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/*
* Win32 EntropySource
* (C) 1999-2009,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/es_win32.h>
#define NOMINMAX 1
#define _WINSOCKAPI_ // stop windows.h including winsock.h
#include <windows.h>
#include <tlhelp32.h>
namespace Botan {
/**
* Win32 poll using stats functions including Tooltip32
*/
size_t Win32_EntropySource::poll(RandomNumberGenerator& rng)
{
const size_t POLL_TARGET = 128;
const size_t EST_ENTROPY_HEAP_INFO = 4;
const size_t EST_ENTROPY_THREAD_INFO = 2;
/*
First query a bunch of basic statistical stuff
*/
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);
rng.add_entropy_T(sys_info);
MEMORYSTATUSEX mem_info;
::GlobalMemoryStatusEx(&mem_info);
rng.add_entropy_T(mem_info);
POINT point;
::GetCursorPos(&point);
rng.add_entropy_T(point);
::GetCaretPos(&point);
rng.add_entropy_T(point);
/*
Now use the Tooltip library to iterate through various objects on
the system, including processes, threads, and heap objects.
*/
HANDLE snapshot = ::CreateToolhelp32Snapshot(TH32CS_SNAPALL, 0);
size_t collected = 0;
#define TOOLHELP32_ITER(DATA_TYPE, FUNC_FIRST, FUNC_NEXT) \
if(collected < POLL_TARGET) \
{ \
DATA_TYPE info; \
info.dwSize = sizeof(DATA_TYPE); \
if(FUNC_FIRST(snapshot, &info)) \
{ \
do \
{ \
rng.add_entropy_T(info); \
collected += EST_ENTROPY_THREAD_INFO; \
if(collected >= POLL_TARGET) \
break; \
} while(FUNC_NEXT(snapshot, &info)); \
} \
}
TOOLHELP32_ITER(MODULEENTRY32, ::Module32First, ::Module32Next);
TOOLHELP32_ITER(PROCESSENTRY32, ::Process32First, ::Process32Next);
TOOLHELP32_ITER(THREADENTRY32, ::Thread32First, ::Thread32Next);
#undef TOOLHELP32_ITER
if(collected < POLL_TARGET)
{
HEAPLIST32 heap_list;
heap_list.dwSize = sizeof(HEAPLIST32);
if(::Heap32ListFirst(snapshot, &heap_list))
{
do
{
rng.add_entropy_T(heap_list);
HEAPENTRY32 heap_entry;
heap_entry.dwSize = sizeof(HEAPENTRY32);
if(::Heap32First(&heap_entry,
heap_list.th32ProcessID,
heap_list.th32HeapID))
{
do
{
rng.add_entropy_T(heap_entry);
collected += EST_ENTROPY_HEAP_INFO;
if(collected >= POLL_TARGET)
break;
} while(::Heap32Next(&heap_entry));
}
if(collected >= POLL_TARGET)
break;
} while(::Heap32ListNext(snapshot, &heap_list));
}
}
::CloseHandle(snapshot);
return collected;
}
}
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