/*

Legal Notice: Some portions of the source code contained in this file were

derived from the source code of TrueCrypt 7.1a, which is

Copyright (c) 2003-2012 TrueCrypt Developers Association and which is

governed by the TrueCrypt License 3.0, also from the source code of

Encryption for the Masses 2.02a, which is Copyright (c) 1998-2000 Paul Le Roux

and which is governed by the 'License Agreement for Encryption for the Masses'

Modifications and additions to the original source code (contained in this file)

and all other portions of this file are Copyright (c) 2013-2017 IDRIX

and are governed by the Apache License 2.0 the full text of which is

contained in the file License.txt included in VeraCrypt binary and source

code distribution packages. */

#include "Tcdefs.h"

#include "Crc.h"

#include "Random.h"

#include "Dlgcode.h"

#include "Crypto\cpu.h"

#include "Crypto\jitterentropy.h"

#include "Crypto\rdrand.h"

#include <Strsafe.h>

static unsigned __int8 buffer[RNG_POOL_SIZE];

static unsigned char *pRandPool = NULL;

static BOOL bRandDidInit = FALSE;

static int nRandIndex = 0, randPoolReadIndex = 0;

static int HashFunction = DEFAULT_HASH_ALGORITHM;

static BOOL bDidSlowPoll = FALSE;

BOOL volatile bFastPollEnabled = TRUE; /* Used to reduce CPU load when performing benchmarks */

BOOL volatile bRandmixEnabled = TRUE; /* Used to reduce CPU load when performing benchmarks */

static BOOL RandomPoolEnrichedByUser = FALSE;

static HANDLE PeriodicFastPollThreadHandle = NULL;

/* Macro to add a single byte to the pool */

#define RandaddByte(x) {\

if (nRandIndex == RNG_POOL_SIZE) nRandIndex = 0;\

pRandPool[nRandIndex] = (unsigned char) ((unsigned char)x + pRandPool[nRandIndex]); \

if (nRandIndex % RANDMIX_BYTE_INTERVAL == 0) Randmix();\

nRandIndex++; \

}

/* Macro to add four bytes to the pool */

#define RandaddInt32(x) RandAddInt((unsigned __int32)x);

#ifdef _WIN64

#define RandaddIntPtr(x) RandAddInt64((unsigned __int64)x);

#else

#define RandaddIntPtr(x) RandAddInt((unsigned __int32)x);

#endif

void RandAddInt (unsigned __int32 x)

{

RandaddByte(x);

RandaddByte((x >> 8));

RandaddByte((x >> 16));

RandaddByte((x >> 24));

}

void RandAddInt64 (unsigned __int64 x)

{

RandaddByte(x);

RandaddByte((x >> 8));

RandaddByte((x >> 16));

RandaddByte((x >> 24));

RandaddByte((x >> 32));

RandaddByte((x >> 40));

RandaddByte((x >> 48));

RandaddByte((x >> 56));

}

#include <tlhelp32.h>

#include "Dlgcode.h"

#ifndef SRC_POS

#define SRC_POS (__FUNCTION__ ":" TC_TO_STRING(__LINE__))

#endif

HHOOK hMouse = NULL; /* Mouse hook for the random number generator */

HHOOK hKeyboard = NULL; /* Keyboard hook for the random number generator */

DWORD ProcessedMouseEventsCounter = 0;

/* Variables for thread control, the thread is used to gather up info about

the system in in the background */

CRITICAL_SECTION critRandProt; /* The critical section */

BOOL volatile bThreadTerminate = FALSE; /* This variable is shared among thread's so its made volatile */

/* Network library handle for the SlowPoll function */

HANDLE hNetAPI32 = NULL;

// CryptoAPI

BOOL CryptoAPIAvailable = FALSE;

DWORD CryptoAPILastError = ERROR_SUCCESS;

HCRYPTPROV hCryptProv;

/* Init the random number generator, setup the hooks, and start the thread */

int RandinitWithCheck ( int* pAlreadyInitialized)

{

BOOL bIgnoreHookError = FALSE;

DWORD dwLastError = ERROR_SUCCESS;

if (GetMaxPkcs5OutSize() > RNG_POOL_SIZE)

TC_THROW_FATAL_EXCEPTION;

if(bRandDidInit)

{

if (pAlreadyInitialized)

*pAlreadyInitialized = 1;

return 0;

}

if (pAlreadyInitialized)

*pAlreadyInitialized = 0;

InitializeCriticalSection (&critRandProt);

bRandDidInit = TRUE;

CryptoAPILastError = ERROR_SUCCESS;

ProcessedMouseEventsCounter = 0;

if (pRandPool == NULL)

{

pRandPool = (unsigned char *) _aligned_malloc (RANDOMPOOL_ALLOCSIZE, 16);

if (pRandPool == NULL)

goto error;

bDidSlowPoll = FALSE;

RandomPoolEnrichedByUser = FALSE;

memset (pRandPool, 0, RANDOMPOOL_ALLOCSIZE);

VirtualLock (pRandPool, RANDOMPOOL_ALLOCSIZE);

}

bIgnoreHookError = IsThreadInSecureDesktop(GetCurrentThreadId());

hKeyboard = SetWindowsHookEx (WH_KEYBOARD, (HOOKPROC)&KeyboardProc, NULL, GetCurrentThreadId ());

if (hKeyboard == 0 && !bIgnoreHookError) handleWin32Error (0, SRC_POS);

hMouse = SetWindowsHookEx (WH_MOUSE, (HOOKPROC)&MouseProc, NULL, GetCurrentThreadId ());

if (hMouse == 0 && !bIgnoreHookError)

{

handleWin32Error (0, SRC_POS);

goto error;

}

if (!CryptAcquireContext (&hCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))

{

CryptoAPIAvailable = FALSE;

CryptoAPILastError = GetLastError ();

goto error;

}

else

CryptoAPIAvailable = TRUE;

if (!(PeriodicFastPollThreadHandle = (HANDLE) _beginthreadex (NULL, 0, PeriodicFastPollThreadProc, NULL, 0, NULL)))

goto error;

return 0;

error:

dwLastError = GetLastError();

RandStop (TRUE);

SetLastError (dwLastError);

return 1;

}

int Randinit ()

{

return RandinitWithCheck (NULL);

}

/* Close everything down, including the thread which is closed down by

setting a flag which eventually causes the thread function to exit */

void RandStop (BOOL freePool)

{

if (!bRandDidInit && freePool && pRandPool)

goto freePool;

if (bRandDidInit == FALSE)

return;

EnterCriticalSection (&critRandProt);

if (hMouse != 0)

UnhookWindowsHookEx (hMouse);

if (hKeyboard != 0)

UnhookWindowsHookEx (hKeyboard);

bThreadTerminate = TRUE;

LeaveCriticalSection (&critRandProt);

if (PeriodicFastPollThreadHandle)

WaitForSingleObject (PeriodicFastPollThreadHandle, INFINITE);

if (hNetAPI32 != 0)

{

FreeLibrary (hNetAPI32);

hNetAPI32 = NULL;

}

if (CryptoAPIAvailable)

{

CryptReleaseContext (hCryptProv, 0);

CryptoAPIAvailable = FALSE;

CryptoAPILastError = ERROR_SUCCESS;

}

hMouse = NULL;

hKeyboard = NULL;

bThreadTerminate = FALSE;

DeleteCriticalSection (&critRandProt);

bRandDidInit = FALSE;

freePool:

if (freePool)

{

bDidSlowPoll = FALSE;

RandomPoolEnrichedByUser = FALSE;

if (pRandPool != NULL)

{

burn (pRandPool, RANDOMPOOL_ALLOCSIZE);

_aligned_free (pRandPool);

pRandPool = NULL;

}

}

}

BOOL IsRandomNumberGeneratorStarted ()

{

return bRandDidInit;

}

void RandSetHashFunction (int hash_algo_id)

{

if (HashIsDeprecated (hash_algo_id))

hash_algo_id = DEFAULT_HASH_ALGORITHM;

HashFunction = hash_algo_id;

}

int RandGetHashFunction (void)

{

return HashFunction;

}

void SetRandomPoolEnrichedByUserStatus (BOOL enriched)

{

RandomPoolEnrichedByUser = enriched;

}

BOOL IsRandomPoolEnrichedByUser ()

{

return RandomPoolEnrichedByUser;

}

/* The random pool mixing function */

BOOL Randmix ()

{

if (bRandmixEnabled)

{

unsigned char hashOutputBuffer [MAX_DIGESTSIZE];

WHIRLPOOL_CTX wctx;

blake2s_state bctx;

sha512_ctx sctx;

sha256_ctx s256ctx;

STREEBOG_CTX stctx;

int poolIndex, digestIndex, digestSize;

switch (HashFunction)

{

case BLAKE2S:

digestSize = BLAKE2S_DIGESTSIZE;

break;

case SHA512:

digestSize = SHA512_DIGESTSIZE;

break;

case SHA256:

digestSize = SHA256_DIGESTSIZE;

break;

case WHIRLPOOL:

digestSize = WHIRLPOOL_DIGESTSIZE;

break;

case STREEBOG:

digestSize = STREEBOG_DIGESTSIZE;

break;

default:

TC_THROW_FATAL_EXCEPTION;

}

if (RNG_POOL_SIZE % digestSize)

TC_THROW_FATAL_EXCEPTION;

for (poolIndex = 0; poolIndex < RNG_POOL_SIZE; poolIndex += digestSize)

{

/* Compute the message digest of the entire pool using the selected hash function. */

switch (HashFunction)

{

case BLAKE2S:

blake2s_init(&bctx);

blake2s_update(&bctx, pRandPool, RNG_POOL_SIZE);

blake2s_final(&bctx, hashOutputBuffer);

break;

case SHA512:

sha512_begin (&sctx);

sha512_hash (pRandPool, RNG_POOL_SIZE, &sctx);

sha512_end (hashOutputBuffer, &sctx);

break;

case SHA256:

sha256_begin (&s256ctx);

sha256_hash (pRandPool, RNG_POOL_SIZE, &s256ctx);

sha256_end (hashOutputBuffer, &s256ctx);

break;

case WHIRLPOOL:

WHIRLPOOL_init (&wctx);

WHIRLPOOL_add (pRandPool, RNG_POOL_SIZE, &wctx);

WHIRLPOOL_finalize (&wctx, hashOutputBuffer);

break;

case STREEBOG:

STREEBOG_init (&stctx);

STREEBOG_add (&stctx, pRandPool, RNG_POOL_SIZE);

STREEBOG_finalize (&stctx, hashOutputBuffer);

break;

default:

// Unknown/wrong ID

TC_THROW_FATAL_EXCEPTION;

}

/* XOR the resultant message digest to the pool at the poolIndex position. */

for (digestIndex = 0; digestIndex < digestSize; digestIndex++)

{

pRandPool [poolIndex + digestIndex] ^= hashOutputBuffer [digestIndex];

}

}

/* Prevent leaks */

burn (hashOutputBuffer, MAX_DIGESTSIZE);

switch (HashFunction)

{

case BLAKE2S:

burn (&bctx, sizeof(bctx));

break;

case SHA512:

burn (&sctx, sizeof(sctx));

break;

case SHA256:

burn (&s256ctx, sizeof(s256ctx));

break;

case WHIRLPOOL:

burn (&wctx, sizeof(wctx));

break;

case STREEBOG:

burn (&stctx, sizeof(sctx));

break;

default:

// Unknown/wrong ID

TC_THROW_FATAL_EXCEPTION;

}

}

return TRUE;

}

/* Add a buffer to the pool */

void RandaddBuf (void *buf, int len)

{

int i;

for (i = 0; i < len; i++)

{

RandaddByte (((unsigned char *) buf)[i]);

}

}

BOOL RandpeekBytes (void* hwndDlg, unsigned char *buf, int len, DWORD* mouseCounter)

{

if (!bRandDidInit)

return FALSE;

if (len > RNG_POOL_SIZE)

{

Error ("ERR_NOT_ENOUGH_RANDOM_DATA", (HWND) hwndDlg);

len = RNG_POOL_SIZE;

}

EnterCriticalSection (&critRandProt);

*mouseCounter = ProcessedMouseEventsCounter;

memcpy (buf, pRandPool, len);

LeaveCriticalSection (&critRandProt);

return TRUE;

}

/* Get len random bytes from the pool (max. RNG_POOL_SIZE bytes per a single call) */

BOOL RandgetBytes (void* hwndDlg, unsigned char *buf, int len, BOOL forceSlowPoll)

{

return RandgetBytesFull (hwndDlg, buf, len, forceSlowPoll, FALSE);

}

/* Get len random bytes from the pool.

* If allowAnyLength is FALSE, then len must be less or equal to RNG_POOL_SIZE

* If allowAnyLength is TRUE, then len can have any positive value

*/

BOOL RandgetBytesFull ( void* hwndDlg, unsigned char *buf , int len, BOOL forceSlowPoll , BOOL allowAnyLength)

{

int i, looplen;

BOOL ret = TRUE;

if (!bRandDidInit || HashFunction == 0)

TC_THROW_FATAL_EXCEPTION;

EnterCriticalSection (&critRandProt);

if (bDidSlowPoll == FALSE || forceSlowPoll)

{

if (!SlowPoll ())

{

handleError ((HWND) hwndDlg, ERR_CAPI_INIT_FAILED, SRC_POS);

ret = FALSE;

}

else

bDidSlowPoll = TRUE;

}

if (!FastPoll ())

{

handleError ((HWND) hwndDlg, ERR_CAPI_INIT_FAILED, SRC_POS);

ret = FALSE;

}

/* There's never more than RNG_POOL_SIZE worth of randomess */

if ( (!allowAnyLength) && (len > RNG_POOL_SIZE))

{

Error ("ERR_NOT_ENOUGH_RANDOM_DATA", (HWND) hwndDlg);

len = RNG_POOL_SIZE;

LeaveCriticalSection (&critRandProt);

return FALSE;

}

while (len > 0)

{

if (len > RNG_POOL_SIZE)

{

looplen = RNG_POOL_SIZE;

len -= RNG_POOL_SIZE;

}

else

{

looplen = len;

len = 0;

}

// this loop number of bytes is copied from pool to output buffer,

// pool is rehashed, and output buffer is XORed with new data from pool

for (i = 0; i < looplen; i++)

{

buf[i] = pRandPool[randPoolReadIndex++];

if (randPoolReadIndex == RNG_POOL_SIZE) randPoolReadIndex = 0;

}

/* Invert the pool */

for (i = 0; i < RNG_POOL_SIZE / 4; i++)

{

((unsigned __int32 *) pRandPool)[i] = ~((unsigned __int32 *) pRandPool)[i];

}

// Mix the pool

if (!FastPoll ())

ret = FALSE;

// XOR the current pool content into the output buffer to prevent pool state leaks

for (i = 0; i < looplen; i++)

{

buf[i] ^= pRandPool[randPoolReadIndex++];

if (randPoolReadIndex == RNG_POOL_SIZE) randPoolReadIndex = 0;

}

// increment the pointer for the next loop

buf += looplen;

}

LeaveCriticalSection (&critRandProt);

if (!ret)

TC_THROW_FATAL_EXCEPTION;

return ret;

}

/* Capture the mouse, and as long as the event is not the same as the last

two events, add the crc of the event, and the crc of the time difference

between this event and the last + the current time to the pool.

The role of CRC-32 is merely to perform diffusion. Note that the output

of CRC-32 is subsequently processed using a cryptographically secure hash

algorithm. */

LRESULT CALLBACK MouseProc (int nCode, WPARAM wParam, LPARAM lParam)

{

static DWORD dwLastTimer;

static unsigned __int32 lastCrc, lastCrc2;

static POINT lastPoint;

MOUSEHOOKSTRUCT *lpMouse = (MOUSEHOOKSTRUCT *) lParam;

if (nCode < 0)

return CallNextHookEx (hMouse, nCode, wParam, lParam);

else

{

DWORD dwTimer = GetTickCount ();

DWORD j = dwLastTimer - dwTimer;

unsigned __int32 crc = 0L;

int i;

POINT pt = lpMouse->pt;

dwLastTimer = dwTimer;

for (i = 0; i < sizeof (MOUSEHOOKSTRUCT); i++)

{

crc = UPDC32 (((unsigned char *) lpMouse)[i], crc);

}

if (crc != lastCrc && crc != lastCrc2)

{

unsigned __int32 timeCrc = 0L;

for (i = 0; i < 4; i++)

{

timeCrc = UPDC32 (((unsigned char *) &j)[i], timeCrc);

}

for (i = 0; i < 4; i++)

{

timeCrc = UPDC32 (((unsigned char *) &dwTimer)[i], timeCrc);

}

EnterCriticalSection (&critRandProt);

/* only count real mouse messages in entropy estimation */

if ( (nCode == HC_ACTION) && (wParam == WM_MOUSEMOVE)

&& ((pt.x != lastPoint.x) || (pt.y != lastPoint.y)))

{

ProcessedMouseEventsCounter++;

lastPoint = pt;

}

RandaddInt32 ((unsigned __int32) (crc + timeCrc));

LeaveCriticalSection (&critRandProt);

}

lastCrc2 = lastCrc;

lastCrc = crc;

}

return 0;

}

/* Capture the keyboard, as long as the event is not the same as the last two

events, add the crc of the event to the pool along with the crc of the time

difference between this event and the last. The role of CRC-32 is merely to

perform diffusion. Note that the output of CRC-32 is subsequently processed

using a cryptographically secure hash algorithm. */

LRESULT CALLBACK KeyboardProc (int nCode, WPARAM wParam, LPARAM lParam)

{

static int lLastKey, lLastKey2;

static DWORD dwLastTimer;

int nKey = (lParam & 0x00ff0000) >> 16;

int nCapture = 0;

if (nCode < 0)

return CallNextHookEx (hMouse, nCode, wParam, lParam);

if ((lParam & 0x0000ffff) == 1 && !(lParam & 0x20000000) &&

(lParam & 0x80000000))

{

if (nKey != lLastKey)

nCapture = 1; /* Capture this key */

else if (nKey != lLastKey2)

nCapture = 1; /* Allow for one repeat */

}

if (nCapture)

{

DWORD dwTimer = GetTickCount ();

DWORD j = dwLastTimer - dwTimer;

unsigned __int32 timeCrc = 0L;

int i;

dwLastTimer = dwTimer;

lLastKey2 = lLastKey;

lLastKey = nKey;

for (i = 0; i < 4; i++)

{

timeCrc = UPDC32 (((unsigned char *) &j)[i], timeCrc);

}

for (i = 0; i < 4; i++)

{

timeCrc = UPDC32 (((unsigned char *) &dwTimer)[i], timeCrc);

}

EnterCriticalSection (&critRandProt);

RandaddInt32 ((unsigned __int32) (GetCrc32((unsigned char*) &lParam, sizeof(lParam)) + timeCrc));

LeaveCriticalSection (&critRandProt);

}

return CallNextHookEx (hMouse, nCode, wParam, lParam);

}

/* This is the thread function which will poll the system for randomness */

static unsigned __stdcall PeriodicFastPollThreadProc (void *dummy)

{

UNREFERENCED_PARAMETER (dummy); /* Remove unused parameter warning */

for (;;)

{

EnterCriticalSection (&critRandProt);

if (bThreadTerminate)

{

bThreadTerminate = FALSE;

LeaveCriticalSection (&critRandProt);

_endthreadex (0);

}

else if (bFastPollEnabled)

{

FastPoll ();

}

LeaveCriticalSection (&critRandProt);

Sleep (FASTPOLL_INTERVAL);

}

}

/* Type definitions for function pointers to call NetAPI32 functions */

typedef

DWORD (WINAPI * NETSTATISTICSGET) (LPWSTR szServer, LPWSTR szService,

DWORD dwLevel, DWORD dwOptions,

LPBYTE * lpBuffer);

typedef

DWORD (WINAPI * NETAPIBUFFERSIZE) (LPVOID lpBuffer, LPDWORD cbBuffer);

typedef

DWORD (WINAPI * NETAPIBUFFERFREE) (LPVOID lpBuffer);

NETSTATISTICSGET pNetStatisticsGet = NULL;

NETAPIBUFFERSIZE pNetApiBufferSize = NULL;

NETAPIBUFFERFREE pNetApiBufferFree = NULL;

/* This is the slowpoll function which gathers up network/hard drive

performance data for the random pool */

BOOL SlowPoll (void)

{

static int isWorkstation = -1;

static int cbPerfData = 0x10000;

HANDLE hDevice;

LPBYTE lpBuffer;

DWORD dwSize, status;

LPWSTR lpszLanW, lpszLanS;

int nDrive;

/* Find out whether this is an NT server or workstation if necessary */

if (isWorkstation == -1)

{

HKEY hKey;

if (RegOpenKeyEx (HKEY_LOCAL_MACHINE,

L"SYSTEM\\CurrentControlSet\\Control\\ProductOptions",

0, KEY_READ, &hKey) == ERROR_SUCCESS)

{

wchar_t szValue[32];

dwSize = sizeof (szValue);

isWorkstation = TRUE;

status = RegQueryValueEx (hKey, L"ProductType", 0, NULL,

(LPBYTE) szValue, &dwSize);

if (status == ERROR_SUCCESS && _wcsicmp (szValue, L"WinNT"))

/* Note: There are (at least) three cases for

ProductType: WinNT = NT Workstation,

ServerNT = NT Server, LanmanNT = NT Server

acting as a Domain Controller */

isWorkstation = FALSE;

RegCloseKey (hKey);

}

}

/* Initialize the NetAPI32 function pointers if necessary */

if (hNetAPI32 == NULL)

{

/* Obtain a handle to the module containing the Lan Manager

functions */

wchar_t dllPath[MAX_PATH];

if (GetSystemDirectory (dllPath, MAX_PATH))

{

StringCchCatW(dllPath, ARRAYSIZE(dllPath), L"\\NETAPI32.DLL");

}

else

StringCchCopyW(dllPath, ARRAYSIZE(dllPath), L"C:\\Windows\\System32\\NETAPI32.DLL");

hNetAPI32 = LoadLibrary (dllPath);

if (hNetAPI32 != NULL)

{

/* Now get pointers to the functions */

pNetStatisticsGet = (NETSTATISTICSGET) GetProcAddress (hNetAPI32,

"NetStatisticsGet");

pNetApiBufferSize = (NETAPIBUFFERSIZE) GetProcAddress (hNetAPI32,

"NetApiBufferSize");

pNetApiBufferFree = (NETAPIBUFFERFREE) GetProcAddress (hNetAPI32,

"NetApiBufferFree");

/* Make sure we got valid pointers for every NetAPI32

function */

if (pNetStatisticsGet == NULL ||

pNetApiBufferSize == NULL ||

pNetApiBufferFree == NULL)

{

/* Free the library reference and reset the

static handle */

FreeLibrary (hNetAPI32);

hNetAPI32 = NULL;

}

}

}

/* Get network statistics. Note: Both NT Workstation and NT Server

by default will be running both the workstation and server

services. The heuristic below is probably useful though on the

assumption that the majority of the network traffic will be via

the appropriate service */

lpszLanW = (LPWSTR) WIDE ("LanmanWorkstation");

lpszLanS = (LPWSTR) WIDE ("LanmanServer");

if (hNetAPI32 &&

pNetStatisticsGet (NULL,

isWorkstation ? lpszLanW : lpszLanS,

0, 0, &lpBuffer) == 0)

{

pNetApiBufferSize (lpBuffer, &dwSize);

RandaddBuf ((unsigned char *) lpBuffer, dwSize);

pNetApiBufferFree (lpBuffer);

}

/* Get disk I/O statistics for all the hard drives */

for (nDrive = 0;; nDrive++)

{

DISK_PERFORMANCE diskPerformance;

wchar_t szDevice[24];

/* Check whether we can access this device */

StringCchPrintfW (szDevice, ARRAYSIZE(szDevice), L"\\\\.\\PhysicalDrive%d", nDrive);

hDevice = CreateFile (szDevice, 0, FILE_SHARE_READ | FILE_SHARE_WRITE,

NULL, OPEN_EXISTING, 0, NULL);

if (hDevice == INVALID_HANDLE_VALUE)

break;

/* Note: This only works if you have turned on the disk

performance counters with 'diskperf -y'. These counters

are off by default */

if (DeviceIoControl (hDevice, IOCTL_DISK_PERFORMANCE, NULL, 0,

&diskPerformance, sizeof (DISK_PERFORMANCE),

&dwSize, NULL))

{

RandaddBuf ((unsigned char *) &diskPerformance, dwSize);

}

CloseHandle (hDevice);

}

// CryptoAPI: We always have a valid CryptoAPI context when we arrive here but

// we keep the check for clarity purpose

if ( !CryptoAPIAvailable )

return FALSE;

if (CryptGenRandom (hCryptProv, sizeof (buffer), buffer))

{

RandaddBuf (buffer, sizeof (buffer));

}

else

{

/* return error in case CryptGenRandom fails */

CryptoAPILastError = GetLastError ();

return FALSE;

}

/* use JitterEntropy library to get good quality random bytes based on CPU timing jitter */

if (0 == jent_entropy_init ())

{

struct rand_data *ec = jent_entropy_collector_alloc (1, 0);

if (ec)

{

ssize_t rndLen = jent_read_entropy (ec, (char*) buffer, sizeof (buffer));

if (rndLen > 0)

RandaddBuf (buffer, (int) rndLen);

jent_entropy_collector_free (ec);

}

}

// use RDSEED or RDRAND from CPU as source of entropy if present

if ( IsCpuRngEnabled() &&

( (HasRDSEED() && RDSEED_getBytes (buffer, sizeof (buffer)))

|| (HasRDRAND() && RDRAND_getBytes (buffer, sizeof (buffer)))

))

{

RandaddBuf (buffer, sizeof (buffer));

}

burn(buffer, sizeof (buffer));

Randmix();

return TRUE;

}

/* This is the fastpoll function which gathers up info by calling various api's */

BOOL FastPoll (void)

{

int nOriginalRandIndex = nRandIndex;

static BOOL addedFixedItems = FALSE;

FILETIME creationTime, exitTime, kernelTime, userTime;

SIZE_T minimumWorkingSetSize, maximumWorkingSetSize;

LARGE_INTEGER performanceCount;

HANDLE handle;

POINT point;

/* Get various basic pieces of system information */

RandaddIntPtr (GetActiveWindow ()); /* Handle of active window */

RandaddIntPtr (GetCapture ()); /* Handle of window with mouse

capture */

RandaddIntPtr (GetClipboardOwner ()); /* Handle of clipboard owner */

RandaddIntPtr (GetClipboardViewer ()); /* Handle of start of

clpbd.viewer list */

RandaddIntPtr (GetCurrentProcess ()); /* Pseudohandle of current

process */

RandaddInt32 (GetCurrentProcessId ()); /* Current process ID */

RandaddIntPtr (GetCurrentThread ()); /* Pseudohandle of current

thread */

RandaddInt32 (GetCurrentThreadId ()); /* Current thread ID */

RandaddInt32 (GetCurrentTime ()); /* Milliseconds since Windows

started */

RandaddIntPtr (GetDesktopWindow ()); /* Handle of desktop window */

RandaddIntPtr (GetFocus ()); /* Handle of window with kb.focus */

RandaddInt32 (GetInputState ()); /* Whether sys.queue has any events */

RandaddInt32 (GetMessagePos ()); /* Cursor pos.for last message */

RandaddInt32 (GetMessageTime ()); /* 1 ms time for last message */

RandaddIntPtr (GetOpenClipboardWindow ()); /* Handle of window with

clpbd.open */

RandaddIntPtr (GetProcessHeap ()); /* Handle of process heap */

RandaddIntPtr (GetProcessWindowStation ()); /* Handle of procs

window station */

RandaddInt32 (GetQueueStatus (QS_ALLEVENTS)); /* Types of events in

input queue */

/* Get multiword system information */

GetCaretPos (&point); /* Current caret position */

RandaddBuf ((unsigned char *) &point, sizeof (POINT));

GetCursorPos (&point); /* Current mouse cursor position */

RandaddBuf ((unsigned char *) &point, sizeof (POINT));

/* Get percent of memory in use, bytes of physical memory, bytes of

free physical memory, bytes in paging file, free bytes in paging

file, user bytes of address space, and free user bytes */

GlobalMemoryStatusEx (&memoryStatus);

/* Get thread and process creation time, exit time, time in kernel

mode, and time in user mode in 100ns intervals */

handle = GetCurrentThread ();

GetThreadTimes (handle, &creationTime, &exitTime, &kernelTime, &userTime);

RandaddBuf ((unsigned char *) &creationTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &exitTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &kernelTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &userTime, sizeof (FILETIME));

handle = GetCurrentProcess ();

GetProcessTimes (handle, &creationTime, &exitTime, &kernelTime, &userTime);

RandaddBuf ((unsigned char *) &creationTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &exitTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &kernelTime, sizeof (FILETIME));

RandaddBuf ((unsigned char *) &userTime, sizeof (FILETIME));

/* Get the minimum and maximum working set size for the current

process */

GetProcessWorkingSetSize (handle, &minimumWorkingSetSize,

&maximumWorkingSetSize);

RandaddIntPtr (minimumWorkingSetSize);

RandaddIntPtr (maximumWorkingSetSize);

/* The following are fixed for the lifetime of the process so we only

add them once */

if (addedFixedItems == 0)

{

STARTUPINFO startupInfo;

/* Get name of desktop, console window title, new window

position and size, window flags, and handles for stdin,

stdout, and stderr */

startupInfo.cb = sizeof (STARTUPINFO);

GetStartupInfo (&startupInfo);

RandaddBuf ((unsigned char *) &startupInfo, sizeof (STARTUPINFO));

addedFixedItems = TRUE;

}

/* The docs say QPC can fail if appropriate hardware is not

available. It works on 486 & Pentium boxes, but hasn't been tested

for 386 or RISC boxes */

if (QueryPerformanceCounter (&performanceCount))

RandaddBuf ((unsigned char *) &performanceCount, sizeof (LARGE_INTEGER));

else

{

/* Millisecond accuracy at best... */

DWORD dwTicks = GetTickCount ();

RandaddBuf ((unsigned char *) &dwTicks, sizeof (dwTicks));

}

// CryptoAPI: We always have a valid CryptoAPI context when we arrive here but

// we keep the check for clarity purpose

if ( !CryptoAPIAvailable )

return FALSE;

if (CryptGenRandom (hCryptProv, sizeof (buffer), buffer))

{

RandaddBuf (buffer, sizeof (buffer));

}

else

{

/* return error in case CryptGenRandom fails */

CryptoAPILastError = GetLastError ();

return FALSE;

}

// use RDSEED or RDRAND from CPU as source of entropy if enabled

if ( IsCpuRngEnabled() &&

( (HasRDSEED() && RDSEED_getBytes (buffer, sizeof (buffer)))

|| (HasRDRAND() && RDRAND_getBytes (buffer, sizeof (buffer)))

))

{

RandaddBuf (buffer, sizeof (buffer));

}

burn (buffer, sizeof(buffer));

/* Apply the pool mixing function */

Randmix();

/* Restore the original pool cursor position. If this wasn't done, mouse coordinates

could be written to a limited area of the pool, especially when moving the mouse

uninterruptedly. The severity of the problem would depend on the length of data

written by FastPoll (if it was equal to the size of the pool, mouse coordinates

would be written only to a particular 4-byte area, whenever moving the mouse

uninterruptedly). */

nRandIndex = nOriginalRandIndex;

return TRUE;

}