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<li class="navelem"><a class="el" href="dir_90ffdbabf412cfdffe6b2193e0ce938a.html">libxrpl</a></li><li class="navelem"><a class="el" href="dir_f4d4bb7543dc651bdc62871bbbb694fa.html">crypto</a></li> </ul>
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<div class="headertitle"><div class="title">libxrpl/crypto/csprng.cpp</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="preprocessor">#include &lt;xrpl/basics/contract.h&gt;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="preprocessor">#include &lt;xrpl/crypto/csprng.h&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="preprocessor">#include &lt;openssl/rand.h&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="preprocessor">#include &lt;openssl/ssl.h&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/array.html">array</a>&gt;</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/cstddef.html">cstddef</a>&gt;</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/mutex.html">mutex</a>&gt;</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/random.html">random</a>&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="preprocessor">#include &lt;<a class="codeRef" href="http://en.cppreference.com/w/cpp/header/stdexcept.html">stdexcept</a>&gt;</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span> </div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceripple.html">ripple</a> {</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span> </div>
<div class="foldopen" id="foldopen00015" data-start="{" data-end="}">
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#accace645f13187f316df3fa6fc2fa42f"> 15</a></span><a class="code hl_function" href="classripple_1_1csprng__engine.html#accace645f13187f316df3fa6fc2fa42f">csprng_engine::csprng_engine</a>()</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span>{</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// This is not strictly necessary</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <span class="keywordflow">if</span> (RAND_poll() != 1)</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span> Throw&lt;std::runtime_error&gt;(<span class="stringliteral">&quot;CSPRNG: Initial polling failed&quot;</span>);</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span>}</div>
</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
<div class="foldopen" id="foldopen00022" data-start="{" data-end="}">
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a3386463bc8eab7446790a07c8c987682"> 22</a></span><a class="code hl_function" href="classripple_1_1csprng__engine.html#a3386463bc8eab7446790a07c8c987682">csprng_engine::~csprng_engine</a>()</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span>{</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span> <span class="comment">// This cleanup function is not needed in newer versions of OpenSSL</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="preprocessor">#if (OPENSSL_VERSION_NUMBER &lt; 0x10100000L)</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> RAND_cleanup();</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span>}</div>
</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00031" data-start="{" data-end="}">
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#adcde93c17e1dc87ad4e382c971022a44"> 31</a></span><a class="code hl_function" href="classripple_1_1csprng__engine.html#adcde93c17e1dc87ad4e382c971022a44">csprng_engine::mix_entropy</a>(<span class="keywordtype">void</span>* buffer, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> count)</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span>{</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/container/array.html">std::array&lt;std::random_device::result_type, 128&gt;</a> entropy;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> {</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// On every platform we support, std::random_device</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// is non-deterministic and should provide some good</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// quality entropy.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/numeric/random/random_device.html">std::random_device</a> rd;</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordflow">for</span> (<span class="keyword">auto</span>&amp; e : entropy)</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> e = rd();</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> }</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> lock(<a class="code hl_variable" href="classripple_1_1csprng__engine.html#a97b1006643b8f6035436b268ec9925bd">mutex_</a>);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// We add data to the pool, but we conservatively assume that</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// it contributes no actual entropy.</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> RAND_add(</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> entropy.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/data.html">data</a>(),</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> entropy.<a class="code hl_functionRef" href="http://en.cppreference.com/w/cpp/container/array/size.html">size</a>() * <span class="keyword">sizeof</span>(std::random_device::result_type),</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> 0);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> <span class="keywordflow">if</span> (buffer != <span class="keyword">nullptr</span> &amp;&amp; count != 0)</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> RAND_add(buffer, count, 0);</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span>}</div>
</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="keywordtype">void</span></div>
<div class="foldopen" id="foldopen00059" data-start="{" data-end="}">
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a819784fcb003e1aa6cae38411c259a7f"> 59</a></span><a class="code hl_function" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1">csprng_engine::operator()</a>(<span class="keywordtype">void</span>* ptr, <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a> count)</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span>{</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// RAND_bytes is thread-safe on OpenSSL 1.1.0 and later when compiled</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// with thread support, so we don&#39;t need to grab a mutex.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// https://mta.openssl.org/pipermail/openssl-users/2020-November/013146.html</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="preprocessor">#if (OPENSSL_VERSION_NUMBER &lt; 0x10100000L) || !defined(OPENSSL_THREADS)</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a> lock(<a class="code hl_variable" href="classripple_1_1csprng__engine.html#a97b1006643b8f6035436b268ec9925bd">mutex_</a>);</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">auto</span> <span class="keyword">const</span> result =</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> RAND_bytes(<span class="keyword">reinterpret_cast&lt;</span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*<span class="keyword">&gt;</span>(ptr), count);</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> </div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keywordflow">if</span> (result != 1)</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> Throw&lt;std::runtime_error&gt;(<span class="stringliteral">&quot;CSPRNG: Insufficient entropy&quot;</span>);</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>}</div>
</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">csprng_engine::result_type</a></div>
<div class="foldopen" id="foldopen00076" data-start="{" data-end="}">
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1"> 76</a></span><a class="code hl_function" href="classripple_1_1csprng__engine.html#a6b969b83bee1e62da4460739d6af07d1">csprng_engine::operator()</a>()</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span>{</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <a class="code hl_classRef" href="http://en.cppreference.com/w/cpp/types/integer.html">result_type</a> ret;</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> (*this)(&amp;ret, <span class="keyword">sizeof</span>(<a class="code hl_typedef" href="classripple_1_1csprng__engine.html#a1d06454904c264b7a0cce18101762af3">result_type</a>));</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keywordflow">return</span> ret;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span>}</div>
</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><a class="code hl_class" href="classripple_1_1csprng__engine.html">csprng_engine</a>&amp;</div>
<div class="foldopen" id="foldopen00084" data-start="{" data-end="}">
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"><a class="line" href="namespaceripple.html#a64faabbdff83da8b7fd7aaafbb937867"> 84</a></span><a class="code hl_function" href="namespaceripple.html#a64faabbdff83da8b7fd7aaafbb937867">crypto_prng</a>()</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span>{</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">static</span> <a class="code hl_class" href="classripple_1_1csprng__engine.html">csprng_engine</a> engine;</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">return</span> engine;</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span>}</div>
</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span>} <span class="comment">// namespace ripple</span></div>
<div class="ttc" id="aarray_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/array.html">array</a></div></div>
<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#l00016">csprng.h:17</a></div></div>
<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#l00022">csprng.h:22</a></div></div>
<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="libxrpl_2crypto_2csprng_8cpp_source.html#l00022">libxrpl/crypto/csprng.cpp:22</a></div></div>
<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="libxrpl_2crypto_2csprng_8cpp_source.html#l00076">libxrpl/crypto/csprng.cpp:76</a></div></div>
<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#l00019">csprng.h:19</a></div></div>
<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="libxrpl_2crypto_2csprng_8cpp_source.html#l00015">libxrpl/crypto/csprng.cpp:15</a></div></div>
<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="libxrpl_2crypto_2csprng_8cpp_source.html#l00031">libxrpl/crypto/csprng.cpp:31</a></div></div>
<div class="ttc" id="acstddef_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/cstddef.html">cstddef</a></div></div>
<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>
<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>
<div class="ttc" id="alock_guard_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/thread/lock_guard.html">std::lock_guard</a></div></div>
<div class="ttc" id="amutex_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/mutex.html">mutex</a></div></div>
<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="algorithm_8h_source.html#l00006">algorithm.h:6</a></div></div>
<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 &amp; crypto_prng()</div><div class="ttdoc">The default cryptographically secure PRNG.</div><div class="ttdef"><b>Definition</b> <a href="libxrpl_2crypto_2csprng_8cpp_source.html#l00084">libxrpl/crypto/csprng.cpp:84</a></div></div>
<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>
<div class="ttc" id="arandom_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/random.html">random</a></div></div>
<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>
<div class="ttc" id="asize_t_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/types/size_t.html">std::size_t</a></div></div>
<div class="ttc" id="astdexcept_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/header/stdexcept.html">stdexcept</a></div></div>
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