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<div class="title">aes_cryptor.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 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 "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/base/stl_util.h"</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="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> AesCryptor::AesCryptor() : aes_key_(new AES_KEY) {}</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> AesCryptor::~AesCryptor() {}</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</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="l00023"></a><span class="lineno"> 23</span>  std::vector<uint8_t>* crypt_text) {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</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="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// next statement will update the text size.</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</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="l00027"></a><span class="lineno"> 27</span>  crypt_text->resize(text_size + NumPaddingBytes(text_size));</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordtype">size_t</span> crypt_text_size = crypt_text->size();</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">if</span> (!CryptInternal(text.data(), text_size, crypt_text->data(),</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  &crypt_text_size)) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  DCHECK_LE(crypt_text_size, crypt_text->size());</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  crypt_text->resize(crypt_text_size);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> }</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::string& text, std::string* crypt_text) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</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="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// next statement will update the text size.</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</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="l00042"></a><span class="lineno"> 42</span>  crypt_text->resize(text_size + NumPaddingBytes(text_size));</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">size_t</span> crypt_text_size = crypt_text->size();</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">if</span> (!CryptInternal(reinterpret_cast<const uint8_t*>(text.data()), text_size,</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  reinterpret_cast<uint8_t*>(string_as_array(crypt_text)),</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  &crypt_text_size))</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> <span class="keyword">false</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">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="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// No padding by default.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</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"><a class="line" href="../../d9/d60/classedash__packager_1_1media_1_1AesCryptor.html#a0fccd9fe2270f0c584ff1f6c5dd6bd91"> 58</a></span> <span class="keywordtype">bool</span> AesCryptor::GenerateRandomIv(FourCC protection_scheme,</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  std::vector<uint8_t>* iv) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</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="l00061"></a><span class="lineno"> 61</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="l00062"></a><span class="lineno"> 62</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="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// but 16-byte provides better security.</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> iv_size =</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  (protection_scheme == FOURCC_cenc || protection_scheme == FOURCC_cens)</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  ? 8</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  : 16;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  iv->resize(iv_size);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (RAND_bytes(iv->data(), iv_size) != 1) {</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  LOG(ERROR) << <span class="stringliteral">"RAND_bytes failed with error: "</span></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  << ERR_error_string(ERR_get_error(), NULL);</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  }</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</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> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
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