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<div id="projectname">post quantum cryptography
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<div id="projectbrief">Highly optimized implementation of the NTRUEncrypt algorithm</div>
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<a href="ntru__rnd_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Copyright (C) 2014 FH Bielefeld</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * This file is part of a FH Bielefeld project.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * This library is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * modify it under the terms of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * License as published by the Free Software Foundation; either</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * This library is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * Lesser General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> * You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * License along with this library; if not, write to the Free Software</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment"> * MA 02110-1301 USA</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#include &quot;math.h&quot;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__err_8h.html">ntru_err.h</a>&quot;</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__params_8h.html">ntru_params.h</a>&quot;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__poly_8h.html">ntru_poly.h</a>&quot;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="preprocessor">#include &lt;fmpz_poly.h&gt;</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor">#include &lt;fcntl.h&gt;</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor">#include &lt;unistd.h&gt;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="keywordtype">int</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="rnd_8h.html#ad85ebfb1cb4b4942942213b750812cf0"> 42</a></span>&#160;<a class="code" href="ntru__rnd_8c.html#ad85ebfb1cb4b4942942213b750812cf0">get_rnd_int</a>(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;{</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">&quot;/dev/random&quot;</span>, O_RDONLY);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keywordtype">int</span> rnd_int;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">size_t</span> rnd_len = 0;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keywordflow">while</span> (rnd_len &lt; <span class="keyword">sizeof</span>(rnd_int)) {</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; ssize_t result = read(rnd_data, ((<span class="keywordtype">char</span>*)&amp;rnd_int) + rnd_len,</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keyword">sizeof</span>(rnd_int) - rnd_len);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">if</span> (result &lt; 0)</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <a class="code" href="ntru__err_8h.html#ab0f71521e9bc99beab8ece52bb00341a">NTRU_ABORT</a>(<span class="stringliteral">&quot;Unable to read /dev/random!\n&quot;</span>);</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; rnd_len += result;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; }</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; close(rnd_data);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">return</span> rnd_int;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;}</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="keywordtype">int</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="rnd_8h.html#a99e4820cab7157eb1e16109e21dac81f"> 66</a></span>&#160;<a class="code" href="ntru__rnd_8c.html#a99e4820cab7157eb1e16109e21dac81f">get_urnd_int</a>(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;{</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">&quot;/dev/urandom&quot;</span>, O_RDONLY);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="keywordtype">int</span> rnd_int;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; ssize_t result;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; result = read(rnd_data, ((<span class="keywordtype">char</span>*)&amp;rnd_int),</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keyword">sizeof</span>(rnd_int));</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordflow">if</span> (result &lt; 0)</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <a class="code" href="ntru__err_8h.html#ab0f71521e9bc99beab8ece52bb00341a">NTRU_ABORT</a>(<span class="stringliteral">&quot;Unable to read /dev/urandom!\n&quot;</span>);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; close(rnd_data);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; <span class="keywordflow">return</span> rnd_int;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;}</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="rnd_8h.html#a916a55c609c172ae4e48896032b36e47"> 86</a></span>&#160;<a class="code" href="ntru__rnd_8c.html#a916a55c609c172ae4e48896032b36e47">ntru_get_rnd_tern_poly_num</a>(fmpz_poly_t poly,</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params,</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; uint32_t num_ones,</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; uint32_t num_neg_ones,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordtype">int</span> (*rnd_int)(<span class="keywordtype">void</span>))</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;{</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keywordflow">if</span> (!poly || ! params)</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <a class="code" href="ntru__err_8h.html#a5d4dd1c1539c408c0dcd915750e8f224">NTRU_ABORT_DEBUG</a>(<span class="stringliteral">&quot;unexpected NULL parameters&quot;</span>);</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; fmpz_poly_zero(poly);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">while</span> (num_ones != 0 || num_neg_ones != 0) {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; int32_t pos = rnd_int() % params-&gt;<a class="code" href="structntru__params.html#afb8425ee3db2b917b3c4e8d9b75bd3ff">N</a>;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="keywordflow">if</span> (!<a class="code" href="ntru__poly_8c.html#aaaac83ec72414aa208832442657c3520">fmpz_cmp_si_n</a>(fmpz_poly_get_coeff_ptr(poly, pos), 0)) {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">if</span> (num_ones &gt; 0) {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; fmpz_poly_set_coeff_si(poly, pos, 1);</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; num_ones--;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (num_neg_ones &gt; 0) {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; fmpz_poly_set_coeff_si(poly, pos, -1);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; num_neg_ones--;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; }</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; }</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;}</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="ttc" id="structntru__params_html_afb8425ee3db2b917b3c4e8d9b75bd3ff"><div class="ttname"><a href="structntru__params.html#afb8425ee3db2b917b3c4e8d9b75bd3ff">ntru_params::N</a></div><div class="ttdeci">uint32_t N</div><div class="ttdef"><b>Definition:</b> <a href="ntru__params_8h_source.html#l00048">ntru_params.h:48</a></div></div>
<div class="ttc" id="ntru__rnd_8c_html_a99e4820cab7157eb1e16109e21dac81f"><div class="ttname"><a href="ntru__rnd_8c.html#a99e4820cab7157eb1e16109e21dac81f">get_urnd_int</a></div><div class="ttdeci">int get_urnd_int(void)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__rnd_8c_source.html#l00066">ntru_rnd.c:66</a></div></div>
<div class="ttc" id="ntru__err_8h_html_a5d4dd1c1539c408c0dcd915750e8f224"><div class="ttname"><a href="ntru__err_8h.html#a5d4dd1c1539c408c0dcd915750e8f224">NTRU_ABORT_DEBUG</a></div><div class="ttdeci">#define NTRU_ABORT_DEBUG(...)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__err_8h_source.html#l00039">ntru_err.h:39</a></div></div>
<div class="ttc" id="ntru__rnd_8c_html_ad85ebfb1cb4b4942942213b750812cf0"><div class="ttname"><a href="ntru__rnd_8c.html#ad85ebfb1cb4b4942942213b750812cf0">get_rnd_int</a></div><div class="ttdeci">int get_rnd_int(void)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__rnd_8c_source.html#l00042">ntru_rnd.c:42</a></div></div>
<div class="ttc" id="structntru__params_html"><div class="ttname"><a href="structntru__params.html">ntru_params</a></div><div class="ttdef"><b>Definition:</b> <a href="ntru__params_8h_source.html#l00043">ntru_params.h:43</a></div></div>
<div class="ttc" id="ntru__params_8h_html"><div class="ttname"><a href="ntru__params_8h.html">ntru_params.h</a></div><div class="ttdoc">NTRU parameters. </div></div>
<div class="ttc" id="ntru__rnd_8c_html_a916a55c609c172ae4e48896032b36e47"><div class="ttname"><a href="ntru__rnd_8c.html#a916a55c609c172ae4e48896032b36e47">ntru_get_rnd_tern_poly_num</a></div><div class="ttdeci">void ntru_get_rnd_tern_poly_num(fmpz_poly_t poly, const ntru_params *params, uint32_t num_ones, uint32_t num_neg_ones, int(*rnd_int)(void))</div><div class="ttdef"><b>Definition:</b> <a href="ntru__rnd_8c_source.html#l00086">ntru_rnd.c:86</a></div></div>
<div class="ttc" id="ntru__err_8h_html"><div class="ttname"><a href="ntru__err_8h.html">ntru_err.h</a></div><div class="ttdoc">error handling </div></div>
<div class="ttc" id="ntru__poly_8c_html_aaaac83ec72414aa208832442657c3520"><div class="ttname"><a href="ntru__poly_8c.html#aaaac83ec72414aa208832442657c3520">fmpz_cmp_si_n</a></div><div class="ttdeci">int fmpz_cmp_si_n(const fmpz_t f, slong g)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__poly_8c_source.html#l00093">ntru_poly.c:93</a></div></div>
<div class="ttc" id="ntru__poly_8h_html"><div class="ttname"><a href="ntru__poly_8h.html">ntru_poly.h</a></div><div class="ttdoc">header for ntru_poly.c </div></div>
<div class="ttc" id="ntru__err_8h_html_ab0f71521e9bc99beab8ece52bb00341a"><div class="ttname"><a href="ntru__err_8h.html#ab0f71521e9bc99beab8ece52bb00341a">NTRU_ABORT</a></div><div class="ttdeci">#define NTRU_ABORT(...)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__err_8h_source.html#l00033">ntru_err.h:33</a></div></div>
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