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<h1>apr_random.h</h1><a href="apr__random_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Licensed to the Apache Software Foundation (ASF) under one or more</span>
<a name="l00002"></a>00002 <span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span>
<a name="l00003"></a>00003 <span class="comment"> * this work for additional information regarding copyright ownership.</span>
<a name="l00004"></a>00004 <span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span>
<a name="l00005"></a>00005 <span class="comment"> * (the "License"); you may not use this file except in compliance with</span>
<a name="l00006"></a>00006 <span class="comment"> * the License. You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#ifndef APR_RANDOM_H</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#define APR_RANDOM_H</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="comment"></span>
<a name="l00020"></a>00020 <span class="comment">/**</span>
<a name="l00021"></a>00021 <span class="comment"> * @file apr_random.h</span>
<a name="l00022"></a>00022 <span class="comment"> * @brief APR PRNG routines</span>
<a name="l00023"></a>00023 <span class="comment"> */</span>
<a name="l00024"></a>00024
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="apr__pools_8h.html" title="APR memory allocation.">apr_pools.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="apr__thread__proc_8h.html" title="APR Thread and Process Library.">apr_thread_proc.h</a>"</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {
<a name="l00030"></a>00030 <span class="preprocessor">#endif </span><span class="comment">/* __cplusplus */</span>
<a name="l00031"></a>00031 <span class="comment"></span>
<a name="l00032"></a>00032 <span class="comment">/**</span>
<a name="l00033"></a>00033 <span class="comment"> * @defgroup apr_random PRNG Routines</span>
<a name="l00034"></a>00034 <span class="comment"> * @ingroup APR</span>
<a name="l00035"></a>00035 <span class="comment"> * @{</span>
<a name="l00036"></a>00036 <span class="comment"> */</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> <a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a>;
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="keyword">typedef</span> <span class="keywordtype">void</span> apr_crypto_hash_init_t(<a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash);
<a name="l00041"></a>00041 <span class="keyword">typedef</span> <span class="keywordtype">void</span> apr_crypto_hash_add_t(<a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash, <span class="keyword">const</span> <span class="keywordtype">void</span> *data,
<a name="l00042"></a>00042 apr_size_t bytes);
<a name="l00043"></a>00043 <span class="keyword">typedef</span> <span class="keywordtype">void</span> apr_crypto_hash_finish_t(<a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *hash,
<a name="l00044"></a>00044 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *result);
<a name="l00045"></a>00045
<a name="l00046"></a>00046
<a name="l00047"></a>00047 <span class="comment">/* FIXME: make this opaque */</span>
<a name="l00048"></a><a class="code" href="structapr__crypto__hash__t.html">00048</a> <span class="keyword">struct </span><a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> {
<a name="l00049"></a>00049 apr_crypto_hash_init_t *init;
<a name="l00050"></a>00050 apr_crypto_hash_add_t *add;
<a name="l00051"></a>00051 apr_crypto_hash_finish_t *finish;
<a name="l00052"></a>00052 apr_size_t size;
<a name="l00053"></a>00053 <span class="keywordtype">void</span> *data;
<a name="l00054"></a>00054 };
<a name="l00055"></a>00055 <span class="comment"></span>
<a name="l00056"></a>00056 <span class="comment">/**</span>
<a name="l00057"></a>00057 <span class="comment"> * Allocate and initialize the SHA-256 context</span>
<a name="l00058"></a>00058 <span class="comment"> * @param p The pool to allocate from</span>
<a name="l00059"></a>00059 <span class="comment"> */</span>
<a name="l00060"></a>00060 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *) <a class="code" href="group__apr__random.html#gae992c6f642e9661d2417cd8f2df8d345">apr_crypto_sha256_new</a>(<a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p);
<a name="l00061"></a>00061 <span class="comment"></span>
<a name="l00062"></a>00062 <span class="comment">/** Opaque PRNG structure. */</span>
<a name="l00063"></a><a class="code" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">00063</a> typedef struct <a class="code" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a> <a class="code" href="group__apr__random.html#ga33073741e56b1bafe52ba58cefcbbf96">apr_random_t</a>;
<a name="l00064"></a>00064 <span class="comment"></span>
<a name="l00065"></a>00065 <span class="comment">/**</span>
<a name="l00066"></a>00066 <span class="comment"> * Initialize a PRNG state</span>
<a name="l00067"></a>00067 <span class="comment"> * @param g The PRNG state</span>
<a name="l00068"></a>00068 <span class="comment"> * @param p The pool to allocate from</span>
<a name="l00069"></a>00069 <span class="comment"> * @param pool_hash Pool hash functions</span>
<a name="l00070"></a>00070 <span class="comment"> * @param key_hash Key hash functions</span>
<a name="l00071"></a>00071 <span class="comment"> * @param prng_hash PRNG hash functions</span>
<a name="l00072"></a>00072 <span class="comment"> */</span>
<a name="l00073"></a>00073 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<span class="keywordtype">void</span>) <a class="code" href="group__apr__random.html#ga0184a90774212132f883c463811aacdc">apr_random_init</a>(apr_random_t *g, <a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p,
<a name="l00074"></a>00074 <a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *pool_hash,
<a name="l00075"></a>00075 <a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *key_hash,
<a name="l00076"></a>00076 <a class="code" href="structapr__crypto__hash__t.html">apr_crypto_hash_t</a> *prng_hash);<span class="comment"></span>
<a name="l00077"></a>00077 <span class="comment">/**</span>
<a name="l00078"></a>00078 <span class="comment"> * Allocate and initialize (apr_crypto_sha256_new) a new PRNG state.</span>
<a name="l00079"></a>00079 <span class="comment"> * @param p The pool to allocate from</span>
<a name="l00080"></a>00080 <span class="comment"> */</span>
<a name="l00081"></a>00081 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(apr_random_t *) <a class="code" href="group__apr__random.html#ga7a73c9bcf026b63847aeae483c53191f">apr_random_standard_new</a>(<a class="code" href="group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb">apr_pool_t</a> *p);
<a name="l00082"></a>00082 <span class="comment"></span>
<a name="l00083"></a>00083 <span class="comment">/**</span>
<a name="l00084"></a>00084 <span class="comment"> * Mix the randomness pools.</span>
<a name="l00085"></a>00085 <span class="comment"> * @param g The PRNG state</span>
<a name="l00086"></a>00086 <span class="comment"> * @param entropy_ Entropy buffer</span>
<a name="l00087"></a>00087 <span class="comment"> * @param bytes Length of entropy_ in bytes</span>
<a name="l00088"></a>00088 <span class="comment"> */</span>
<a name="l00089"></a>00089 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<span class="keywordtype">void</span>) <a class="code" href="group__apr__random.html#ga8cf2875644c1dffc0c336289bd370efb">apr_random_add_entropy</a>(apr_random_t *g,
<a name="l00090"></a>00090 const <span class="keywordtype">void</span> *entropy_,
<a name="l00091"></a>00091 apr_size_t bytes);<span class="comment"></span>
<a name="l00092"></a>00092 <span class="comment">/**</span>
<a name="l00093"></a>00093 <span class="comment"> * Generate cryptographically insecure random bytes.</span>
<a name="l00094"></a>00094 <span class="comment"> * @param g The RNG state</span>
<a name="l00095"></a>00095 <span class="comment"> * @param random Buffer to fill with random bytes</span>
<a name="l00096"></a>00096 <span class="comment"> * @param bytes Length of buffer in bytes</span>
<a name="l00097"></a>00097 <span class="comment"> */</span>
<a name="l00098"></a>00098 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group__apr__random.html#gab9a63359bb9543d746e6fd46933b7256">apr_random_insecure_bytes</a>(apr_random_t *g,
<a name="l00099"></a>00099 <span class="keywordtype">void</span> *random,
<a name="l00100"></a>00100 apr_size_t bytes);
<a name="l00101"></a>00101 <span class="comment"></span>
<a name="l00102"></a>00102 <span class="comment">/**</span>
<a name="l00103"></a>00103 <span class="comment"> * Generate cryptographically secure random bytes.</span>
<a name="l00104"></a>00104 <span class="comment"> * @param g The RNG state</span>
<a name="l00105"></a>00105 <span class="comment"> * @param random Buffer to fill with random bytes</span>
<a name="l00106"></a>00106 <span class="comment"> * @param bytes Length of buffer in bytes</span>
<a name="l00107"></a>00107 <span class="comment"> */</span>
<a name="l00108"></a>00108 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group__apr__random.html#ga9f0607e06656a1c76cc5ee878fd94f09">apr_random_secure_bytes</a>(apr_random_t *g,
<a name="l00109"></a>00109 <span class="keywordtype">void</span> *random,
<a name="l00110"></a>00110 apr_size_t bytes);<span class="comment"></span>
<a name="l00111"></a>00111 <span class="comment">/**</span>
<a name="l00112"></a>00112 <span class="comment"> * Ensures that E bits of conditional entropy are mixed into the PRNG</span>
<a name="l00113"></a>00113 <span class="comment"> * before any further randomness is extracted.</span>
<a name="l00114"></a>00114 <span class="comment"> * @param g The RNG state</span>
<a name="l00115"></a>00115 <span class="comment"> */</span>
<a name="l00116"></a>00116 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<span class="keywordtype">void</span>) <a class="code" href="group__apr__random.html#ga37d8d7529cf972c605ebce97c57f8825">apr_random_barrier</a>(apr_random_t *g);
<a name="l00117"></a>00117 <span class="comment"></span>
<a name="l00118"></a>00118 <span class="comment">/**</span>
<a name="l00119"></a>00119 <span class="comment"> * Return APR_SUCCESS if the cryptographic PRNG has been seeded with</span>
<a name="l00120"></a>00120 <span class="comment"> * enough data, APR_ENOTENOUGHENTROPY otherwise.</span>
<a name="l00121"></a>00121 <span class="comment"> * @param r The RNG state</span>
<a name="l00122"></a>00122 <span class="comment"> */</span>
<a name="l00123"></a>00123 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group__apr__random.html#ga99d0c0722eeef2951e8ccede2e1451fa">apr_random_secure_ready</a>(apr_random_t *r);
<a name="l00124"></a>00124 <span class="comment"></span>
<a name="l00125"></a>00125 <span class="comment">/**</span>
<a name="l00126"></a>00126 <span class="comment"> * Return APR_SUCCESS if the PRNG has been seeded with enough data,</span>
<a name="l00127"></a>00127 <span class="comment"> * APR_ENOTENOUGHENTROPY otherwise.</span>
<a name="l00128"></a>00128 <span class="comment"> * @param r The PRNG state</span>
<a name="l00129"></a>00129 <span class="comment"> */</span>
<a name="l00130"></a>00130 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<a class="code" href="group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c">apr_status_t</a>) <a class="code" href="group__apr__random.html#ga6465698bdc752d07abc8c515aac6e2c0">apr_random_insecure_ready</a>(apr_random_t *r);
<a name="l00131"></a>00131 <span class="comment"></span>
<a name="l00132"></a>00132 <span class="comment">/**</span>
<a name="l00133"></a>00133 <span class="comment"> * Mix the randomness pools after forking.</span>
<a name="l00134"></a>00134 <span class="comment"> * @param proc The resulting process handle from apr_proc_fork()</span>
<a name="l00135"></a>00135 <span class="comment"> * @remark Call this in the child after forking to mix the randomness</span>
<a name="l00136"></a>00136 <span class="comment"> * pools. Note that its generally a bad idea to fork a process with a</span>
<a name="l00137"></a>00137 <span class="comment"> * real PRNG in it - better to have the PRNG externally and get the</span>
<a name="l00138"></a>00138 <span class="comment"> * randomness from there. However, if you really must do it, then you</span>
<a name="l00139"></a>00139 <span class="comment"> * should supply all your entropy to all the PRNGs - don't worry, they</span>
<a name="l00140"></a>00140 <span class="comment"> * won't produce the same output.</span>
<a name="l00141"></a>00141 <span class="comment"> * @remark Note that apr_proc_fork() calls this for you, so only weird</span>
<a name="l00142"></a>00142 <span class="comment"> * applications need ever call it themselves.</span>
<a name="l00143"></a>00143 <span class="comment"> * @internal</span>
<a name="l00144"></a>00144 <span class="comment"> */</span>
<a name="l00145"></a>00145 <a class="code" href="group__apr__platform.html#gad7b91b811a172bfa802603c2fb688f98">APR_DECLARE</a>(<span class="keywordtype">void</span>) <a class="code" href="group__apr__random.html#gaa1ab9b8adeeb6e37bb29def249ff9e6a">apr_random_after_fork</a>(<a class="code" href="structapr__proc__t.html">apr_proc_t</a> *proc);
<a name="l00146"></a>00146 <span class="comment"></span>
<a name="l00147"></a>00147 <span class="comment">/** @} */</span>
<a name="l00148"></a>00148
<a name="l00149"></a>00149 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00150"></a>00150 <span class="preprocessor"></span>}
<a name="l00151"></a>00151 <span class="preprocessor">#endif</span>
<a name="l00152"></a>00152 <span class="preprocessor"></span>
<a name="l00153"></a>00153 <span class="preprocessor">#endif </span><span class="comment">/* !APR_RANDOM_H */</span>
</pre></div></div>
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