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<li class="navelem"><a class="el" href="dir_df9c78dcf3f59a33b12284f95992a64b.html">ripple</a></li><li class="navelem"><a class="el" href="dir_d5da7ddd3d406e00ccd5e9ec8a805734.html">crypto</a></li><li class="navelem"><a class="el" href="dir_e0372dc464190647d9bdbe8304e20257.html">impl</a></li> </ul>
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<div class="title">csprng.cpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">//------------------------------------------------------------------------------</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> This file is part of rippled: https://github.com/ripple/rippled</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (c) 2012, 2013 Ripple Labs Inc.</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> purpose with or without fee is hereby granted, provided that the above</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> copyright notice and this permission notice appear in all copies.</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">*/</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">//==============================================================================</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include <ripple/basics/contract.h></span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include <ripple/crypto/csprng.h></span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/array.html">array</a>></span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cassert.html">cassert</a>></span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include <openssl/rand.h></span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/random.html">random</a>></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include <<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/stdexcept.html">stdexcept</a>></span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="keyword">namespace </span><a class="code" href="namespaceripple.html">ripple</a> {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
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<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#accace645f13187f316df3fa6fc2fa42f"> 30</a></span> <a class="code" href="classripple_1_1csprng__engine.html#accace645f13187f316df3fa6fc2fa42f">csprng_engine::csprng_engine</a>()</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="comment">// This is not strictly necessary</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">if</span> (RAND_poll() != 1)</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  Throw<std::runtime_error>(<span class="stringliteral">"CSPRNG: Initial polling failed"</span>);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> }</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
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<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a3386463bc8eab7446790a07c8c987682"> 37</a></span> <a class="code" href="classripple_1_1csprng__engine.html#a3386463bc8eab7446790a07c8c987682">csprng_engine::~csprng_engine</a>()</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// This cleanup function is not needed in newer versions of OpenSSL</span></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#if (OPENSSL_VERSION_NUMBER < 0x10100000L)</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  RAND_cleanup();</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> }</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#adcde93c17e1dc87ad4e382c971022a44"> 46</a></span> <a class="code" href="classripple_1_1csprng__engine.html#adcde93c17e1dc87ad4e382c971022a44">csprng_engine::mix_entropy</a>(<span class="keywordtype">void</span>* buffer, <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> count)</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> {</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array<std::random_device::result_type, 128></a> entropy;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// On every platform we support, std::random_device</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// is non-deterministic and should provide some good</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// quality entropy.</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/numeric/random/random_device.html">std::random_device</a> rd;</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span>& e : entropy)</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  e = rd();</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> lock(<a class="code" href="classripple_1_1csprng__engine.html#a97b1006643b8f6035436b268ec9925bd">mutex_</a>);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// We add data to the pool, but we conservatively assume that</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// it contributes no actual entropy.</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  RAND_add(</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  entropy.<a class="codeRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(),</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  entropy.<a class="codeRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>() * <span class="keyword">sizeof</span>(std::random_device::result_type),</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  0);</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (buffer != <span class="keyword">nullptr</span> && count != 0)</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  RAND_add(buffer, count, 0);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  </div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keywordtype">void</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a819784fcb003e1aa6cae38411c259a7f"> 74</a></span> <a class="code" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1">csprng_engine::operator()</a>(<span class="keywordtype">void</span>* ptr, <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> count)</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> {</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// RAND_bytes is thread-safe on OpenSSL 1.1.0 and later when compiled</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// with thread support, so we don't need to grab a mutex.</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// https://mta.openssl.org/pipermail/openssl-users/2020-November/013146.html</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || !defined(OPENSSL_THREADS)</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> lock(<a class="code" href="classripple_1_1csprng__engine.html#a97b1006643b8f6035436b268ec9925bd">mutex_</a>);</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">auto</span> <span class="keyword">const</span> result =</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  RAND_bytes(<span class="keyword">reinterpret_cast<</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*<span class="keyword">></span>(ptr), count);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (result != 1)</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  Throw<std::runtime_error>(<span class="stringliteral">"CSPRNG: Insufficient entropy"</span>);</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/integer.html">csprng_engine::result_type</a></div>
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<div class="line"><a name="l00091"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1"> 91</a></span> <a class="code" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1">csprng_engine::operator()</a>()</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> {</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <a class="codeRef" href="http://en.cppreference.com/w/cpp/types/integer.html">result_type</a> ret;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  (*this)(&ret, <span class="keyword">sizeof</span>(<a class="code" href="classripple_1_1csprng__engine.html#a1d06454904c264b7a0cce18101762af3">result_type</a>));</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">return</span> ret;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> }</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <a class="code" href="classripple_1_1csprng__engine.html">csprng_engine</a>&</div>
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<div class="line"><a name="l00099"></a><span class="lineno"><a class="line" href="namespaceripple.html#a64faabbdff83da8b7fd7aaafbb937867"> 99</a></span> <a class="code" href="namespaceripple.html#a64faabbdff83da8b7fd7aaafbb937867">crypto_prng</a>()</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">static</span> <a class="code" href="classripple_1_1csprng__engine.html">csprng_engine</a> engine;</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> engine;</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> }</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> } <span class="comment">// namespace ripple</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_a3386463bc8eab7446790a07c8c987682"><div class="ttname"><a href="classripple_1_1csprng__engine.html#a3386463bc8eab7446790a07c8c987682">ripple::csprng_engine::~csprng_engine</a></div><div class="ttdeci">~csprng_engine()</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8cpp_source.html#l00037">csprng.cpp:37</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_adcde93c17e1dc87ad4e382c971022a44"><div class="ttname"><a href="classripple_1_1csprng__engine.html#adcde93c17e1dc87ad4e382c971022a44">ripple::csprng_engine::mix_entropy</a></div><div class="ttdeci">void mix_entropy(void *buffer=nullptr, std::size_t count=0)</div><div class="ttdoc">Mix entropy into the pool.</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8cpp_source.html#l00046">csprng.cpp:46</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_a97b1006643b8f6035436b268ec9925bd"><div class="ttname"><a href="classripple_1_1csprng__engine.html#a97b1006643b8f6035436b268ec9925bd">ripple::csprng_engine::mutex_</a></div><div class="ttdeci">std::mutex mutex_</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8h_source.html#l00040">csprng.h:40</a></div></div>
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<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/array/size.html">std::array::size</a></div><div class="ttdeci">T size(T... args)</div></div>
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<div class="ttc" id="anamespaceripple_html_a64faabbdff83da8b7fd7aaafbb937867"><div class="ttname"><a href="namespaceripple.html#a64faabbdff83da8b7fd7aaafbb937867">ripple::crypto_prng</a></div><div class="ttdeci">csprng_engine & crypto_prng()</div><div class="ttdoc">The default cryptographically secure PRNG.</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8cpp_source.html#l00099">csprng.cpp:99</a></div></div>
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<div class="ttc" id="arandom_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/random.html">random</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_a1d06454904c264b7a0cce18101762af3"><div class="ttname"><a href="classripple_1_1csprng__engine.html#a1d06454904c264b7a0cce18101762af3">ripple::csprng_engine::result_type</a></div><div class="ttdeci">std::uint64_t result_type</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8h_source.html#l00043">csprng.h:43</a></div></div>
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<div class="ttc" id="arandom_device_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/numeric/random/random_device.html">std::random_device</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_a6b969b83bee1e62da4460739d6af07d1"><div class="ttname"><a href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1">ripple::csprng_engine::operator()</a></div><div class="ttdeci">result_type operator()()</div><div class="ttdoc">Generate a random integer.</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8cpp_source.html#l00091">csprng.cpp:91</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html_accace645f13187f316df3fa6fc2fa42f"><div class="ttname"><a href="classripple_1_1csprng__engine.html#accace645f13187f316df3fa6fc2fa42f">ripple::csprng_engine::csprng_engine</a></div><div class="ttdeci">csprng_engine()</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8cpp_source.html#l00030">csprng.cpp:30</a></div></div>
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<div class="ttc" id="aarray_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/array.html">array</a></div></div>
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<div class="ttc" id="aclassripple_1_1csprng__engine_html"><div class="ttname"><a href="classripple_1_1csprng__engine.html">ripple::csprng_engine</a></div><div class="ttdoc">A cryptographically secure random number engine.</div><div class="ttdef"><b>Definition:</b> <a href="csprng_8h_source.html#l00037">csprng.h:37</a></div></div>
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<div class="ttc" id="ainteger_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a></div></div>
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<div class="ttc" id="anamespaceripple_html"><div class="ttname"><a href="namespaceripple.html">ripple</a></div><div class="ttdoc">Use hash_* containers for keys that do not need a cryptographically secure hashing algorithm.</div><div class="ttdef"><b>Definition:</b> <a href="RCLCensorshipDetector_8h_source.html#l00029">RCLCensorshipDetector.h:29</a></div></div>
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<div class="ttc" id="acassert_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/cassert.html">cassert</a></div></div>
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<div class="ttc" id="adata_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/array/data.html">std::array::data</a></div><div class="ttdeci">T data(T... args)</div></div>
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