es_win32.cpp

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/*
* (C) 1999-2009,2016,2020 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/internal/es_win32.h>
 
#include <botan/rng.h>
 
#define NOMINMAX 1
#define _WINSOCKAPI_  // stop windows.h including winsock.h
#include <windows.h>
 
namespace Botan {
 
size_t Win32_EntropySource::poll(RandomNumberGenerator& rng) {
   rng.add_entropy_T(::GetTickCount());
   rng.add_entropy_T(::GetMessagePos());
   rng.add_entropy_T(::GetMessageTime());
   rng.add_entropy_T(::GetInputState());
 
   rng.add_entropy_T(::GetCurrentProcessId());
   rng.add_entropy_T(::GetCurrentThreadId());
 
   SYSTEM_INFO sys_info{};
   ::GetSystemInfo(&sys_info);  // no return value
   rng.add_entropy_T(sys_info);
 
   MEMORYSTATUSEX mem_info{};
   mem_info.dwLength = sizeof(mem_info);
   if(::GlobalMemoryStatusEx(&mem_info) != 0) {
      rng.add_entropy_T(mem_info);
   }
 
   POINT point{};
   if(::GetCursorPos(&point) != 0) {
      rng.add_entropy_T(point);
   }
 
   if(::GetCaretPos(&point) != 0) {
      rng.add_entropy_T(point);
   }
 
   /*
   Potential other sources to investigate
 
   GetProductInfo
   GetComputerNameExA
   GetSystemFirmwareTable
   GetVersionExA
   GetProcessorSystemCycleTime
   GetProcessHandleCount(GetCurrentProcess())
   GetThreadTimes(GetCurrentThread())
   QueryThreadCycleTime
   QueryIdleProcessorCycleTime
   QueryUnbiasedInterruptTime
   */
 
   // We assume all of the above is basically junk
   return 0;
}
 
}  // namespace Botan