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<h1>osrng.cpp</h1><pre class="fragment"><div>00001 <span class="comment">// osrng.cpp - written and placed in the public domain by Wei Dai</span>
00002 
00003 <span class="comment">// Thanks to Leonard Janke for the suggestion for AutoSeededRandomPool.</span>
00004 
00005 <span class="preprocessor">#include "pch.h"</span>
00006 
00007 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span>
00008 <span class="preprocessor"></span>
00009 <span class="preprocessor">#include "osrng.h"</span>
00010 
00011 <span class="preprocessor">#ifdef OS_RNG_AVAILABLE</span>
00012 <span class="preprocessor"></span>
00013 <span class="preprocessor">#include "rng.h"</span>
00014 
00015 <span class="preprocessor">#ifdef CRYPTOPP_WIN32_AVAILABLE</span>
00016 <span class="preprocessor"></span><span class="preprocessor">#ifndef _WIN32_WINNT</span>
00017 <span class="preprocessor"></span><span class="preprocessor">#define _WIN32_WINNT 0x0400</span>
00018 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00019 <span class="preprocessor"></span><span class="preprocessor">#include &lt;windows.h&gt;</span>
00020 <span class="preprocessor">#include &lt;wincrypt.h&gt;</span>
00021 <span class="preprocessor">#endif</span>
00022 <span class="preprocessor"></span>
00023 <span class="preprocessor">#ifdef CRYPTOPP_UNIX_AVAILABLE</span>
00024 <span class="preprocessor"></span><span class="preprocessor">#include &lt;errno.h&gt;</span>
00025 <span class="preprocessor">#include &lt;fcntl.h&gt;</span>
00026 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
00027 <span class="preprocessor">#endif</span>
00028 <span class="preprocessor"></span>
00029 NAMESPACE_BEGIN(CryptoPP)
00030 
00031 #<span class="keywordflow">if</span> defined(NONBLOCKING_RNG_AVAILABLE) || defined(BLOCKING_RNG_AVAILABLE)
00032 <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>::<a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(const std::string &amp;operation)
00033         : <a class="code" href="class_exception.html">Exception</a>(OTHER_ERROR, "OS_Rng: " + operation + " operation failed with error " + 
00034 #ifdef CRYPTOPP_WIN32_AVAILABLE
00035                 "0x" + IntToString(GetLastError(), 16)
00036 #else
00037                 IntToString(errno)
00038 #endif
00039                 )
00040 {
00041 }
00042 <span class="preprocessor">#endif</span>
00043 <span class="preprocessor"></span>
00044 <span class="preprocessor">#ifdef NONBLOCKING_RNG_AVAILABLE</span>
00045 <span class="preprocessor"></span>
00046 <span class="preprocessor">#ifdef CRYPTOPP_WIN32_AVAILABLE</span>
00047 <span class="preprocessor"></span>
00048 MicrosoftCryptoProvider::MicrosoftCryptoProvider()
00049 {
00050         <span class="keywordflow">if</span>(!CryptAcquireContext(&amp;m_hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
00051                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"CryptAcquireContext"</span>);
00052 }
00053 
00054 MicrosoftCryptoProvider::~MicrosoftCryptoProvider()
00055 {
00056         CryptReleaseContext(m_hProvider, 0);
00057 }
00058 
00059 <span class="preprocessor">#endif</span>
00060 <span class="preprocessor"></span>
00061 NonblockingRng::NonblockingRng()
00062 {
00063 <span class="preprocessor">#ifndef CRYPTOPP_WIN32_AVAILABLE</span>
00064 <span class="preprocessor"></span>        m_fd = open(<span class="stringliteral">"/dev/urandom"</span>,O_RDONLY);
00065         <span class="keywordflow">if</span> (m_fd == -1)
00066                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"open /dev/urandom"</span>);
00067 <span class="preprocessor">#endif</span>
00068 <span class="preprocessor"></span>}
00069 
00070 NonblockingRng::~NonblockingRng()
00071 {
00072 <span class="preprocessor">#ifndef CRYPTOPP_WIN32_AVAILABLE</span>
00073 <span class="preprocessor"></span>        close(m_fd);
00074 <span class="preprocessor">#endif</span>
00075 <span class="preprocessor"></span>}
00076 
<a name="l00077"></a><a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga2">00077</a> byte <a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga2">NonblockingRng::GenerateByte</a>()
00078 {
00079         byte b;
00080         <a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga3">GenerateBlock</a>(&amp;b, 1);
00081         <span class="keywordflow">return</span> b;
00082 }
00083 
<a name="l00084"></a><a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga3">00084</a> <span class="keywordtype">void</span> <a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga3">NonblockingRng::GenerateBlock</a>(byte *output, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)
00085 {
00086 <span class="preprocessor">#ifdef CRYPTOPP_WIN32_AVAILABLE</span>
00087 <span class="preprocessor"></span><span class="preprocessor">#       ifdef WORKAROUND_MS_BUG_Q258000</span>
00088 <span class="preprocessor"></span>                <span class="keyword">static</span> MicrosoftCryptoProvider m_Provider;
00089 <span class="preprocessor">#       endif</span>
00090 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (!CryptGenRandom(m_Provider.GetProviderHandle(), size, output))
00091                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"CryptGenRandom"</span>);
00092 <span class="preprocessor">#else</span>
00093 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (read(m_fd, output, size) != size)
00094                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"read /dev/urandom"</span>);
00095 <span class="preprocessor">#endif</span>
00096 <span class="preprocessor"></span>}
00097 
00098 <span class="preprocessor">#endif</span>
00099 <span class="preprocessor"></span>
00100 <span class="comment">// *************************************************************</span>
00101 
00102 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
00103 <span class="preprocessor"></span>
00104 BlockingRng::BlockingRng()
00105 {
00106         m_fd = open(<span class="stringliteral">"/dev/random"</span>,O_RDONLY);
00107         <span class="keywordflow">if</span> (m_fd == -1)
00108                 <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"open /dev/random"</span>);
00109 }
00110 
00111 BlockingRng::~BlockingRng()
00112 {
00113         close(m_fd);
00114 }
00115 
<a name="l00116"></a><a class="code" href="class_blocking_rng.html#_blocking_rnga2">00116</a> byte <a class="code" href="class_blocking_rng.html#_blocking_rnga2">BlockingRng::GenerateByte</a>()
00117 {
00118         byte b;
00119         <a class="code" href="class_blocking_rng.html#_blocking_rnga3">GenerateBlock</a>(&amp;b, 1);
00120         <span class="keywordflow">return</span> b;
00121 }
00122 
<a name="l00123"></a><a class="code" href="class_blocking_rng.html#_blocking_rnga3">00123</a> <span class="keywordtype">void</span> <a class="code" href="class_blocking_rng.html#_blocking_rnga3">BlockingRng::GenerateBlock</a>(byte *output, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)
00124 {
00125         <span class="keywordflow">while</span> (size)
00126         {
00127                 <span class="comment">// on some systems /dev/random will block until all bytes</span>
00128                 <span class="comment">// are available, on others it will returns immediately</span>
00129                 <span class="keywordtype">int</span> len = read(m_fd, output, STDMIN(size, (<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)INT_MAX));
00130                 <span class="keywordflow">if</span> (len == -1)
00131                         <span class="keywordflow">throw</span> <a class="code" href="class_o_s___r_n_g___err.html">OS_RNG_Err</a>(<span class="stringliteral">"read /dev/random"</span>);
00132                 size -= len;
00133                 output += len;
00134                 <span class="keywordflow">if</span> (size)
00135                         sleep(1);
00136         }
00137 }
00138 
00139 <span class="preprocessor">#endif</span>
00140 <span class="preprocessor"></span>
00141 <span class="comment">// *************************************************************</span>
00142 
00143 <span class="keywordtype">void</span> OS_GenerateRandomBlock(<span class="keywordtype">bool</span> blocking, byte *output, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> size)
00144 {
00145 <span class="preprocessor">#ifdef NONBLOCKING_RNG_AVAILABLE</span>
00146 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (blocking)
00147 <span class="preprocessor">#endif</span>
00148 <span class="preprocessor"></span>        {
00149 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
00150 <span class="preprocessor"></span>                <a class="code" href="class_blocking_rng.html">BlockingRng</a> rng;
00151                 rng.<a class="code" href="class_blocking_rng.html#_blocking_rnga3">GenerateBlock</a>(output, size);
00152 <span class="preprocessor">#endif</span>
00153 <span class="preprocessor"></span>        }
00154 
00155 <span class="preprocessor">#ifdef BLOCKING_RNG_AVAILABLE</span>
00156 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (!blocking)
00157 <span class="preprocessor">#endif</span>
00158 <span class="preprocessor"></span>        {
00159 <span class="preprocessor">#ifdef NONBLOCKING_RNG_AVAILABLE</span>
00160 <span class="preprocessor"></span>                <a class="code" href="class_nonblocking_rng.html">NonblockingRng</a> rng;
00161                 rng.<a class="code" href="class_nonblocking_rng.html#_nonblocking_rnga3">GenerateBlock</a>(output, size);
00162 <span class="preprocessor">#endif</span>
00163 <span class="preprocessor"></span>        }
00164 }
00165 
00166 <span class="keywordtype">void</span> AutoSeededRandomPool::Reseed(<span class="keywordtype">bool</span> blocking, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> seedSize)
00167 {
00168         <a class="code" href="class_sec_block.html">SecByteBlock</a> seed(seedSize);
00169         OS_GenerateRandomBlock(blocking, seed, seedSize);
00170         <a class="code" href="class_buffered_transformation.html#_zlib_decompressorz1_0">Put</a>(seed, seedSize);
00171 }
00172 
00173 NAMESPACE_END
00174 
00175 <span class="preprocessor">#endif</span>
00176 <span class="preprocessor"></span>
00177 <span class="preprocessor">#endif</span>
</div></pre><hr size="1"><address style="align: right;"><small>Generated on Sun Nov 7 08:23:58 2004 for Crypto++ by
<a href="http://www.doxygen.org/index.html">
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