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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">Curve25519.h</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">#ifndef CRYPTO_CURVE25519_h</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor"></span><span class="preprocessor">#define CRYPTO_CURVE25519_h</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "BigNumberUtil.h"</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">class </span><a class="code" href="classEd25519.html">Ed25519</a>;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="classCurve25519.html"> 30</a></span> <span class="keyword">class </span><a class="code" href="classCurve25519.html">Curve25519</a></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="classCurve25519.html#a2e4b7dd83a019b32c76584c99bfda21a">eval</a>(uint8_t result[32], <span class="keyword">const</span> uint8_t s[32], <span class="keyword">const</span> uint8_t x[32]);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="classCurve25519.html#a2b6911583d17ea9a36bbbb40d58b3d89">dh1</a>(uint8_t k[32], uint8_t f[32]);</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="classCurve25519.html#a14022d6ac68ec691ffb0247275078ab9">dh2</a>(uint8_t k[32], uint8_t f[32]);</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#if defined(TEST_CURVE25519_FIELD_OPS)</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor"></span><span class="keyword">public</span>:</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor"></span><span class="keyword">private</span>:</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor"></span> <span class="keyword">static</span> uint8_t isWeakPoint(<span class="keyword">const</span> uint8_t k[32]);</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>  <span class="keyword">static</span> <span class="keywordtype">void</span> reduce(limb_t *result, limb_t *x, uint8_t size);</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">static</span> limb_t reduceQuick(limb_t *x);</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>  <span class="keyword">static</span> <span class="keywordtype">void</span> mulNoReduce(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keyword">const</span> limb_t *y);</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>  <span class="keyword">static</span> <span class="keywordtype">void</span> mul(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keyword">const</span> limb_t *y);</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> square(limb_t *result, <span class="keyword">const</span> limb_t *x)</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  {</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  mul(result, x, x);</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  }</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> mulA24(limb_t *result, <span class="keyword">const</span> limb_t *x);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> mul_P(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keyword">const</span> limb_t *y);</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"> 60</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> add(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keyword">const</span> limb_t *y);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> sub(limb_t *result, <span class="keyword">const</span> limb_t *x, <span class="keyword">const</span> limb_t *y);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> cswap(limb_t select, limb_t *x, limb_t *y);</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> cmove(limb_t select, limb_t *x, <span class="keyword">const</span> limb_t *y);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> pow250(limb_t *result, <span class="keyword">const</span> limb_t *x);</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> recip(limb_t *result, <span class="keyword">const</span> limb_t *x);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">static</span> <span class="keywordtype">bool</span> sqrt(limb_t *result, <span class="keyword">const</span> limb_t *x);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// Constructor and destructor are private - cannot instantiate this class.</span></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="classCurve25519.html">Curve25519</a>() {}</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  ~<a class="code" href="classCurve25519.html">Curve25519</a>() {}</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classEd25519.html">Ed25519</a>;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> };</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#endif</span></div>
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<div class="ttc" id="classCurve25519_html"><div class="ttname"><a href="classCurve25519.html">Curve25519</a></div><div class="ttdoc">Diffie-Hellman key agreement based on the elliptic curve modulo 2^255 - 19. </div><div class="ttdef"><b>Definition:</b> <a href="Curve25519_8h_source.html#l00030">Curve25519.h:30</a></div></div>
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<div class="ttc" id="classCurve25519_html_a2e4b7dd83a019b32c76584c99bfda21a"><div class="ttname"><a href="classCurve25519.html#a2e4b7dd83a019b32c76584c99bfda21a">Curve25519::eval</a></div><div class="ttdeci">static bool eval(uint8_t result[32], const uint8_t s[32], const uint8_t x[32])</div><div class="ttdoc">Evaluates the raw Curve25519 function. </div><div class="ttdef"><b>Definition:</b> <a href="Curve25519_8cpp_source.html#l00080">Curve25519.cpp:80</a></div></div>
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<div class="ttc" id="classEd25519_html"><div class="ttname"><a href="classEd25519.html">Ed25519</a></div><div class="ttdoc">Digital signatures based on the elliptic curve modulo 2^255 - 19. </div><div class="ttdef"><b>Definition:</b> <a href="Ed25519_8h_source.html#l00029">Ed25519.h:29</a></div></div>
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<div class="ttc" id="classCurve25519_html_a2b6911583d17ea9a36bbbb40d58b3d89"><div class="ttname"><a href="classCurve25519.html#a2b6911583d17ea9a36bbbb40d58b3d89">Curve25519::dh1</a></div><div class="ttdeci">static void dh1(uint8_t k[32], uint8_t f[32])</div><div class="ttdoc">Performs phase 1 of a Diffie-Hellman key exchange using Curve25519. </div><div class="ttdef"><b>Definition:</b> <a href="Curve25519_8cpp_source.html#l00245">Curve25519.cpp:245</a></div></div>
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<div class="ttc" id="classCurve25519_html_a14022d6ac68ec691ffb0247275078ab9"><div class="ttname"><a href="classCurve25519.html#a14022d6ac68ec691ffb0247275078ab9">Curve25519::dh2</a></div><div class="ttdeci">static bool dh2(uint8_t k[32], uint8_t f[32])</div><div class="ttdoc">Performs phase 2 of a Diffie-Hellman key exchange using Curve25519. </div><div class="ttdef"><b>Definition:</b> <a href="Curve25519_8cpp_source.html#l00283">Curve25519.cpp:283</a></div></div>
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