VeraCrypt
aboutsummaryrefslogtreecommitdiff
path: root/src/Common/EncryptionThreadPool.c
blob: f93bf2696c2f7d24e89f936422153cf754d529ed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 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 "EncryptionThreadPool.h"
#include "Pkcs5.h"
#ifdef DEVICE_DRIVER
#include "Driver/Ntdriver.h"
#endif

//Increasing the maximum number of threads 
#define TC_ENC_THREAD_POOL_MAX_THREAD_COUNT 256 //64
#define TC_ENC_THREAD_POOL_QUEUE_SIZE (TC_ENC_THREAD_POOL_MAX_THREAD_COUNT * 2)

#define TC_ENC_THREAD_POOL_LEGACY_MAX_THREAD_COUNT 64
#define TC_ENC_THREAD_POOL_LEGACY_QUEUE_SIZE (TC_ENC_THREAD_POOL_LEGACY_MAX_THREAD_COUNT * 2)

static volatile size_t ThreadPoolCount = TC_ENC_THREAD_POOL_LEGACY_MAX_THREAD_COUNT;
static volatile int ThreadQueueSize = TC_ENC_THREAD_POOL_LEGACY_QUEUE_SIZE;

#ifdef DEVICE_DRIVER

#define TC_THREAD_HANDLE PKTHREAD
#define TC_THREAD_PROC VOID

#define TC_SET_EVENT(EVENT) KeSetEvent (&EVENT, IO_DISK_INCREMENT, FALSE)
#define TC_CLEAR_EVENT(EVENT) KeClearEvent (&EVENT)

#define TC_MUTEX FAST_MUTEX
#define TC_ACQUIRE_MUTEX(MUTEX) ExAcquireFastMutex (MUTEX)
#define TC_RELEASE_MUTEX(MUTEX) ExReleaseFastMutex (MUTEX)

#else // !DEVICE_DRIVER

#define TC_THREAD_HANDLE HANDLE
#define TC_THREAD_PROC unsigned __stdcall

#define TC_SET_EVENT(EVENT) SetEvent (EVENT)
#define TC_CLEAR_EVENT(EVENT) ResetEvent (EVENT)

#define TC_MUTEX HANDLE
#define TC_ACQUIRE_MUTEX(MUTEX) WaitForSingleObject (*(MUTEX), INFINITE)
#define TC_RELEASE_MUTEX(MUTEX) ReleaseMutex (*(MUTEX))

typedef BOOL (WINAPI *SetThreadGroupAffinityFn)(
  HANDLE               hThread,
  const GROUP_AFFINITY *GroupAffinity,
  PGROUP_AFFINITY      PreviousGroupAffinity
);

typedef WORD (WINAPI* GetActiveProcessorGroupCountFn)();

typedef DWORD (WINAPI *GetActiveProcessorCountFn)(
  WORD GroupNumber
);

#endif // !DEVICE_DRIVER


typedef enum
{
	WorkItemFree,
	WorkItemReady,
	WorkItemBusy
} WorkItemState;


typedef struct EncryptionThreadPoolWorkItemStruct
{
	WorkItemState State;
	EncryptionThreadPoolWorkType Type;

	TC_EVENT ItemCompletedEvent;

	struct EncryptionThreadPoolWorkItemStruct *FirstFragment;
	LONG OutstandingFragmentCount;

	union
	{
		struct
		{
			PCRYPTO_INFO CryptoInfo;
			byte *Data;
			UINT64_STRUCT StartUnitNo;
			uint32 UnitCount;

		} Encryption;

		struct
		{
			TC_EVENT *CompletionEvent;
			LONG *CompletionFlag;
			char *DerivedKey;
			int IterationCount;
			TC_EVENT *NoOutstandingWorkItemEvent;
			LONG *OutstandingWorkItemCount;
			CRYPTOPP_ALIGN_DATA(16) char Password[MAX_PASSWORD];
			int PasswordLength;
			int Pkcs5Prf;
			char Salt[PKCS5_SALT_SIZE];

		} KeyDerivation;

		struct
		{
			TC_EVENT *KeyDerivationCompletedEvent;
			TC_EVENT *NoOutstandingWorkItemEvent;
			LONG *outstandingWorkItemCount;
			void* keyDerivationWorkItems;
			int keyDerivationWorkItemsSize;

		} ReadVolumeHeaderFinalization;
	};

} EncryptionThreadPoolWorkItem;


static volatile BOOL ThreadPoolRunning = FALSE;
static volatile BOOL StopPending = FALSE;

static uint32 ThreadCount;
static TC_THREAD_HANDLE ThreadHandles[TC_ENC_THREAD_POOL_MAX_THREAD_COUNT];
static WORD ThreadProcessorGroups[TC_ENC_THREAD_POOL_MAX_THREAD_COUNT];

static EncryptionThreadPoolWorkItem WorkItemQueue[TC_ENC_THREAD_POOL_QUEUE_SIZE];

static volatile int EnqueuePosition;
static volatile int DequeuePosition;

static TC_MUTEX EnqueueMutex;
static TC_MUTEX DequeueMutex;

static TC_EVENT WorkItemReadyEvent;
static TC_EVENT WorkItemCompletedEvent;

#if defined(_WIN64)
void EncryptDataUnitsCurrentThreadEx (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
{
	if (IsRamEncryptionEnabled())
	{
		CRYPTO_INFO tmpCI;
		memcpy (&tmpCI, ci, sizeof (CRYPTO_INFO));
		VcUnprotectKeys (&tmpCI, VcGetEncryptionID (ci));

		EncryptDataUnitsCurrentThread (buf, structUnitNo, nbrUnits, &tmpCI);

		burn (&tmpCI, sizeof(CRYPTO_INFO));
	}
	else
		EncryptDataUnitsCurrentThread (buf, structUnitNo, nbrUnits, ci);
}

void DecryptDataUnitsCurrentThreadEx (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
{
	if (IsRamEncryptionEnabled())
	{
		CRYPTO_INFO tmpCI;
		memcpy (&tmpCI, ci, sizeof (CRYPTO_INFO));
		VcUnprotectKeys (&tmpCI, VcGetEncryptionID (ci));

		DecryptDataUnitsCurrentThread (buf, structUnitNo, nbrUnits, &tmpCI);

		burn (&tmpCI, sizeof(CRYPTO_INFO));
	}
	else
		DecryptDataUnitsCurrentThread (buf, structUnitNo, nbrUnits, ci);
}

#else
#define EncryptDataUnitsCurrentThreadEx EncryptDataUnitsCurrentThread
#define DecryptDataUnitsCurrentThreadEx DecryptDataUnitsCurrentThread
#endif

static WorkItemState GetWorkItemState (EncryptionThreadPoolWorkItem *workItem)
{
	return InterlockedExchangeAdd ((LONG *) &workItem->State, 0);
}


static void SetWorkItemState (EncryptionThreadPoolWorkItem *workItem, WorkItemState newState)
{
	InterlockedExchange ((LONG *) &workItem->State, (LONG) newState);
}


static TC_THREAD_PROC EncryptionThreadProc (void *threadArg)
{
	EncryptionThreadPoolWorkItem *workItem;
	if (threadArg)
	{
#ifdef DEVICE_DRIVER
		SetThreadCpuGroupAffinity ((USHORT) *(WORD*)(threadArg));
#else
		SetThreadGroupAffinityFn SetThreadGroupAffinityPtr = (SetThreadGroupAffinityFn) GetProcAddress (GetModuleHandle (L"kernel32.dll"), "SetThreadGroupAffinity");
		if (SetThreadGroupAffinityPtr && threadArg)
		{
			GROUP_AFFINITY groupAffinity = {0};
			groupAffinity.Mask = ~0ULL;
			groupAffinity.Group = *(WORD*)(threadArg);
			SetThreadGroupAffinityPtr(GetCurrentThread(), &groupAffinity, NULL);
		}
	
#endif
	}


	while (!StopPending)
	{
		TC_ACQUIRE_MUTEX (&DequeueMutex);

		workItem = &WorkItemQueue[DequeuePosition++];

		if (DequeuePosition >= ThreadQueueSize)
			DequeuePosition = 0;

		while (!StopPending && GetWorkItemState (workItem) != WorkItemReady)
		{
			TC_WAIT_EVENT (WorkItemReadyEvent);
		}

		SetWorkItemState (workItem, WorkItemBusy);

		TC_RELEASE_MUTEX (&DequeueMutex);

		if (StopPending)
			break;

		switch (workItem->Type)
		{
		case DecryptDataUnitsWork:
			DecryptDataUnitsCurrentThreadEx (workItem->Encryption.Data, &workItem->Encryption.StartUnitNo, workItem->Encryption.UnitCount, workItem->Encryption.CryptoInfo);
			break;

		case EncryptDataUnitsWork:
			EncryptDataUnitsCurrentThreadEx (workItem->Encryption.Data, &workItem->Encryption.StartUnitNo, workItem->Encryption.UnitCount, workItem->Encryption.CryptoInfo);
			break;

		case DeriveKeyWork:
			switch (workItem->KeyDerivation.Pkcs5Prf)
			{
			case RIPEMD160:
				derive_key_ripemd160 (workItem->KeyDerivation.Password, workItem->KeyDerivation.PasswordLength, workItem->KeyDerivation.Salt, PKCS5_SALT_SIZE,
					workItem->KeyDerivation.IterationCount, workItem->KeyDerivation.DerivedKey, GetMaxPkcs5OutSize());
				break;

			case SHA512:
				derive_key_sha512 (workItem->KeyDerivation.Password, workItem->KeyDerivation.PasswordLength, workItem->KeyDerivation.Salt, PKCS5_SALT_SIZE,
					workItem->KeyDerivation.IterationCount, workItem->KeyDerivation.DerivedKey, GetMaxPkcs5OutSize());
				break;

			case WHIRLPOOL:
				derive_key_whirlpool (workItem->KeyDerivation.Password, workItem->KeyDerivation.PasswordLength, workItem->KeyDerivation.Salt, PKCS5_SALT_SIZE,
					workItem->KeyDerivation.IterationCount, workItem->KeyDerivation.DerivedKey, GetMaxPkcs5OutSize());
				break;

			case SHA256:
				derive_key_sha256 (workItem->KeyDerivation.Password, workItem->KeyDerivation.PasswordLength, workItem->KeyDerivation.Salt, PKCS5_SALT_SIZE,
					workItem->KeyDerivation.IterationCount, workItem->KeyDerivation.DerivedKey, GetMaxPkcs5OutSize());
				break;

			case STREEBOG:
				derive_key_streebog(workItem->KeyDerivation.Password, workItem->KeyDerivation.PasswordLength, workItem->KeyDerivation.Salt, PKCS5_SALT_SIZE,
					workItem->KeyDerivation.IterationCount, workItem->KeyDerivation.DerivedKey, GetMaxPkcs5OutSize());
				break;

			default:
				TC_THROW_FATAL_EXCEPTION;
			}

#if !defined(DEVICE_DRIVER)
			burn (workItem->KeyDerivation.Password, sizeof(workItem->KeyDerivation.Password));
			burn (workItem->KeyDerivation.Salt, sizeof(workItem->KeyDerivation.Salt));
			VirtualUnlock (&workItem->KeyDerivation, sizeof (workItem->KeyDerivation));
#endif

			InterlockedExchange (workItem->KeyDerivation.CompletionFlag, TRUE);
			TC_SET_EVENT (*workItem->KeyDerivation.CompletionEvent);

			if (InterlockedDecrement (workItem->KeyDerivation.OutstandingWorkItemCount) == 0)
				TC_SET_EVENT (*workItem->KeyDerivation.NoOutstandingWorkItemEvent);

			SetWorkItemState (workItem, WorkItemFree);
			TC_SET_EVENT (WorkItemCompletedEvent);
			continue;

		case ReadVolumeHeaderFinalizationWork:
			TC_WAIT_EVENT (*(workItem->ReadVolumeHeaderFinalization.NoOutstandingWorkItemEvent));

			if (workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItems)
			{
				burn (workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItems, workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItemsSize);
				TCfree (workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItems);
			}

#if !defined(DEVICE_DRIVER) 
			CloseHandle (*(workItem->ReadVolumeHeaderFinalization.KeyDerivationCompletedEvent));
			CloseHandle (*(workItem->ReadVolumeHeaderFinalization.NoOutstandingWorkItemEvent));
#endif
			TCfree (workItem->ReadVolumeHeaderFinalization.KeyDerivationCompletedEvent);
			TCfree (workItem->ReadVolumeHeaderFinalization.NoOutstandingWorkItemEvent);
			TCfree (workItem->ReadVolumeHeaderFinalization.outstandingWorkItemCount);
			SetWorkItemState (workItem, WorkItemFree);
			TC_SET_EVENT (WorkItemCompletedEvent);
			continue;
		default:
			TC_THROW_FATAL_EXCEPTION;
		}

		if (workItem != workItem->FirstFragment)
		{
			SetWorkItemState (workItem, WorkItemFree);
			TC_SET_EVENT (WorkItemCompletedEvent);
		}

		if (InterlockedDecrement (&workItem->FirstFragment->OutstandingFragmentCount) == 0)
			TC_SET_EVENT (workItem->FirstFragment->ItemCompletedEvent);
	}

#ifdef DEVICE_DRIVER
	PsTerminateSystemThread (STATUS_SUCCESS);
#else
	_endthreadex (0);
    return 0;
#endif
}

#ifndef DEVICE_DRIVER

size_t GetCpuCount (WORD* pGroupCount)
{
	size_t cpuCount = 0;
	SYSTEM_INFO sysInfo;
	GetActiveProcessorGroupCountFn GetActiveProcessorGroupCountPtr = (GetActiveProcessorGroupCountFn) GetProcAddress (GetModuleHandle (L"Kernel32.dll"), "GetActiveProcessorGroupCount");
	GetActiveProcessorCountFn GetActiveProcessorCountPtr = (GetActiveProcessorCountFn) GetProcAddress (GetModuleHandle (L"Kernel32.dll"), "GetActiveProcessorCount");
	if (GetActiveProcessorGroupCountPtr && GetActiveProcessorCountPtr)
	{
		WORD j, groupCount = GetActiveProcessorGroupCountPtr();
		size_t totalProcessors = 0;
		for (j = 0; j < groupCount; ++j)
		{
			totalProcessors += (size_t) GetActiveProcessorCountPtr(j);
		}
		cpuCount = totalProcessors;
		if (pGroupCount)
			*pGroupCount = groupCount;
	}
	else
	{
		GetSystemInfo(&sysInfo);
		cpuCount = (size_t) sysInfo.dwNumberOfProcessors;
		if (pGroupCount)
			*pGroupCount = 1;
	}

	return cpuCount;
}

#endif


BOOL EncryptionThreadPoolStart (size_t encryptionFreeCpuCount)
{
	size_t cpuCount = 0, i = 0;
	WORD groupCount = 1;

	cpuCount = GetCpuCount(&groupCount);

	if (ThreadPoolRunning)
		return TRUE;

	if (groupCount > 1)
	{
		ThreadPoolCount = TC_ENC_THREAD_POOL_MAX_THREAD_COUNT;
		ThreadQueueSize = TC_ENC_THREAD_POOL_QUEUE_SIZE;
	}

	if (cpuCount > encryptionFreeCpuCount)
		cpuCount -= encryptionFreeCpuCount;

	if (cpuCount < 2)
		return TRUE;

	if (cpuCount > ThreadPoolCount)
		cpuCount = ThreadPoolCount;

	StopPending = FALSE;
	DequeuePosition = 0;
	EnqueuePosition = 0;

#ifdef DEVICE_DRIVER
	KeInitializeEvent (&WorkItemReadyEvent, SynchronizationEvent, FALSE);
	KeInitializeEvent (&WorkItemCompletedEvent, SynchronizationEvent, FALSE);
#else
	WorkItemReadyEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
	if (!WorkItemReadyEvent)
		return FALSE;

	WorkItemCompletedEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
	if (!WorkItemCompletedEvent)
		return FALSE;
#endif

#ifdef DEVICE_DRIVER
	ExInitializeFastMutex (&DequeueMutex);
	ExInitializeFastMutex (&EnqueueMutex);
#else
	DequeueMutex = CreateMutex (NULL, FALSE, NULL);
	if (!DequeueMutex)
		return FALSE;

	EnqueueMutex = CreateMutex (NULL, FALSE, NULL);
	if (!EnqueueMutex)
		return FALSE;
#endif

	memset (WorkItemQueue, 0, sizeof (WorkItemQueue));

	for (i = 0; i < sizeof (WorkItemQueue) / sizeof (WorkItemQueue[0]); ++i)
	{
		WorkItemQueue[i].State = WorkItemFree;

#ifdef DEVICE_DRIVER
		KeInitializeEvent (&WorkItemQueue[i].ItemCompletedEvent, SynchronizationEvent, FALSE);
#else
		WorkItemQueue[i].ItemCompletedEvent = CreateEvent (NULL, FALSE, FALSE, NULL);
		if (!WorkItemQueue[i].ItemCompletedEvent)
		{
			EncryptionThreadPoolStop();
			return FALSE;
		}
#endif
	}

	for (ThreadCount = 0; ThreadCount < cpuCount; ++ThreadCount)
	{
		WORD* pThreadArg = NULL;
		if (groupCount > 1)
		{
#ifdef DEVICE_DRIVER
			ThreadProcessorGroups[ThreadCount] = GetCpuGroup ((size_t) ThreadCount);
#else
			GetActiveProcessorCountFn GetActiveProcessorCountPtr = (GetActiveProcessorCountFn) GetProcAddress (GetModuleHandle (L"Kernel32.dll"), "GetActiveProcessorCount");
			// Determine which processor group to bind the thread to.
			if (GetActiveProcessorCountPtr)
			{
				WORD j;
				uint32 totalProcessors = 0U;
				for (j = 0U; j < groupCount; j++)
				{
					totalProcessors += (uint32) GetActiveProcessorCountPtr(j);
					if (totalProcessors >= ThreadCount)
					{
						ThreadProcessorGroups[ThreadCount] = j;
						break;
					}
				}
			}
			else
				ThreadProcessorGroups[ThreadCount] = 0;
#endif
			pThreadArg = &ThreadProcessorGroups[ThreadCount];
		}

#ifdef DEVICE_DRIVER
		if (!NT_SUCCESS(TCStartThread(EncryptionThreadProc, (void*) pThreadArg, &ThreadHandles[ThreadCount])))
#else
		if (!(ThreadHandles[ThreadCount] = (HANDLE)_beginthreadex(NULL, 0, EncryptionThreadProc, (void*) pThreadArg, 0, NULL)))
#endif

		{
			EncryptionThreadPoolStop();
			return FALSE;
		}
	}

	ThreadPoolRunning = TRUE;
	return TRUE;
}


void EncryptionThreadPoolStop ()
{
	size_t i;

	if (!ThreadPoolRunning)
		return;

	StopPending = TRUE;
	TC_SET_EVENT (WorkItemReadyEvent);

	for (i = 0; i < ThreadCount; ++i)
	{
#ifdef DEVICE_DRIVER
		TCStopThread (ThreadHandles[i], &WorkItemReadyEvent);
#else
		TC_WAIT_EVENT (ThreadHandles[i]);
#endif
	}

	ThreadCount = 0;

#ifndef DEVICE_DRIVER
	CloseHandle (DequeueMutex);
	CloseHandle (EnqueueMutex);

	CloseHandle (WorkItemReadyEvent);
	CloseHandle (WorkItemCompletedEvent);

	for (i = 0; i < sizeof (WorkItemQueue) / sizeof (WorkItemQueue[0]); ++i)
	{
#if !defined(DEVICE_DRIVER)
		if (WorkItemQueue[i].Type == DeriveKeyWork)
		{
			burn (WorkItemQueue[i].KeyDerivation.Password, sizeof(WorkItemQueue[i].KeyDerivation.Password));
			burn (WorkItemQueue[i].KeyDerivation.Salt, sizeof(WorkItemQueue[i].KeyDerivation.Salt));
			VirtualUnlock (&WorkItemQueue[i].KeyDerivation, sizeof (WorkItemQueue[i].KeyDerivation));
		}
#endif
		if (WorkItemQueue[i].ItemCompletedEvent)
			CloseHandle (WorkItemQueue[i].ItemCompletedEvent);
	}
#endif

	ThreadPoolRunning = FALSE;
}


void EncryptionThreadPoolBeginKeyDerivation (TC_EVENT *completionEvent, TC_EVENT *noOutstandingWorkItemEvent, LONG *completionFlag, LONG *outstandingWorkItemCount, int pkcs5Prf, char *password, int passwordLength, char *salt, int iterationCount, char *derivedKey)
{
	EncryptionThreadPoolWorkItem *workItem;

	if (!ThreadPoolRunning)
		TC_THROW_FATAL_EXCEPTION;

	TC_ACQUIRE_MUTEX (&EnqueueMutex);

	workItem = &WorkItemQueue[EnqueuePosition++];
	if (EnqueuePosition >= ThreadQueueSize)
		EnqueuePosition = 0;

	while (GetWorkItemState (workItem) != WorkItemFree)
	{
		TC_WAIT_EVENT (WorkItemCompletedEvent);
	}

	workItem->Type = DeriveKeyWork;
#if !defined(DEVICE_DRIVER)
	VirtualLock (&workItem->KeyDerivation, sizeof (workItem->KeyDerivation));
#endif
	workItem->KeyDerivation.CompletionEvent = completionEvent;
	workItem->KeyDerivation.CompletionFlag = completionFlag;
	workItem->KeyDerivation.DerivedKey = derivedKey;
	workItem->KeyDerivation.IterationCount = iterationCount;
	workItem->KeyDerivation.NoOutstandingWorkItemEvent = noOutstandingWorkItemEvent;
	workItem->KeyDerivation.OutstandingWorkItemCount = outstandingWorkItemCount;
	memcpy (workItem->KeyDerivation.Password, password, passwordLength);
	workItem->KeyDerivation.PasswordLength = passwordLength;
	workItem->KeyDerivation.Pkcs5Prf = pkcs5Prf;
	memcpy (workItem->KeyDerivation.Salt, salt, PKCS5_SALT_SIZE);

	InterlockedIncrement (outstandingWorkItemCount);
	TC_CLEAR_EVENT (*noOutstandingWorkItemEvent);

	SetWorkItemState (workItem, WorkItemReady);
	TC_SET_EVENT (WorkItemReadyEvent);
	TC_RELEASE_MUTEX (&EnqueueMutex);
}

void EncryptionThreadPoolBeginReadVolumeHeaderFinalization (TC_EVENT *keyDerivationCompletedEvent, TC_EVENT *noOutstandingWorkItemEvent, LONG* outstandingWorkItemCount, void* keyDerivationWorkItems, int keyDerivationWorkItemsSize)
{
	EncryptionThreadPoolWorkItem *workItem;

	if (!ThreadPoolRunning)
		TC_THROW_FATAL_EXCEPTION;

	TC_ACQUIRE_MUTEX (&EnqueueMutex);

	workItem = &WorkItemQueue[EnqueuePosition++];
	if (EnqueuePosition >= ThreadQueueSize)
		EnqueuePosition = 0;

	while (GetWorkItemState (workItem) != WorkItemFree)
	{
		TC_WAIT_EVENT (WorkItemCompletedEvent);
	}

	workItem->Type = ReadVolumeHeaderFinalizationWork;
	workItem->ReadVolumeHeaderFinalization.NoOutstandingWorkItemEvent = noOutstandingWorkItemEvent;
	workItem->ReadVolumeHeaderFinalization.KeyDerivationCompletedEvent = keyDerivationCompletedEvent;
	workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItems = keyDerivationWorkItems;
	workItem->ReadVolumeHeaderFinalization.keyDerivationWorkItemsSize = keyDerivationWorkItemsSize;
	workItem->ReadVolumeHeaderFinalization.outstandingWorkItemCount = outstandingWorkItemCount;

	SetWorkItemState (workItem, WorkItemReady);
	TC_SET_EVENT (WorkItemReadyEvent);
	TC_RELEASE_MUTEX (&EnqueueMutex);
}


void EncryptionThreadPoolDoWork (EncryptionThreadPoolWorkType type, byte *data, const UINT64_STRUCT *startUnitNo, uint32 unitCount, PCRYPTO_INFO cryptoInfo)
{
	uint32 fragmentCount;
	uint32 unitsPerFragment;
	uint32 remainder;

	byte *fragmentData;
	uint64 fragmentStartUnitNo;

	EncryptionThreadPoolWorkItem *workItem;
	EncryptionThreadPoolWorkItem *firstFragmentWorkItem;

	if (unitCount == 0)
		return;

	if (!ThreadPoolRunning || unitCount == 1)
	{
		switch (type)
		{
		case DecryptDataUnitsWork:
			DecryptDataUnitsCurrentThreadEx (data, startUnitNo, unitCount, cryptoInfo);
			break;

		case EncryptDataUnitsWork:
			EncryptDataUnitsCurrentThreadEx (data, startUnitNo, unitCount, cryptoInfo);
			break;

		default:
			TC_THROW_FATAL_EXCEPTION;
		}

		return;
	}

	if (unitCount <= ThreadCount)
	{
		fragmentCount = unitCount;
		unitsPerFragment = 1;
		remainder = 0;
	}
	else
	{
		/* Note that it is not efficient to divide the data into fragments smaller than a few hundred bytes.
		The reason is that the overhead associated with thread handling would in most cases make a multi-threaded
		process actually slower than a single-threaded process. */

		fragmentCount = ThreadCount;
		unitsPerFragment = unitCount / ThreadCount;
		remainder = unitCount % ThreadCount;

		if (remainder > 0)
			++unitsPerFragment;
	}

	fragmentData = data;
	fragmentStartUnitNo = startUnitNo->Value;

	TC_ACQUIRE_MUTEX (&EnqueueMutex);
	firstFragmentWorkItem = &WorkItemQueue[EnqueuePosition];

	while (GetWorkItemState (firstFragmentWorkItem) != WorkItemFree)
	{
		TC_WAIT_EVENT (WorkItemCompletedEvent);
	}

	firstFragmentWorkItem->OutstandingFragmentCount = fragmentCount;

	while (fragmentCount-- > 0)
	{
		workItem = &WorkItemQueue[EnqueuePosition++];
		if (EnqueuePosition >= ThreadQueueSize)
			EnqueuePosition = 0;

		while (GetWorkItemState (workItem) != WorkItemFree)
		{
			TC_WAIT_EVENT (WorkItemCompletedEvent);
		}

		workItem->Type = type;
		workItem->FirstFragment = firstFragmentWorkItem;

		workItem->Encryption.CryptoInfo = cryptoInfo;
		workItem->Encryption.Data = fragmentData;
		workItem->Encryption.UnitCount = unitsPerFragment;
		workItem->Encryption.StartUnitNo.Value = fragmentStartUnitNo;

		fragmentData += unitsPerFragment * ENCRYPTION_DATA_UNIT_SIZE;
		fragmentStartUnitNo += unitsPerFragment;

		if (remainder > 0 && --remainder == 0)
			--unitsPerFragment;

		SetWorkItemState (workItem, WorkItemReady);
		TC_SET_EVENT (WorkItemReadyEvent);
	}

	TC_RELEASE_MUTEX (&EnqueueMutex);

	TC_WAIT_EVENT (firstFragmentWorkItem->ItemCompletedEvent);
	SetWorkItemState (firstFragmentWorkItem, WorkItemFree);
	TC_SET_EVENT (WorkItemCompletedEvent);
}


size_t GetEncryptionThreadCount ()
{
	return ThreadPoolRunning ? ThreadCount : 0;
}


size_t GetMaxEncryptionThreadCount ()
{
	return ThreadPoolCount;
}


BOOL IsEncryptionThreadPoolRunning ()
{
	return ThreadPoolRunning;
}