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<a href="hmac__drbg_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> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * HMAC_DRBG implementation (NIST SP 800-90)</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Copyright (C) 2014, Brainspark B.V.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This file is part of PolarSSL (http://www.polarssl.org)</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org></span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * This program is free software; you can redistribute it and/or modify</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * (at your option) any later version.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * GNU General Public License for more details.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * You should have received a copy of the GNU General Public License along</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * with this program; if not, write to the Free Software Foundation, Inc.,</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * The NIST SP 800-90A DRBGs are described in the following publication.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * http://csrc.nist.gov/publications/nistpubs/800-90A/SP800-90A.pdf</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * References below are based on rev. 1 (January 2012).</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#if !defined(POLARSSL_CONFIG_FILE)</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="config_8h.html">polarssl/config.h</a>"</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor"></span><span class="preprocessor">#include POLARSSL_CONFIG_FILE</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#if defined(POLARSSL_HMAC_DRBG_C)</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include "<a class="code" href="hmac__drbg_8h.html">polarssl/hmac_drbg.h</a>"</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#if defined(POLARSSL_FS_IO)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor"></span><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#if defined(POLARSSL_PLATFORM_C)</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="platform_8h.html">polarssl/platform.h</a>"</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor"></span><span class="preprocessor">#define polarssl_printf printf</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment">/* Implementation that should never be optimized out by the compiler */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">static</span> <span class="keywordtype">void</span> polarssl_zeroize( <span class="keywordtype">void</span> *v, <span class="keywordtype">size_t</span> n ) {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">volatile</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *p = v; <span class="keywordflow">while</span>( n-- ) *p++ = 0;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> }</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * HMAC_DRBG update, using optional additional data (10.1.2.2)</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keywordtype">void</span> <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx,</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *additional, <span class="keywordtype">size_t</span> add_len )</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">size_t</span> md_len = ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>.<a class="code" href="structmd__context__t.html#aa6e406b09866de4f065071fd0ae5b3f2">md_info</a>-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a>;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> rounds = ( additional != NULL && add_len != 0 ) ? 2 : 1;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> sep[1];</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> K[<a class="code" href="md_8h.html#a38c76a15d6a3874f898f3dc60750dde1">POLARSSL_MD_MAX_SIZE</a>];</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">for</span>( sep[0] = 0; sep[0] < rounds; sep[0]++ )</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  {</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">/* Step 1 or 4 */</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="md_8h.html#a2731cd88efb4f40f948789766cde73da">md_hmac_reset</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a> );</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <a class="code" href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, md_len );</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <a class="code" href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, sep, 1 );</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span>( rounds == 2 )</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, additional, add_len );</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="code" href="md_8h.html#ae4d71986a47097a6c320965c9656c81e">md_hmac_finish</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, K );</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">/* Step 2 or 5 */</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="code" href="md_8h.html#a8debd6277357faa47333bb4919b82058">md_hmac_starts</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, K, md_len );</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <a class="code" href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, md_len );</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <a class="code" href="md_8h.html#ae4d71986a47097a6c320965c9656c81e">md_hmac_finish</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a> );</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * Simplified HMAC_DRBG initialisation (for use with deterministic ECDSA)</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">int</span> <a class="code" href="hmac__drbg_8h.html#acd163a15df844543ab5b950f4d13d65f">hmac_drbg_init_buf</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx,</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">const</span> <a class="code" href="structmd__info__t.html">md_info_t</a> * md_info,</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *data, <span class="keywordtype">size_t</span> data_len )</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  memset( ctx, 0, <span class="keyword">sizeof</span>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> ) );</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <a class="code" href="md_8h.html#ae75802b88b5126acc245530be7d9607b">md_init</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a> );</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span>( ( ret = <a class="code" href="md_8h.html#a7c956b5c92531111312324c91b6d83f9">md_init_ctx</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, md_info ) ) != 0 )</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span>( ret );</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * Set initial working state.</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * Use the V memory location, which is currently all 0, to initialize the</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * MD context with an all-zero key. Then set V to its initial value.</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <a class="code" href="md_8h.html#a8debd6277357faa47333bb4919b82058">md_hmac_starts</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> );</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  memset( ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, 0x01, md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> );</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( ctx, data, data_len );</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> }</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * HMAC_DRBG reseeding: 10.1.2.4 (arabic) + 9.2 (Roman)</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="keywordtype">int</span> <a class="code" href="hmac__drbg_8h.html#a881091e2fc00dd15f3eb44e47bafd180">hmac_drbg_reseed</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx,</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *additional, <span class="keywordtype">size_t</span> len )</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> seed[<a class="code" href="hmac__drbg_8h.html#a0118d9721a45e6c2e784d5ddb7a93dd9">POLARSSL_HMAC_DRBG_MAX_SEED_INPUT</a>];</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordtype">size_t</span> seedlen;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">/* III. Check input length */</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span>( len > <a class="code" href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a> ||</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a> + len > <a class="code" href="hmac__drbg_8h.html#a0118d9721a45e6c2e784d5ddb7a93dd9">POLARSSL_HMAC_DRBG_MAX_SEED_INPUT</a> )</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a63ba4f9a4e98f5d1af93e33c3e1fe3b5">POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG</a> );</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  memset( seed, 0, <a class="code" href="hmac__drbg_8h.html#a0118d9721a45e6c2e784d5ddb7a93dd9">POLARSSL_HMAC_DRBG_MAX_SEED_INPUT</a> );</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">/* IV. Gather entropy_len bytes of entropy for the seed */</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">if</span>( ctx-><a class="code" href="structhmac__drbg__context.html#a240b25c07cb7600e1b8297b655c39196">f_entropy</a>( ctx-><a class="code" href="structhmac__drbg__context.html#ae9a222cf524533d74c84dbd44406baf3">p_entropy</a>, seed, ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a> ) != 0 )</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a0d9472d39e70c4eeb3cb06177c3012f8">POLARSSL_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED</a> );</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  seedlen = ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a>;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">/* 1. Concatenate entropy and additional data if any */</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span>( additional != NULL && len != 0 )</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  {</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  memcpy( seed + seedlen, additional, len );</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  seedlen += len;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">/* 2. Update state */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( ctx, seed, seedlen );</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">/* 3. Reset reseed_counter */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a1bcf4e63608464d20a75486f6a8d2eba">reseed_counter</a> = 1;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">/* 4. Done */</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> * HMAC_DRBG initialisation (10.1.2.3 + 9.1)</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="keywordtype">int</span> <a class="code" href="hmac__drbg_8h.html#a9c45dacf4f93959d2978b07df9f3231e">hmac_drbg_init</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx,</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keyword">const</span> <a class="code" href="structmd__info__t.html">md_info_t</a> * md_info,</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordtype">int</span> (*f_entropy)(<span class="keywordtype">void</span> *, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *, <span class="keywordtype">size_t</span>),</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordtype">void</span> *p_entropy,</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *custom,</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordtype">size_t</span> len )</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> {</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">size_t</span> entropy_len;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  memset( ctx, 0, <span class="keyword">sizeof</span>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> ) );</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="md_8h.html#ae75802b88b5126acc245530be7d9607b">md_init</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a> );</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span>( ( ret = <a class="code" href="md_8h.html#a7c956b5c92531111312324c91b6d83f9">md_init_ctx</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, md_info ) ) != 0 )</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">return</span>( ret );</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> * Set initial working state.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> * Use the V memory location, which is currently all 0, to initialize the</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> * MD context with an all-zero key. Then set V to its initial value.</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <a class="code" href="md_8h.html#a8debd6277357faa47333bb4919b82058">md_hmac_starts</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> );</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  memset( ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, 0x01, md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> );</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a240b25c07cb7600e1b8297b655c39196">f_entropy</a> = f_entropy;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  ctx-><a class="code" href="structhmac__drbg__context.html#ae9a222cf524533d74c84dbd44406baf3">p_entropy</a> = p_entropy;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a43d2193b71699be512441df40b876008">reseed_interval</a> = <a class="code" href="hmac__drbg_8h.html#aa3d9fee8fa351e1e9c828f39f63e89f7">POLARSSL_HMAC_DRBG_RESEED_INTERVAL</a>;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> </div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> * See SP800-57 5.6.1 (p. 65-66) for the security strength provided by</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * each hash function, then according to SP800-90A rev1 10.1 table 2,</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> * min_entropy_len (in bits) is security_strength.</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * (This also matches the sizes used in the NIST test vectors.)</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  entropy_len = md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> <= 20 ? 16 : <span class="comment">/* 160-bits hash -> 128 bits */</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  md_info-><a class="code" href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">size</a> <= 28 ? 24 : <span class="comment">/* 224-bits hash -> 192 bits */</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  32; <span class="comment">/* better (256+) -> 256 bits */</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * For initialisation, use more entropy to emulate a nonce</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"> * (Again, matches test vectors.)</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a> = entropy_len * 3 / 2;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> </div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">if</span>( ( ret = <a class="code" href="hmac__drbg_8h.html#a881091e2fc00dd15f3eb44e47bafd180">hmac_drbg_reseed</a>( ctx, custom, len ) ) != 0 )</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">return</span>( ret );</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a> = entropy_len;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> }</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"> * Set prediction resistance</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="keywordtype">void</span> <a class="code" href="hmac__drbg_8h.html#aaa415a1f75ea2656beb72e26c68cbe89">hmac_drbg_set_prediction_resistance</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx,</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordtype">int</span> resistance )</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> {</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  ctx-><a class="code" href="structhmac__drbg__context.html#abe5a16c6fabcb6783df5d1b3065d9c77">prediction_resistance</a> = resistance;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> }</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> * Set entropy length grabbed for reseeds</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="keywordtype">void</span> <a class="code" href="hmac__drbg_8h.html#a13a01d030a558fc0cea9fa2b5c66da8a">hmac_drbg_set_entropy_len</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx, <span class="keywordtype">size_t</span> len )</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> {</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">entropy_len</a> = len;</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> }</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * Set reseed interval</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="keywordtype">void</span> <a class="code" href="hmac__drbg_8h.html#ae06ae3e9279e4e6a9023f469725c8227">hmac_drbg_set_reseed_interval</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx, <span class="keywordtype">int</span> interval )</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> {</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a43d2193b71699be512441df40b876008">reseed_interval</a> = interval;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> }</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> </div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * HMAC_DRBG random function with optional additional data:</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * 10.1.2.5 (arabic) + 9.3 (Roman)</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="keywordtype">int</span> <a class="code" href="hmac__drbg_8h.html#ad73affb17b14ea45ee6cd3cf95187724">hmac_drbg_random_with_add</a>( <span class="keywordtype">void</span> *p_rng,</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *output, <span class="keywordtype">size_t</span> out_len,</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *additional, <span class="keywordtype">size_t</span> add_len )</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> {</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx = (<a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *) p_rng;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordtype">size_t</span> md_len = <a class="code" href="md_8h.html#a3e688fee63e53a616d031d6319c07372">md_get_size</a>( ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>.<a class="code" href="structmd__context__t.html#aa6e406b09866de4f065071fd0ae5b3f2">md_info</a> );</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordtype">size_t</span> left = out_len;</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *out = output;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="comment">/* II. Check request length */</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">if</span>( out_len > <a class="code" href="hmac__drbg_8h.html#a818a91c1f898a6e1ade715a0e3acd366">POLARSSL_HMAC_DRBG_MAX_REQUEST</a> )</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a4d06fc2204001f56acb2a1eabfbbf036">POLARSSL_ERR_HMAC_DRBG_REQUEST_TOO_BIG</a> );</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="comment">/* III. Check input length */</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">if</span>( add_len > <a class="code" href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a> )</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a63ba4f9a4e98f5d1af93e33c3e1fe3b5">POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG</a> );</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="comment">/* 1. (aka VII and IX) Check reseed counter and PR */</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="keywordflow">if</span>( ctx-><a class="code" href="structhmac__drbg__context.html#a240b25c07cb7600e1b8297b655c39196">f_entropy</a> != NULL && <span class="comment">/* For no-reseeding instances */</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  ( ctx-><a class="code" href="structhmac__drbg__context.html#abe5a16c6fabcb6783df5d1b3065d9c77">prediction_resistance</a> == <a class="code" href="hmac__drbg_8h.html#a48149f1fd6d91c46a1a4f1574cd65653">POLARSSL_HMAC_DRBG_PR_ON</a> ||</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a1bcf4e63608464d20a75486f6a8d2eba">reseed_counter</a> > ctx-><a class="code" href="structhmac__drbg__context.html#a43d2193b71699be512441df40b876008">reseed_interval</a> ) )</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  {</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">if</span>( ( ret = <a class="code" href="hmac__drbg_8h.html#a881091e2fc00dd15f3eb44e47bafd180">hmac_drbg_reseed</a>( ctx, additional, add_len ) ) != 0 )</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">return</span>( ret );</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  add_len = 0; <span class="comment">/* VII.4 */</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  }</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="comment">/* 2. Use additional data if any */</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">if</span>( additional != NULL && add_len != 0 )</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( ctx, additional, add_len );</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> </div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">/* 3, 4, 5. Generate bytes */</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">while</span>( left != 0 )</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  {</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordtype">size_t</span> use_len = left > md_len ? md_len : left;</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <a class="code" href="md_8h.html#a2731cd88efb4f40f948789766cde73da">md_hmac_reset</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a> );</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, md_len );</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <a class="code" href="md_8h.html#ae4d71986a47097a6c320965c9656c81e">md_hmac_finish</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a>, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a> );</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> </div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  memcpy( out, ctx-><a class="code" href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">V</a>, use_len );</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  out += use_len;</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  left -= use_len;</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  }</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="comment">/* 6. Update */</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( ctx, additional, add_len );</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="comment">/* 7. Update reseed counter */</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  ctx-><a class="code" href="structhmac__drbg__context.html#a1bcf4e63608464d20a75486f6a8d2eba">reseed_counter</a>++;</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">/* 8. Done */</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> }</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> </div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> * HMAC_DRBG random function</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="keywordtype">int</span> <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( <span class="keywordtype">void</span> *p_rng, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *output, <span class="keywordtype">size_t</span> out_len )</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> {</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#ad73affb17b14ea45ee6cd3cf95187724">hmac_drbg_random_with_add</a>( p_rng, output, out_len, NULL, 0 ) );</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> }</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="comment"> * Free an HMAC_DRBG context</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="keywordtype">void</span> <a class="code" href="hmac__drbg_8h.html#a3a0bf86f3afd2e39cbb3c3a08faf5e44">hmac_drbg_free</a>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx )</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> {</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordflow">if</span>( ctx == NULL )</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <a class="code" href="md_8h.html#a3312061daf9ecc722c025cdbee9c38cc">md_free_ctx</a>( &ctx-><a class="code" href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">md_ctx</a> );</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> </div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  polarssl_zeroize( ctx, <span class="keyword">sizeof</span>( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> ) );</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> }</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="preprocessor">#if defined(POLARSSL_FS_IO)</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="preprocessor"></span><span class="keywordtype">int</span> hmac_drbg_write_seed_file( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx, <span class="keyword">const</span> <span class="keywordtype">char</span> *path )</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> {</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="keywordtype">int</span> ret;</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  FILE *f;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buf[ <a class="code" href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a> ];</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> </div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">if</span>( ( f = fopen( path, <span class="stringliteral">"wb"</span> ) ) == NULL )</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a6a560c35edcfca2ab71f39e2c70d50c8">POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</a> );</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> </div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">if</span>( ( ret = <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( ctx, buf, <span class="keyword">sizeof</span>( buf ) ) ) != 0 )</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordflow">goto</span> exit;</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span>( fwrite( buf, 1, <span class="keyword">sizeof</span>( buf ), f ) != <span class="keyword">sizeof</span>( buf ) )</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  {</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  ret = <a class="code" href="hmac__drbg_8h.html#a6a560c35edcfca2ab71f39e2c70d50c8">POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</a>;</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="keywordflow">goto</span> exit;</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  }</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> </div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  ret = 0;</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> </div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> exit:</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  fclose( f );</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="keywordflow">return</span>( ret );</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> }</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> </div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="keywordtype">int</span> hmac_drbg_update_seed_file( <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> *ctx, <span class="keyword">const</span> <span class="keywordtype">char</span> *path )</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> {</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  FILE *f;</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  <span class="keywordtype">size_t</span> n;</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buf[ <a class="code" href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a> ];</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> </div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <span class="keywordflow">if</span>( ( f = fopen( path, <span class="stringliteral">"rb"</span> ) ) == NULL )</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a6a560c35edcfca2ab71f39e2c70d50c8">POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</a> );</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> </div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  fseek( f, 0, SEEK_END );</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  n = (size_t) ftell( f );</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  fseek( f, 0, SEEK_SET );</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> </div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="keywordflow">if</span>( n > <a class="code" href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a> )</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  {</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  fclose( f );</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a63ba4f9a4e98f5d1af93e33c3e1fe3b5">POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG</a> );</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  }</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> </div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="keywordflow">if</span>( fread( buf, 1, n, f ) != n )</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  {</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  fclose( f );</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">return</span>( <a class="code" href="hmac__drbg_8h.html#a6a560c35edcfca2ab71f39e2c70d50c8">POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</a> );</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  }</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> </div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  fclose( f );</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> </div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <a class="code" href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a>( ctx, buf, n );</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> </div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="keywordflow">return</span>( hmac_drbg_write_seed_file( ctx, path ) );</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> }</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="preprocessor">#endif </span><span class="comment">/* POLARSSL_FS_IO */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="preprocessor">#if defined(POLARSSL_SELF_TEST)</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> </div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#if !defined(POLARSSL_SHA1_C)</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="preprocessor"></span><span class="comment">/* Dummy checkup routine */</span></div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="keywordtype">int</span> hmac_drbg_self_test( <span class="keywordtype">int</span> verbose )</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> {</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> </div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">"\n"</span> );</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> </div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> }</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span> <span class="preprocessor">#define OUTPUT_LEN 80</span></div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> <span class="comment">/* From a NIST PR=true test vector */</span></div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> entropy_pr[] = {</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  0xa0, 0xc9, 0xab, 0x58, 0xf1, 0xe2, 0xe5, 0xa4, 0xde, 0x3e, 0xbd, 0x4f,</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  0xf7, 0x3e, 0x9c, 0x5b, 0x64, 0xef, 0xd8, 0xca, 0x02, 0x8c, 0xf8, 0x11,</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  0x48, 0xa5, 0x84, 0xfe, 0x69, 0xab, 0x5a, 0xee, 0x42, 0xaa, 0x4d, 0x42,</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  0x17, 0x60, 0x99, 0xd4, 0x5e, 0x13, 0x97, 0xdc, 0x40, 0x4d, 0x86, 0xa3,</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  0x7b, 0xf5, 0x59, 0x54, 0x75, 0x69, 0x51, 0xe4 };</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> result_pr[OUTPUT_LEN] = {</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  0x9a, 0x00, 0xa2, 0xd0, 0x0e, 0xd5, 0x9b, 0xfe, 0x31, 0xec, 0xb1, 0x39,</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  0x9b, 0x60, 0x81, 0x48, 0xd1, 0x96, 0x9d, 0x25, 0x0d, 0x3c, 0x1e, 0x94,</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  0x10, 0x10, 0x98, 0x12, 0x93, 0x25, 0xca, 0xb8, 0xfc, 0xcc, 0x2d, 0x54,</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  0x73, 0x19, 0x70, 0xc0, 0x10, 0x7a, 0xa4, 0x89, 0x25, 0x19, 0x95, 0x5e,</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  0x4b, 0xc6, 0x00, 0x1d, 0x7f, 0x4e, 0x6a, 0x2b, 0xf8, 0xa3, 0x01, 0xab,</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  0x46, 0x05, 0x5c, 0x09, 0xa6, 0x71, 0x88, 0xf1, 0xa7, 0x40, 0xee, 0xf3,</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  0xe1, 0x5c, 0x02, 0x9b, 0x44, 0xaf, 0x03, 0x44 };</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> </div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span> <span class="comment">/* From a NIST PR=false test vector */</span></div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> entropy_nopr[] = {</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  0x79, 0x34, 0x9b, 0xbf, 0x7c, 0xdd, 0xa5, 0x79, 0x95, 0x57, 0x86, 0x66,</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  0x21, 0xc9, 0x13, 0x83, 0x11, 0x46, 0x73, 0x3a, 0xbf, 0x8c, 0x35, 0xc8,</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  0xc7, 0x21, 0x5b, 0x5b, 0x96, 0xc4, 0x8e, 0x9b, 0x33, 0x8c, 0x74, 0xe3,</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  0xe9, 0x9d, 0xfe, 0xdf };</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> result_nopr[OUTPUT_LEN] = {</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  0xc6, 0xa1, 0x6a, 0xb8, 0xd4, 0x20, 0x70, 0x6f, 0x0f, 0x34, 0xab, 0x7f,</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  0xec, 0x5a, 0xdc, 0xa9, 0xd8, 0xca, 0x3a, 0x13, 0x3e, 0x15, 0x9c, 0xa6,</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  0xac, 0x43, 0xc6, 0xf8, 0xa2, 0xbe, 0x22, 0x83, 0x4a, 0x4c, 0x0a, 0x0a,</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  0xff, 0xb1, 0x0d, 0x71, 0x94, 0xf1, 0xc1, 0xa5, 0xcf, 0x73, 0x22, 0xec,</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  0x1a, 0xe0, 0x96, 0x4e, 0xd4, 0xbf, 0x12, 0x27, 0x46, 0xe0, 0x87, 0xfd,</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  0xb5, 0xb3, 0xe9, 0x1b, 0x34, 0x93, 0xd5, 0xbb, 0x98, 0xfa, 0xed, 0x49,</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  0xe8, 0x5f, 0x13, 0x0f, 0xc8, 0xa4, 0x59, 0xb7 };</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> </div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> <span class="comment">/* "Entropy" from buffer */</span></div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span> <span class="keyword">static</span> <span class="keywordtype">size_t</span> test_offset;</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> <span class="keyword">static</span> <span class="keywordtype">int</span> hmac_drbg_self_test_entropy( <span class="keywordtype">void</span> *data,</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> len )</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> {</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *p = data;</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  memcpy( buf, p + test_offset, len );</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  test_offset += len;</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> }</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> </div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> <span class="preprocessor">#define CHK( c ) if( (c) != 0 ) \</span></div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="preprocessor"> { \</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="preprocessor"> if( verbose != 0 ) \</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="preprocessor"> polarssl_printf( "failed\n" ); \</span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="preprocessor"> return( 1 ); \</span></div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> <span class="preprocessor"> }</span></div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="comment"> * Checkup routine for HMAC_DRBG with SHA-1</span></div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> <span class="keywordtype">int</span> hmac_drbg_self_test( <span class="keywordtype">int</span> verbose )</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> {</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  <a class="code" href="structhmac__drbg__context.html">hmac_drbg_context</a> ctx;</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> buf[OUTPUT_LEN];</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  <span class="keyword">const</span> <a class="code" href="structmd__info__t.html">md_info_t</a> *md_info = <a class="code" href="md_8h.html#a622c94870533dc68f54b8df520d2c6d9">md_info_from_type</a>( <a class="code" href="md_8h.html#af1fbbb67afa0daee4090cde8864e0b68a3d59000e02cfa0867e14002d95046335">POLARSSL_MD_SHA1</a> );</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> </div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span> <span class="comment"> * PR = True</span></div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">" HMAC_DRBG (PR = True) : "</span> );</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span> </div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  test_offset = 0;</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  CHK( <a class="code" href="hmac__drbg_8h.html#a9c45dacf4f93959d2978b07df9f3231e">hmac_drbg_init</a>( &ctx, md_info,</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  hmac_drbg_self_test_entropy, entropy_pr,</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  NULL, 0 ) );</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  <a class="code" href="hmac__drbg_8h.html#aaa415a1f75ea2656beb72e26c68cbe89">hmac_drbg_set_prediction_resistance</a>( &ctx, <a class="code" href="hmac__drbg_8h.html#a48149f1fd6d91c46a1a4f1574cd65653">POLARSSL_HMAC_DRBG_PR_ON</a> );</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  CHK( <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( &ctx, buf, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  CHK( <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( &ctx, buf, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  CHK( memcmp( buf, result_pr, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  <a class="code" href="hmac__drbg_8h.html#a3a0bf86f3afd2e39cbb3c3a08faf5e44">hmac_drbg_free</a>( &ctx );</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> </div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">"passed\n"</span> );</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> </div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="comment"> * PR = False</span></div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">" HMAC_DRBG (PR = False) : "</span> );</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> </div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  test_offset = 0;</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  CHK( <a class="code" href="hmac__drbg_8h.html#a9c45dacf4f93959d2978b07df9f3231e">hmac_drbg_init</a>( &ctx, md_info,</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  hmac_drbg_self_test_entropy, entropy_nopr,</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  NULL, 0 ) );</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  CHK( <a class="code" href="hmac__drbg_8h.html#a881091e2fc00dd15f3eb44e47bafd180">hmac_drbg_reseed</a>( &ctx, NULL, 0 ) );</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  CHK( <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( &ctx, buf, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  CHK( <a class="code" href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a>( &ctx, buf, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  CHK( memcmp( buf, result_nopr, OUTPUT_LEN ) );</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <a class="code" href="hmac__drbg_8h.html#a3a0bf86f3afd2e39cbb3c3a08faf5e44">hmac_drbg_free</a>( &ctx );</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> </div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">"passed\n"</span> );</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span> </div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  <span class="keywordflow">if</span>( verbose != 0 )</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <a class="code" href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a>( <span class="stringliteral">"\n"</span> );</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span> </div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="keywordflow">return</span>( 0 );</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span> }</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span> <span class="preprocessor">#endif </span><span class="comment">/* POLARSSL_SHA1_C */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* POLARSSL_SELF_TEST */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span> <span class="preprocessor">#endif </span><span class="comment">/* POLARSSL_HMAC_DRBG_C */</span><span class="preprocessor"></span></div>
<div class="ttc" id="structhmac__drbg__context_html_a1a65ebc3659a318fe1e692db220b6c6c"><div class="ttname"><a href="structhmac__drbg__context.html#a1a65ebc3659a318fe1e692db220b6c6c">hmac_drbg_context::V</a></div><div class="ttdeci">unsigned char V[POLARSSL_MD_MAX_SIZE]</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00081">hmac_drbg.h:81</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_ad42367f0fecb12f9962f0798857b86ae"><div class="ttname"><a href="hmac__drbg_8h.html#ad42367f0fecb12f9962f0798857b86ae">POLARSSL_HMAC_DRBG_MAX_INPUT</a></div><div class="ttdeci">#define POLARSSL_HMAC_DRBG_MAX_INPUT</div><div class="ttdoc">Maximum number of additional input bytes. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00053">hmac_drbg.h:53</a></div></div>
<div class="ttc" id="test__suite__aes_8cbc_8c_html_afc6a7362c0f0c9cfa8fc76b3281e2b37"><div class="ttname"><a href="test__suite__aes_8cbc_8c.html#afc6a7362c0f0c9cfa8fc76b3281e2b37">polarssl_printf</a></div><div class="ttdeci">#define polarssl_printf</div><div class="ttdef"><b>Definition:</b> <a href="test__suite__aes_8cbc_8c_source.html#l00309">test_suite_aes.cbc.c:309</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_aa3d9fee8fa351e1e9c828f39f63e89f7"><div class="ttname"><a href="hmac__drbg_8h.html#aa3d9fee8fa351e1e9c828f39f63e89f7">POLARSSL_HMAC_DRBG_RESEED_INTERVAL</a></div><div class="ttdeci">#define POLARSSL_HMAC_DRBG_RESEED_INTERVAL</div><div class="ttdoc">Interval before reseed is performed by default. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00049">hmac_drbg.h:49</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a13a01d030a558fc0cea9fa2b5c66da8a"><div class="ttname"><a href="hmac__drbg_8h.html#a13a01d030a558fc0cea9fa2b5c66da8a">hmac_drbg_set_entropy_len</a></div><div class="ttdeci">void hmac_drbg_set_entropy_len(hmac_drbg_context *ctx, size_t len)</div><div class="ttdoc">Set the amount of entropy grabbed on each reseed (Default: given by the security strength, which depends on the hash used, see hmac_drbg_init() ) </div></div>
<div class="ttc" id="structhmac__drbg__context_html_a240b25c07cb7600e1b8297b655c39196"><div class="ttname"><a href="structhmac__drbg__context.html#a240b25c07cb7600e1b8297b655c39196">hmac_drbg_context::f_entropy</a></div><div class="ttdeci">int(* f_entropy)(void *, unsigned char *, size_t)</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00091">hmac_drbg.h:91</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_ab2f1d201eaba90dc66b7033fa87c1eb9"><div class="ttname"><a href="hmac__drbg_8h.html#ab2f1d201eaba90dc66b7033fa87c1eb9">hmac_drbg_random</a></div><div class="ttdeci">int hmac_drbg_random(void *p_rng, unsigned char *output, size_t out_len)</div><div class="ttdoc">HMAC_DRBG generate random. </div></div>
<div class="ttc" id="hmac__drbg_8h_html_ae06ae3e9279e4e6a9023f469725c8227"><div class="ttname"><a href="hmac__drbg_8h.html#ae06ae3e9279e4e6a9023f469725c8227">hmac_drbg_set_reseed_interval</a></div><div class="ttdeci">void hmac_drbg_set_reseed_interval(hmac_drbg_context *ctx, int interval)</div><div class="ttdoc">Set the reseed interval (Default: POLARSSL_HMAC_DRBG_RESEED_INTERVAL) </div></div>
<div class="ttc" id="md_8h_html_ae75802b88b5126acc245530be7d9607b"><div class="ttname"><a href="md_8h.html#ae75802b88b5126acc245530be7d9607b">md_init</a></div><div class="ttdeci">void md_init(md_context_t *ctx)</div><div class="ttdoc">Initialize a md_context (as NONE) </div></div>
<div class="ttc" id="hmac__drbg_8h_html_a0d9472d39e70c4eeb3cb06177c3012f8"><div class="ttname"><a href="hmac__drbg_8h.html#a0d9472d39e70c4eeb3cb06177c3012f8">POLARSSL_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED</a></div><div class="ttdeci">#define POLARSSL_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED</div><div class="ttdoc">The entropy source failed. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00038">hmac_drbg.h:38</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a818a91c1f898a6e1ade715a0e3acd366"><div class="ttname"><a href="hmac__drbg_8h.html#a818a91c1f898a6e1ade715a0e3acd366">POLARSSL_HMAC_DRBG_MAX_REQUEST</a></div><div class="ttdeci">#define POLARSSL_HMAC_DRBG_MAX_REQUEST</div><div class="ttdoc">Maximum number of requested bytes per call. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00057">hmac_drbg.h:57</a></div></div>
<div class="ttc" id="md_8h_html_a7c956b5c92531111312324c91b6d83f9"><div class="ttname"><a href="md_8h.html#a7c956b5c92531111312324c91b6d83f9">md_init_ctx</a></div><div class="ttdeci">int md_init_ctx(md_context_t *ctx, const md_info_t *md_info)</div><div class="ttdoc">Initialises and fills the message digest context structure with the appropriate values. </div></div>
<div class="ttc" id="config_8h_html"><div class="ttname"><a href="config_8h.html">config.h</a></div><div class="ttdoc">Configuration options (set of defines) </div></div>
<div class="ttc" id="md_8h_html_a3e688fee63e53a616d031d6319c07372"><div class="ttname"><a href="md_8h.html#a3e688fee63e53a616d031d6319c07372">md_get_size</a></div><div class="ttdeci">static unsigned char md_get_size(const md_info_t *md_info)</div><div class="ttdoc">Returns the size of the message digest output. </div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00225">md.h:225</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a63ba4f9a4e98f5d1af93e33c3e1fe3b5"><div class="ttname"><a href="hmac__drbg_8h.html#a63ba4f9a4e98f5d1af93e33c3e1fe3b5">POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG</a></div><div class="ttdeci">#define POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG</div><div class="ttdoc">Input too large (Entropy + additional). </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00036">hmac_drbg.h:36</a></div></div>
<div class="ttc" id="platform_8h_html"><div class="ttname"><a href="platform_8h.html">platform.h</a></div><div class="ttdoc">PolarSSL Platform abstraction layer. </div></div>
<div class="ttc" id="hmac__drbg_8h_html_a48149f1fd6d91c46a1a4f1574cd65653"><div class="ttname"><a href="hmac__drbg_8h.html#a48149f1fd6d91c46a1a4f1574cd65653">POLARSSL_HMAC_DRBG_PR_ON</a></div><div class="ttdeci">#define POLARSSL_HMAC_DRBG_PR_ON</div><div class="ttdoc">Prediction resistance enabled. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00067">hmac_drbg.h:67</a></div></div>
<div class="ttc" id="structmd__context__t_html_aa6e406b09866de4f065071fd0ae5b3f2"><div class="ttname"><a href="structmd__context__t.html#aa6e406b09866de4f065071fd0ae5b3f2">md_context_t::md_info</a></div><div class="ttdeci">const md_info_t * md_info</div><div class="ttdoc">Information about the associated message digest. </div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00134">md.h:134</a></div></div>
<div class="ttc" id="md_8h_html_a622c94870533dc68f54b8df520d2c6d9"><div class="ttname"><a href="md_8h.html#a622c94870533dc68f54b8df520d2c6d9">md_info_from_type</a></div><div class="ttdeci">const md_info_t * md_info_from_type(md_type_t md_type)</div><div class="ttdoc">Returns the message digest information associated with the given digest type. </div></div>
<div class="ttc" id="hmac__drbg_8h_html_a0118d9721a45e6c2e784d5ddb7a93dd9"><div class="ttname"><a href="hmac__drbg_8h.html#a0118d9721a45e6c2e784d5ddb7a93dd9">POLARSSL_HMAC_DRBG_MAX_SEED_INPUT</a></div><div class="ttdeci">#define POLARSSL_HMAC_DRBG_MAX_SEED_INPUT</div><div class="ttdoc">Maximum size of (re)seed buffer. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00061">hmac_drbg.h:61</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a6a560c35edcfca2ab71f39e2c70d50c8"><div class="ttname"><a href="hmac__drbg_8h.html#a6a560c35edcfca2ab71f39e2c70d50c8">POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</a></div><div class="ttdeci">#define POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR</div><div class="ttdoc">Read/write error in file. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00037">hmac_drbg.h:37</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a881091e2fc00dd15f3eb44e47bafd180"><div class="ttname"><a href="hmac__drbg_8h.html#a881091e2fc00dd15f3eb44e47bafd180">hmac_drbg_reseed</a></div><div class="ttdeci">int hmac_drbg_reseed(hmac_drbg_context *ctx, const unsigned char *additional, size_t len)</div><div class="ttdoc">HMAC_DRBG reseeding (extracts data from entropy source) </div></div>
<div class="ttc" id="structhmac__drbg__context_html"><div class="ttname"><a href="structhmac__drbg__context.html">hmac_drbg_context</a></div><div class="ttdoc">HMAC_DRBG context. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00076">hmac_drbg.h:76</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a3a0bf86f3afd2e39cbb3c3a08faf5e44"><div class="ttname"><a href="hmac__drbg_8h.html#a3a0bf86f3afd2e39cbb3c3a08faf5e44">hmac_drbg_free</a></div><div class="ttdeci">void hmac_drbg_free(hmac_drbg_context *ctx)</div><div class="ttdoc">Free an HMAC_DRBG context. </div></div>
<div class="ttc" id="structhmac__drbg__context_html_ae9a222cf524533d74c84dbd44406baf3"><div class="ttname"><a href="structhmac__drbg__context.html#ae9a222cf524533d74c84dbd44406baf3">hmac_drbg_context::p_entropy</a></div><div class="ttdeci">void * p_entropy</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00092">hmac_drbg.h:92</a></div></div>
<div class="ttc" id="md_8h_html_a8debd6277357faa47333bb4919b82058"><div class="ttname"><a href="md_8h.html#a8debd6277357faa47333bb4919b82058">md_hmac_starts</a></div><div class="ttdeci">int md_hmac_starts(md_context_t *ctx, const unsigned char *key, size_t keylen)</div><div class="ttdoc">Generic HMAC context setup. </div></div>
<div class="ttc" id="hmac__drbg_8h_html_aaa415a1f75ea2656beb72e26c68cbe89"><div class="ttname"><a href="hmac__drbg_8h.html#aaa415a1f75ea2656beb72e26c68cbe89">hmac_drbg_set_prediction_resistance</a></div><div class="ttdeci">void hmac_drbg_set_prediction_resistance(hmac_drbg_context *ctx, int resistance)</div><div class="ttdoc">Enable / disable prediction resistance (Default: Off) </div></div>
<div class="ttc" id="md_8h_html_a2731cd88efb4f40f948789766cde73da"><div class="ttname"><a href="md_8h.html#a2731cd88efb4f40f948789766cde73da">md_hmac_reset</a></div><div class="ttdeci">int md_hmac_reset(md_context_t *ctx)</div><div class="ttdoc">Generic HMAC context reset. </div></div>
<div class="ttc" id="hmac__drbg_8h_html_a4d06fc2204001f56acb2a1eabfbbf036"><div class="ttname"><a href="hmac__drbg_8h.html#a4d06fc2204001f56acb2a1eabfbbf036">POLARSSL_ERR_HMAC_DRBG_REQUEST_TOO_BIG</a></div><div class="ttdeci">#define POLARSSL_ERR_HMAC_DRBG_REQUEST_TOO_BIG</div><div class="ttdoc">Too many random requested in single call. </div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00035">hmac_drbg.h:35</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_a9c45dacf4f93959d2978b07df9f3231e"><div class="ttname"><a href="hmac__drbg_8h.html#a9c45dacf4f93959d2978b07df9f3231e">hmac_drbg_init</a></div><div class="ttdeci">int hmac_drbg_init(hmac_drbg_context *ctx, const md_info_t *md_info, int(*f_entropy)(void *, unsigned char *, size_t), void *p_entropy, const unsigned char *custom, size_t len)</div><div class="ttdoc">HMAC_DRBG initialisation. </div></div>
<div class="ttc" id="md_8h_html_a4a371673a6250979460217e4e74a0d33"><div class="ttname"><a href="md_8h.html#a4a371673a6250979460217e4e74a0d33">md_hmac_update</a></div><div class="ttdeci">int md_hmac_update(md_context_t *ctx, const unsigned char *input, size_t ilen)</div><div class="ttdoc">Generic HMAC process buffer. </div></div>
<div class="ttc" id="md_8h_html_a38c76a15d6a3874f898f3dc60750dde1"><div class="ttname"><a href="md_8h.html#a38c76a15d6a3874f898f3dc60750dde1">POLARSSL_MD_MAX_SIZE</a></div><div class="ttdeci">#define POLARSSL_MD_MAX_SIZE</div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00067">md.h:67</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_ad73affb17b14ea45ee6cd3cf95187724"><div class="ttname"><a href="hmac__drbg_8h.html#ad73affb17b14ea45ee6cd3cf95187724">hmac_drbg_random_with_add</a></div><div class="ttdeci">int hmac_drbg_random_with_add(void *p_rng, unsigned char *output, size_t output_len, const unsigned char *additional, size_t add_len)</div><div class="ttdoc">HMAC_DRBG generate random with additional update input. </div></div>
<div class="ttc" id="structhmac__drbg__context_html_a83469b6f20cd1d89fabe853c2531ff8e"><div class="ttname"><a href="structhmac__drbg__context.html#a83469b6f20cd1d89fabe853c2531ff8e">hmac_drbg_context::md_ctx</a></div><div class="ttdeci">md_context_t md_ctx</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00080">hmac_drbg.h:80</a></div></div>
<div class="ttc" id="structhmac__drbg__context_html_a1bcf4e63608464d20a75486f6a8d2eba"><div class="ttname"><a href="structhmac__drbg__context.html#a1bcf4e63608464d20a75486f6a8d2eba">hmac_drbg_context::reseed_counter</a></div><div class="ttdeci">int reseed_counter</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00082">hmac_drbg.h:82</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_acd163a15df844543ab5b950f4d13d65f"><div class="ttname"><a href="hmac__drbg_8h.html#acd163a15df844543ab5b950f4d13d65f">hmac_drbg_init_buf</a></div><div class="ttdeci">int hmac_drbg_init_buf(hmac_drbg_context *ctx, const md_info_t *md_info, const unsigned char *data, size_t data_len)</div><div class="ttdoc">Initilisation of simpified HMAC_DRBG (never reseeds). </div></div>
<div class="ttc" id="structhmac__drbg__context_html_abe5a16c6fabcb6783df5d1b3065d9c77"><div class="ttname"><a href="structhmac__drbg__context.html#abe5a16c6fabcb6783df5d1b3065d9c77">hmac_drbg_context::prediction_resistance</a></div><div class="ttdeci">int prediction_resistance</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00086">hmac_drbg.h:86</a></div></div>
<div class="ttc" id="structhmac__drbg__context_html_a43d2193b71699be512441df40b876008"><div class="ttname"><a href="structhmac__drbg__context.html#a43d2193b71699be512441df40b876008">hmac_drbg_context::reseed_interval</a></div><div class="ttdeci">int reseed_interval</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00088">hmac_drbg.h:88</a></div></div>
<div class="ttc" id="structmd__info__t_html_aedb1e12797791c9b7f5545bda6e3172d"><div class="ttname"><a href="structmd__info__t.html#aedb1e12797791c9b7f5545bda6e3172d">md_info_t::size</a></div><div class="ttdeci">int size</div><div class="ttdoc">Output length of the digest function. </div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00082">md.h:82</a></div></div>
<div class="ttc" id="hmac__drbg_8h_html_aea5f53d8763e30ec7ecf053a119f4a23"><div class="ttname"><a href="hmac__drbg_8h.html#aea5f53d8763e30ec7ecf053a119f4a23">hmac_drbg_update</a></div><div class="ttdeci">void hmac_drbg_update(hmac_drbg_context *ctx, const unsigned char *additional, size_t add_len)</div><div class="ttdoc">HMAC_DRBG update state. </div></div>
<div class="ttc" id="md_8h_html_af1fbbb67afa0daee4090cde8864e0b68a3d59000e02cfa0867e14002d95046335"><div class="ttname"><a href="md_8h.html#af1fbbb67afa0daee4090cde8864e0b68a3d59000e02cfa0867e14002d95046335">POLARSSL_MD_SHA1</a></div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00056">md.h:56</a></div></div>
<div class="ttc" id="structhmac__drbg__context_html_a599a085156c46b5b793837b7d7fb9b4d"><div class="ttname"><a href="structhmac__drbg__context.html#a599a085156c46b5b793837b7d7fb9b4d">hmac_drbg_context::entropy_len</a></div><div class="ttdeci">size_t entropy_len</div><div class="ttdef"><b>Definition:</b> <a href="hmac__drbg_8h_source.html#l00085">hmac_drbg.h:85</a></div></div>
<div class="ttc" id="md_8h_html_a3312061daf9ecc722c025cdbee9c38cc"><div class="ttname"><a href="md_8h.html#a3312061daf9ecc722c025cdbee9c38cc">md_free_ctx</a></div><div class="ttdeci">int md_free_ctx(md_context_t *ctx)</div><div class="ttdoc">Free the message-specific context of ctx. </div></div>
<div class="ttc" id="structmd__info__t_html"><div class="ttname"><a href="structmd__info__t.html">md_info_t</a></div><div class="ttdoc">Message digest information. </div><div class="ttdef"><b>Definition:</b> <a href="md_8h_source.html#l00074">md.h:74</a></div></div>
<div class="ttc" id="md_8h_html_ae4d71986a47097a6c320965c9656c81e"><div class="ttname"><a href="md_8h.html#ae4d71986a47097a6c320965c9656c81e">md_hmac_finish</a></div><div class="ttdeci">int md_hmac_finish(md_context_t *ctx, unsigned char *output)</div><div class="ttdoc">Generic HMAC final digest. </div></div>
<div class="ttc" id="hmac__drbg_8h_html"><div class="ttname"><a href="hmac__drbg_8h.html">hmac_drbg.h</a></div><div class="ttdoc">HMAC_DRBG (NIST SP 800-90A) </div></div>
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