Method of Operation
Microsoft-provided cryptography providers share the same implementation of CryptGenRandom, currently based on an internal function called RtlGenRandom. Only a general outline of the algorithm had been published as of 2007:
generates as specified in FIPS 186-2 appendix 3.1 with SHA-1 as the G function. And with entropy from:
- The current process ID (GetCurrentProcessID).
- The current thread ID (GetCurrentThreadID).
- The tick count since boot time (GetTickCount).
- The current time (GetLocalTime).
- Various high-precision performance counters (QueryPerformanceCounter).
- An MD4 hash of the user's environment block, which includes username, computer name, and search path.
- High-precision internal CPU counters, such as RDTSC, RDMSR, RDPMC
Read more about this topic: Crypt Gen Random
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