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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/media/base/aes_cryptor.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno"><a class="line" href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html"> 21</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html">AesEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html">AesCryptor</a> {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keyword">explicit</span> <a class="code" href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html#a873b0794baca91b36dbc484fc9c37e58">AesEncryptor</a>(ConstantIvFlag constant_iv_flag);</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; ~<a class="code" href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html">AesEncryptor</a>() <span class="keyword">override</span>;</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="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html#a0695df5615cadf6977fdbac978daeffa">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="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a96dde16f12a82a563c77f6d5522571f3">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="../../d3/d75/classshaka_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="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html"> 42</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../d3/d75/classshaka_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="../../d0/dd8/classshaka_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="../../d0/dd8/classshaka_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="l00047"></a><span class="lineno"> 47</span>&#160; uint32_t block_offset()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> block_offset_; }</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordtype">bool</span> CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordtype">size_t</span> plaintext_size,</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; uint8_t* ciphertext,</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordtype">size_t</span>* ciphertext_size) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="keywordtype">void</span> SetIvInternal() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// Current block offset.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; uint32_t block_offset_;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="comment">// Current AES-CTR counter.</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; std::vector&lt;uint8_t&gt; counter_;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="comment">// Encrypted counter.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; std::vector&lt;uint8_t&gt; encrypted_counter_;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;};</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="keyword">enum</span> CbcPaddingScheme {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">// Residual block is left unencrypted.</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; kNoPadding,</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="comment">// Residual block is padded with pkcs5 and encrypted.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; kPkcs5Padding,</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="comment">// Residual block and the next-to-last block are encrypted using ciphertext</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="comment">// stealing method.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; kCtsPadding,</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;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="comment">// Class which implements AES-CBC (Cipher block chaining) encryption.</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html"> 77</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a> : <span class="keyword">public</span> <a class="code" href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html">AesEncryptor</a> {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keyword">explicit</span> <a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html#a2cc8f20b92d884d959b3a586b527fece">AesCbcEncryptor</a>(CbcPaddingScheme padding_scheme);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html#a2cc8f20b92d884d959b3a586b527fece">AesCbcEncryptor</a>(CbcPaddingScheme padding_scheme,</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; ConstantIvFlag constant_iv_flag);</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; ~<a class="code" href="../../d4/d20/classshaka_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="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keyword">private</span>:</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keywordtype">bool</span> CryptInternal(<span class="keyword">const</span> uint8_t* plaintext,</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="keywordtype">size_t</span> plaintext_size,</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; uint8_t* ciphertext,</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordtype">size_t</span>* ciphertext_size) <span class="keyword">override</span>;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordtype">void</span> SetIvInternal() <span class="keyword">override</span>;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</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="l00104"></a><span class="lineno"> 104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="keyword">const</span> CbcPaddingScheme padding_scheme_;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="comment">// 16-byte internal iv for crypto operations.</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; std::vector&lt;uint8_t&gt; internal_iv_;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a>);</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;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;} <span class="comment">// namespace shaka</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;<span class="preprocessor">#endif // MEDIA_BASE_AES_ENCRYPTOR_H_</span></div>
<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html">shaka::media::AesCryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00025">aes_cryptor.h:25</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesCbcEncryptor_html_a2cc8f20b92d884d959b3a586b527fece"><div class="ttname"><a href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html#a2cc8f20b92d884d959b3a586b527fece">shaka::media::AesCbcEncryptor::AesCbcEncryptor</a></div><div class="ttdeci">AesCbcEncryptor(CbcPaddingScheme padding_scheme)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00099">aes_encryptor.cc:99</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesEncryptor_html_a0695df5615cadf6977fdbac978daeffa"><div class="ttname"><a href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html#a0695df5615cadf6977fdbac978daeffa">shaka::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#l00039">aes_encryptor.cc:39</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesEncryptor_html_a873b0794baca91b36dbc484fc9c37e58"><div class="ttname"><a href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html#a873b0794baca91b36dbc484fc9c37e58">shaka::media::AesEncryptor::AesEncryptor</a></div><div class="ttdeci">AesEncryptor(ConstantIvFlag constant_iv_flag)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00035">aes_encryptor.cc:35</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesCbcEncryptor_html"><div class="ttname"><a href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">shaka::media::AesCbcEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00077">aes_encryptor.h:77</a></div></div>
<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&lt; uint8_t &gt; &amp; 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>
<div class="ttc" id="classshaka_1_1media_1_1AesCtrEncryptor_html"><div class="ttname"><a href="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html">shaka::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="classshaka_1_1media_1_1AesEncryptor_html"><div class="ttname"><a href="../../d3/d75/classshaka_1_1media_1_1AesEncryptor.html">shaka::media::AesEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00021">aes_encryptor.h:21</a></div></div>
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