void CRandomGenerator::Init()
{
CSha256 hash;
Sha256_Init(&hash);
#ifdef _WIN32
DWORD w = ::GetCurrentProcessId();
HASH_UPD(w);
w = ::GetCurrentThreadId();
HASH_UPD(w);
#else
pid_t pid = getpid();
HASH_UPD(pid);
pid = getppid();
HASH_UPD(pid);
#endif
for (unsigned i = 0; i <
#ifdef _DEBUG
2;
#else
1000;
#endif
i++)
{
#ifdef _WIN32
LARGE_INTEGER v;
if (::QueryPerformanceCounter(&v))
HASH_UPD(v.QuadPart);
#endif
#ifdef USE_POSIX_TIME
#ifdef USE_POSIX_TIME2
timeval v;
if (gettimeofday(&v, 0) == 0)
{
HASH_UPD(v.tv_sec);
HASH_UPD(v.tv_usec);
}
#endif
time_t v2 = time(NULL);
HASH_UPD(v2);
#endif
#ifdef _WIN32
DWORD tickCount = ::GetTickCount();
HASH_UPD(tickCount);
#endif
for (unsigned j = 0; j < 100; j++)
{
Sha256_Final(&hash, _buff);
Sha256_Init(&hash);
Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
}
}
Sha256_Final(&hash, _buff);
_needInit = false;
}
void CRandomGenerator::Generate(Byte *data, unsigned size)
{
g_CriticalSection.Enter();
if (_needInit)
Init();
while (size > 0)
{
CSha256 hash;
Sha256_Init(&hash);
Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
Sha256_Final(&hash, _buff);
Sha256_Init(&hash);
UInt32 salt = 0xF672ABD1;
HASH_UPD(salt);
Sha256_Update(&hash, _buff, SHA256_DIGEST_SIZE);
Byte buff[SHA256_DIGEST_SIZE];
Sha256_Final(&hash, buff);
for (unsigned i = 0; i < SHA256_DIGEST_SIZE && size > 0; i++, size--)
*data++ = buff[i];
}
g_CriticalSection.Leave();
}
