429 lines
56 KiB
HTML
429 lines
56 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
|
|
<meta name="generator" content="Doxygen 1.8.6"/>
|
|
<title>DASH Media Packaging SDK: media/base/aes_encryptor.cc Source File</title>
|
|
<link href="../../tabs.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../jquery.js"></script>
|
|
<script type="text/javascript" src="../../dynsections.js"></script>
|
|
<link href="../../search/search.css" rel="stylesheet" type="text/css"/>
|
|
<script type="text/javascript" src="../../search/search.js"></script>
|
|
<script type="text/javascript">
|
|
$(document).ready(function() { searchBox.OnSelectItem(0); });
|
|
</script>
|
|
<link href="../../doxygen.css" rel="stylesheet" type="text/css" />
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 56px;">
|
|
<td style="padding-left: 0.5em;">
|
|
<div id="projectname">DASH Media Packaging SDK
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.6 -->
|
|
<script type="text/javascript">
|
|
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
|
|
</script>
|
|
<div id="navrow1" class="tabs">
|
|
<ul class="tablist">
|
|
<li><a href="../../index.html"><span>Main Page</span></a></li>
|
|
<li><a href="../../namespaces.html"><span>Namespaces</span></a></li>
|
|
<li><a href="../../annotated.html"><span>Classes</span></a></li>
|
|
<li class="current"><a href="../../files.html"><span>Files</span></a></li>
|
|
<li>
|
|
<div id="MSearchBox" class="MSearchBoxInactive">
|
|
<span class="left">
|
|
<img id="MSearchSelect" src="../../search/mag_sel.png"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
alt=""/>
|
|
<input type="text" id="MSearchField" value="Search" accesskey="S"
|
|
onfocus="searchBox.OnSearchFieldFocus(true)"
|
|
onblur="searchBox.OnSearchFieldFocus(false)"
|
|
onkeyup="searchBox.OnSearchFieldChange(event)"/>
|
|
</span><span class="right">
|
|
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="../../search/close.png" alt=""/></a>
|
|
</span>
|
|
</div>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div id="navrow2" class="tabs2">
|
|
<ul class="tablist">
|
|
<li><a href="../../files.html"><span>File List</span></a></li>
|
|
</ul>
|
|
</div>
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerator</a></div>
|
|
|
|
<!-- iframe showing the search results (closed by default) -->
|
|
<div id="MSearchResultsWindow">
|
|
<iframe src="javascript:void(0)" frameborder="0"
|
|
name="MSearchResults" id="MSearchResults">
|
|
</iframe>
|
|
</div>
|
|
|
|
<div id="nav-path" class="navpath">
|
|
<ul>
|
|
<li class="navelem"><a class="el" href="../../dir_39dc0668bd5a501998f94e8b4e546c71.html">media</a></li><li class="navelem"><a class="el" href="../../dir_c6ada2450b25ab5438a4dba6c9b890af.html">base</a></li> </ul>
|
|
</div>
|
|
</div><!-- top -->
|
|
<div class="header">
|
|
<div class="headertitle">
|
|
<div class="title">aes_encryptor.cc</div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
<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>
|
|
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
|
|
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/base/aes_encryptor.h"</span></div>
|
|
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
|
|
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <openssl/aes.h></span></div>
|
|
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <openssl/err.h></span></div>
|
|
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <openssl/rand.h></span></div>
|
|
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
|
|
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
|
|
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
|
|
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>{</div>
|
|
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
|
|
<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>
|
|
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keywordtype">bool</span> Increment64(uint8_t* counter) {</div>
|
|
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  DCHECK(counter);</div>
|
|
<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>
|
|
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordflow">if</span> (++counter[i] != 0)</div>
|
|
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> }</div>
|
|
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> }</div>
|
|
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
|
|
<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>
|
|
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">const</span> uint32_t kCencKeySize = 16;</div>
|
|
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
|
|
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> } <span class="comment">// namespace</span></div>
|
|
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
|
|
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">namespace </span>edash_packager {</div>
|
|
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">namespace </span>media {</div>
|
|
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
|
|
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> AesEncryptor::AesEncryptor() {}</div>
|
|
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> AesEncryptor::~AesEncryptor() {}</div>
|
|
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
|
|
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a49631d3d3d834bf7d78e0d51d7b33651"> 46</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a49631d3d3d834bf7d78e0d51d7b33651">AesEncryptor::InitializeWithRandomIv</a>(</div>
|
|
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  uint8_t iv_size) {</div>
|
|
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  std::vector<uint8_t> iv(iv_size, 0);</div>
|
|
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (RAND_bytes(&iv[0], iv_size) != 1) {</div>
|
|
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  LOG(ERROR) << <span class="stringliteral">"RAND_bytes failed with error: "</span></div>
|
|
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  << ERR_error_string(ERR_get_error(), NULL);</div>
|
|
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
|
|
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">return</span> <a class="code" href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6c225492907f281a7c08a76e012f8ba7">InitializeWithIv</a>(key, iv);</div>
|
|
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> }</div>
|
|
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
|
|
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keywordtype">bool</span> AesEncryptor::Encrypt(<span class="keyword">const</span> std::vector<uint8_t>& plaintext,</div>
|
|
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  std::vector<uint8_t>* ciphertext) {</div>
|
|
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (plaintext.empty())</div>
|
|
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  ciphertext->resize(plaintext.size() + NumPaddingBytes(plaintext.size()));</div>
|
|
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> EncryptData(plaintext.data(), plaintext.size(), ciphertext->data());</div>
|
|
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> }</div>
|
|
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
|
|
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keywordtype">bool</span> AesEncryptor::Encrypt(<span class="keyword">const</span> std::string& plaintext,</div>
|
|
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  std::string* ciphertext) {</div>
|
|
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  ciphertext->resize(plaintext.size() + NumPaddingBytes(plaintext.size()));</div>
|
|
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> EncryptData(reinterpret_cast<const uint8_t*>(plaintext.data()),</div>
|
|
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  plaintext.size(),</div>
|
|
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">reinterpret_cast<</span>uint8_t*<span class="keyword">></span>(string_as_array(ciphertext)));</div>
|
|
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> }</div>
|
|
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
|
|
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> AesCtrEncryptor::AesCtrEncryptor()</div>
|
|
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  : block_offset_(0),</div>
|
|
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  encrypted_counter_(AES_BLOCK_SIZE, 0),</div>
|
|
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  counter_overflow_(false) {</div>
|
|
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  COMPILE_ASSERT(AES_BLOCK_SIZE == kCencKeySize,</div>
|
|
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  cenc_key_size_should_be_the_same_as_aes_block_size);</div>
|
|
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div>
|
|
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div>
|
|
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> AesCtrEncryptor::~AesCtrEncryptor() {}</div>
|
|
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div>
|
|
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a2fa3278643f5d2ef4083a04ad44933f3"> 84</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a2fa3278643f5d2ef4083a04ad44933f3">AesCtrEncryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (key.size() != kCencKeySize) {</div>
|
|
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  LOG(ERROR) << <span class="stringliteral">"Invalid key size of "</span> << key.size() << <span class="stringliteral">" for CENC."</span>;</div>
|
|
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div>
|
|
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
|
|
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  }</div>
|
|
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
|
|
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  aes_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], AES_BLOCK_SIZE * 8, aes_key_.get()), 0);</div>
|
|
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">return</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">SetIv</a>(iv);</div>
|
|
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> }</div>
|
|
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
|
|
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="keywordtype">size_t</span> AesCtrEncryptor::NumPaddingBytes(<span class="keywordtype">size_t</span> size) {</div>
|
|
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> 0;</div>
|
|
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div>
|
|
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
|
|
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keywordtype">bool</span> AesCtrEncryptor::EncryptData(<span class="keyword">const</span> uint8_t* plaintext,</div>
|
|
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordtype">size_t</span> plaintext_size,</div>
|
|
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  uint8_t* ciphertext) {</div>
|
|
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  DCHECK(plaintext);</div>
|
|
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  DCHECK(ciphertext);</div>
|
|
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  DCHECK(aes_key_);</div>
|
|
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
|
|
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < plaintext_size; ++i) {</div>
|
|
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">if</span> (block_offset_ == 0) {</div>
|
|
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  AES_encrypt(&counter_[0], &encrypted_counter_[0], aes_key_.get());</div>
|
|
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">// As mentioned in ISO/IEC FDIS 23001-7: CENC spec, of the 16 byte counter</span></div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// block, bytes 8 to 15 (i.e. the least significant bytes) are used as a</span></div>
|
|
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// simple 64 bit unsigned integer that is incremented by one for each</span></div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// subsequent block of sample data processed and is kept in network byte</span></div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="comment">// order.</span></div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span> (Increment64(&counter_[8]))</div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  counter_overflow_ = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  ciphertext[i] = plaintext[i] ^ encrypted_counter_[block_offset_];</div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  block_offset_ = (block_offset_ + 1) % AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db"> 128</a></span> <span class="keywordtype">void</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db">AesCtrEncryptor::UpdateIv</a>() {</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  block_offset_ = 0;</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// As recommended in ISO/IEC FDIS 23001-7: CENC spec, for 64-bit (8-byte)</span></div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// IV_Sizes, initialization vectors for subsequent samples can be created by</span></div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// incrementing the initialization vector of the previous sample.</span></div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// For 128-bit (16-byte) IV_Sizes, initialization vectors for subsequent</span></div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">// samples should be created by adding the block count of the previous sample</span></div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="comment">// to the initialization vector of the previous sample.</span></div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (iv_.size() == 8) {</div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  Increment64(&iv_[0]);</div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  counter_ = iv_;</div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  DCHECK_EQ(16u, iv_.size());</div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</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="l00144"></a><span class="lineno"> 144</span>  <span class="comment">// treated as a 64-bit number, it is recommended that the initialization</span></div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// vector is treated as a 128-bit number when calculating the next</span></div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">// initialization vector from the previous one. The block counter portion</span></div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">// is already incremented by number of blocks, the other 64 bits of the</span></div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">// counter (bytes 0 to 7) is incremented here if the block counter portion</span></div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// has overflowed.</span></div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (counter_overflow_)</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  Increment64(&counter_[0]);</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  iv_ = counter_;</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>  counter_overflow_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> }</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"><a class="line" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9"> 157</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">AesCtrEncryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (!IsIvSizeValid(iv.size())) {</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  block_offset_ = 0;</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  counter_ = iv_ = iv;</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  counter_.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> }</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> AesCbcPkcs5Encryptor::AesCbcPkcs5Encryptor() {}</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> AesCbcPkcs5Encryptor::~AesCbcPkcs5Encryptor() {}</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#acff7cfca3a800344952a86e13dfad896"> 172</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#acff7cfca3a800344952a86e13dfad896">AesCbcPkcs5Encryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  }</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  }</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  aes_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], key.size() * 8, aes_key_.get()), 0);</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>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> }</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> </div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="keywordtype">size_t</span> AesCbcPkcs5Encryptor::NumPaddingBytes(<span class="keywordtype">size_t</span> size) {</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">return</span> AES_BLOCK_SIZE - (size % AES_BLOCK_SIZE);</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> </div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="keywordtype">bool</span> AesCbcPkcs5Encryptor::EncryptData(<span class="keyword">const</span> uint8_t* plaintext,</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordtype">size_t</span> plaintext_size,</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  uint8_t* ciphertext) {</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  DCHECK(ciphertext);</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  DCHECK(aes_key_);</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// Pad the input with PKCS5 padding.</span></div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// TODO(kqyang): Consider more efficient implementation.</span></div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  memcpy(ciphertext, plaintext, plaintext_size);</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = plaintext_size;</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  i < plaintext_size + NumPaddingBytes(plaintext_size); ++i) {</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  ciphertext[i] = NumPaddingBytes(plaintext_size);</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  std::vector<uint8_t> iv(iv_);</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  AES_cbc_encrypt(ciphertext, ciphertext,</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  plaintext_size + NumPaddingBytes(plaintext_size),</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  aes_key_.get(), &iv[0], AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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> </div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#aab27a1d7244f1dcdd7aa75b0fc1be995"> 215</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#aab27a1d7244f1dcdd7aa75b0fc1be995">AesCbcPkcs5Encryptor::UpdateIv</a>() {}</div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> </div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"><a class="line" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#ad21bb8d1ea5aa49645c9b3476f6bcc8a"> 217</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#ad21bb8d1ea5aa49645c9b3476f6bcc8a">AesCbcPkcs5Encryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> </div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> </div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> AesCbcCtsEncryptor::AesCbcCtsEncryptor() {}</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> AesCbcCtsEncryptor::~AesCbcCtsEncryptor() {}</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ad9f134c35f24ebf4c1877ad76f8622b7"> 230</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ad9f134c35f24ebf4c1877ad76f8622b7">AesCbcCtsEncryptor::InitializeWithIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& key,</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">if</span> (!IsKeySizeValidForAes(key.size())) {</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  LOG(ERROR) << <span class="stringliteral">"Invalid AES key size: "</span> << key.size();</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  }</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  }</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  aes_key_.reset(<span class="keyword">new</span> AES_KEY());</div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  CHECK_EQ(AES_set_encrypt_key(&key[0], key.size() * 8, aes_key_.get()), 0);</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>  iv_ = iv;</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"> 248</span> <span class="keywordtype">size_t</span> AesCbcCtsEncryptor::NumPaddingBytes(<span class="keywordtype">size_t</span> size) {</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">return</span> 0;</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> }</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="keywordtype">bool</span> AesCbcCtsEncryptor::EncryptData(<span class="keyword">const</span> uint8_t* plaintext,</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordtype">size_t</span> size,</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  uint8_t* ciphertext) {</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  DCHECK(plaintext);</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  DCHECK(ciphertext);</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>  <span class="keywordflow">if</span> (size < AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">// Don't have a full block, leave unencrypted.</span></div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  memcpy(ciphertext, plaintext, size);</div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  }</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> </div>
|
|
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  std::vector<uint8_t> iv(iv_);</div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordtype">size_t</span> residual_block_size = size % AES_BLOCK_SIZE;</div>
|
|
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordtype">size_t</span> cbc_size = size - residual_block_size;</div>
|
|
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div>
|
|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="comment">// Encrypt everything but the residual block using CBC.</span></div>
|
|
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  AES_cbc_encrypt(plaintext,</div>
|
|
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  ciphertext,</div>
|
|
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  cbc_size,</div>
|
|
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  aes_key_.get(),</div>
|
|
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">if</span> (residual_block_size == 0) {</div>
|
|
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="comment">// No residual block. No need to do ciphertext stealing.</span></div>
|
|
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  }</div>
|
|
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div>
|
|
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">// Zero-pad the residual block and encrypt using CBC.</span></div>
|
|
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  std::vector<uint8_t> residual_block(plaintext + size - residual_block_size,</div>
|
|
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  plaintext + size);</div>
|
|
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  residual_block.resize(AES_BLOCK_SIZE, 0);</div>
|
|
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  AES_cbc_encrypt(&residual_block[0],</div>
|
|
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  &residual_block[0],</div>
|
|
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  aes_key_.get(),</div>
|
|
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  &iv[0],</div>
|
|
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  AES_ENCRYPT);</div>
|
|
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div>
|
|
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="comment">// Replace the last full block with the zero-padded, encrypted residual block,</span></div>
|
|
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="comment">// and replace the residual block with the equivalent portion of the last full</span></div>
|
|
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="comment">// encrypted block. It may appear that some encrypted bits of the last full</span></div>
|
|
<div class="line"><a name="l00294"></a><span class="lineno"> 294</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="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// encrypting the zero-padded residual block.</span></div>
|
|
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  uint8_t* residual_ciphertext_block = ciphertext + size - residual_block_size;</div>
|
|
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  memcpy(residual_ciphertext_block,</div>
|
|
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  residual_ciphertext_block - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  residual_block_size);</div>
|
|
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  memcpy(residual_ciphertext_block - AES_BLOCK_SIZE,</div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  residual_block.data(),</div>
|
|
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  AES_BLOCK_SIZE);</div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> }</div>
|
|
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div>
|
|
<div class="line"><a name="l00306"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#abd04cf7a533527022735eb79151db262"> 306</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#abd04cf7a533527022735eb79151db262">AesCbcCtsEncryptor::UpdateIv</a>() {}</div>
|
|
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"><a class="line" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ae6df0c4b5a1db50537f74deb36b96292"> 308</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ae6df0c4b5a1db50537f74deb36b96292">AesCbcCtsEncryptor::SetIv</a>(<span class="keyword">const</span> std::vector<uint8_t>& iv) {</div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keywordflow">if</span> (iv.size() != AES_BLOCK_SIZE) {</div>
|
|
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  LOG(ERROR) << <span class="stringliteral">"Invalid IV size: "</span> << iv.size();</div>
|
|
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  }</div>
|
|
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div>
|
|
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  iv_ = iv;</div>
|
|
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> }</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">// namespace media</span></div>
|
|
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> } <span class="comment">// namespace edash_packager</span></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesEncryptor_html_a6c225492907f281a7c08a76e012f8ba7"><div class="ttname"><a href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a6c225492907f281a7c08a76e012f8ba7">edash_packager::media::AesEncryptor::InitializeWithIv</a></div><div class="ttdeci">virtual bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv)=0</div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html_a2fa3278643f5d2ef4083a04ad44933f3"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a2fa3278643f5d2ef4083a04ad44933f3">edash_packager::media::AesCtrEncryptor::InitializeWithIv</a></div><div class="ttdeci">bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00084">aes_encryptor.cc:84</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html_a27cc6076b6f5edd8c096753ae157a1db"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#a27cc6076b6f5edd8c096753ae157a1db">edash_packager::media::AesCtrEncryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00128">aes_encryptor.cc:128</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor_html_acff7cfca3a800344952a86e13dfad896"><div class="ttname"><a href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#acff7cfca3a800344952a86e13dfad896">edash_packager::media::AesCbcPkcs5Encryptor::InitializeWithIv</a></div><div class="ttdeci">bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00172">aes_encryptor.cc:172</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCtrEncryptor_html_ac70e6553917ad948fb2c18101de0f8d9"><div class="ttname"><a href="../../dd/d79/classedash__packager_1_1media_1_1AesCtrEncryptor.html#ac70e6553917ad948fb2c18101de0f8d9">edash_packager::media::AesCtrEncryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00157">aes_encryptor.cc:157</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcCtsEncryptor_html_ae6df0c4b5a1db50537f74deb36b96292"><div class="ttname"><a href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ae6df0c4b5a1db50537f74deb36b96292">edash_packager::media::AesCbcCtsEncryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00308">aes_encryptor.cc:308</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor_html_ad21bb8d1ea5aa49645c9b3476f6bcc8a"><div class="ttname"><a href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#ad21bb8d1ea5aa49645c9b3476f6bcc8a">edash_packager::media::AesCbcPkcs5Encryptor::SetIv</a></div><div class="ttdeci">bool SetIv(const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00217">aes_encryptor.cc:217</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor_html_aab27a1d7244f1dcdd7aa75b0fc1be995"><div class="ttname"><a href="../../d6/dc4/classedash__packager_1_1media_1_1AesCbcPkcs5Encryptor.html#aab27a1d7244f1dcdd7aa75b0fc1be995">edash_packager::media::AesCbcPkcs5Encryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00215">aes_encryptor.cc:215</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesEncryptor_html_a49631d3d3d834bf7d78e0d51d7b33651"><div class="ttname"><a href="../../dc/d92/classedash__packager_1_1media_1_1AesEncryptor.html#a49631d3d3d834bf7d78e0d51d7b33651">edash_packager::media::AesEncryptor::InitializeWithRandomIv</a></div><div class="ttdeci">virtual bool InitializeWithRandomIv(const std::vector< uint8_t > &key, uint8_t iv_size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00046">aes_encryptor.cc:46</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcCtsEncryptor_html_abd04cf7a533527022735eb79151db262"><div class="ttname"><a href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#abd04cf7a533527022735eb79151db262">edash_packager::media::AesCbcCtsEncryptor::UpdateIv</a></div><div class="ttdeci">void UpdateIv() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00306">aes_encryptor.cc:306</a></div></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1AesCbcCtsEncryptor_html_ad9f134c35f24ebf4c1877ad76f8622b7"><div class="ttname"><a href="../../d6/da2/classedash__packager_1_1media_1_1AesCbcCtsEncryptor.html#ad9f134c35f24ebf4c1877ad76f8622b7">edash_packager::media::AesCbcCtsEncryptor::InitializeWithIv</a></div><div class="ttdeci">bool InitializeWithIv(const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/da4/aes__encryptor_8cc_source.html#l00230">aes_encryptor.cc:230</a></div></div>
|
|
</div><!-- fragment --></div><!-- contents -->
|
|
<!-- start footer part -->
|
|
<hr class="footer"/><address class="footer"><small>
|
|
Generated on Fri Mar 18 2016 05:18:21 for DASH Media Packaging SDK by  <a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="../../doxygen.png" alt="doxygen"/>
|
|
</a> 1.8.6
|
|
</small></address>
|
|
</body>
|
|
</html>
|