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<div id="projectbrief">Highly optimized implementation of the NTRUEncrypt algorithm</div>
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<a href="ntru__decrypt_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="l00029"></a>00029 <span class="preprocessor">#include &quot;<a class="code" href="ntru__ascii__poly_8h.html" title="header for ntru_ascii_poly.c">ntru_ascii_poly.h</a>&quot;</span>
<a name="l00030"></a>00030 <span class="preprocessor">#include &quot;<a class="code" href="ntru__decrypt_8h.html" title="header for ntru_decrypt.c">ntru_decrypt.h</a>&quot;</span>
<a name="l00031"></a>00031 <span class="preprocessor">#include &quot;<a class="code" href="ntru__params_8h.html" title="NTRU parameters.">ntru_params.h</a>&quot;</span>
<a name="l00032"></a>00032 <span class="preprocessor">#include &quot;<a class="code" href="ntru__poly_8h.html" title="header for ntru_poly.c">ntru_poly.h</a>&quot;</span>
<a name="l00033"></a>00033 <span class="preprocessor">#include &quot;<a class="code" href="ntru__poly__ascii_8h.html" title="header for ntru_poly_ascii.c">ntru_poly_ascii.h</a>&quot;</span>
<a name="l00034"></a>00034 <span class="preprocessor">#include &quot;<a class="code" href="ntru__string_8h.html" title="header for ntru_string.c">ntru_string.h</a>&quot;</span>
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00037"></a>00037 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#include &lt;fmpz_poly.h&gt;</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;fmpz.h&gt;</span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="keywordtype">void</span>
<a name="l00046"></a><a class="code" href="ntru__decrypt_8h.html#a8108219b815b18d63672bbc45e76ca31">00046</a> <a class="code" href="ntru__decrypt_8c.html#a41c72f59e37a3c6ef6790eb909555d76">ntru_decrypt_poly</a>(
<a name="l00047"></a>00047 <span class="keyword">const</span> fmpz_poly_t encr_msg,
<a name="l00048"></a>00048 <span class="keyword">const</span> fmpz_poly_t priv_key,
<a name="l00049"></a>00049 <span class="keyword">const</span> fmpz_poly_t priv_key_inv,
<a name="l00050"></a>00050 fmpz_poly_t out_bin,
<a name="l00051"></a>00051 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 fmpz_poly_t a,
<a name="l00054"></a>00054 priv_key_tmp,
<a name="l00055"></a>00055 priv_key_inv_tmp,
<a name="l00056"></a>00056 encr_msg_tmp;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (!encr_msg || !priv_key || !priv_key_inv || !out_bin || !params)
<a name="l00059"></a>00059 <a class="code" href="ntru__err_8h.html#a5d4dd1c1539c408c0dcd915750e8f224">NTRU_ABORT_DEBUG</a>(<span class="stringliteral">&quot;Unexpected NULL parameters&quot;</span>);
<a name="l00060"></a>00060
<a name="l00061"></a>00061 fmpz_poly_init(a);
<a name="l00062"></a>00062 fmpz_poly_zero(a);
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="comment">/*</span>
<a name="l00065"></a>00065 <span class="comment"> * make sure all are shifted to</span>
<a name="l00066"></a>00066 <span class="comment"> * [-q/2, q/2]</span>
<a name="l00067"></a>00067 <span class="comment"> */</span>
<a name="l00068"></a>00068 fmpz_poly_init(priv_key_tmp);
<a name="l00069"></a>00069 fmpz_poly_init(priv_key_inv_tmp);
<a name="l00070"></a>00070 fmpz_poly_init(encr_msg_tmp);
<a name="l00071"></a>00071 fmpz_poly_set(priv_key_tmp, priv_key);
<a name="l00072"></a>00072 fmpz_poly_set(priv_key_inv_tmp, priv_key_inv);
<a name="l00073"></a>00073 fmpz_poly_set(encr_msg_tmp, encr_msg);
<a name="l00074"></a>00074 <a class="code" href="ntru__poly_8c.html#a7c4f5e96355518dc97a23da8f34b661a">fmpz_poly_mod</a>(priv_key_tmp, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
<a name="l00075"></a>00075 <a class="code" href="ntru__poly_8c.html#a7c4f5e96355518dc97a23da8f34b661a">fmpz_poly_mod</a>(priv_key_inv_tmp, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
<a name="l00076"></a>00076 <a class="code" href="ntru__poly_8c.html#a7c4f5e96355518dc97a23da8f34b661a">fmpz_poly_mod</a>(encr_msg_tmp, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <a class="code" href="ntru__poly_8c.html#ae96f479ddd97af709a0ed50817fd3fb3">poly_starmultiply</a>(priv_key_tmp, encr_msg_tmp, a, params, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
<a name="l00079"></a>00079 <a class="code" href="ntru__poly_8c.html#a7c4f5e96355518dc97a23da8f34b661a">fmpz_poly_mod</a>(a, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);
<a name="l00080"></a>00080 <a class="code" href="ntru__poly_8c.html#ae96f479ddd97af709a0ed50817fd3fb3">poly_starmultiply</a>(a, priv_key_inv_tmp, out_bin, params, params-&gt;<a class="code" href="structntru__params.html#a41b368825e1eb126604e13e8f549ec8f">p</a>);
<a name="l00081"></a>00081 <a class="code" href="ntru__poly_8c.html#a7c4f5e96355518dc97a23da8f34b661a">fmpz_poly_mod</a>(out_bin, params-&gt;<a class="code" href="structntru__params.html#a41b368825e1eb126604e13e8f549ec8f">p</a>);
<a name="l00082"></a>00082
<a name="l00083"></a>00083 fmpz_poly_clear(a);
<a name="l00084"></a>00084 fmpz_poly_clear(priv_key_tmp);
<a name="l00085"></a>00085 fmpz_poly_clear(priv_key_inv_tmp);
<a name="l00086"></a>00086 fmpz_poly_clear(encr_msg_tmp);
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088
<a name="l00089"></a>00089 <span class="comment">/*------------------------------------------------------------------------*/</span>
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordtype">string</span> *
<a name="l00092"></a><a class="code" href="decrypt_8h.html#aa9cc61eec0c119e48762f6078a14527b">00092</a> <a class="code" href="ntru__decrypt_8c.html#aa9cc61eec0c119e48762f6078a14527b">ntru_decrypt_string</a>(
<a name="l00093"></a>00093 <span class="keyword">const</span> <span class="keywordtype">string</span> *encr_msg,
<a name="l00094"></a>00094 <span class="keyword">const</span> fmpz_poly_t priv_key,
<a name="l00095"></a>00095 <span class="keyword">const</span> fmpz_poly_t priv_key_inv,
<a name="l00096"></a>00096 <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098 uint32_t i = 0;
<a name="l00099"></a>00099 <span class="keywordtype">string</span> *decr_msg;
<a name="l00100"></a>00100 fmpz_poly_t **poly_array;
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (!encr_msg || !encr_msg-&gt;<a class="code" href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">len</a>)
<a name="l00103"></a>00103 <a class="code" href="ntru__err_8h.html#a5d4dd1c1539c408c0dcd915750e8f224">NTRU_ABORT_DEBUG</a>(<span class="stringliteral">&quot;Unexpected NULL parameters&quot;</span>);
<a name="l00104"></a>00104
<a name="l00105"></a>00105 poly_array = <a class="code" href="ntru__ascii__poly_8c.html#a8460cd27ad4562f560bb304609a3e06d">base64_to_poly_arr</a>(encr_msg, params);
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <span class="keywordflow">while</span> (*poly_array[i]) {
<a name="l00108"></a>00108 <a class="code" href="ntru__decrypt_8c.html#a41c72f59e37a3c6ef6790eb909555d76">ntru_decrypt_poly</a>(*poly_array[i],
<a name="l00109"></a>00109 priv_key,
<a name="l00110"></a>00110 priv_key_inv,
<a name="l00111"></a>00111 *poly_array[i],
<a name="l00112"></a>00112 params);
<a name="l00113"></a>00113 i++;
<a name="l00114"></a>00114 }
<a name="l00115"></a>00115
<a name="l00116"></a>00116 decr_msg = <a class="code" href="ntru__poly__ascii_8c.html#ab9464c96c3ebec6ee716c604fdc4ad21">bin_poly_arr_to_ascii</a>((<span class="keyword">const</span> fmpz_poly_t **)poly_array,
<a name="l00117"></a>00117 i, params);
<a name="l00118"></a>00118
<a name="l00119"></a>00119 <a class="code" href="ntru__poly_8c.html#a3f53c63383ff301b20dcede0783869a7">poly_delete_array</a>(poly_array);
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keywordflow">return</span> decr_msg;
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="comment">/*------------------------------------------------------------------------*/</span>
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