<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <title>post quantum cryptography: /home/travis/build/hasufell/pqc/src/ntru_rnd.c Source File</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css" /> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> </head> <body> <div id="top"><!-- do not remove this div! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">post quantum cryptography </div> <div id="projectbrief">Highly optimized implementation of the NTRUEncrypt algorithm</div> </td> </tr> </tbody> </table> </div> <!-- Generated by Doxygen 1.7.6.1 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> <input type="text" id="MSearchField" value="Search" accesskey="S" onfocus="searchBox.OnSearchFieldFocus(true)" onblur="searchBox.OnSearchFieldFocus(false)" onkeyup="searchBox.OnSearchFieldChange(event)"/> </span><span class="right"> <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a> </span> </div> </li> </ul> </div> <div id="navrow2" class="tabs2"> <ul class="tablist"> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul> </div> </div> <div class="header"> <div class="headertitle"> <div class="title">/home/travis/build/hasufell/pqc/src/ntru_rnd.c</div> </div> </div><!--header--> <div class="contents"> <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> <a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2014 FH Bielefeld</span> <a name="l00003"></a>00003 <span class="comment"> *</span> <a name="l00004"></a>00004 <span class="comment"> * This file is part of a FH Bielefeld project.</span> <a name="l00005"></a>00005 <span class="comment"> *</span> <a name="l00006"></a>00006 <span class="comment"> * This library is free software; you can redistribute it and/or</span> <a name="l00007"></a>00007 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span> <a name="l00008"></a>00008 <span class="comment"> * License as published by the Free Software Foundation; either</span> <a name="l00009"></a>00009 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span> <a name="l00010"></a>00010 <span class="comment"> *</span> <a name="l00011"></a>00011 <span class="comment"> * This library is distributed in the hope that it will be useful,</span> <a name="l00012"></a>00012 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span> <a name="l00013"></a>00013 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span> <a name="l00014"></a>00014 <span class="comment"> * Lesser General Public License for more details.</span> <a name="l00015"></a>00015 <span class="comment"> *</span> <a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span> <a name="l00017"></a>00017 <span class="comment"> * License along with this library; if not, write to the Free Software</span> <a name="l00018"></a>00018 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,</span> <a name="l00019"></a>00019 <span class="comment"> * MA 02110-1301 USA</span> <a name="l00020"></a>00020 <span class="comment"> */</span> <a name="l00021"></a>00021 <a name="l00028"></a>00028 <span class="preprocessor">#include "math.h"</span> <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> <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> <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> <a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="preprocessor">#include <fmpz_poly.h></span> <a name="l00034"></a>00034 <span class="preprocessor">#include <fcntl.h></span> <a name="l00035"></a>00035 <span class="preprocessor">#include <stdlib.h></span> <a name="l00036"></a>00036 <span class="preprocessor">#include <unistd.h></span> <a name="l00037"></a>00037 <a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="comment">/*------------------------------------------------------------------------*/</span> <a name="l00040"></a>00040 <a name="l00041"></a>00041 <span class="keywordtype">int</span> <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>) <a name="l00043"></a>00043 { <a name="l00044"></a>00044 <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">"/dev/random"</span>, O_RDONLY); <a name="l00045"></a>00045 <span class="keywordtype">int</span> rnd_int; <a name="l00046"></a>00046 <span class="keywordtype">size_t</span> rnd_len = 0; <a name="l00047"></a>00047 <a name="l00048"></a>00048 <span class="keywordflow">while</span> (rnd_len < <span class="keyword">sizeof</span>(rnd_int)) { <a name="l00049"></a>00049 ssize_t result = read(rnd_data, ((<span class="keywordtype">char</span>*)&rnd_int) + rnd_len, <a name="l00050"></a>00050 <span class="keyword">sizeof</span>(rnd_int) - rnd_len); <a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="keywordflow">if</span> (result < 0) <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>); <a name="l00054"></a>00054 <a name="l00055"></a>00055 rnd_len += result; <a name="l00056"></a>00056 } <a name="l00057"></a>00057 <a name="l00058"></a>00058 close(rnd_data); <a name="l00059"></a>00059 <a name="l00060"></a>00060 <span class="keywordflow">return</span> rnd_int; <a name="l00061"></a>00061 } <a name="l00062"></a>00062 <a name="l00063"></a>00063 <span class="comment">/*------------------------------------------------------------------------*/</span> <a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="keywordtype">int</span> <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>) <a name="l00067"></a>00067 { <a name="l00068"></a>00068 <span class="keywordtype">int</span> rnd_data = open(<span class="stringliteral">"/dev/urandom"</span>, O_RDONLY); <a name="l00069"></a>00069 <span class="keywordtype">int</span> rnd_int; <a name="l00070"></a>00070 ssize_t result; <a name="l00071"></a>00071 <a name="l00072"></a>00072 result = read(rnd_data, ((<span class="keywordtype">char</span>*)&rnd_int), <a name="l00073"></a>00073 <span class="keyword">sizeof</span>(rnd_int)); <a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keywordflow">if</span> (result < 0) <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>); <a name="l00077"></a>00077 <a name="l00078"></a>00078 close(rnd_data); <a name="l00079"></a>00079 <a name="l00080"></a>00080 <span class="keywordflow">return</span> rnd_int; <a name="l00081"></a>00081 } <a name="l00082"></a>00082 <a name="l00083"></a>00083 <span class="comment">/*------------------------------------------------------------------------*/</span> <a name="l00084"></a>00084 <a name="l00085"></a>00085 <span class="keywordtype">void</span> <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, <a name="l00087"></a>00087 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params, <a name="l00088"></a>00088 uint32_t num_ones, <a name="l00089"></a>00089 uint32_t num_neg_ones, <a name="l00090"></a>00090 <span class="keywordtype">int</span> (*rnd_int)(<span class="keywordtype">void</span>)) <a name="l00091"></a>00091 { <a name="l00092"></a>00092 <span class="keywordflow">if</span> (!poly || ! params) <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>); <a name="l00094"></a>00094 <a name="l00095"></a>00095 fmpz_poly_zero(poly); <a name="l00096"></a>00096 <a name="l00097"></a>00097 <span class="keywordflow">while</span> (num_ones != 0 || num_neg_ones != 0) { <a name="l00098"></a>00098 int32_t pos = rnd_int() % params-><a class="code" href="structntru__params.html#afb8425ee3db2b917b3c4e8d9b75bd3ff">N</a>; <a name="l00099"></a>00099 <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)) { <a name="l00101"></a>00101 <span class="keywordflow">if</span> (num_ones > 0) { <a name="l00102"></a>00102 fmpz_poly_set_coeff_si(poly, pos, 1); <a name="l00103"></a>00103 num_ones--; <a name="l00104"></a>00104 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (num_neg_ones > 0) { <a name="l00105"></a>00105 fmpz_poly_set_coeff_si(poly, pos, -1); <a name="l00106"></a>00106 num_neg_ones--; <a name="l00107"></a>00107 } <a name="l00108"></a>00108 } <a name="l00109"></a>00109 } <a name="l00110"></a>00110 } <a name="l00111"></a>00111 <a name="l00112"></a>00112 <span class="comment">/*------------------------------------------------------------------------*/</span> </pre></div></div><!-- contents --> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Defines</a></div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <hr class="footer"/><address class="footer"><small> Generated on Sun Jun 8 2014 21:44:12 for post quantum cryptography by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/> </a> 1.7.6.1 </small></address> </body> </html>