual_ciphertext_block,</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  residual_ciphertext_block - AES_BLOCK_SIZE, residual_block_size);</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  memcpy(residual_ciphertext_block - AES_BLOCK_SIZE, residual_block.data(),</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  AES_BLOCK_SIZE);</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  }</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> }</div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="keywordtype">size_t</span> AesCbcEncryptor::NumPaddingBytes(<span class="keywordtype">size_t</span> size)<span class="keyword"> const </span>{</div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">return</span> (padding_scheme_ == kPkcs5Padding)</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  ? (AES_BLOCK_SIZE - (size % AES_BLOCK_SIZE))</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  : 0;</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> }</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> } <span class="comment">// namespace media</span></div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcEncryptor_html_ac075650788539c041b465aff6356a2b9"><div class="ttname"><a href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ac075650788539c041b465aff6356a2b9">edash_packager::media::AesCbcEncryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00147">aes_encryptor.cc:147</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesEncryptor_html_a6fc9c04be119f35fb0557f6f348be4f9"><div class="ttname"><a href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6fc9c04be119f35fb0557f6f348be4f9">edash_packager::media::AesEncryptor::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="../../d5/da4/aes__encryptor_8cc_source.html#l00041">aes_encryptor.cc:41</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html_a27cc6076b6f5edd8c096753ae157a1db"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db">edash_packager::media::AesCtrEncryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00060">aes_encryptor.cc:60</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html_ac70e6553917ad948fb2c18101de0f8d9"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">edash_packager::media::AesCtrEncryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00090">aes_encryptor.cc:90</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCryptor_html_a04a5cce8c499ed9a41da6c8f067c63ed"><div class="ttname"><a href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a04a5cce8c499ed9a41da6c8f067c63ed">edash_packager::media::AesCryptor::SetIv</a></div><div class="ttdeci">virtual bool SetIv(const std::vector< uint8_t > &iv)=0</div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcEncryptor_html_ab5436c698f7691f2558514088559dc7e"><div class="ttname"><a href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ab5436c698f7691f2558514088559dc7e">edash_packager::media::AesCbcEncryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00157">aes_encryptor.cc:157</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcEncryptor_html_a36366598b1550470f167bec1ee0ff640"><div class="ttname"><a href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#a36366598b1550470f167bec1ee0ff640">edash_packager::media::AesCbcEncryptor::AesCbcEncryptor</a></div><div class="ttdeci">AesCbcEncryptor(CbcPaddingScheme padding_scheme, bool chain_across_calls)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00136">aes_encryptor.cc:136</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1AesCryptor_html_a049b4b415e44428c4543f7e2f7b36b34"><div class="ttname"><a href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">edash_packager::media::AesCryptor::iv</a></div><div class="ttdeci">const std::vector< uint8_t > & iv() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00060">aes_cryptor.h:60</a></div></div>
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