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<div class="title">Random Functions<div class="ingroups"><a class="el" href="group___a_p_r.html">Apache Portability Runtime library</a></div></div> </div>
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Collaboration diagram for Random Functions:</div>
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Data Structures</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="typedef-members"></a>
Typedefs</h2></td></tr>
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typedef struct <a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> </td><td class="memItemRight" valign="bottom"><b>apr_crypto_hash_t</b></td></tr>
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<tr class="memitem:gad2775bc1cdb376d9dec0e97283b4bdd9"><td class="memItemLeft" align="right" valign="top"><a id="gad2775bc1cdb376d9dec0e97283b4bdd9"></a>
typedef void </td><td class="memItemRight" valign="bottom"><b>apr_crypto_hash_init_t</b>(<a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash)</td></tr>
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<tr class="memitem:ga2f8a4fb18078a76357327ea55936c1ea"><td class="memItemLeft" align="right" valign="top"><a id="ga2f8a4fb18078a76357327ea55936c1ea"></a>
typedef void </td><td class="memItemRight" valign="bottom"><b>apr_crypto_hash_add_t</b>(<a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash, const void *data, apr_size_t bytes)</td></tr>
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typedef void </td><td class="memItemRight" valign="bottom"><b>apr_crypto_hash_finish_t</b>(<a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash, unsigned char *result)</td></tr>
<tr class="separator:gab70ea9133870efdb5532d20d4bcf7442"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga33073741e56b1bafe52ba58cefcbbf96"><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga564e4c380e820a9b0d9e877d4852a65e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga564e4c380e820a9b0d9e877d4852a65e">apr_generate_random_bytes</a> (unsigned char *buf, apr_size_t length)</td></tr>
<tr class="separator:ga564e4c380e820a9b0d9e877d4852a65e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae992c6f642e9661d2417cd8f2df8d345"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#gae992c6f642e9661d2417cd8f2df8d345">apr_crypto_sha256_new</a> (<a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p)</td></tr>
<tr class="separator:gae992c6f642e9661d2417cd8f2df8d345"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0184a90774212132f883c463811aacdc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga0184a90774212132f883c463811aacdc">apr_random_init</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *g, <a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p, <a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *pool_hash, <a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *key_hash, <a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *prng_hash)</td></tr>
<tr class="separator:ga0184a90774212132f883c463811aacdc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7a73c9bcf026b63847aeae483c53191f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga7a73c9bcf026b63847aeae483c53191f">apr_random_standard_new</a> (<a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p)</td></tr>
<tr class="separator:ga7a73c9bcf026b63847aeae483c53191f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8cf2875644c1dffc0c336289bd370efb"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga8cf2875644c1dffc0c336289bd370efb">apr_random_add_entropy</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *g, const void *entropy_, apr_size_t bytes)</td></tr>
<tr class="separator:ga8cf2875644c1dffc0c336289bd370efb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab9a63359bb9543d746e6fd46933b7256"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#gab9a63359bb9543d746e6fd46933b7256">apr_random_insecure_bytes</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *g, void *random, apr_size_t bytes)</td></tr>
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<tr class="memitem:ga9f0607e06656a1c76cc5ee878fd94f09"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga9f0607e06656a1c76cc5ee878fd94f09">apr_random_secure_bytes</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *g, void *random, apr_size_t bytes)</td></tr>
<tr class="separator:ga9f0607e06656a1c76cc5ee878fd94f09"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga37d8d7529cf972c605ebce97c57f8825"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga37d8d7529cf972c605ebce97c57f8825">apr_random_barrier</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *g)</td></tr>
<tr class="separator:ga37d8d7529cf972c605ebce97c57f8825"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga99d0c0722eeef2951e8ccede2e1451fa"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga99d0c0722eeef2951e8ccede2e1451fa">apr_random_secure_ready</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *r)</td></tr>
<tr class="separator:ga99d0c0722eeef2951e8ccede2e1451fa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6465698bdc752d07abc8c515aac6e2c0"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#ga6465698bdc752d07abc8c515aac6e2c0">apr_random_insecure_ready</a> (<a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> *r)</td></tr>
<tr class="separator:ga6465698bdc752d07abc8c515aac6e2c0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa1ab9b8adeeb6e37bb29def249ff9e6a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__apr__random.html#gaa1ab9b8adeeb6e37bb29def249ff9e6a">apr_random_after_fork</a> (<a class="el" href="structapr__proc__t.html">apr_proc_t</a> *proc)</td></tr>
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</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Typedef Documentation</h2>
<a id="ga33073741e56b1bafe52ba58cefcbbf96"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga33073741e56b1bafe52ba58cefcbbf96">◆ </a></span>apr_random_t</h2>
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<td class="memname">typedef struct <a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> <a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a></td>
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<p>Opaque PRNG structure. </p>
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</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="gae992c6f642e9661d2417cd8f2df8d345"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae992c6f642e9661d2417cd8f2df8d345">◆ </a></span>apr_crypto_sha256_new()</h2>
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<td class="memname"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a>* apr_crypto_sha256_new </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>p</em></td><td>)</td>
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<p>Allocate and initialize the SHA-256 context </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>The pool to allocate from </td></tr>
</table>
</dd>
</dl>
</div>
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<a id="ga564e4c380e820a9b0d9e877d4852a65e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga564e4c380e820a9b0d9e877d4852a65e">◆ </a></span>apr_generate_random_bytes()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_generate_random_bytes </td>
<td>(</td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>buf</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>length</em> </td>
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<td></td>
<td>)</td>
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<p>Generate random bytes. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">buf</td><td>Buffer to fill with random bytes </td></tr>
<tr><td class="paramname">length</td><td>Length of buffer in bytes </td></tr>
</table>
</dd>
</dl>
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<a id="ga8cf2875644c1dffc0c336289bd370efb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga8cf2875644c1dffc0c336289bd370efb">◆ </a></span>apr_random_add_entropy()</h2>
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<td class="memname">void apr_random_add_entropy </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>g</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const void * </td>
<td class="paramname"><em>entropy_</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>bytes</em> </td>
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<td></td>
<td>)</td>
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<p>Mix the randomness pools. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">g</td><td>The PRNG state </td></tr>
<tr><td class="paramname">entropy_</td><td>Entropy buffer </td></tr>
<tr><td class="paramname">bytes</td><td>Length of entropy_ in bytes </td></tr>
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</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa1ab9b8adeeb6e37bb29def249ff9e6a">◆ </a></span>apr_random_after_fork()</h2>
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<td class="memname">void apr_random_after_fork </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structapr__proc__t.html">apr_proc_t</a> * </td>
<td class="paramname"><em>proc</em></td><td>)</td>
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<p>Mix the randomness pools after forking. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">proc</td><td>The resulting process handle from apr_proc_fork() </td></tr>
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</dd>
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<dl class="section remark"><dt>Remarks</dt><dd>Call this in the child after forking to mix the randomness pools. Note that its generally a bad idea to fork a process with a real PRNG in it - better to have the PRNG externally and get the randomness from there. However, if you really must do it, then you should supply all your entropy to all the PRNGs - don't worry, they won't produce the same output. </dd>
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Note that apr_proc_fork() calls this for you, so only weird applications need ever call it themselves. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga37d8d7529cf972c605ebce97c57f8825">◆ </a></span>apr_random_barrier()</h2>
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<td class="memname">void apr_random_barrier </td>
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<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>g</em></td><td>)</td>
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<p>Ensures that E bits of conditional entropy are mixed into the PRNG before any further randomness is extracted. </p><dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">g</td><td>The RNG state </td></tr>
</table>
</dd>
</dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0184a90774212132f883c463811aacdc">◆ </a></span>apr_random_init()</h2>
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<td class="memname">void apr_random_init </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>g</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>p</em>, </td>
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<td></td>
<td class="paramtype"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> * </td>
<td class="paramname"><em>pool_hash</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> * </td>
<td class="paramname"><em>key_hash</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> * </td>
<td class="paramname"><em>prng_hash</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>Initialize a PRNG state </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">g</td><td>The PRNG state </td></tr>
<tr><td class="paramname">p</td><td>The pool to allocate from </td></tr>
<tr><td class="paramname">pool_hash</td><td>Pool hash functions </td></tr>
<tr><td class="paramname">key_hash</td><td>Key hash functions </td></tr>
<tr><td class="paramname">prng_hash</td><td>PRNG hash functions </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="gab9a63359bb9543d746e6fd46933b7256"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gab9a63359bb9543d746e6fd46933b7256">◆ </a></span>apr_random_insecure_bytes()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_random_insecure_bytes </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>g</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>random</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>bytes</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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<p>Generate cryptographically insecure random bytes. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">g</td><td>The RNG state </td></tr>
<tr><td class="paramname">random</td><td>Buffer to fill with random bytes </td></tr>
<tr><td class="paramname">bytes</td><td>Length of buffer in bytes </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a id="ga6465698bdc752d07abc8c515aac6e2c0"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga6465698bdc752d07abc8c515aac6e2c0">◆ </a></span>apr_random_insecure_ready()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_random_insecure_ready </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>r</em></td><td>)</td>
<td></td>
</tr>
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<p>Return APR_SUCCESS if the PRNG has been seeded with enough data, APR_ENOTENOUGHENTROPY otherwise. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">r</td><td>The PRNG state </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga9f0607e06656a1c76cc5ee878fd94f09">◆ </a></span>apr_random_secure_bytes()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_random_secure_bytes </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>g</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>random</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_size_t </td>
<td class="paramname"><em>bytes</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>Generate cryptographically secure random bytes. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">g</td><td>The RNG state </td></tr>
<tr><td class="paramname">random</td><td>Buffer to fill with random bytes </td></tr>
<tr><td class="paramname">bytes</td><td>Length of buffer in bytes </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga99d0c0722eeef2951e8ccede2e1451fa">◆ </a></span>apr_random_secure_ready()</h2>
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<td class="memname"><a class="el" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a> apr_random_secure_ready </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> * </td>
<td class="paramname"><em>r</em></td><td>)</td>
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<p>Return APR_SUCCESS if the cryptographic PRNG has been seeded with enough data, APR_ENOTENOUGHENTROPY otherwise. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">r</td><td>The RNG state </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga7a73c9bcf026b63847aeae483c53191f">◆ </a></span>apr_random_standard_new()</h2>
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<td class="memname"><a class="el" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a>* apr_random_standard_new </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> * </td>
<td class="paramname"><em>p</em></td><td>)</td>
<td></td>
</tr>
</table>
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<p>Allocate and initialize (apr_crypto_sha256_new) a new PRNG state. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">p</td><td>The pool to allocate from </td></tr>
</table>
</dd>
</dl>
</div>
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