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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__encrypt_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="l00029"></a><span class="lineno"> 29</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__ascii__poly_8h.html">ntru_ascii_poly.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__encrypt_8h.html">ntru_encrypt.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__mem_8h.html">ntru_mem.h</a>&quot;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</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="l00033"></a><span class="lineno"> 33</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="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__poly__ascii_8h.html">ntru_poly_ascii.h</a>&quot;</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ntru__string_8h.html">ntru_string.h</a>&quot;</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></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="preprocessor">#include &lt;fmpz_poly.h&gt;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="preprocessor">#include &lt;fmpz.h&gt;</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="keywordtype">void</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="ntru__encrypt_8h.html#a9063450af4b523d202c7628dbac70e68"> 46</a></span>&#160;<a class="code" href="ntru__encrypt_8c.html#a0156453c7cab7cf3da259beb1daf914b">ntru_encrypt_poly</a>(</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="keyword">const</span> fmpz_poly_t msg_bin,</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keyword">const</span> fmpz_poly_t pub_key,</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keyword">const</span> fmpz_poly_t rnd,</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; fmpz_poly_t out,</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;{</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; fmpz_poly_t tmp_poly_msg;</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; <span class="keywordflow">if</span> (!msg_bin || !pub_key || !rnd || !out || !params)</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</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="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="comment">/* allow aliasing */</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; fmpz_poly_init(tmp_poly_msg);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; fmpz_poly_set(tmp_poly_msg, msg_bin);</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; fmpz_poly_zero(out);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <a class="code" href="ntru__poly_8c.html#ae96f479ddd97af709a0ed50817fd3fb3">poly_starmultiply</a>(pub_key, rnd, out, params, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);</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; fmpz_poly_add(out, out, tmp_poly_msg);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <a class="code" href="ntru__poly_8c.html#ae7d0d8364dba689df3fb4904610634cc">fmpz_poly_mod_unsigned</a>(out, params-&gt;<a class="code" href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">q</a>);</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; fmpz_poly_clear(tmp_poly_msg);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;}</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;<span class="keywordtype">string</span> *</div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="encrypt_8h.html#a0bb47c0fa0dd4a4cfa0c0f7a722fd554"> 74</a></span>&#160;<a class="code" href="ntru__encrypt_8c.html#a0bb47c0fa0dd4a4cfa0c0f7a722fd554">ntru_encrypt_string</a>(</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keyword">const</span> <span class="keywordtype">string</span> *msg,</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="keyword">const</span> fmpz_poly_t pub_key,</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keyword">const</span> fmpz_poly_t rnd,</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keyword">const</span> <a class="code" href="structntru__params.html">ntru_params</a> *params)</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; uint32_t i = 0;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordtype">string</span> *enc_msg;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; fmpz_poly_t **poly_array;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordflow">if</span> (!msg || !msg-&gt;<a class="code" href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">len</a>)</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</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="l00086"></a><span class="lineno"> 86</span>&#160;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; poly_array = <a class="code" href="ntru__ascii__poly_8c.html#a3237071bca2489c3b2efd46e674e0805">ascii_to_bin_poly_arr</a>(msg, params);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">while</span> (*poly_array[i]) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <a class="code" href="ntru__encrypt_8c.html#a0156453c7cab7cf3da259beb1daf914b">ntru_encrypt_poly</a>(*poly_array[i],</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; pub_key,</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; rnd,</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; *poly_array[i],</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; params);</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; i++;</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;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; 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,</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; i, params);</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <a class="code" href="ntru__poly_8c.html#a3f53c63383ff301b20dcede0783869a7">poly_delete_array</a>(poly_array);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">return</span> enc_msg;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;}</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="ttc" id="ntru__ascii__poly_8c_html_a3237071bca2489c3b2efd46e674e0805"><div class="ttname"><a href="ntru__ascii__poly_8c.html#a3237071bca2489c3b2efd46e674e0805">ascii_to_bin_poly_arr</a></div><div class="ttdeci">fmpz_poly_t ** ascii_to_bin_poly_arr(const string *to_poly, const ntru_params *params)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__ascii__poly_8c_source.html#l00101">ntru_ascii_poly.c:101</a></div></div>
<div class="ttc" id="structstring_html_aa6bcf0353fd5cf2f374a9b1dd0e4a73a"><div class="ttname"><a href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">string::len</a></div><div class="ttdeci">size_t len</div><div class="ttdef"><b>Definition:</b> <a href="ntru__string_8h_source.html#l00053">ntru_string.h:53</a></div></div>
<div class="ttc" id="ntru__encrypt_8c_html_a0156453c7cab7cf3da259beb1daf914b"><div class="ttname"><a href="ntru__encrypt_8c.html#a0156453c7cab7cf3da259beb1daf914b">ntru_encrypt_poly</a></div><div class="ttdeci">void ntru_encrypt_poly(const fmpz_poly_t msg_bin, const fmpz_poly_t pub_key, const fmpz_poly_t rnd, fmpz_poly_t out, const ntru_params *params)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__encrypt_8c_source.html#l00046">ntru_encrypt.c:46</a></div></div>
<div class="ttc" id="ntru__poly__ascii_8c_html_a0dc14698073df2e46e6540cbff870fc7"><div class="ttname"><a href="ntru__poly__ascii_8c.html#a0dc14698073df2e46e6540cbff870fc7">poly_arr_to_base64</a></div><div class="ttdeci">string * poly_arr_to_base64(const fmpz_poly_t **poly_array, const uint32_t poly_c, const ntru_params *params)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__poly__ascii_8c_source.html#l00264">ntru_poly_ascii.c:264</a></div></div>
<div class="ttc" id="ntru__poly_8c_html_ae7d0d8364dba689df3fb4904610634cc"><div class="ttname"><a href="ntru__poly_8c.html#ae7d0d8364dba689df3fb4904610634cc">fmpz_poly_mod_unsigned</a></div><div class="ttdeci">void fmpz_poly_mod_unsigned(fmpz_poly_t a, const uint32_t mod)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__poly_8c_source.html#l00166">ntru_poly.c:166</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="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__encrypt_8h_html"><div class="ttname"><a href="ntru__encrypt_8h.html">ntru_encrypt.h</a></div><div class="ttdoc">header for encrypt.c </div></div>
<div class="ttc" id="ntru__mem_8h_html"><div class="ttname"><a href="ntru__mem_8h.html">ntru_mem.h</a></div><div class="ttdoc">header for ntru_mem.c </div></div>
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<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__encrypt_8c_html_a0bb47c0fa0dd4a4cfa0c0f7a722fd554"><div class="ttname"><a href="ntru__encrypt_8c.html#a0bb47c0fa0dd4a4cfa0c0f7a722fd554">ntru_encrypt_string</a></div><div class="ttdeci">string * ntru_encrypt_string(const string *msg, const fmpz_poly_t pub_key, const fmpz_poly_t rnd, const ntru_params *params)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__encrypt_8c_source.html#l00074">ntru_encrypt.c:74</a></div></div>
<div class="ttc" id="ntru__poly_8c_html_ae96f479ddd97af709a0ed50817fd3fb3"><div class="ttname"><a href="ntru__poly_8c.html#ae96f479ddd97af709a0ed50817fd3fb3">poly_starmultiply</a></div><div class="ttdeci">void poly_starmultiply(const fmpz_poly_t a, const fmpz_poly_t b, fmpz_poly_t c, const ntru_params *params, uint32_t modulus)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__poly_8c_source.html#l00239">ntru_poly.c:239</a></div></div>
<div class="ttc" id="ntru__poly_8c_html_a3f53c63383ff301b20dcede0783869a7"><div class="ttname"><a href="ntru__poly_8c.html#a3f53c63383ff301b20dcede0783869a7">poly_delete_array</a></div><div class="ttdeci">void poly_delete_array(fmpz_poly_t **poly_array)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__poly_8c_source.html#l00131">ntru_poly.c:131</a></div></div>
<div class="ttc" id="structntru__params_html_a29680750bda49dc93e61a752b2f2a0f7"><div class="ttname"><a href="structntru__params.html#a29680750bda49dc93e61a752b2f2a0f7">ntru_params::q</a></div><div class="ttdeci">uint32_t q</div><div class="ttdef"><b>Definition:</b> <a href="ntru__params_8h_source.html#l00052">ntru_params.h:52</a></div></div>
<div class="ttc" id="ntru__string_8h_html"><div class="ttname"><a href="ntru__string_8h.html">ntru_string.h</a></div><div class="ttdoc">header for ntru_string.c </div></div>
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<div class="ttc" id="ntru__ascii__poly_8h_html"><div class="ttname"><a href="ntru__ascii__poly_8h.html">ntru_ascii_poly.h</a></div><div class="ttdoc">header for ntru_ascii_poly.c </div></div>
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