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<title>post quantum cryptography: /home/travis/build/hasufell/pqc/src/ntru_rnd.c Source File</title>
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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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<div class="title">/home/travis/build/hasufell/pqc/src/ntru_rnd.c</div> </div>
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<a href="ntru__rnd_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
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<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2014 FH Bielefeld</span>
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<a name="l00003"></a>00003 <span class="comment"> *</span>
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<a name="l00004"></a>00004 <span class="comment"> * This file is part of a FH Bielefeld project.</span>
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<a name="l00005"></a>00005 <span class="comment"> *</span>
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<a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
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<a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
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<a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either</span>
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<a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
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<a name="l00010"></a>00010 <span class="comment"> *</span>
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<a name="l00011"></a>00011 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
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<a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
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<a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
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<a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details.</span>
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<a name="l00015"></a>00015 <span class="comment"> *</span>
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<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
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<a name="l00017"></a>00017 <span class="comment"> * License along with this library; if not, write to the Free Software</span>
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<a name="l00018"></a>00018 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,</span>
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<a name="l00019"></a>00019 <span class="comment"> * MA 02110-1301 USA</span>
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<a name="l00020"></a>00020 <span class="comment"> */</span>
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<a name="l00021"></a>00021
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<a name="l00028"></a>00028 <span class="preprocessor">#include "math.h"</span>
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<a name="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="ntru__err_8h.html" title="error handling">ntru_err.h</a>"</span>
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<a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="ntru__params_8h.html" title="NTRU parameters.">ntru_params.h</a>"</span>
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<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="ntru__poly_8h.html" title="header for ntru_poly.c">ntru_poly.h</a>"</span>
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<a name="l00032"></a>00032
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<a name="l00033"></a>00033 <span class="preprocessor">#include <fmpz_poly.h></span>
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<a name="l00034"></a>00034 <span class="preprocessor">#include <fcntl.h></span>
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<a name="l00035"></a>00035 <span class="preprocessor">#include <stdlib.h></span>
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<a name="l00036"></a>00036 <span class="preprocessor">#include <unistd.h></span>
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<a name="l00037"></a>00037
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<a name="l00038"></a>00038
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<a name="l00039"></a>00039 <span class="comment">/*------------------------------------------------------------------------*/</span>
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<a name="l00040"></a>00040
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<a name="l00041"></a>00041 <span class="keywordtype">int</span>
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<a name="l00042"></a><a class="code" href="rnd_8h.html#ad85ebfb1cb4b4942942213b750812cf0">00042</a> <a class="code" href="ntru__rnd_8c.html#ad85ebfb1cb4b4942942213b750812cf0">get_rnd_int</a>(<span class="keywordtype">void</span>)
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<a name="l00043"></a>00043 {
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<a name="l00044"></a>00044 <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">"/dev/random"</span>, O_RDONLY);
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<a name="l00045"></a>00045 <span class="keywordtype">int</span> rnd_int;
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<a name="l00046"></a>00046 <span class="keywordtype">size_t</span> rnd_len = 0;
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<a name="l00047"></a>00047
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<a name="l00048"></a>00048 <span class="keywordflow">while</span> (rnd_len < <span class="keyword">sizeof</span>(rnd_int)) {
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<a name="l00049"></a>00049 ssize_t result = read(rnd_data, ((<span class="keywordtype">char</span>*)&rnd_int) + rnd_len,
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<a name="l00050"></a>00050 <span class="keyword">sizeof</span>(rnd_int) - rnd_len);
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<a name="l00051"></a>00051
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<a name="l00052"></a>00052 <span class="keywordflow">if</span> (result < 0)
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<a name="l00053"></a>00053 <a class="code" href="ntru__err_8h.html#ab0f71521e9bc99beab8ece52bb00341a">NTRU_ABORT</a>(<span class="stringliteral">"Unable to read /dev/random!\n"</span>);
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<a name="l00054"></a>00054
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<a name="l00055"></a>00055 rnd_len += result;
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<a name="l00056"></a>00056 }
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<a name="l00057"></a>00057
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<a name="l00058"></a>00058 close(rnd_data);
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<a name="l00059"></a>00059
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<a name="l00060"></a>00060 <span class="keywordflow">return</span> rnd_int;
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<a name="l00061"></a>00061 }
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<a name="l00062"></a>00062
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<a name="l00063"></a>00063 <span class="comment">/*------------------------------------------------------------------------*/</span>
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<a name="l00064"></a>00064
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<a name="l00065"></a>00065 <span class="keywordtype">int</span>
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<a name="l00066"></a><a class="code" href="rnd_8h.html#a99e4820cab7157eb1e16109e21dac81f">00066</a> <a class="code" href="ntru__rnd_8c.html#a99e4820cab7157eb1e16109e21dac81f">get_urnd_int</a>(<span class="keywordtype">void</span>)
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<a name="l00067"></a>00067 {
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<a name="l00068"></a>00068 <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">"/dev/urandom"</span>, O_RDONLY);
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<a name="l00069"></a>00069 <span class="keywordtype">int</span> rnd_int;
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<a name="l00070"></a>00070 ssize_t result;
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<a name="l00071"></a>00071
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<a name="l00072"></a>00072 result = read(rnd_data, ((<span class="keywordtype">char</span>*)&rnd_int),
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<a name="l00073"></a>00073 <span class="keyword">sizeof</span>(rnd_int));
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<a name="l00074"></a>00074
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<a name="l00075"></a>00075 <span class="keywordflow">if</span> (result < 0)
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<a name="l00076"></a>00076 <a class="code" href="ntru__err_8h.html#ab0f71521e9bc99beab8ece52bb00341a">NTRU_ABORT</a>(<span class="stringliteral">"Unable to read /dev/urandom!\n"</span>);
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<a name="l00077"></a>00077
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<a name="l00078"></a>00078 close(rnd_data);
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<a name="l00079"></a>00079
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<a name="l00080"></a>00080 <span class="keywordflow">return</span> rnd_int;
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<a name="l00081"></a>00081 }
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<a name="l00082"></a>00082
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<a name="l00083"></a>00083 <span class="comment">/*------------------------------------------------------------------------*/</span>
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<a name="l00084"></a>00084
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<a name="l00085"></a>00085 <span class="keywordtype">void</span>
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<a name="l00086"></a><a class="code" href="rnd_8h.html#a916a55c609c172ae4e48896032b36e47">00086</a> <a class="code" href="ntru__rnd_8c.html#a916a55c609c172ae4e48896032b36e47">ntru_get_rnd_tern_poly_num</a>(fmpz_poly_t poly,
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<a name="l00087"></a>00087 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params,
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<a name="l00088"></a>00088 uint32_t num_ones,
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<a name="l00089"></a>00089 uint32_t num_neg_ones,
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<a name="l00090"></a>00090 <span class="keywordtype">int</span> (*rnd_int)(<span class="keywordtype">void</span>))
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<a name="l00091"></a>00091 {
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<a name="l00092"></a>00092 <span class="keywordflow">if</span> (!poly || ! params)
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<a name="l00093"></a>00093 <a class="code" href="ntru__err_8h.html#a5d4dd1c1539c408c0dcd915750e8f224">NTRU_ABORT_DEBUG</a>(<span class="stringliteral">"unexpected NULL parameters"</span>);
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<a name="l00094"></a>00094
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<a name="l00095"></a>00095 fmpz_poly_zero(poly);
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<a name="l00096"></a>00096
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<a name="l00097"></a>00097 <span class="keywordflow">while</span> (num_ones != 0 || num_neg_ones != 0) {
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<a name="l00098"></a>00098 int32_t pos = rnd_int() % params-><a class="code" href="structntru__params.html#afb8425ee3db2b917b3c4e8d9b75bd3ff">N</a>;
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<a name="l00099"></a>00099
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<a name="l00100"></a>00100 <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)) {
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<a name="l00101"></a>00101 <span class="keywordflow">if</span> (num_ones > 0) {
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<a name="l00102"></a>00102 fmpz_poly_set_coeff_si(poly, pos, 1);
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<a name="l00103"></a>00103 num_ones--;
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<a name="l00104"></a>00104 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (num_neg_ones > 0) {
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<a name="l00105"></a>00105 fmpz_poly_set_coeff_si(poly, pos, -1);
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<a name="l00106"></a>00106 num_neg_ones--;
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<a name="l00107"></a>00107 }
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<a name="l00108"></a>00108 }
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<a name="l00109"></a>00109 }
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<a name="l00110"></a>00110 }
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<a name="l00111"></a>00111
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<a name="l00112"></a>00112 <span class="comment">/*------------------------------------------------------------------------*/</span>
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</pre></div></div><!-- contents -->
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