osrng_8cpp-source.html

著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00079"></a>00079 <span class="preprocessor">#ifdef CRYPTOPP_WIN32_AVAILABLE</span>
<a name="l00080"></a>00080 <span class="preprocessor"></span><span class="preprocessor">#       ifdef WORKAROUND_MS_BUG_Q258000</span>
<a name="l00081"></a>00081 <span class="preprocessor"></span>                <span class="keyword">const</span> <a class="code" href="class_microsoft_crypto_provider.html">MicrosoftCryptoProvider</a> &amp;m_Provider = <a class="code" href="class_singleton.html">Singleton&lt;MicrosoftCryptoProvider&gt;</a>().Ref();
<a name="l00082"></a>00082 <span class="preprocessor">#       endif</span>
<a name="l00083"></a>00083 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (!CryptGenRandom(m_Provider.<a class="code" href="class_microsoft_crypto_provider.html#f2028181c1406ee7446a603e66dd06ab">GetProviderHandle</a>(), (DWORD)size, output))
<a name="l00084"></a>00084                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html" title="Exception class for Operating-System Random Number Generator.">OS_RNG_Err</a>(<span class="stringliteral">"CryptGenRandom"</span>);
<a name="l00085"></a>00085 <span class="preprocessor">#else</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (read(m_fd, output, size) != size)
<a name="l00087"></a>00087                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html" title="Exception class for Operating-System Random Number Generator.">OS_RNG_Err</a>(<span class="stringliteral">"read /dev/urandom"</span>);
<a name="l00088"></a>00088 <span class="preprocessor">#endif</span>
<a name="l00089"></a>00089 <span class="preprocessor"></span>}
<a name="l00090"></a>00090 
<a name="l00091"></a>00091 <span class="preprocessor">#endif</span>
<a name="l00092"></a>00092 <span class="preprocessor"></span>
<a name="l00093"></a>00093 <span class="comment">// *************************************************************</span>
<a name="l00094"></a>00094 
<a name="l00095"></a>00095 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
<a name="l00096"></a>00096 <span class="preprocessor"></span>
<a name="l00097"></a>00097 <span class="preprocessor">#ifndef CRYPTOPP_BLOCKING_RNG_FILENAME</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span><span class="preprocessor">#ifdef __OpenBSD__</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_BLOCKING_RNG_FILENAME "/dev/srandom"</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00101"></a>00101 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_BLOCKING_RNG_FILENAME "/dev/random"</span>
<a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00103"></a>00103 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>
<a name="l00105"></a><a class="code" href="class_blocking_rng.html#df9e446f27cb7adea7b59d4f1b340548">00105</a> <a class="code" href="class_blocking_rng.html#df9e446f27cb7adea7b59d4f1b340548">BlockingRng::BlockingRng</a>()
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107         <a class="code" href="class_blocking_rng.html#9ff90fdef665fd4eea94e0a930a5eebd">m_fd</a> = open(CRYPTOPP_BLOCKING_RNG_FILENAME,O_RDONLY);
<a name="l00108"></a>00108         <span class="keywordflow">if</span> (<a class="code" href="class_blocking_rng.html#9ff90fdef665fd4eea94e0a930a5eebd">m_fd</a> == -1)
<a name="l00109"></a>00109                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html" title="Exception class for Operating-System Random Number Generator.">OS_RNG_Err</a>(<span class="stringliteral">"open "</span> CRYPTOPP_BLOCKING_RNG_FILENAME);
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 
<a name="l00112"></a><a class="code" href="class_blocking_rng.html#268f97af3cdc566cdced458b5599c8cb">00112</a> <a class="code" href="class_blocking_rng.html#268f97af3cdc566cdced458b5599c8cb">BlockingRng::~BlockingRng</a>()
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114         close(<a class="code" href="class_blocking_rng.html#9ff90fdef665fd4eea94e0a930a5eebd">m_fd</a>);
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 
<a name="l00117"></a><a class="code" href="class_blocking_rng.html#1a24b9997e9cc4fac00b093afa367d50">00117</a> <span class="keywordtype">void</span> <a class="code" href="class_blocking_rng.html#1a24b9997e9cc4fac00b093afa367d50" title="generate random array of bytes">BlockingRng::GenerateBlock</a>(byte *output, <span class="keywordtype">size_t</span> size)
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119         <span class="keywordflow">while</span> (size)
<a name="l00120"></a>00120         {
<a name="l00121"></a>00121                 <span class="comment">// on some systems /dev/random will block until all bytes</span>
<a name="l00122"></a>00122                 <span class="comment">// are available, on others it will returns immediately</span>
<a name="l00123"></a>00123                 ssize_t len = read(<a class="code" href="class_blocking_rng.html#9ff90fdef665fd4eea94e0a930a5eebd">m_fd</a>, output, size);
<a name="l00124"></a>00124                 <span class="keywordflow">if</span> (len &lt; 0)
<a name="l00125"></a>00125                         <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html" title="Exception class for Operating-System Random Number Generator.">OS_RNG_Err</a>(<span class="stringliteral">"read "</span> CRYPTOPP_BLOCKING_RNG_FILENAME);
<a name="l00126"></a>00126                 size -= len;
<a name="l00127"></a>00127                 output += len;
<a name="l00128"></a>00128                 <span class="keywordflow">if</span> (size)
<a name="l00129"></a>00129                         sleep(1);
<a name="l00130"></a>00130         }
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 
<a name="l00133"></a>00133 <span class="preprocessor">#endif</span>
<a name="l00134"></a>00134 <span class="preprocessor"></span>
<a name="l00135"></a>00135 <span class="comment">// *************************************************************</span>
<a name="l00136"></a>00136 
<a name="l00137"></a>00137 <span class="keywordtype">void</span> OS_GenerateRandomBlock(<span class="keywordtype">bool</span> blocking, byte *output, <span class="keywordtype">size_t</span> size)
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 <span class="preprocessor">#ifdef NONBLOCKING_RNG_AVAILABLE</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (blocking)
<a name="l00141"></a>00141 <span class="preprocessor">#endif</span>
<a name="l00142"></a>00142 <span class="preprocessor"></span>        {
<a name="l00143"></a>00143 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
<a name="l00144"></a>00144 <span class="preprocessor"></span>                <a class="code" href="class_blocking_rng.html" title="encapsulate /dev/random, or /dev/srandom on OpenBSD">BlockingRng</a> rng;
<a name="l00145"></a>00145                 rng.<a class="code" href="class_blocking_rng.html#1a24b9997e9cc4fac00b093afa367d50" title="generate random array of bytes">GenerateBlock</a>(output, size);
<a name="l00146"></a>00146 <span class="preprocessor">#endif</span>
<a name="l00147"></a>00147 <span class="preprocessor"></span>        }
<a name="l00148"></a>00148 
<a name="l00149"></a>00149 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
<a name="l00150"></a>00150 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (!blocking)
<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">#ifdef NONBLOCKING_RNG_AVAILABLE</span>
<a name="l00154"></a>00154 <span class="preprocessor"></span>                <a class="code" href="class_nonblocking_rng.html" title="encapsulate CryptoAPI's CryptGenRandom or /dev/urandom">NonblockingRng</a> rng;
<a name="l00155"></a>00155                 rng.<a class="code" href="class_nonblocking_rng.html#c74f9b2acf05938b98eedc806c4c29d3" title="generate random array of bytes">GenerateBlock</a>(output, size);
<a name="l00156"></a>00156 <span class="preprocessor">#endif</span>
<a name="l00157"></a>00157 <span class="preprocessor"></span>        }
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 
<a name="l00160"></a><a class="code" href="class_auto_seeded_random_pool.html#14efa7036cde0f494b48668ebf305ba5">00160</a> <span class="keywordtype">void</span> <a class="code" href="class_auto_seeded_random_pool.html#14efa7036cde0f494b48668ebf305ba5">AutoSeededRandomPool::Reseed</a>(<span class="keywordtype">bool</span> blocking, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seedSize)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162         <a class="code" href="class_sec_block.html" title="a block of memory allocated using A">SecByteBlock</a> seed(seedSize);
<a name="l00163"></a>00163         OS_GenerateRandomBlock(blocking, seed, seedSize);
<a name="l00164"></a>00164         <a class="code" href="class_random_pool.html#4339d77cb309a5ee47d7a5f1751481f3" title="update RNG state with additional unpredictable values">IncorporateEntropy</a>(seed, seedSize);
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166 
<a name="l00167"></a>00167 NAMESPACE_END
<a name="l00168"></a>00168 
<a name="l00169"></a>00169 <span class="preprocessor">#endif</span>
<a name="l00170"></a>00170 <span class="preprocessor"></span>
<a name="l00171"></a>00171 <span class="preprocessor">#endif</span>
</pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:23 2007 for Crypto++ by&nbsp;
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address>
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