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<div class="title">aes_cryptor.cc</div> </div>
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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_cryptor.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 <string></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// According to ISO/IEC 23001-7:2016 CENC spec, IV should be either</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// 64-bit (8-byte) or 128-bit (16-byte).</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keywordtype">bool</span> IsIvSizeValid(<span class="keywordtype">size_t</span> iv_size) {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> iv_size == 8 || iv_size == 16;</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> }</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> } <span class="comment">// namespace</span></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="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a47fbdacc296fbddd899c47ec0c17e5e8"> 31</a></span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a47fbdacc296fbddd899c47ec0c17e5e8">AesCryptor::AesCryptor</a>(ConstantIvFlag constant_iv_flag)</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  : aes_key_(new AES_KEY),</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  constant_iv_flag_(constant_iv_flag),</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  num_crypt_bytes_(0) {}</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> AesCryptor::~AesCryptor() {}</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> <span class="keywordtype">bool</span> AesCryptor::Crypt(<span class="keyword">const</span> std::vector<uint8_t>& text,</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  std::vector<uint8_t>* crypt_text) {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// Save text size to make it work for in-place conversion, since the</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// next statement will update the text size.</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> text_size = text.size();</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  crypt_text->resize(text_size + NumPaddingBytes(text_size));</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">size_t</span> crypt_text_size = crypt_text->size();</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (!Crypt(text.data(), text_size, crypt_text->data(), &crypt_text_size)) {</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  DCHECK_LE(crypt_text_size, crypt_text->size());</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  crypt_text->resize(crypt_text_size);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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> <span class="keywordtype">bool</span> AesCryptor::Crypt(<span class="keyword">const</span> std::string& text, std::string* crypt_text) {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// Save text size to make it work for in-place conversion, since the</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// next statement will update the text size.</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> text_size = text.size();</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  crypt_text->resize(text_size + NumPaddingBytes(text_size));</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordtype">size_t</span> crypt_text_size = crypt_text->size();</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (!Crypt(reinterpret_cast<const uint8_t*>(text.data()), text_size,</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  reinterpret_cast<uint8_t*>(&(*crypt_text)[0]), &crypt_text_size))</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  DCHECK_LE(crypt_text_size, crypt_text->size());</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  crypt_text->resize(crypt_text_size);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> <span class="keyword">true</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"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a4875146da4761bb757d6b00132ae6fea"> 67</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a4875146da4761bb757d6b00132ae6fea">AesCryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  }</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  iv_ = <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a96dde16f12a82a563c77f6d5522571f3">iv</a>;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  num_crypt_bytes_ = 0;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  SetIvInternal();</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> }</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a812dfc641212f8eb877ab153de7fbb37"> 78</a></span> <span class="keywordtype">void</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a812dfc641212f8eb877ab153de7fbb37">AesCryptor::UpdateIv</a>() {</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">if</span> (constant_iv_flag_ == kUseConstantIv)</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  uint64_t increment = 0;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// As recommended in ISO/IEC 23001-7:2016 CENC spec, for 64-bit (8-byte)</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</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="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// incrementing the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</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="l00087"></a><span class="lineno"> 87</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="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// to the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// There is no official recommendation of how IV for next sample should be</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// generated for CBC mode. We use the same generation algorithm as CTR here.</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">if</span> (iv_.size() == 8) {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  increment = 1;</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  DCHECK_EQ(16u, iv_.size());</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  increment = (num_crypt_bytes_ + AES_BLOCK_SIZE - 1) / AES_BLOCK_SIZE;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = iv_.size() - 1; increment > 0 && i >= 0; --i) {</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  increment += iv_[i];</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  iv_[i] = increment & 0xFF;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  increment >>= 8;</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>  num_crypt_bytes_ = 0;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  SetIvInternal();</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div>
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<div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd"> 107</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd">AesCryptor::GenerateRandomIv</a>(FourCC protection_scheme,</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  std::vector<uint8_t>* iv) {</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// ISO/IEC 23001-7:2016 10.1 and 10.3 For 'cenc' and 'cens'</span></div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// default_Per_Sample_IV_Size and Per_Sample_IV_Size SHOULD be 8-bytes.</span></div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// There is no official guideline on the iv size for 'cbc1' and 'cbcs',</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// but 16-byte provides better security.</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> iv_size =</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  (protection_scheme == FOURCC_cenc || protection_scheme == FOURCC_cens)</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  ? 8</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  : 16;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  iv->resize(iv_size);</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span> (RAND_bytes(iv->data(), iv_size) != 1) {</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  LOG(ERROR) << <span class="stringliteral">"RAND_bytes failed with error: "</span></div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  << ERR_error_string(ERR_get_error(), NULL);</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  }</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> }</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="keywordtype">size_t</span> AesCryptor::NumPaddingBytes(<span class="keywordtype">size_t</span> size)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// No padding by default.</span></div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">return</span> 0;</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> </div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a812dfc641212f8eb877ab153de7fbb37"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a812dfc641212f8eb877ab153de7fbb37">shaka::media::AesCryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv()</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d55/aes__cryptor_8cc_source.html#l00078">aes_cryptor.cc:78</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a47fbdacc296fbddd899c47ec0c17e5e8"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a47fbdacc296fbddd899c47ec0c17e5e8">shaka::media::AesCryptor::AesCryptor</a></div><div class="ttdeci">AesCryptor(ConstantIvFlag constant_iv_flag)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d55/aes__cryptor_8cc_source.html#l00031">aes_cryptor.cc:31</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a96dde16f12a82a563c77f6d5522571f3"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a96dde16f12a82a563c77f6d5522571f3">shaka::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#l00081">aes_cryptor.h:81</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a40d9a82d274d6fbaee5346328f11dedd"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd">shaka::media::AesCryptor::GenerateRandomIv</a></div><div class="ttdeci">static bool GenerateRandomIv(FourCC protection_scheme, std::vector< uint8_t > *iv)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d55/aes__cryptor_8cc_source.html#l00107">aes_cryptor.cc:107</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a4875146da4761bb757d6b00132ae6fea"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a4875146da4761bb757d6b00132ae6fea">shaka::media::AesCryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d55/aes__cryptor_8cc_source.html#l00067">aes_cryptor.cc:67</a></div></div>
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