00001
00002
00003
00004
00005 #include "pch.h"
00006
00007 #ifndef CRYPTOPP_IMPORTS
00008
00009 #include "osrng.h"
00010
00011 #ifdef OS_RNG_AVAILABLE
00012
00013 #include "rng.h"
00014
00015 #ifdef CRYPTOPP_WIN32_AVAILABLE
00016 #ifndef _WIN32_WINNT
00017 #define _WIN32_WINNT 0x0400
00018 #endif
00019 #include <windows.h>
00020 #include <wincrypt.h>
00021 #endif
00022
00023 #ifdef CRYPTOPP_UNIX_AVAILABLE
00024 #include <errno.h>
00025 #include <fcntl.h>
00026 #include <unistd.h>
00027 #endif
00028
00029 NAMESPACE_BEGIN(CryptoPP)
00030
00031 #if defined(NONBLOCKING_RNG_AVAILABLE) || defined(BLOCKING_RNG_AVAILABLE)
00032 OS_RNG_Err::OS_RNG_Err(const std::string &operation)
00033 : Exception(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 #endif
00043
00044 #ifdef NONBLOCKING_RNG_AVAILABLE
00045
00046 #ifdef CRYPTOPP_WIN32_AVAILABLE
00047
00048 MicrosoftCryptoProvider::MicrosoftCryptoProvider()
00049 {
00050 if(!CryptAcquireContext(&m_hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
00051 throw OS_RNG_Err("CryptAcquireContext");
00052 }
00053
00054 MicrosoftCryptoProvider::~MicrosoftCryptoProvider()
00055 {
00056 CryptReleaseContext(m_hProvider, 0);
00057 }
00058
00059 #endif
00060
00061 NonblockingRng::NonblockingRng()
00062 {
00063 #ifndef CRYPTOPP_WIN32_AVAILABLE
00064 m_fd = open("/dev/urandom",O_RDONLY);
00065 if (m_fd == -1)
00066 throw OS_RNG_Err("open /dev/urandom");
00067 #endif
00068 }
00069
00070 NonblockingRng::~NonblockingRng()
00071 {
00072 #ifndef CRYPTOPP_WIN32_AVAILABLE
00073 close(m_fd);
00074 #endif
00075 }
00076
00077 void NonblockingRng::GenerateBlock(byte *output, size_t size)
00078 {
00079 #ifdef CRYPTOPP_WIN32_AVAILABLE
00080 # ifdef WORKAROUND_MS_BUG_Q258000
00081 const MicrosoftCryptoProvider &m_Provider = Singleton<MicrosoftCryptoProvider>().Ref();
00082 # endif
00083 if (!CryptGenRandom(m_Provider.GetProviderHandle(), (DWORD)size, output))
00084 throw OS_RNG_Err("CryptGenRandom");
00085 #else
00086 if (read(m_fd, output, size) != size)
00087 throw OS_RNG_Err("read /dev/urandom");
00088 #endif
00089 }
00090
00091 #endif
00092
00093
00094
00095 #ifdef BLOCKING_RNG_AVAILABLE
00096
00097 #ifndef CRYPTOPP_BLOCKING_RNG_FILENAME
00098 #ifdef __OpenBSD__
00099 #define CRYPTOPP_BLOCKING_RNG_FILENAME "/dev/srandom"
00100 #else
00101 #define CRYPTOPP_BLOCKING_RNG_FILENAME "/dev/random"
00102 #endif
00103 #endif
00104
00105 BlockingRng::BlockingRng()
00106 {
00107 m_fd = open(CRYPTOPP_BLOCKING_RNG_FILENAME,O_RDONLY);
00108 if (m_fd == -1)
00109 throw OS_RNG_Err("open " CRYPTOPP_BLOCKING_RNG_FILENAME);
00110 }
00111
00112 BlockingRng::~BlockingRng()
00113 {
00114 close(m_fd);
00115 }
00116
00117 void BlockingRng::GenerateBlock(byte *output, size_t size)
00118 {
00119 while (size)
00120 {
00121
00122
00123 ssize_t len = read(m_fd, output, size);
00124 if (len < 0)
00125 throw OS_RNG_Err("read " CRYPTOPP_BLOCKING_RNG_FILENAME);
00126 size -= len;
00127 output += len;
00128 if (size)
00129 sleep(1);
00130 }
00131 }
00132
00133 #endif
00134
00135
00136
00137 void OS_GenerateRandomBlock(bool blocking, byte *output, size_t size)
00138 {
00139 #ifdef NONBLOCKING_RNG_AVAILABLE
00140 if (blocking)
00141 #endif
00142 {
00143 #ifdef BLOCKING_RNG_AVAILABLE
00144 BlockingRng rng;
00145 rng.GenerateBlock(output, size);
00146 #endif
00147 }
00148
00149 #ifdef BLOCKING_RNG_AVAILABLE
00150 if (!blocking)
00151 #endif
00152 {
00153 #ifdef NONBLOCKING_RNG_AVAILABLE
00154 NonblockingRng rng;
00155 rng.GenerateBlock(output, size);
00156 #endif
00157 }
00158 }
00159
00160 void AutoSeededRandomPool::Reseed(bool blocking, unsigned int seedSize)
00161 {
00162 SecByteBlock seed(seedSize);
00163 OS_GenerateRandomBlock(blocking, seed, seedSize);
00164 IncorporateEntropy(seed, seedSize);
00165 }
00166
00167 NAMESPACE_END
00168
00169 #endif
00170
00171 #endif