void CRandomGenerator::Init()
{
NCrypto::NSha1::CContext hash;
hash.Init();
#ifdef _WIN32
DWORD w = ::GetCurrentProcessId();
hash.Update((const Byte *)&w, sizeof(w));
w = ::GetCurrentThreadId();
hash.Update((const Byte *)&w, sizeof(w));
#endif
for (int i = 0; i < 1000; i++)
{
#ifdef _WIN32
LARGE_INTEGER v;
if (::QueryPerformanceCounter(&v))
hash.Update((const Byte *)&v.QuadPart, sizeof(v.QuadPart));
#endif
DWORD tickCount = ::GetTickCount();
hash.Update((const Byte *)&tickCount, sizeof(tickCount));
for (int j = 0; j < 100; j++)
{
hash.Final(_buff);
hash.Init();
hash.Update(_buff, NCrypto::NSha1::kDigestSize);
}
}
hash.Final(_buff);
_needInit = false;
}
void CRandomGenerator::Init()
{
NCrypto::NSha1::CContext hash;
hash.Init();
#ifdef _WIN32
DWORD w = ::GetCurrentProcessId();
hash.Update((const Byte *)&w, sizeof(w));
w = ::GetCurrentThreadId();
hash.Update((const Byte *)&w, sizeof(w));
#else
pid_t pid = getpid();
hash.Update((const Byte *)&pid, sizeof(pid));
pid = getppid();
hash.Update((const Byte *)&pid, sizeof(pid));
#endif
for (int i = 0; i < 1000; i++)
{
#ifdef _WIN32
LARGE_INTEGER v;
if (::QueryPerformanceCounter(&v))
hash.Update((const Byte *)&v.QuadPart, sizeof(v.QuadPart));
#endif
#ifdef USE_POSIX_TIME
#ifdef USE_POSIX_TIME2
timeval v;
if (gettimeofday(&v, 0) == 0)
{
hash.Update((const Byte *)&v.tv_sec, sizeof(v.tv_sec));
hash.Update((const Byte *)&v.tv_usec, sizeof(v.tv_usec));
}
#endif
time_t v2 = time(NULL);
hash.Update((const Byte *)&v2, sizeof(v2));
#endif
DWORD tickCount = ::GetTickCount();
hash.Update((const Byte *)&tickCount, sizeof(tickCount));
for (int j = 0; j < 100; j++)
{
hash.Final(_buff);
hash.Init();
hash.Update(_buff, NCrypto::NSha1::kDigestSize);
}
}
hash.Final(_buff);
_needInit = false;
}
void CRandomGenerator::Generate(Byte *data, unsigned int size)
{
g_CriticalSection.Enter();
if (_needInit)
Init();
while (size > 0)
{
NCrypto::NSha1::CContext hash;
hash.Init();
hash.Update(_buff, NCrypto::NSha1::kDigestSize);
hash.Final(_buff);
hash.Init();
UInt32 salt = 0xF672ABD1;
hash.Update((const Byte *)&salt, sizeof(salt));
hash.Update(_buff, NCrypto::NSha1::kDigestSize);
Byte buff[NCrypto::NSha1::kDigestSize];
hash.Final(buff);
for (unsigned int i = 0; i < NCrypto::NSha1::kDigestSize && size > 0; i++, size--)
*data++ = buff[i];
}
g_CriticalSection.Leave();
}