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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">ntru_file.c</div> </div>
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<a href="ntru__file_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__common_8h.html">ntru_common.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__err_8h.html">ntru_err.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__string_8h.html">ntru_string.h</a>&quot;</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor">#include &lt;fcntl.h&gt;</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#include &lt;stdbool.h&gt;</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="preprocessor">#include &lt;sys/stat.h&gt;</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="preprocessor">#include &lt;sys/types.h&gt;</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="preprocessor">#include &lt;unistd.h&gt;</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="ntru__file_8c.html#a15651456278c8f50777dfe104f492951"> 44</a></span>&#160;<span class="preprocessor">#define STD_FILE_BUF 4096</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;<span class="keywordtype">string</span> *</div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="ntru_8h.html#a348c2a56837571f410d44631abc09dc4"> 50</a></span>&#160;<a class="code" href="ntru__file_8c.html#a348c2a56837571f410d44631abc09dc4">read_file</a>(<span class="keywordtype">char</span> <span class="keyword">const</span> * <span class="keyword">const</span> filename)</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;{</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordtype">char</span> buf[<a class="code" href="ntru__file_8c.html#a15651456278c8f50777dfe104f492951">STD_FILE_BUF</a>],</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; *cstring = NULL;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="keywordtype">int</span> fd = 0;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordtype">size_t</span> str_size = 0;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; ssize_t n;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordtype">size_t</span> file_length = 0;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordtype">string</span> *result_string;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; fd = open(filename, O_RDONLY);</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; file_length = lseek(fd, 0, SEEK_END) + 1;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; lseek(fd, 0, SEEK_SET);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; cstring = malloc(<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>) * file_length);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordflow">if</span> (fd != -1) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">/* read and copy chunks */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">while</span> ((n = read(fd, buf, <a class="code" href="ntru__file_8c.html#a15651456278c8f50777dfe104f492951">STD_FILE_BUF</a>)) != 0) {</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; <span class="keywordflow">if</span> (n == -1) {</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <a class="code" href="ntru__err_8h.html#abcb6d051074ab3a58c5e9764f927753c">NTRU_WARN_DEBUG</a>(<span class="stringliteral">&quot;Failed while reading file descriptor %d&quot;</span>,</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; fd);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">goto</span> failure_cleanup;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; }</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; str_size += n; <span class="comment">/* count total bytes read */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="comment">/* append buffer to string */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; memcpy(cstring + (str_size - n), buf, (<span class="keywordtype">size_t</span>)n);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; }</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="comment">/* add trailing NULL byte */</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; cstring[str_size] = <span class="charliteral">&#39;\0&#39;</span>;</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> (close(fd)) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <a class="code" href="ntru__err_8h.html#abcb6d051074ab3a58c5e9764f927753c">NTRU_WARN_DEBUG</a>(<span class="stringliteral">&quot;Failed to close file descripter %d\n&quot;</span>, fd);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">goto</span> failure_cleanup;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; }</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; result_string = <a class="code" href="ntru__mem_8c.html#a020790bf8b201fde92395cf975c0c691">ntru_malloc</a>(<span class="keyword">sizeof</span>(*result_string));</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; result_string-&gt;<a class="code" href="structstring.html#afd608f62303958cea6f1f7afdec1e282">ptr</a> = cstring;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; result_string-&gt;<a class="code" href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">len</a> = str_size;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">return</span> result_string;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="keywordflow">return</span> NULL;</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;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;failure_cleanup:</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; free(cstring);</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">return</span> NULL;</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;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></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="keywordtype">bool</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="ntru_8h.html#af2a0fc4dd4109749d8f3100a913cc304"> 107</a></span>&#160;<a class="code" href="ntru__file_8c.html#a1f8eef5ea12c77ed2491d96864eb0d43">write_file</a>(<span class="keywordtype">string</span> <span class="keyword">const</span> *wstring, <span class="keywordtype">char</span> <span class="keyword">const</span> * <span class="keyword">const</span> filename)</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;{</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; FILE *fp;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; fp = fopen(filename, <span class="stringliteral">&quot;w&quot;</span>);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="keywordflow">if</span> (!fp) {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <a class="code" href="ntru__err_8h.html#abcb6d051074ab3a58c5e9764f927753c">NTRU_WARN_DEBUG</a>(<span class="stringliteral">&quot;Failed while creating file\n&quot;</span>);</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="keywordflow">for</span> (uint32_t i = 0; i &lt; wstring-&gt;<a class="code" href="structstring.html#aa6bcf0353fd5cf2f374a9b1dd0e4a73a">len</a>; i++)</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; fprintf(fp, <span class="stringliteral">&quot;%c&quot;</span>, wstring-&gt;<a class="code" href="structstring.html#afd608f62303958cea6f1f7afdec1e282">ptr</a>[i]);</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="keywordflow">if</span> (fclose(fp)) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <a class="code" href="ntru__err_8h.html#abcb6d051074ab3a58c5e9764f927753c">NTRU_WARN_DEBUG</a>(<span class="stringliteral">&quot;Failed to close file descripter\n&quot;</span>);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; }</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;}</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;<span class="comment">/*------------------------------------------------------------------------*/</span></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__file_8c_html_a1f8eef5ea12c77ed2491d96864eb0d43"><div class="ttname"><a href="ntru__file_8c.html#a1f8eef5ea12c77ed2491d96864eb0d43">write_file</a></div><div class="ttdeci">bool write_file(string const *wstring, char const *const filename)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__file_8c_source.html#l00107">ntru_file.c:107</a></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>
<div class="ttc" id="ntru__file_8c_html_a15651456278c8f50777dfe104f492951"><div class="ttname"><a href="ntru__file_8c.html#a15651456278c8f50777dfe104f492951">STD_FILE_BUF</a></div><div class="ttdeci">#define STD_FILE_BUF</div><div class="ttdef"><b>Definition:</b> <a href="ntru__file_8c_source.html#l00044">ntru_file.c:44</a></div></div>
<div class="ttc" id="ntru__file_8c_html_a348c2a56837571f410d44631abc09dc4"><div class="ttname"><a href="ntru__file_8c.html#a348c2a56837571f410d44631abc09dc4">read_file</a></div><div class="ttdeci">string * read_file(char const *const filename)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__file_8c_source.html#l00050">ntru_file.c:50</a></div></div>
<div class="ttc" id="ntru__common_8h_html"><div class="ttname"><a href="ntru__common_8h.html">ntru_common.h</a></div><div class="ttdoc">common macros/functions </div></div>
<div class="ttc" id="ntru__err_8h_html_abcb6d051074ab3a58c5e9764f927753c"><div class="ttname"><a href="ntru__err_8h.html#abcb6d051074ab3a58c5e9764f927753c">NTRU_WARN_DEBUG</a></div><div class="ttdeci">#define NTRU_WARN_DEBUG(...)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__err_8h_source.html#l00052">ntru_err.h:52</a></div></div>
<div class="ttc" id="ntru__err_8h_html"><div class="ttname"><a href="ntru__err_8h.html">ntru_err.h</a></div><div class="ttdoc">error handling </div></div>
<div class="ttc" id="ntru__mem_8c_html_a020790bf8b201fde92395cf975c0c691"><div class="ttname"><a href="ntru__mem_8c.html#a020790bf8b201fde92395cf975c0c691">ntru_malloc</a></div><div class="ttdeci">void * ntru_malloc(size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="ntru__mem_8c_source.html#l00038">ntru_mem.c:38</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>
<div class="ttc" id="structstring_html_afd608f62303958cea6f1f7afdec1e282"><div class="ttname"><a href="structstring.html#afd608f62303958cea6f1f7afdec1e282">string::ptr</a></div><div class="ttdeci">char * ptr</div><div class="ttdef"><b>Definition:</b> <a href="ntru__string_8h_source.html#l00049">ntru_string.h:49</a></div></div>
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