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<title>post quantum cryptography: /home/travis/build/hasufell/pqc/src/ntru_encrypt.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_encrypt.c</div> </div>
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<a href="ntru__encrypt_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="l00029"></a>00029 <span class="preprocessor">#include "<a class="code" href="ntru__ascii__poly_8h.html" title="header for ntru_ascii_poly.c">ntru_ascii_poly.h</a>"</span>
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<a name="l00030"></a>00030 <span class="preprocessor">#include "<a class="code" href="ntru__encrypt_8h.html" title="header for encrypt.c">ntru_encrypt.h</a>"</span>
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<a name="l00031"></a>00031 <span class="preprocessor">#include "<a class="code" href="ntru__mem_8h.html" title="header for ntru_mem.c">ntru_mem.h</a>"</span>
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<a name="l00032"></a>00032 <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="l00033"></a>00033 <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="l00034"></a>00034 <span class="preprocessor">#include "<a class="code" href="ntru__poly__ascii_8h.html" title="header for ntru_poly_ascii.c">ntru_poly_ascii.h</a>"</span>
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<a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="ntru__string_8h.html" title="header for ntru_string.c">ntru_string.h</a>"</span>
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<a name="l00036"></a>00036
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<a name="l00037"></a>00037 <span class="preprocessor">#include <string.h></span>
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<a name="l00038"></a>00038
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<a name="l00039"></a>00039 <span class="preprocessor">#include <fmpz_poly.h></span>
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<a name="l00040"></a>00040 <span class="preprocessor">#include <fmpz.h></span>
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<a name="l00041"></a>00041
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<a name="l00042"></a>00042
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<a name="l00043"></a>00043 <span class="comment">/*------------------------------------------------------------------------*/</span>
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<a name="l00044"></a>00044
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<a name="l00045"></a>00045 <span class="keywordtype">void</span>
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<a name="l00046"></a><a class="code" href="ntru__encrypt_8h.html#a9063450af4b523d202c7628dbac70e68">00046</a> <a class="code" href="ntru__encrypt_8c.html#a0156453c7cab7cf3da259beb1daf914b">ntru_encrypt_poly</a>(
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<a name="l00047"></a>00047 <span class="keyword">const</span> fmpz_poly_t msg_bin,
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<a name="l00048"></a>00048 <span class="keyword">const</span> fmpz_poly_t pub_key,
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<a name="l00049"></a>00049 <span class="keyword">const</span> fmpz_poly_t rnd,
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<a name="l00050"></a>00050 fmpz_poly_t out,
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<a name="l00051"></a>00051 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)
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<a name="l00052"></a>00052 {
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<a name="l00053"></a>00053 fmpz_poly_t tmp_poly_msg;
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<a name="l00054"></a>00054
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<a name="l00055"></a>00055 <span class="keywordflow">if</span> (!msg_bin || !pub_key || !rnd || !out || !params)
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<a name="l00056"></a>00056 <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="l00057"></a>00057
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<a name="l00058"></a>00058 <span class="comment">/* allow aliasing */</span>
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<a name="l00059"></a>00059 fmpz_poly_init(tmp_poly_msg);
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<a name="l00060"></a>00060 fmpz_poly_set(tmp_poly_msg, msg_bin);
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<a name="l00061"></a>00061
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<a name="l00062"></a>00062 fmpz_poly_zero(out);
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<a name="l00063"></a>00063 <a class="code" href="ntru__poly_8c.html#ae96f479ddd97af709a0ed50817fd3fb3">poly_starmultiply</a>(pub_key, rnd, out, params, params-><a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
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<a name="l00064"></a>00064
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<a name="l00065"></a>00065 fmpz_poly_add(out, out, tmp_poly_msg);
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<a name="l00066"></a>00066 <a class="code" href="ntru__poly_8c.html#ae7d0d8364dba689df3fb4904610634cc">fmpz_poly_mod_unsigned</a>(out, params-><a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
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<a name="l00067"></a>00067
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<a name="l00068"></a>00068 fmpz_poly_clear(tmp_poly_msg);
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<a name="l00069"></a>00069 }
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<a name="l00070"></a>00070
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<a name="l00071"></a>00071 <span class="comment">/*------------------------------------------------------------------------*/</span>
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<a name="l00072"></a>00072
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<a name="l00073"></a>00073 <span class="keywordtype">string</span> *
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<a name="l00074"></a><a class="code" href="encrypt_8h.html#a0bb47c0fa0dd4a4cfa0c0f7a722fd554">00074</a> <a class="code" href="ntru__encrypt_8c.html#a0bb47c0fa0dd4a4cfa0c0f7a722fd554">ntru_encrypt_string</a>(
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<a name="l00075"></a>00075 <span class="keyword">const</span> <span class="keywordtype">string</span> *msg,
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<a name="l00076"></a>00076 <span class="keyword">const</span> fmpz_poly_t pub_key,
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<a name="l00077"></a>00077 <span class="keyword">const</span> fmpz_poly_t rnd,
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<a name="l00078"></a>00078 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)
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<a name="l00079"></a>00079 {
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<a name="l00080"></a>00080 uint32_t i = 0;
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<a name="l00081"></a>00081 <span class="keywordtype">string</span> *enc_msg;
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<a name="l00082"></a>00082 fmpz_poly_t **poly_array;
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<a name="l00083"></a>00083
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<a name="l00084"></a>00084 <span class="keywordflow">if</span> (!msg || !msg-><a class="code" href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">len</a>)
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<a name="l00085"></a>00085 <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="l00086"></a>00086
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<a name="l00087"></a>00087 poly_array = <a class="code" href="ntru__ascii__poly_8c.html#a3237071bca2489c3b2efd46e674e0805">ascii_to_bin_poly_arr</a>(msg, params);
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<a name="l00088"></a>00088
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<a name="l00089"></a>00089 <span class="keywordflow">while</span> (*poly_array[i]) {
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<a name="l00090"></a>00090 <a class="code" href="ntru__encrypt_8c.html#a0156453c7cab7cf3da259beb1daf914b">ntru_encrypt_poly</a>(*poly_array[i],
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<a name="l00091"></a>00091 pub_key,
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<a name="l00092"></a>00092 rnd,
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<a name="l00093"></a>00093 *poly_array[i],
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<a name="l00094"></a>00094 params);
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<a name="l00095"></a>00095 i++;
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<a name="l00096"></a>00096 }
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<a name="l00097"></a>00097
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<a name="l00098"></a>00098 enc_msg = <a class="code" href="ntru__poly__ascii_8c.html#a0dc14698073df2e46e6540cbff870fc7">poly_arr_to_base64</a>((<span class="keyword">const</span> fmpz_poly_t **)poly_array,
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<a name="l00099"></a>00099 i, params);
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<a name="l00100"></a>00100
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<a name="l00101"></a>00101 <a class="code" href="ntru__poly_8c.html#a3f53c63383ff301b20dcede0783869a7">poly_delete_array</a>(poly_array);
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<a name="l00102"></a>00102
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<a name="l00103"></a>00103 <span class="keywordflow">return</span> enc_msg;
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<a name="l00104"></a>00104 }
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<a name="l00105"></a>00105
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<a name="l00106"></a>00106 <span class="comment">/*------------------------------------------------------------------------*/</span>
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</pre></div></div><!-- contents -->
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