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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="#nested-classes">Classes</a> |
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<div class="title">osrng.h File Reference</div> </div>
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<p>Classes for access to the operating system's random number generators.
<a href="#details">More...</a></p>
<p><a href="osrng_8h_source.html">Go to the source code of this file.</a></p>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_exception.html" title="Base class for all exceptions thrown by the library. ">Exception</a> thrown when an operating system error is encountered. <a href="class_o_s___r_n_g___err.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_microsoft_crypto_provider.html">MicrosoftCryptoProvider</a></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_nonblocking_rng.html">NonblockingRng</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Wrapper class for /dev/random and /dev/srandom. <a href="class_nonblocking_rng.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_blocking_rng.html">BlockingRng</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Wrapper class for /dev/random and /dev/srandom. <a href="class_blocking_rng.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_auto_seeded_random_pool.html">AutoSeededRandomPool</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Automatically Seeded Randomness Pool. <a href="class_auto_seeded_random_pool.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_auto_seeded_x917_r_n_g.html">AutoSeededX917RNG< BLOCK_CIPHER ></a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Automatically Seeded X9.17 RNG. <a href="class_auto_seeded_x917_r_n_g.html#details">More...</a><br /></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_default_auto_seeded_r_n_g.html">DefaultAutoSeededRNG</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">A typedef providing a default generator. <a href="class_default_auto_seeded_r_n_g.html#details">More...</a><br /></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:a8469ca3f35c72e1b80f61432f7739b91"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="osrng_8h.html#a8469ca3f35c72e1b80f61432f7739b91">OS_GenerateRandomBlock</a> (bool blocking, byte *output, size_t size)</td></tr>
<tr class="memdesc:a8469ca3f35c72e1b80f61432f7739b91"><td class="mdescLeft"> </td><td class="mdescRight">OS_GenerateRandomBlock. <a href="#a8469ca3f35c72e1b80f61432f7739b91">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Classes for access to the operating system's random number generators. </p>
<p class="definition">Definition in file <a class="el" href="osrng_8h_source.html">osrng.h</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a8469ca3f35c72e1b80f61432f7739b91">◆ </a></span>OS_GenerateRandomBlock()</h2>
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<td class="memname">void OS_GenerateRandomBlock </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>blocking</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">byte * </td>
<td class="paramname"><em>output</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>size</em> </td>
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<td>)</td>
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<p>OS_GenerateRandomBlock. </p>
<p>Generate random array of bytes </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">blocking</td><td>specifies whther a bobcking or non-blocking generator should be used </td></tr>
<tr><td class="paramname">output</td><td>the byte buffer </td></tr>
<tr><td class="paramname">size</td><td>the length of the buffer, in bytes</td></tr>
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</dd>
</dl>
<p><a class="el" href="osrng_8h.html#a8469ca3f35c72e1b80f61432f7739b91" title="OS_GenerateRandomBlock. ">OS_GenerateRandomBlock()</a> uses the underlying operating system's random number generator. On Windows, CryptGenRandom() is called using <a class="el" href="class_nonblocking_rng.html" title="Wrapper class for /dev/random and /dev/srandom. ">NonblockingRng</a>.</p>
<p>On Unix and compatibles, /dev/urandom is called if blocking is false using <a class="el" href="class_nonblocking_rng.html" title="Wrapper class for /dev/random and /dev/srandom. ">NonblockingRng</a>. If blocking is true, then either /dev/randomd or /dev/srandom is used by way of <a class="el" href="class_blocking_rng.html" title="Wrapper class for /dev/random and /dev/srandom. ">BlockingRng</a>, if available. </p>
<p class="definition">Definition at line <a class="el" href="osrng_8cpp_source.html#l00234">234</a> of file <a class="el" href="osrng_8cpp_source.html">osrng.cpp</a>.</p>
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