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<div class="title">aes_encryptor.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 2014 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_encryptor.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> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// Increment an 8-byte counter by 1. Return true if overflowed.</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keywordtype">bool</span> Increment64(uint8_t* counter) {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  DCHECK(counter);</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 7; i >= 0; --i)</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordflow">if</span> (++counter[i] != 0)</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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">// According to ISO/IEC FDIS 23001-7: CENC spec, IV should be either</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// 64-bit (8-byte) or 128-bit (16-byte).</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keywordtype">bool</span> IsIvSizeValid(<span class="keywordtype">size_t</span> iv_size) { <span class="keywordflow">return</span> iv_size == 8 || iv_size == 16; }</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">// AES defines three key sizes: 128, 192 and 256 bits.</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="keywordtype">bool</span> IsKeySizeValidForAes(<span class="keywordtype">size_t</span> key_size) {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> key_size == 16 || key_size == 24 || key_size == 32;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// CENC protection scheme uses 128-bit keys in counter mode.</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">const</span> uint32_t kCencKeySize = 16;</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="comment">// namespace</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> AesCtrEncryptor::AesCtrEncryptor()</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  : block_offset_(0),</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  encrypted_counter_(AES_BLOCK_SIZE, 0),</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  counter_overflow_(false) {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  COMPILE_ASSERT(AES_BLOCK_SIZE == kCencKeySize,</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  cenc_key_size_should_be_the_same_as_aes_block_size);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> AesCtrEncryptor::~AesCtrEncryptor() {}</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"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a3d1c0717e1310823bd6827299b6050ef"> 53</a></span> <span class="keywordtype">bool</span> AesCtrEncryptor::InitializeWithRandomIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  uint8_t iv_size) {</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  std::vector<uint8_t> iv(iv_size, 0);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (RAND_bytes(&iv[0], iv_size) != 1) {</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  LOG(ERROR) << <span class="stringliteral">"RAND_bytes failed with error: "</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  << ERR_error_string(ERR_get_error(), NULL);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> InitializeWithIv(key, iv);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> }</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a7e755a2bc06f35c8b3de9a7ab8b538cd"> 64</a></span> <span class="keywordtype">bool</span> AesCtrEncryptor::InitializeWithIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> (key.size() != kCencKeySize) {</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  LOG(ERROR) << <span class="stringliteral">"Invalid key size of "</span> << key.size() << <span class="stringliteral">" for CENC."</span>;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  }</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</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> </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  aes_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], AES_BLOCK_SIZE * 8, aes_key_.get()), 0);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> SetIv(iv);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</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> <span class="keywordtype">bool</span> AesCtrEncryptor::Encrypt(<span class="keyword">const</span> uint8_t* plaintext,</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">size_t</span> plaintext_size,</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  uint8_t* ciphertext) {</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  DCHECK(ciphertext);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  DCHECK(aes_key_);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < plaintext_size; ++i) {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (block_offset_ == 0) {</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  AES_encrypt(&counter_[0], &encrypted_counter_[0], aes_key_.get());</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// As mentioned in ISO/IEC FDIS 23001-7: CENC spec, of the 16 byte counter</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// block, bytes 8 to 15 (i.e. the least significant bytes) are used as a</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// simple 64 bit unsigned integer that is incremented by one for each</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// subsequent block of sample data processed and is kept in network byte</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// order.</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (Increment64(&counter_[8]))</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  counter_overflow_ = <span class="keyword">true</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>  ciphertext[i] = plaintext[i] ^ encrypted_counter_[block_offset_];</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  block_offset_ = (block_offset_ + 1) % AES_BLOCK_SIZE;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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> </div>
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<div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a8310ce3e9ef83a899173bbd1e6ac5583"> 104</a></span> <span class="keywordtype">void</span> AesCtrEncryptor::UpdateIv() {</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  block_offset_ = 0;</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"> 107</span>  <span class="comment">// As recommended in ISO/IEC FDIS 23001-7: CENC spec, for 64-bit (8-byte)</span></div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</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="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// incrementing the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</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="l00111"></a><span class="lineno"> 111</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="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// to the initialization vector of the previous sample.</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (iv_.size() == 8) {</div>
|
|
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  Increment64(&iv_[0]);</div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  counter_ = iv_;</div>
|
|
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  DCHECK_EQ(16u, iv_.size());</div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// Even though the block counter portion of the counter (bytes 8 to 15) is</span></div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// treated as a 64-bit number, it is recommended that the initialization</span></div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// vector is treated as a 128-bit number when calculating the next</span></div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// initialization vector from the previous one. The block counter portion</span></div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// is already incremented by number of blocks, the other 64 bits of the</span></div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// counter (bytes 0 to 7) is incremented here if the block counter portion</span></div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// has overflowed.</span></div>
|
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> (counter_overflow_)</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  Increment64(&counter_[0]);</div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  iv_ = counter_;</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  counter_overflow_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> }</div>
|
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
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<div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a9c68238a73c834fd795d3e4d5e8cfd10"> 133</a></span> <span class="keywordtype">bool</span> AesCtrEncryptor::SetIv(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  }</div>
|
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
|
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  block_offset_ = 0;</div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  counter_ = iv_ = iv;</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> }</div>
|
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
|
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> AesCbcPkcs5Encryptor::AesCbcPkcs5Encryptor() {}</div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> AesCbcPkcs5Encryptor::~AesCbcPkcs5Encryptor() {}</div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#a6a960fa0d83359156cfd6e10167a69e2"> 148</a></span> <span class="keywordtype">bool</span> AesCbcPkcs5Encryptor::InitializeWithIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
|
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  encrypt_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], key.size() * 8, encrypt_key_.get()), 0);</div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#aa9e31be1aef797b9c06e5f3beb524dc8"> 166</a></span> <span class="keywordtype">void</span> AesCbcPkcs5Encryptor::Encrypt(<span class="keyword">const</span> std::string& plaintext,</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  std::string* ciphertext) {</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  DCHECK(ciphertext);</div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  DCHECK(encrypt_key_);</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">// Pad the input with PKCS5 padding.</span></div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> num_padding_bytes =</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  AES_BLOCK_SIZE - (plaintext.size() % AES_BLOCK_SIZE);</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  std::string padded_text = plaintext;</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  padded_text.append(num_padding_bytes, static_cast<char>(num_padding_bytes));</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  ciphertext->resize(padded_text.size());</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  std::vector<uint8_t> iv(iv_);</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  AES_cbc_encrypt(reinterpret_cast<const uint8_t*>(padded_text.data()),</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  reinterpret_cast<uint8_t*>(string_as_array(ciphertext)),</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  padded_text.size(),</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  encrypt_key_.get(),</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> }</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#aca87525a4f8b27efc3e6eefcbe26f55f"> 187</a></span> <span class="keywordtype">bool</span> AesCbcPkcs5Encryptor::SetIv(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> }</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> </div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> AesCbcPkcs5Decryptor::AesCbcPkcs5Decryptor() {}</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> AesCbcPkcs5Decryptor::~AesCbcPkcs5Decryptor() {}</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"><a class="line" href="../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#aaa17492b546264e815971e9f6925a460"> 200</a></span> <span class="keywordtype">bool</span> AesCbcPkcs5Decryptor::InitializeWithIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  decrypt_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  CHECK_EQ(AES_set_decrypt_key(&key[0], key.size() * 8, decrypt_key_.get()), 0);</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> </div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> }</div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"><a class="line" href="../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#a99992a6413029b81074735a74ce392e3"> 218</a></span> <span class="keywordtype">bool</span> AesCbcPkcs5Decryptor::Decrypt(<span class="keyword">const</span> std::string& ciphertext,</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  std::string* plaintext) {</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span> ((ciphertext.size() % AES_BLOCK_SIZE) != 0) {</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  LOG(ERROR) << <span class="stringliteral">"Expecting cipher text size to be multiple of "</span></div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  << AES_BLOCK_SIZE << <span class="stringliteral">", got "</span> << ciphertext.size();</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  DCHECK(plaintext);</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  DCHECK(decrypt_key_);</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  plaintext->resize(ciphertext.size());</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  AES_cbc_encrypt(reinterpret_cast<const uint8_t*>(ciphertext.data()),</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  reinterpret_cast<uint8_t*>(string_as_array(plaintext)),</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  ciphertext.size(),</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  decrypt_key_.get(),</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  &iv_[0],</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="comment">// Strip off PKCS5 padding bytes.</span></div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">const</span> uint8_t num_padding_bytes = (*plaintext)[plaintext->size() - 1];</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">if</span> (num_padding_bytes > AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  LOG(ERROR) << <span class="stringliteral">"Padding length is too large : "</span></div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  << <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(num_padding_bytes);</div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  }</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  plaintext->resize(plaintext->size() - num_padding_bytes);</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> }</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"><a class="line" href="../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#a0944b9d110e89fa9d63b03060059954e"> 248</a></span> <span class="keywordtype">bool</span> AesCbcPkcs5Decryptor::SetIv(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> }</div>
|
|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> </div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> AesCbcCtsEncryptor::AesCbcCtsEncryptor() {}</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> AesCbcCtsEncryptor::~AesCbcCtsEncryptor() {}</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#a5f48de14959ae35fdd9e2e95ab0274b4"> 261</a></span> <span class="keywordtype">bool</span> AesCbcCtsEncryptor::InitializeWithIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
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<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
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<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  }</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  }</div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  encrypt_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], key.size() * 8, encrypt_key_.get()), 0);</div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> </div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  iv_ = iv;</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> }</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> </div>
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<div class="line"><a name="l00279"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#a8bc803d458d2443cb59d20b6d14c3c30"> 279</a></span> <span class="keywordtype">void</span> AesCbcCtsEncryptor::Encrypt(<span class="keyword">const</span> uint8_t* plaintext,</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordtype">size_t</span> size,</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  uint8_t* ciphertext) {</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  DCHECK(ciphertext);</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">if</span> (size < AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="comment">// Don't have a full block, leave unencrypted.</span></div>
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|
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  memcpy(ciphertext, plaintext, size);</div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  std::vector<uint8_t> iv(iv_);</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordtype">size_t</span> residual_block_size = size % AES_BLOCK_SIZE;</div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordtype">size_t</span> cbc_size = size - residual_block_size;</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// Encrypt everything but the residual block using CBC.</span></div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  AES_cbc_encrypt(plaintext,</div>
|
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  ciphertext,</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  cbc_size,</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  encrypt_key_.get(),</div>
|
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  AES_ENCRYPT);</div>
|
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keywordflow">if</span> (residual_block_size == 0) {</div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="comment">// No residual block. No need to do ciphertext stealing.</span></div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  }</div>
|
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
|
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="comment">// Zero-pad the residual block and encrypt using CBC.</span></div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  std::vector<uint8_t> residual_block(plaintext + size - residual_block_size,</div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  plaintext + size);</div>
|
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  residual_block.resize(AES_BLOCK_SIZE, 0);</div>
|
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  AES_cbc_encrypt(&residual_block[0],</div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  &residual_block[0],</div>
|
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  AES_BLOCK_SIZE,</div>
|
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  encrypt_key_.get(),</div>
|
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div>
|
|
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="comment">// Replace the last full block with the zero-padded, encrypted residual block,</span></div>
|
|
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="comment">// and replace the residual block with the equivalent portion of the last full</span></div>
|
|
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="comment">// encrypted block. It may appear that some encrypted bits of the last full</span></div>
|
|
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="comment">// block are lost, but they are not, as they were used as the IV when</span></div>
|
|
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="comment">// encrypting the zero-padded residual block.</span></div>
|
|
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  uint8_t* residual_ciphertext_block = ciphertext + size - residual_block_size;</div>
|
|
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  memcpy(residual_ciphertext_block,</div>
|
|
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  residual_ciphertext_block - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  residual_block_size);</div>
|
|
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  memcpy(residual_ciphertext_block - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  residual_block.data(),</div>
|
|
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  AES_BLOCK_SIZE);</div>
|
|
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> }</div>
|
|
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> </div>
|
|
<div class="line"><a name="l00332"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#acd3e07715507f0edebf92dc14535aa70"> 332</a></span> <span class="keywordtype">void</span> AesCbcCtsEncryptor::Encrypt(<span class="keyword">const</span> std::vector<uint8_t>& plaintext,</div>
|
|
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  std::vector<uint8_t>* ciphertext) {</div>
|
|
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  DCHECK(ciphertext);</div>
|
|
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div>
|
|
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  ciphertext->resize(plaintext.size(), 0);</div>
|
|
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="keywordflow">if</span> (plaintext.empty())</div>
|
|
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> </div>
|
|
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  Encrypt(plaintext.data(), plaintext.size(), &(*ciphertext)[0]);</div>
|
|
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> }</div>
|
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<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div>
|
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<div class="line"><a name="l00343"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#a797a78aad46c2b148398c6d15f2b39e3"> 343</a></span> <span class="keywordtype">bool</span> AesCbcCtsEncryptor::SetIv(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  }</div>
|
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<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> </div>
|
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<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> }</div>
|
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<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
|
|
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> AesCbcCtsDecryptor::AesCbcCtsDecryptor() {}</div>
|
|
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> AesCbcCtsDecryptor::~AesCbcCtsDecryptor() {}</div>
|
|
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div>
|
|
<div class="line"><a name="l00356"></a><span class="lineno"><a class="line" href="../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#a4ae122dc7410cccec81eabbffa7601da"> 356</a></span> <span class="keywordtype">bool</span> AesCbcCtsDecryptor::InitializeWithIv(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
|
|
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
|
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  }</div>
|
|
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  }</div>
|
|
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> </div>
|
|
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  decrypt_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  CHECK_EQ(AES_set_decrypt_key(&key[0], key.size() * 8, decrypt_key_.get()), 0);</div>
|
|
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> </div>
|
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<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
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<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> }</div>
|
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<div class="line"><a name="l00373"></a><span class="lineno"> 373</span> </div>
|
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<div class="line"><a name="l00374"></a><span class="lineno"><a class="line" href="../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#ab4401816a4dbae48500ce4e8f011c511"> 374</a></span> <span class="keywordtype">void</span> AesCbcCtsDecryptor::Decrypt(<span class="keyword">const</span> uint8_t* ciphertext,</div>
|
|
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="keywordtype">size_t</span> size,</div>
|
|
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  uint8_t* plaintext) {</div>
|
|
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  DCHECK(ciphertext);</div>
|
|
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  DCHECK(plaintext);</div>
|
|
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div>
|
|
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keywordflow">if</span> (size < AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  <span class="comment">// Don't have a full block, leave unencrypted.</span></div>
|
|
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  memcpy(plaintext, ciphertext, size);</div>
|
|
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  }</div>
|
|
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> </div>
|
|
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  std::vector<uint8_t> iv(iv_);</div>
|
|
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="keywordtype">size_t</span> residual_block_size = size % AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> </div>
|
|
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordflow">if</span> (residual_block_size == 0) {</div>
|
|
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="comment">// No residual block. No need to do ciphertext stealing.</span></div>
|
|
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  AES_cbc_encrypt(ciphertext,</div>
|
|
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  plaintext,</div>
|
|
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  size,</div>
|
|
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  decrypt_key_.get(),</div>
|
|
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  }</div>
|
|
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span> </div>
|
|
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <span class="comment">// AES-CBC decrypt everything up to the next-to-last full block.</span></div>
|
|
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="keywordtype">size_t</span> cbc_size = size - residual_block_size;</div>
|
|
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keywordflow">if</span> (cbc_size > AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  AES_cbc_encrypt(ciphertext,</div>
|
|
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  plaintext,</div>
|
|
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  cbc_size - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  decrypt_key_.get(),</div>
|
|
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  AES_DECRYPT);</div>
|
|
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  }</div>
|
|
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> </div>
|
|
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <span class="comment">// Determine what the last IV should be so that we can "skip ahead" in the</span></div>
|
|
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="comment">// CBC decryption.</span></div>
|
|
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  std::vector<uint8_t> last_iv(ciphertext + size - residual_block_size,</div>
|
|
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  ciphertext + size);</div>
|
|
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  last_iv.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> </div>
|
|
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="comment">// Decrypt the next-to-last block using the IV determined above. This decrypts</span></div>
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<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="comment">// the residual block bits.</span></div>
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<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  AES_cbc_encrypt(ciphertext + size - residual_block_size - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  plaintext + size - residual_block_size - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  decrypt_key_.get(),</div>
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<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  &last_iv[0],</div>
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<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  AES_DECRYPT);</div>
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<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> </div>
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<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="comment">// Swap back the residual block bits and the next-to-last full block.</span></div>
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<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <span class="keywordflow">if</span> (plaintext == ciphertext) {</div>
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<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  uint8_t* ptr1 = plaintext + size - residual_block_size;</div>
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<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  uint8_t* ptr2 = plaintext + size - residual_block_size - AES_BLOCK_SIZE;</div>
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<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < residual_block_size; ++i) {</div>
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<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  uint8_t temp = *ptr1;</div>
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<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  *ptr1 = *ptr2;</div>
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<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  *ptr2 = temp;</div>
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<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  ++ptr1;</div>
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<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  ++ptr2;</div>
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<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  }</div>
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<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  uint8_t* residual_plaintext_block = plaintext + size - residual_block_size;</div>
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<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  memcpy(residual_plaintext_block,</div>
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<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  residual_plaintext_block - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  residual_block_size);</div>
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<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  memcpy(residual_plaintext_block - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  ciphertext + size - residual_block_size,</div>
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<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  residual_block_size);</div>
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<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  }</div>
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<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> </div>
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<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  <span class="comment">// Decrypt the last full block.</span></div>
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<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  AES_cbc_encrypt(plaintext + size - residual_block_size - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  plaintext + size - residual_block_size - AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  AES_BLOCK_SIZE,</div>
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<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  decrypt_key_.get(),</div>
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<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  &iv[0],</div>
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<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  AES_DECRYPT);</div>
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<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> }</div>
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<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> </div>
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<div class="line"><a name="l00456"></a><span class="lineno"><a class="line" href="../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#a07ead5ae4cff840782578f123a79c5e8"> 456</a></span> <span class="keywordtype">void</span> AesCbcCtsDecryptor::Decrypt(<span class="keyword">const</span> std::vector<uint8_t>& ciphertext,</div>
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<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  std::vector<uint8_t>* plaintext) {</div>
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<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  DCHECK(plaintext);</div>
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<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> </div>
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<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  plaintext->resize(ciphertext.size(), 0);</div>
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<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="keywordflow">if</span> (ciphertext.empty())</div>
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<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div>
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<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  Decrypt(ciphertext.data(), ciphertext.size(), &(*plaintext)[0]);</div>
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<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> }</div>
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<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> </div>
|
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<div class="line"><a name="l00467"></a><span class="lineno"><a class="line" href="../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#abcb9af2123d5ae47b2c89cf3feb67e06"> 467</a></span> <span class="keywordtype">bool</span> AesCbcCtsDecryptor::SetIv(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
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<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
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<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
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<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  }</div>
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<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> </div>
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<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  iv_ = iv;</div>
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<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00475"></a><span class="lineno"> 475</span> }</div>
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<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> </div>
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<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> } <span class="comment">// namespace edash_packager</span></div>
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