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<div class="title">AES128.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) 2015,2018 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="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#if defined(CRYPTO_AES_DEFAULT) || defined(CRYPTO_DOC)</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="classAES128.html#af826ce33301767919bb60f27ad3ff693"> 42</a></span> <a class="code" href="classAES128.html#af826ce33301767919bb60f27ad3ff693">AES128::AES128</a>()</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  rounds = 10;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  schedule = sched;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> }</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> AES128::~AES128()</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>  clean(sched);</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> }</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="classAES128.html#aa871832a156f0ea61b964e489670ae9d"> 57</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classAES128.html#aa871832a156f0ea61b964e489670ae9d">AES128::keySize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> 16;</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> </div>
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<div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="classAES128.html#a42d7548eb5084a2c3e2d5aa5f6f98ba4"> 62</a></span> <span class="keywordtype">bool</span> <a class="code" href="classAES128.html#a42d7548eb5084a2c3e2d5aa5f6f98ba4">AES128::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="l00063"></a><span class="lineno"> 63</span> {</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">if</span> (len != 16)</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// Copy the key itself into the first 16 bytes of the schedule.</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  uint8_t *schedule = sched;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  memcpy(schedule, key, 16);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// Expand the key schedule until we have 176 bytes of expanded key.</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  uint8_t iteration = 1;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  uint8_t n = 16;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  uint8_t w = 4;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">while</span> (n < 176) {</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (w == 4) {</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// Every 16 bytes (4 words) we need to apply the key schedule core.</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  keyScheduleCore(schedule + 16, schedule + 12, iteration);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  schedule[16] ^= schedule[0];</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  schedule[17] ^= schedule[1];</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  schedule[18] ^= schedule[2];</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  schedule[19] ^= schedule[3];</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  ++iteration;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  w = 0;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// Otherwise just XOR the word with the one 16 bytes previous.</span></div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  schedule[16] = schedule[12] ^ schedule[0];</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  schedule[17] = schedule[13] ^ schedule[1];</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  schedule[18] = schedule[14] ^ schedule[2];</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  schedule[19] = schedule[15] ^ schedule[3];</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// Advance to the next word in the schedule.</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  schedule += 4;</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  n += 4;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  ++w;</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> </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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> </div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment">// Helper macros.</span></div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="preprocessor">#define KCORE(n) \</span></div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor"> do { \</span></div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor"> AESCommon::keyScheduleCore(temp, schedule + 12, (n)); \</span></div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="preprocessor"> schedule[0] ^= temp[0]; \</span></div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="preprocessor"> schedule[1] ^= temp[1]; \</span></div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="preprocessor"> schedule[2] ^= temp[2]; \</span></div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="preprocessor"> schedule[3] ^= temp[3]; \</span></div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="preprocessor"> } while (0)</span></div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="preprocessor"></span><span class="preprocessor">#define KXOR(a, b) \</span></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="preprocessor"> do { \</span></div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor"> schedule[(a) * 4] ^= schedule[(b) * 4]; \</span></div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor"> schedule[(a) * 4 + 1] ^= schedule[(b) * 4 + 1]; \</span></div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor"> schedule[(a) * 4 + 2] ^= schedule[(b) * 4 + 2]; \</span></div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor"> schedule[(a) * 4 + 3] ^= schedule[(b) * 4 + 3]; \</span></div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="preprocessor"> } while (0)</span></div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00152"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a24682489d5af52f16c7ba2bc4b1116e8"> 152</a></span> <a class="code" href="classAESTiny128.html#a24682489d5af52f16c7ba2bc4b1116e8">AESTiny128::AESTiny128</a>()</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> {</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> }</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> AESTiny128::~AESTiny128()</div>
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<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>  clean(schedule);</div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> }</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
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<div class="line"><a name="l00165"></a><span class="lineno"><a class="line" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e"> 165</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e">AESTiny128::blockSize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">return</span> 16;</div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> }</div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div>
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<div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a6ff732873f0df88d93c3f7df1fb7a168"> 174</a></span> <span class="keywordtype">size_t</span> <a class="code" href="classAESTiny128.html#a6ff732873f0df88d93c3f7df1fb7a168">AESTiny128::keySize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> 16;</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> }</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
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<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a475b147be367e6053ff64e30bf79694c"> 179</a></span> <span class="keywordtype">bool</span> <a class="code" href="classAESTiny128.html#a475b147be367e6053ff64e30bf79694c">AESTiny128::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="l00180"></a><span class="lineno"> 180</span> {</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (len == 16) {</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="comment">// Make a copy of the key - it will be expanded in encryptBlock().</span></div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  memcpy(schedule, key, 16);</div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  }</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> }</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
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<div class="line"><a name="l00189"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3"> 189</a></span> <span class="keywordtype">void</span> <a class="code" href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3">AESTiny128::encryptBlock</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input)</div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> {</div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  uint8_t schedule[16];</div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  uint8_t posn;</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  uint8_t round;</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  uint8_t state1[16];</div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  uint8_t state2[16];</div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  uint8_t temp[4];</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> </div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="comment">// Start with the key in the schedule buffer.</span></div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  memcpy(schedule, this->schedule, 16);</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// Copy the input into the state and XOR with the key schedule.</span></div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  state1[posn] = input[posn] ^ schedule[posn];</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="comment">// Perform the first 9 rounds of the cipher.</span></div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">for</span> (round = 1; round <= 9; ++round) {</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="comment">// Expand the next 16 bytes of the key schedule.</span></div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  KCORE(round);</div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  KXOR(1, 0);</div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  KXOR(2, 1);</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  KXOR(3, 2);</div>
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<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// Encrypt using the key schedule.</span></div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  AESCommon::subBytesAndShiftRows(state2, state1);</div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  AESCommon::mixColumn(state1, state2);</div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  AESCommon::mixColumn(state1 + 4, state2 + 4);</div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  AESCommon::mixColumn(state1 + 8, state2 + 8);</div>
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<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  AESCommon::mixColumn(state1 + 12, state2 + 12);</div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  state1[posn] ^= schedule[posn];</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> </div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">// Expand the final 16 bytes of the key schedule.</span></div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  KCORE(10);</div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  KXOR(1, 0);</div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  KXOR(2, 1);</div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  KXOR(3, 2);</div>
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<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">// Perform the final round.</span></div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  AESCommon::subBytesAndShiftRows(state2, state1);</div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  output[posn] = state2[posn] ^ schedule[posn];</div>
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<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> }</div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div>
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<div class="line"><a name="l00235"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a631c417a0f12c7e43f633c555b950182"> 235</a></span> <span class="keywordtype">void</span> <a class="code" href="classAESTiny128.html#a631c417a0f12c7e43f633c555b950182">AESTiny128::decryptBlock</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input)</div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> {</div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="comment">// Decryption is not supported by AESTiny128.</span></div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> }</div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div>
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<div class="line"><a name="l00240"></a><span class="lineno"><a class="line" href="classAESTiny128.html#a17e56d025f9e55041150953d8561c793"> 240</a></span> <span class="keywordtype">void</span> <a class="code" href="classAESTiny128.html#a17e56d025f9e55041150953d8561c793">AESTiny128::clear</a>()</div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> {</div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  clean(schedule);</div>
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<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> }</div>
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<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
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<div class="line"><a name="l00271"></a><span class="lineno"><a class="line" href="classAESSmall128.html#abfa3d897d55524dadb1afbdc45eaed5e"> 271</a></span> <a class="code" href="classAESSmall128.html#abfa3d897d55524dadb1afbdc45eaed5e">AESSmall128::AESSmall128</a>()</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> {</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> }</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> AESSmall128::~AESSmall128()</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> {</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  clean(reverse);</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"> 279</span> </div>
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<div class="line"><a name="l00280"></a><span class="lineno"><a class="line" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5"> 280</a></span> <span class="keywordtype">bool</span> <a class="code" href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5">AESSmall128::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="l00281"></a><span class="lineno"> 281</span> {</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  uint8_t *schedule;</div>
|
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  uint8_t round;</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  uint8_t temp[4];</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="comment">// Set the encryption key first.</span></div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> (!<a class="code" href="classAESTiny128.html#a475b147be367e6053ff64e30bf79694c">AESTiny128::setKey</a>(key, len))</div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span> <span class="keyword">false</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>  <span class="comment">// Expand the key schedule up to the last round which gives</span></div>
|
|
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="comment">// us the round keys to use for the final two rounds. We can</span></div>
|
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="comment">// then work backwards from there in decryptBlock().</span></div>
|
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  schedule = reverse;</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  memcpy(schedule, key, 16);</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">for</span> (round = 1; round <= 10; ++round) {</div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  KCORE(round);</div>
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  KXOR(1, 0);</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  KXOR(2, 1);</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  KXOR(3, 2);</div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  }</div>
|
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<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div>
|
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="comment">// Key is ready to go.</span></div>
|
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</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"><a class="line" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26"> 306</a></span> <span class="keywordtype">void</span> <a class="code" href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26">AESSmall128::decryptBlock</a>(uint8_t *output, <span class="keyword">const</span> uint8_t *input)</div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> {</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  uint8_t schedule[16];</div>
|
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  uint8_t round;</div>
|
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  uint8_t posn;</div>
|
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  uint8_t state1[16];</div>
|
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  uint8_t state2[16];</div>
|
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  uint8_t temp[4];</div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
|
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="comment">// Start with the end of the decryption schedule.</span></div>
|
|
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  memcpy(schedule, reverse, 16);</div>
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<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div>
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<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="comment">// Copy the input into the state and reverse the final round.</span></div>
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<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
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<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  state1[posn] = input[posn] ^ schedule[posn];</div>
|
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<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  AESCommon::inverseShiftRowsAndSubBytes(state2, state1);</div>
|
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<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  KXOR(3, 2);</div>
|
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<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  KXOR(2, 1);</div>
|
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<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  KXOR(1, 0);</div>
|
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<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  KCORE(10);</div>
|
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<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> </div>
|
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<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="comment">// Perform the next 9 rounds of the decryption process.</span></div>
|
|
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="keywordflow">for</span> (round = 9; round >= 1; --round) {</div>
|
|
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <span class="comment">// Decrypt using the key schedule.</span></div>
|
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<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
|
|
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  state2[posn] ^= schedule[posn];</div>
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<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  AESCommon::inverseMixColumn(state1, state2);</div>
|
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<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  AESCommon::inverseMixColumn(state1 + 4, state2 + 4);</div>
|
|
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  AESCommon::inverseMixColumn(state1 + 8, state2 + 8);</div>
|
|
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  AESCommon::inverseMixColumn(state1 + 12, state2 + 12);</div>
|
|
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  AESCommon::inverseShiftRowsAndSubBytes(state2, state1);</div>
|
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<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> </div>
|
|
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="comment">// Expand the next 16 bytes of the key schedule in reverse.</span></div>
|
|
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  KXOR(3, 2);</div>
|
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<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  KXOR(2, 1);</div>
|
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<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  KXOR(1, 0);</div>
|
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<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  KCORE(round);</div>
|
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<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  }</div>
|
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<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> </div>
|
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<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="comment">// Reverse the initial round and create the output words.</span></div>
|
|
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <span class="keywordflow">for</span> (posn = 0; posn < 16; ++posn)</div>
|
|
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  output[posn] = state2[posn] ^ schedule[posn];</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> </div>
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<div class="line"><a name="l00350"></a><span class="lineno"><a class="line" href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d"> 350</a></span> <span class="keywordtype">void</span> <a class="code" href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d">AESSmall128::clear</a>()</div>
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<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>  clean(reverse);</div>
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<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <a class="code" href="classAESTiny128.html#a17e56d025f9e55041150953d8561c793">AESTiny128::clear</a>();</div>
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<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> }</div>
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<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div>
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<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="preprocessor">#endif // CRYPTO_AES_DEFAULT</span></div>
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<div class="ttc" id="classAESTiny128_html_a6ff732873f0df88d93c3f7df1fb7a168"><div class="ttname"><a href="classAESTiny128.html#a6ff732873f0df88d93c3f7df1fb7a168">AESTiny128::keySize</a></div><div class="ttdeci">size_t keySize() const </div><div class="ttdoc">Size of a 128-bit AES key in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00174">AES128.cpp:174</a></div></div>
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<div class="ttc" id="classAESTiny128_html_a17e56d025f9e55041150953d8561c793"><div class="ttname"><a href="classAESTiny128.html#a17e56d025f9e55041150953d8561c793">AESTiny128::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears all security-sensitive state from this block cipher. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00240">AES128.cpp:240</a></div></div>
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<div class="ttc" id="classAESSmall128_html_aabdb20c638b2107b5b5e3e41dc6dae26"><div class="ttname"><a href="classAESSmall128.html#aabdb20c638b2107b5b5e3e41dc6dae26">AESSmall128::decryptBlock</a></div><div class="ttdeci">void decryptBlock(uint8_t *output, const uint8_t *input)</div><div class="ttdoc">Decrypts a single block using this cipher. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00306">AES128.cpp:306</a></div></div>
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<div class="ttc" id="classAESTiny128_html_a9e343baf2c3c815f8482222c52ebb3a3"><div class="ttname"><a href="classAESTiny128.html#a9e343baf2c3c815f8482222c52ebb3a3">AESTiny128::encryptBlock</a></div><div class="ttdeci">void encryptBlock(uint8_t *output, const uint8_t *input)</div><div class="ttdoc">Encrypts a single block using this cipher. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00189">AES128.cpp:189</a></div></div>
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<div class="ttc" id="classAES128_html_aa871832a156f0ea61b964e489670ae9d"><div class="ttname"><a href="classAES128.html#aa871832a156f0ea61b964e489670ae9d">AES128::keySize</a></div><div class="ttdeci">size_t keySize() const </div><div class="ttdoc">Size of a 128-bit AES key in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00057">AES128.cpp:57</a></div></div>
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<div class="ttc" id="classAESTiny128_html_a631c417a0f12c7e43f633c555b950182"><div class="ttname"><a href="classAESTiny128.html#a631c417a0f12c7e43f633c555b950182">AESTiny128::decryptBlock</a></div><div class="ttdeci">void decryptBlock(uint8_t *output, const uint8_t *input)</div><div class="ttdoc">Decrypts a single block using this cipher. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00235">AES128.cpp:235</a></div></div>
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<div class="ttc" id="classAESSmall128_html_a215b28599d388c2149aba2206d40863d"><div class="ttname"><a href="classAESSmall128.html#a215b28599d388c2149aba2206d40863d">AESSmall128::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Clears all security-sensitive state from this block cipher. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00350">AES128.cpp:350</a></div></div>
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<div class="ttc" id="classAES128_html_a42d7548eb5084a2c3e2d5aa5f6f98ba4"><div class="ttname"><a href="classAES128.html#a42d7548eb5084a2c3e2d5aa5f6f98ba4">AES128::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="AES128_8cpp_source.html#l00062">AES128.cpp:62</a></div></div>
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<div class="ttc" id="classAESTiny128_html_ad00941c5ed48c413b30636420fd42a2e"><div class="ttname"><a href="classAESTiny128.html#ad00941c5ed48c413b30636420fd42a2e">AESTiny128::blockSize</a></div><div class="ttdeci">size_t blockSize() const </div><div class="ttdoc">Size of an AES block in bytes. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00165">AES128.cpp:165</a></div></div>
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<div class="ttc" id="classAESTiny128_html_a24682489d5af52f16c7ba2bc4b1116e8"><div class="ttname"><a href="classAESTiny128.html#a24682489d5af52f16c7ba2bc4b1116e8">AESTiny128::AESTiny128</a></div><div class="ttdeci">AESTiny128()</div><div class="ttdoc">Constructs an AES 128-bit block cipher with no initial key. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00152">AES128.cpp:152</a></div></div>
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<div class="ttc" id="classAESTiny128_html_a475b147be367e6053ff64e30bf79694c"><div class="ttname"><a href="classAESTiny128.html#a475b147be367e6053ff64e30bf79694c">AESTiny128::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="AES128_8cpp_source.html#l00179">AES128.cpp:179</a></div></div>
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<div class="ttc" id="classAES128_html_af826ce33301767919bb60f27ad3ff693"><div class="ttname"><a href="classAES128.html#af826ce33301767919bb60f27ad3ff693">AES128::AES128</a></div><div class="ttdeci">AES128()</div><div class="ttdoc">Constructs an AES 128-bit block cipher with no initial key. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00042">AES128.cpp:42</a></div></div>
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<div class="ttc" id="classAESSmall128_html_a6ca13e59f88498c8c3da338e76f47de5"><div class="ttname"><a href="classAESSmall128.html#a6ca13e59f88498c8c3da338e76f47de5">AESSmall128::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="AES128_8cpp_source.html#l00280">AES128.cpp:280</a></div></div>
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<div class="ttc" id="classAESSmall128_html_abfa3d897d55524dadb1afbdc45eaed5e"><div class="ttname"><a href="classAESSmall128.html#abfa3d897d55524dadb1afbdc45eaed5e">AESSmall128::AESSmall128</a></div><div class="ttdeci">AESSmall128()</div><div class="ttdoc">Constructs an AES 128-bit block cipher with no initial key. </div><div class="ttdef"><b>Definition:</b> <a href="AES128_8cpp_source.html#l00271">AES128.cpp:271</a></div></div>
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