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<div class="title">aes_encryptor.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2014 Google Inc. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// license that can be found in the LICENSE file or at</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// AES Encryptor implementation using openssl.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#ifndef MEDIA_BASE_AES_ENCRYPTOR_H_</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define MEDIA_BASE_AES_ENCRYPTOR_H_</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;packager/base/macros.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &quot;packager/base/memory/scoped_ptr.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/aes_cryptor.h&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">namespace </span>edash_packager {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="line" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html"> 22</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html">AesCryptor</a> {</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a>();</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; ~<a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a49631d3d3d834bf7d78e0d51d7b33651">InitializeWithRandomIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; key, uint8_t iv_size);</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6fc9c04be119f35fb0557f6f348be4f9">InitializeWithIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; key,</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a>);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;};</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="comment">// Class which implements AES-CTR counter-mode encryption.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html"> 42</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a> {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>();</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; ~<a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordtype">void</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db">UpdateIv</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">SetIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; uint32_t block_offset()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> block_offset_; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordtype">bool</span> CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordtype">size_t</span> plaintext_size,</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; uint8_t* ciphertext,</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="keywordtype">size_t</span>* ciphertext_size) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="comment">// Current block offset.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; uint32_t block_offset_;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="comment">// Current AES-CTR counter.</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; std::vector&lt;uint8_t&gt; counter_;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="comment">// Encrypted counter.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; std::vector&lt;uint8_t&gt; encrypted_counter_;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="comment">// Keep track of whether the counter has overflowed.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordtype">bool</span> counter_overflow_;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>);</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;};</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="keyword">enum</span> CbcPaddingScheme {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; kNoPadding,</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; kPkcs5Padding,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; kCtsPadding,</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;};</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="keyword">const</span> <span class="keywordtype">bool</span> kChainAcrossCalls = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;<span class="comment">// Class which implements AES-CBC (Cipher block chaining) encryption.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html"> 87</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">AesEncryptor</a> {</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#a36366598b1550470f167bec1ee0ff640">AesCbcEncryptor</a>(CbcPaddingScheme padding_scheme, <span class="keywordtype">bool</span> chain_across_calls);</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; ~<a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keywordtype">void</span> <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ac075650788539c041b465aff6356a2b9">UpdateIv</a>() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html#ab5436c698f7691f2558514088559dc7e">SetIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; <a class="code" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a049b4b415e44428c4543f7e2f7b36b34">iv</a>) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="keywordtype">bool</span> CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordtype">size_t</span> plaintext_size,</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; uint8_t* ciphertext,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keywordtype">size_t</span>* ciphertext_size) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordtype">size_t</span> NumPaddingBytes(<span class="keywordtype">size_t</span> size) <span class="keyword">const override</span>;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keyword">const</span> CbcPaddingScheme padding_scheme_;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keyword">const</span> <span class="keywordtype">bool</span> chain_across_calls_;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a>);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;};</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;} <span class="comment">// namespace edash_packager</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;<span class="preprocessor">#endif // MEDIA_BASE_AES_ENCRYPTOR_H_</span></div>
<div class="ttc" id="classedash__packager_1_1media_1_1AesCryptor_html"><div class="ttname"><a href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html">edash_packager::media::AesCryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00024">aes_cryptor.h:24</a></div></div>
<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#l00160">aes_encryptor.cc:160</a></div></div>
<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&lt; uint8_t &gt; &amp;key, const std::vector&lt; uint8_t &gt; &amp;iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00054">aes_encryptor.cc:54</a></div></div>
<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#l00073">aes_encryptor.cc:73</a></div></div>
<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&lt; uint8_t &gt; &amp;iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00103">aes_encryptor.cc:103</a></div></div>
<div class="ttc" id="classedash__packager_1_1media_1_1AesEncryptor_html"><div class="ttname"><a href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html">edash_packager::media::AesEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00022">aes_encryptor.h:22</a></div></div>
<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#l00042">aes_encryptor.h:42</a></div></div>
<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&lt; uint8_t &gt; &amp;iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00170">aes_encryptor.cc:170</a></div></div>
<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#l00149">aes_encryptor.cc:149</a></div></div>
<div class="ttc" id="classedash__packager_1_1media_1_1AesEncryptor_html_a49631d3d3d834bf7d78e0d51d7b33651"><div class="ttname"><a href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a49631d3d3d834bf7d78e0d51d7b33651">edash_packager::media::AesEncryptor::InitializeWithRandomIv</a></div><div class="ttdeci">bool InitializeWithRandomIv(const std::vector&lt; uint8_t &gt; &amp;key, uint8_t iv_size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00043">aes_encryptor.cc:43</a></div></div>
<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&lt; uint8_t &gt; &amp; iv() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00059">aes_cryptor.h:59</a></div></div>
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcEncryptor_html"><div class="ttname"><a href="../../da/d7f/classedash__packager_1_1media_1_1AesCbcEncryptor.html">edash_packager::media::AesCbcEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00087">aes_encryptor.h:87</a></div></div>
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