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<div class="title">aes_cryptor.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 2016 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;</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#ifndef PACKAGER_MEDIA_BASE_AES_CRYPTOR_H_</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define PACKAGER_MEDIA_BASE_AES_CRYPTOR_H_</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &lt;string&gt;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;packager/base/macros.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/fourccs.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="keyword">struct </span>aes_key_st;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span>aes_key_st AES_KEY;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment">// AES cryptor interface. Inherited by various AES encryptor and decryptor</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="comment">// implementations.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html"> 25</a></span>&#160;<span class="keyword">class </span><a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html">AesCryptor</a> {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; <span class="keyword">public</span>:</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keyword">enum</span> ConstantIvFlag {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; kUseConstantIv,</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; kDontUseConstantIv,</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; };</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keyword">explicit</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a47fbdacc296fbddd899c47ec0c17e5e8">AesCryptor</a>(ConstantIvFlag constant_iv_flag);</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keyword">virtual</span> ~<a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html">AesCryptor</a>();</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a41954df34b76b04d561892732dd0ec2f">InitializeWithIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; key,</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</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>) = 0;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordtype">bool</span> Crypt(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; text,</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; std::vector&lt;uint8_t&gt;* crypt_text);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordtype">bool</span> Crypt(<span class="keyword">const</span> std::string&amp; text, std::string* crypt_text);</div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#ac5fc6e563807e6fce36c2dd43c928b3e"> 55</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#ac5fc6e563807e6fce36c2dd43c928b3e">Crypt</a>(<span class="keyword">const</span> uint8_t* text, <span class="keywordtype">size_t</span> text_size, uint8_t* crypt_text) {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="keywordtype">size_t</span> crypt_text_size = text_size;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordflow">return</span> Crypt(text, text_size, crypt_text, &amp;crypt_text_size);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keywordtype">bool</span> Crypt(<span class="keyword">const</span> uint8_t* text,</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordtype">size_t</span> text_size,</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; uint8_t* crypt_text,</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordtype">size_t</span>* crypt_text_size) {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">if</span> (constant_iv_flag_ == kUseConstantIv)</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; SetIvInternal();</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; num_crypt_bytes_ += text_size;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">return</span> CryptInternal(text, text_size, crypt_text, crypt_text_size);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; }</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a4875146da4761bb757d6b00132ae6fea">SetIv</a>(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; iv);</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordtype">void</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a812dfc641212f8eb877ab153de7fbb37">UpdateIv</a>();</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a96dde16f12a82a563c77f6d5522571f3"> 81</a></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"> const </span>{ <span class="keywordflow">return</span> iv_; }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a731765982d899509626b4979322db926"> 84</a></span>&#160; <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a731765982d899509626b4979322db926">use_constant_iv</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> constant_iv_flag_ == kUseConstantIv; }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd">GenerateRandomIv</a>(FourCC protection_scheme,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; std::vector&lt;uint8_t&gt;* iv);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keyword">const</span> AES_KEY* aes_key()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> aes_key_.get(); }</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; AES_KEY* mutable_aes_key() { <span class="keywordflow">return</span> aes_key_.get(); }</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="comment">// Internal implementation of crypt function.</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="comment">// |text| points to the input text.</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="comment">// |text_size| is the size of input text.</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="comment">// |crypt_text| points to the output encrypted or decrypted text, depends on</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="comment">// whether it is an encryption or decryption. |text| and |crypt_text| can</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="comment">// point to the same address for in place encryption/decryption.</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="comment">// |crypt_text_size| contains the size of |crypt_text| and it will be updated</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="comment">// to contain the actual encrypted/decrypted size for |crypt_text| on success.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="comment">// Return false if the input |crypt_text_size| is not large enough to hold the</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="comment">// output |crypt_text| or if there is any error in encryption/decryption.</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">bool</span> CryptInternal(<span class="keyword">const</span> uint8_t* text,</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordtype">size_t</span> text_size,</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; uint8_t* crypt_text,</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordtype">size_t</span>* crypt_text_size) = 0;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="comment">// Internal implementation of SetIv, which setup internal iv.</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">void</span> SetIvInternal() = 0;</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; <span class="comment">// |size| specifies the input text size.</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="comment">// Return the number of padding bytes needed.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="comment">// Note: No paddings should be needed except for pkcs5-cbc encryptor.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keyword">virtual</span> <span class="keywordtype">size_t</span> NumPaddingBytes(<span class="keywordtype">size_t</span> size) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="comment">// Openssl AES_KEY.</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; std::unique_ptr&lt;AES_KEY&gt; aes_key_;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="comment">// Indicates whether a constant iv is used. Internal iv will be reset to</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <span class="comment">// |iv_| before calling Crypt if that is the case.</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="keyword">const</span> ConstantIvFlag constant_iv_flag_;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// Initialization vector from by SetIv or InitializeWithIv, with size 8 or 16</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="comment">// bytes.</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; std::vector&lt;uint8_t&gt; iv_;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="comment">// Tracks number of crypt bytes. It is used to calculate how many blocks</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="comment">// should iv advance in UpdateIv(). It will be reset to 0 after iv is updated.</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="keywordtype">size_t</span> num_crypt_bytes_;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; DISALLOW_COPY_AND_ASSIGN(<a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a47fbdacc296fbddd899c47ec0c17e5e8">AesCryptor</a>);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;};</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;} <span class="comment">// namespace shaka</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;<span class="preprocessor">#endif // PACKAGER_MEDIA_BASE_AES_CRYPTOR_H_</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;</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_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>
<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>
<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a41954df34b76b04d561892732dd0ec2f"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a41954df34b76b04d561892732dd0ec2f">shaka::media::AesCryptor::InitializeWithIv</a></div><div class="ttdeci">virtual bool InitializeWithIv(const std::vector&lt; uint8_t &gt; &amp;key, const std::vector&lt; uint8_t &gt; &amp;iv)=0</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_1AesCryptor_html_ac5fc6e563807e6fce36c2dd43c928b3e"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#ac5fc6e563807e6fce36c2dd43c928b3e">shaka::media::AesCryptor::Crypt</a></div><div class="ttdeci">bool Crypt(const uint8_t *text, size_t text_size, uint8_t *crypt_text)</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00055">aes_cryptor.h:55</a></div></div>
<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&lt; uint8_t &gt; *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>
<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&lt; uint8_t &gt; &amp;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>
<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a731765982d899509626b4979322db926"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a731765982d899509626b4979322db926">shaka::media::AesCryptor::use_constant_iv</a></div><div class="ttdeci">bool use_constant_iv() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d42/aes__cryptor_8h_source.html#l00084">aes_cryptor.h:84</a></div></div>
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