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<div id="projectname">Crypto++
 <span id="projectnumber">7.0</span>
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<div id="projectbrief">Free C++ class library of cryptographic schemes</div>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">RandomPool Class Reference</div> </div>
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<p>Randomness Pool based on AES-256.
<a href="class_random_pool.html#details">More...</a></p>
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<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Inheritance diagram for RandomPool:</div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a1197329c8cf4ffd9097a2675431c0da1"><td class="memItemLeft" align="right" valign="top"><a id="a1197329c8cf4ffd9097a2675431c0da1"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_pool.html#a1197329c8cf4ffd9097a2675431c0da1">RandomPool</a> ()</td></tr>
<tr class="memdesc:a1197329c8cf4ffd9097a2675431c0da1"><td class="mdescLeft"> </td><td class="mdescRight">Construct a <a class="el" href="class_random_pool.html" title="Randomness Pool based on AES-256. ">RandomPool</a>. <br /></td></tr>
<tr class="separator:a1197329c8cf4ffd9097a2675431c0da1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a13cd8575fe2840c8a71f6a6b6439c9df"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_pool.html#a13cd8575fe2840c8a71f6a6b6439c9df">CanIncorporateEntropy</a> () const</td></tr>
<tr class="memdesc:a13cd8575fe2840c8a71f6a6b6439c9df"><td class="mdescLeft"> </td><td class="mdescRight">Determines if a generator can accept additional entropy. <a href="#a13cd8575fe2840c8a71f6a6b6439c9df">More...</a><br /></td></tr>
<tr class="separator:a13cd8575fe2840c8a71f6a6b6439c9df"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4339d77cb309a5ee47d7a5f1751481f3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_pool.html#a4339d77cb309a5ee47d7a5f1751481f3">IncorporateEntropy</a> (const byte *input, size_t length)</td></tr>
<tr class="memdesc:a4339d77cb309a5ee47d7a5f1751481f3"><td class="mdescLeft"> </td><td class="mdescRight">Update RNG state with additional unpredictable values. <a href="#a4339d77cb309a5ee47d7a5f1751481f3">More...</a><br /></td></tr>
<tr class="separator:a4339d77cb309a5ee47d7a5f1751481f3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa8f69e71e3f43bc78b73084b81567a7e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_pool.html#aa8f69e71e3f43bc78b73084b81567a7e">GenerateIntoBufferedTransformation</a> (<a class="el" href="class_buffered_transformation.html">BufferedTransformation</a> &target, const std::string &channel, lword size)</td></tr>
<tr class="memdesc:aa8f69e71e3f43bc78b73084b81567a7e"><td class="mdescLeft"> </td><td class="mdescRight">Generate random bytes into a <a class="el" href="class_buffered_transformation.html" title="Interface for buffered transformations. ">BufferedTransformation</a>. <a href="#aa8f69e71e3f43bc78b73084b81567a7e">More...</a><br /></td></tr>
<tr class="separator:aa8f69e71e3f43bc78b73084b81567a7e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_random_number_generator"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_random_number_generator')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_random_number_generator.html">RandomNumberGenerator</a></td></tr>
<tr class="memitem:ada0f7c437b0c8e6ba94ebcd75bff4bda inherit pub_methods_class_random_number_generator"><td class="memItemLeft" align="right" valign="top">virtual byte </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">GenerateByte</a> ()</td></tr>
<tr class="memdesc:ada0f7c437b0c8e6ba94ebcd75bff4bda inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Generate new random byte and return it. <a href="class_random_number_generator.html#ada0f7c437b0c8e6ba94ebcd75bff4bda">More...</a><br /></td></tr>
<tr class="separator:ada0f7c437b0c8e6ba94ebcd75bff4bda inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ace592244cfbd6c18398ea6c75857532e inherit pub_methods_class_random_number_generator"><td class="memItemLeft" align="right" valign="top">virtual unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#ace592244cfbd6c18398ea6c75857532e">GenerateBit</a> ()</td></tr>
<tr class="memdesc:ace592244cfbd6c18398ea6c75857532e inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Generate new random bit and return it. <a href="class_random_number_generator.html#ace592244cfbd6c18398ea6c75857532e">More...</a><br /></td></tr>
<tr class="separator:ace592244cfbd6c18398ea6c75857532e inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a96a3eec202b6251f5c94136ab7edbde1 inherit pub_methods_class_random_number_generator"><td class="memItemLeft" align="right" valign="top">virtual word32 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#a96a3eec202b6251f5c94136ab7edbde1">GenerateWord32</a> (word32 min=0, word32 max=0xffffffffUL)</td></tr>
<tr class="memdesc:a96a3eec202b6251f5c94136ab7edbde1 inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Generate a random 32 bit word in the range min to max, inclusive. <a href="class_random_number_generator.html#a96a3eec202b6251f5c94136ab7edbde1">More...</a><br /></td></tr>
<tr class="separator:a96a3eec202b6251f5c94136ab7edbde1 inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a497145546d24e6d4abaf10b7e0f1ba17 inherit pub_methods_class_random_number_generator"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17">GenerateBlock</a> (byte *output, size_t size)</td></tr>
<tr class="memdesc:a497145546d24e6d4abaf10b7e0f1ba17 inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Generate random array of bytes. <a href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17">More...</a><br /></td></tr>
<tr class="separator:a497145546d24e6d4abaf10b7e0f1ba17 inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a44f70ad8fed869a4ee55f50ef8e6e699 inherit pub_methods_class_random_number_generator"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#a44f70ad8fed869a4ee55f50ef8e6e699">DiscardBytes</a> (size_t n)</td></tr>
<tr class="memdesc:a44f70ad8fed869a4ee55f50ef8e6e699 inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Generate and discard n bytes. <a href="class_random_number_generator.html#a44f70ad8fed869a4ee55f50ef8e6e699">More...</a><br /></td></tr>
<tr class="separator:a44f70ad8fed869a4ee55f50ef8e6e699 inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aff937f93b0b1e17e7905494ef060fce2 inherit pub_methods_class_random_number_generator"><td class="memTemplParams" colspan="2">template<class IT > </td></tr>
<tr class="memitem:aff937f93b0b1e17e7905494ef060fce2 inherit pub_methods_class_random_number_generator"><td class="memTemplItemLeft" align="right" valign="top">void </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="class_random_number_generator.html#aff937f93b0b1e17e7905494ef060fce2">Shuffle</a> (IT begin, IT end)</td></tr>
<tr class="memdesc:aff937f93b0b1e17e7905494ef060fce2 inherit pub_methods_class_random_number_generator"><td class="mdescLeft"> </td><td class="mdescRight">Randomly shuffle the specified array. <a href="class_random_number_generator.html#aff937f93b0b1e17e7905494ef060fce2">More...</a><br /></td></tr>
<tr class="separator:aff937f93b0b1e17e7905494ef060fce2 inherit pub_methods_class_random_number_generator"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_algorithm"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_algorithm')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_algorithm.html">Algorithm</a></td></tr>
<tr class="memitem:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#a1c77f5117ca2cd881baf26a364cfc606">Algorithm</a> (bool checkSelfTestStatus=true)</td></tr>
<tr class="memdesc:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Interface for all crypto algorithms. <a href="class_algorithm.html#a1c77f5117ca2cd881baf26a364cfc606">More...</a><br /></td></tr>
<tr class="separator:a1c77f5117ca2cd881baf26a364cfc606 inherit pub_methods_class_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="memItemLeft" align="right" valign="top">virtual std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="class_algorithm.html#a4f31510a192d1121856efe8ad0a9b844">AlgorithmName</a> () const</td></tr>
<tr class="memdesc:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="mdescLeft"> </td><td class="mdescRight">Provides the name of this algorithm. <a href="class_algorithm.html#a4f31510a192d1121856efe8ad0a9b844">More...</a><br /></td></tr>
<tr class="separator:a4f31510a192d1121856efe8ad0a9b844 inherit pub_methods_class_algorithm"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="inherit_header pub_methods_class_clonable"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_class_clonable')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="class_clonable.html">Clonable</a></td></tr>
<tr class="memitem:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="class_clonable.html">Clonable</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_clonable.html#ad0016ba2d505c23aa85aad49e6c19bb7">Clone</a> () const</td></tr>
<tr class="memdesc:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="mdescLeft"> </td><td class="mdescRight">Copies this object. <a href="class_clonable.html#ad0016ba2d505c23aa85aad49e6c19bb7">More...</a><br /></td></tr>
<tr class="separator:ad0016ba2d505c23aa85aad49e6c19bb7 inherit pub_methods_class_clonable"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Randomness Pool based on AES-256. </p>
<p><a class="el" href="class_random_pool.html" title="Randomness Pool based on AES-256. ">RandomPool</a> can be used to generate cryptographic quality pseudorandom bytes after seeding the pool with <a class="el" href="class_random_pool.html#a4339d77cb309a5ee47d7a5f1751481f3" title="Update RNG state with additional unpredictable values. ">IncorporateEntropy()</a>. Internally, the generator uses AES-256 to produce the stream. Entropy is stirred in using SHA-256.</p>
<p><a class="el" href="class_random_pool.html" title="Randomness Pool based on AES-256. ">RandomPool</a> used to follow the design of randpool in PGP 2.6.x. At version 5.5 <a class="el" href="class_random_pool.html" title="Randomness Pool based on AES-256. ">RandomPool</a> was redesigned to reduce the risk of reusing random numbers after state rollback, which may occur when running in a virtual machine like VMware or a hosted environment.</p>
<p>If you need the pre-Crypto++ 5.5 generator then use <a class="el" href="class_old_random_pool.html" title="Randomness Pool based on PGP 2.6.x with MDC. ">OldRandomPool</a> class. You should migrate away from <a class="el" href="class_old_random_pool.html" title="Randomness Pool based on PGP 2.6.x with MDC. ">OldRandomPool</a> at the earliest opportunity. </p><dl class="section see"><dt>See also</dt><dd><a class="el" href="class_old_random_pool.html" title="Randomness Pool based on PGP 2.6.x with MDC. ">OldRandomPool</a> </dd></dl>
<dl class="section since"><dt>Since</dt><dd>Crypto++ 4.0 (PGP 2.6.x style), Crypto++ 5.5 (AES-256 based) </dd></dl>
<p class="definition">Definition at line <a class="el" href="randpool_8h_source.html#l00041">41</a> of file <a class="el" href="randpool_8h_source.html">randpool.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a13cd8575fe2840c8a71f6a6b6439c9df"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a13cd8575fe2840c8a71f6a6b6439c9df">◆ </a></span>CanIncorporateEntropy()</h2>
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<td class="memname">bool RandomPool::CanIncorporateEntropy </td>
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<td class="paramname"></td><td>)</td>
<td> const</td>
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<p>Determines if a generator can accept additional entropy. </p>
<dl class="section return"><dt>Returns</dt><dd>true if <a class="el" href="class_random_pool.html#a4339d77cb309a5ee47d7a5f1751481f3" title="Update RNG state with additional unpredictable values. ">IncorporateEntropy()</a> is implemented </dd></dl>
<p>Reimplemented from <a class="el" href="class_random_number_generator.html#a859bf69f7fae074201745eadf765ae44">RandomNumberGenerator</a>.</p>
<p class="definition">Definition at line <a class="el" href="randpool_8h_source.html#l00047">47</a> of file <a class="el" href="randpool_8h_source.html">randpool.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a4339d77cb309a5ee47d7a5f1751481f3">◆ </a></span>IncorporateEntropy()</h2>
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<td class="memname">void RandomPool::IncorporateEntropy </td>
<td>(</td>
<td class="paramtype">const byte * </td>
<td class="paramname"><em>input</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">size_t </td>
<td class="paramname"><em>length</em> </td>
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<p>Update RNG state with additional unpredictable values. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">input</td><td>the entropy to add to the generator </td></tr>
<tr><td class="paramname">length</td><td>the size of the input buffer </td></tr>
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</dd>
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<dl class="exception"><dt>Exceptions</dt><dd>
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<tr><td class="paramname"><a class="el" href="class_not_implemented.html" title="A method was called which was not implemented. ">NotImplemented</a></td><td></td></tr>
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<p>A generator may or may not accept additional entropy. Call <a class="el" href="class_random_pool.html#a13cd8575fe2840c8a71f6a6b6439c9df" title="Determines if a generator can accept additional entropy. ">CanIncorporateEntropy()</a> to test for the ability to use additional entropy.</p>
<p>If a derived class does not override <a class="el" href="class_random_pool.html#a4339d77cb309a5ee47d7a5f1751481f3" title="Update RNG state with additional unpredictable values. ">IncorporateEntropy()</a>, then the base class throws <a class="el" href="class_not_implemented.html" title="A method was called which was not implemented. ">NotImplemented</a>. </p>
<p>Reimplemented from <a class="el" href="class_random_number_generator.html#a6feb4f0afedb62a495b7a9ae311fa1cb">RandomNumberGenerator</a>.</p>
<p class="definition">Definition at line <a class="el" href="randpool_8cpp_source.html#l00032">32</a> of file <a class="el" href="randpool_8cpp_source.html">randpool.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8f69e71e3f43bc78b73084b81567a7e">◆ </a></span>GenerateIntoBufferedTransformation()</h2>
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<td class="memname">void RandomPool::GenerateIntoBufferedTransformation </td>
<td>(</td>
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<td class="paramtype">const std::string & </td>
<td class="paramname"><em>channel</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">lword </td>
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<p>Generate random bytes into a <a class="el" href="class_buffered_transformation.html" title="Interface for buffered transformations. ">BufferedTransformation</a>. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">target</td><td>the <a class="el" href="class_buffered_transformation.html" title="Interface for buffered transformations. ">BufferedTransformation</a> object which receives the bytes </td></tr>
<tr><td class="paramname">channel</td><td>the channel on which the bytes should be pumped </td></tr>
<tr><td class="paramname">length</td><td>the number of bytes to generate</td></tr>
</table>
</dd>
</dl>
<p>The default implementation calls <a class="el" href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17" title="Generate random array of bytes. ">GenerateBlock()</a> and pumps the result into the DEFAULT_CHANNEL of the target.</p>
<p>All generated values are uniformly distributed over the range specified within the the constraints of a particular generator. </p><dl class="section note"><dt>Note</dt><dd>A derived generator <em>must</em> override either <a class="el" href="class_random_number_generator.html#a497145546d24e6d4abaf10b7e0f1ba17" title="Generate random array of bytes. ">GenerateBlock()</a> or <a class="el" href="class_random_pool.html#aa8f69e71e3f43bc78b73084b81567a7e" title="Generate random bytes into a BufferedTransformation. ">GenerateIntoBufferedTransformation()</a>. They can override both, or have one call the other. </dd></dl>
<p>Reimplemented from <a class="el" href="class_random_number_generator.html#a5cc474006e2c7383ec20cc4d0c2abbaf">RandomNumberGenerator</a>.</p>
<p class="definition">Definition at line <a class="el" href="randpool_8cpp_source.html#l00041">41</a> of file <a class="el" href="randpool_8cpp_source.html">randpool.cpp</a>.</p>
</div>
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<hr/>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="randpool_8h_source.html">randpool.h</a></li>
<li><a class="el" href="randpool_8cpp_source.html">randpool.cpp</a></li>
</ul>
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