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<div class="title">AES256.cpp</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">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2015 Southern Storm Software, Pty Ltd.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * in all copies or substantial portions of the Software.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "AES.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "Crypto.h"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="classAES256.html#a3b2cbe56f03a87ec4260be4f8914fb02"> 40</a></span> <a class="code" href="classAES256.html#a3b2cbe56f03a87ec4260be4f8914fb02">AES256::AES256</a>()</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> {</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  rounds = 14;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  schedule = sched;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> AES256::~AES256()</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  clean(sched);</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="l00055"></a><span class="lineno"><a class="line" href="classAES256.html#af8ed6412bae6fc78274f60344899366a"> 55</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classAES256.html#af8ed6412bae6fc78274f60344899366a">AES256::keySize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> 32;</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"><a class="line" href="classAES256.html#a6af085d2d6a730ff1e025f982121bbda"> 60</a></span> <span class="keywordtype">bool</span> <a class="code" href="classAES256.html#a6af085d2d6a730ff1e025f982121bbda">AES256::setKey</a>(<span class="keyword">const</span> uint8_t *key, <span class="keywordtype">size_t</span> len)</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (len != 32)</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// Copy the key itself into the first 32 bytes of the schedule.</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  uint8_t *schedule = sched;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  memcpy(schedule, key, 32);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// Expand the key schedule until we have 240 bytes of expanded key.</span></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  uint8_t iteration = 1;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  uint8_t n = 32;</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  uint8_t w = 8;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">while</span> (n < 240) {</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span> (w == 8) {</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// Every 32 bytes (8 words) we need to apply the key schedule core.</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  keyScheduleCore(schedule + 32, schedule + 28, iteration);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  schedule[32] ^= schedule[0];</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  schedule[33] ^= schedule[1];</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  schedule[34] ^= schedule[2];</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  schedule[35] ^= schedule[3];</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  ++iteration;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  w = 0;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (w == 4) {</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="comment">// At the 16 byte mark we need to apply the S-box.</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  applySbox(schedule + 32, schedule + 28);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  schedule[32] ^= schedule[0];</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  schedule[33] ^= schedule[1];</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  schedule[34] ^= schedule[2];</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  schedule[35] ^= schedule[3];</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// Otherwise just XOR the word with the one 32 bytes previous.</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  schedule[32] = schedule[28] ^ schedule[0];</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  schedule[33] = schedule[29] ^ schedule[1];</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  schedule[34] = schedule[30] ^ schedule[2];</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  schedule[35] = schedule[31] ^ schedule[3];</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</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>  <span class="comment">// Advance to the next word in the schedule.</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  schedule += 4;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  n += 4;</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  ++w;</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"> 104</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div>
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<div class="ttc" id="classAES256_html_a3b2cbe56f03a87ec4260be4f8914fb02"><div class="ttname"><a href="classAES256.html#a3b2cbe56f03a87ec4260be4f8914fb02">AES256::AES256</a></div><div class="ttdeci">AES256()</div><div class="ttdoc">Constructs an AES 256-bit block cipher with no initial key. </div><div class="ttdef"><b>Definition:</b> <a href="AES256_8cpp_source.html#l00040">AES256.cpp:40</a></div></div>
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<div class="ttc" id="classAES256_html_a6af085d2d6a730ff1e025f982121bbda"><div class="ttname"><a href="classAES256.html#a6af085d2d6a730ff1e025f982121bbda">AES256::setKey</a></div><div class="ttdeci">bool setKey(const uint8_t *key, size_t len)</div><div class="ttdoc">Sets the key to use for future encryption and decryption operations. </div><div class="ttdef"><b>Definition:</b> <a href="AES256_8cpp_source.html#l00060">AES256.cpp:60</a></div></div>
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<div class="ttc" id="classAES256_html_af8ed6412bae6fc78274f60344899366a"><div class="ttname"><a href="classAES256.html#af8ed6412bae6fc78274f60344899366a">AES256::keySize</a></div><div class="ttdeci">size_t keySize() const </div><div class="ttdoc">Size of a 256-bit AES key in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="AES256_8cpp_source.html#l00055">AES256.cpp:55</a></div></div>
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