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<li class="navelem"><a class="el" href="dir_bc0718b08fb2015b8e59c47b2805f60c.html">libraries</a></li><li class="navelem"><a class="el" href="dir_e2ce51835550ba18edf07a8311722290.html">Crypto</a></li> </ul>
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<div class="title">Crypto.cpp</div> </div>
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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 "Crypto.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keywordtype">void</span> clean(<span class="keywordtype">void</span> *dest, <span class="keywordtype">size_t</span> size)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="comment">// Force the use of volatile so that we actually clear the memory.</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// Otherwise the compiler might optimise the entire contents of this</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">// function away, which will not be secure.</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keyword">volatile</span> uint8_t *d = (<span class="keyword">volatile</span> uint8_t *)dest;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">while</span> (size > 0) {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  *d++ = 0;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  --size;</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> }</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="l00069"></a><span class="lineno"> 69</span> <span class="keywordtype">bool</span> secure_compare(<span class="keyword">const</span> <span class="keywordtype">void</span> *data1, <span class="keyword">const</span> <span class="keywordtype">void</span> *data2, <span class="keywordtype">size_t</span> len)</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>  uint8_t result = 0;</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">const</span> uint8_t *d1 = (<span class="keyword">const</span> uint8_t *)data1;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> uint8_t *d2 = (<span class="keyword">const</span> uint8_t *)data2;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">while</span> (len > 0) {</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  result |= (*d1++ ^ *d2++);</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  --len;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> (<span class="keywordtype">bool</span>)((((uint16_t)0x0100) - result) >> 8);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> }</div>
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