/*
 Legal Notice: Some portions of the source code contained in this file were
 derived 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) 2003-2010 TrueCrypt Developers Association
 and are governed by the TrueCrypt License 3.0 the full text of which is
 contained in the file License.txt included in TrueCrypt binary and source
 code distribution packages. */

#include "Tcdefs.h"
#include "Crypto.h"
#include "Xts.h"
#include "Crc.h"
#include "Common/Endian.h"
#include <string.h>
#ifndef TC_WINDOWS_BOOT
#include "EncryptionThreadPool.h"
#endif
#include "Volumes.h"

/* Update the following when adding a new cipher or EA:

   Crypto.h:
     ID #define
     MAX_EXPANDED_KEY #define

   Crypto.c:
     Ciphers[]
     EncryptionAlgorithms[]
     CipherInit()
     EncipherBlock()
     DecipherBlock()

*/

#ifndef TC_WINDOWS_BOOT_SINGLE_CIPHER_MODE

// Cipher configuration
static Cipher Ciphers[] =
{
//								Block Size	Key Size	Key Schedule Size
//	  ID		Name			(Bytes)		(Bytes)		(Bytes)
	{ AES,		"AES",			16,			32,			AES_KS				},
	{ SERPENT,	"Serpent",		16,			32,			140*4				},
	{ TWOFISH,	"Twofish",		16,			32,			TWOFISH_KS			},
#ifndef TC_WINDOWS_BOOT
	{ BLOWFISH,	"Blowfish",		8,			56,			sizeof (BF_KEY)		},	// Deprecated/legacy
	{ CAST,		"CAST5",		8,			16,			sizeof (CAST_KEY)	},	// Deprecated/legacy
	{ TRIPLEDES,"Triple DES",	8,			8*3,		sizeof (TDES_KEY)	},	// Deprecated/legacy
#endif
	{ 0,		0,				0,			0,			0					}
};


// Encryption algorithm configuration
// The following modes have been deprecated (legacy): LRW, CBC, INNER_CBC, OUTER_CBC
static EncryptionAlgorithm EncryptionAlgorithms[] =
{
	//  Cipher(s)                     Modes						FormatEnabled

#ifndef TC_WINDOWS_BOOT

	{ { 0,						0 }, { 0, 0, 0, 0 },				0 },	// Must be all-zero
	{ { AES,					0 }, { XTS, LRW, CBC, 0 },			1 },
	{ { SERPENT,				0 }, { XTS, LRW, CBC, 0 },			1 },
	{ { TWOFISH,				0 }, { XTS, LRW, CBC, 0 },			1 },
	{ { TWOFISH, AES,			0 }, { XTS, LRW, OUTER_CBC, 0 },	1 },
	{ { SERPENT, TWOFISH, AES,	0 }, { XTS, LRW, OUTER_CBC, 0 },	1 },
	{ { AES, SERPENT,			0 }, { XTS, LRW, OUTER_CBC, 0 },	1 },
	{ { AES, TWOFISH, SERPENT,	0 }, { XTS, LRW, OUTER_CBC, 0 },	1 },
	{ { SERPENT, TWOFISH,		0 }, { XTS, LRW, OUTER_CBC, 0 },	1 },
	{ { BLOWFISH,				0 }, { LRW, CBC, 0, 0 },			0 },	// Deprecated/legacy
	{ { CAST,					0 }, { LRW, CBC, 0, 0 },			0 },	// Deprecated/legacy
	{ { TRIPLEDES,				0 }, { LRW, CBC, 0, 0 },			0 },	// Deprecated/legacy
	{ { BLOWFISH, AES,			0 }, { INNER_CBC, 0, 0, 0 },		0 },	// Deprecated/legacy
	{ { SERPENT, BLOWFISH, AES,	0 }, { INNER_CBC, 0, 0, 0 },		0 },	// Deprecated/legacy
	{ { 0,						0 }, { 0, 0, 0, 0 },				0 }		// Must be all-zero

#else // TC_WINDOWS_BOOT

	// Encryption algorithms available for boot drive encryption
	{ { 0,						0 }, { 0, 0 },		0 },	// Must be all-zero
	{ { AES,					0 }, { XTS, 0 },	1 },
	{ { SERPENT,				0 }, { XTS, 0 },	1 },
	{ { TWOFISH,				0 }, { XTS, 0 },	1 },
	{ { TWOFISH, AES,			0 }, { XTS, 0 },	1 },
	{ { SERPENT, TWOFISH, AES,	0 }, { XTS, 0 },	1 },
	{ { AES, SERPENT,			0 }, { XTS, 0 },	1 },
	{ { AES, TWOFISH, SERPENT,	0 }, { XTS, 0 },	1 },
	{ { SERPENT, TWOFISH,		0 }, { XTS, 0 },	1 },
	{ { 0,						0 }, { 0, 0 },		0 },	// Must be all-zero

#endif

};



// Hash algorithms
static Hash Hashes[] =
{	// ID			Name			Deprecated		System Encryption
	{ RIPEMD160,	"RIPEMD-160",	FALSE,			TRUE },
#ifndef TC_WINDOWS_BOOT
	{ SHA512,		"SHA-512",		FALSE,			FALSE },
	{ WHIRLPOOL,	"Whirlpool",	FALSE,			FALSE },
	{ SHA1,			"SHA-1",		TRUE,			FALSE },	// Deprecated/legacy
#endif
	{ 0, 0, 0 }
};

/* Return values: 0 = success, ERR_CIPHER_INIT_FAILURE (fatal), ERR_CIPHER_INIT_WEAK_KEY (non-fatal) */
int CipherInit (int cipher, unsigned char *key, unsigned __int8 *ks)
{
	int retVal = ERR_SUCCESS;

	switch (cipher)
	{
	case AES:
#ifndef TC_WINDOWS_BOOT
		if (aes_encrypt_key256 (key, (aes_encrypt_ctx *) ks) != EXIT_SUCCESS)
			return ERR_CIPHER_INIT_FAILURE;

		if (aes_decrypt_key256 (key, (aes_decrypt_ctx *) (ks + sizeof(aes_encrypt_ctx))) != EXIT_SUCCESS)
			return ERR_CIPHER_INIT_FAILURE;
#else
		if (aes_set_key (key, (length_type) CipherGetKeySize(AES), (aes_context *) ks) != 0)
			return ERR_CIPHER_INIT_FAILURE;
#endif
		break;

	case SERPENT:
		serpent_set_key (key, CipherGetKeySize(SERPENT) * 8, ks);
		break;
		
	case TWOFISH:
		twofish_set_key ((TwofishInstance *)ks, (const u4byte *)key, CipherGetKeySize(TWOFISH) * 8);
		break;

#ifndef TC_WINDOWS_BOOT
		
	case BLOWFISH:
		/* Deprecated/legacy */
		BlowfishSetKey ((BF_KEY *)ks, CipherGetKeySize(BLOWFISH), key);
		break;

	case CAST:
		/* Deprecated/legacy */
		Cast5SetKey ((CAST_KEY *) ks, CipherGetKeySize(CAST), key);
		break;

	case TRIPLEDES:
		/* Deprecated/legacy */
		TripleDesSetKey (key, CipherGetKeySize (TRIPLEDES), (TDES_KEY *) ks);

		// Verify whether all three DES keys are mutually different
		if (((*((__int64 *) key) ^ *((__int64 *) key+1)) & 0xFEFEFEFEFEFEFEFEULL) == 0
		|| ((*((__int64 *) key+1) ^ *((__int64 *) key+2)) & 0xFEFEFEFEFEFEFEFEULL) == 0
		|| ((*((__int64 *) key) ^ *((__int64 *) key+2)) & 0xFEFEFEFEFEFEFEFEULL) == 0)
			retVal = ERR_CIPHER_INIT_WEAK_KEY;		// Non-fatal error

		break;

#endif	// TC_WINDOWS_BOOT

	default:
		// Unknown/wrong cipher ID
		return ERR_CIPHER_INIT_FAILURE;
	}

	return retVal;
}

void EncipherBlock(int cipher, void *data, void *ks)
{
	switch (cipher)
	{
	case AES:	
		// In 32-bit kernel mode, due to KeSaveFloatingPointState() overhead, AES instructions can be used only when processing the whole data unit.
#if (defined (_WIN64) || !defined (TC_WINDOWS_DRIVER)) && !defined (TC_WINDOWS_BOOT)
		if (IsAesHwCpuSupported())
			aes_hw_cpu_encrypt (ks, data);
		else
#endif
			aes_encrypt (data, data, ks);
		break;

	case TWOFISH:		twofish_encrypt (ks, data, data); break;
	case SERPENT:		serpent_encrypt (data, data, ks); break;
#ifndef TC_WINDOWS_BOOT
	case BLOWFISH:		BlowfishEncryptLE (data, data, ks, 1); break;	// Deprecated/legacy
	case CAST:			Cast5Encrypt (data, data, ks); break;			// Deprecated/legacy
	case TRIPLEDES:		TripleDesEncrypt (data, data, ks, 1); break;	// Deprecated/legacy
#endif
	default:			TC_THROW_FATAL_EXCEPTION;	// Unknown/wrong ID
	}
}

#ifndef TC_WINDOWS_BOOT

void EncipherBlocks (int cipher, void *dataPtr, void *ks, size_t blockCount)
{
	byte *data = dataPtr;
#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
	KFLOATING_SAVE floatingPointState;
#endif

	if (cipher == AES
		&& (blockCount & (32 - 1)) == 0
		&& IsAesHwCpuSupported()
#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
		&& NT_SUCCESS (KeSaveFloatingPointState (&floatingPointState))
#endif
		)
	{
		while (blockCount > 0)
		{
			aes_hw_cpu_encrypt_32_blocks (ks, data);

			data += 32 * 16;
			blockCount -= 32;
		}

#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
		KeRestoreFloatingPointState (&floatingPointState);
#endif
	}
	else
	{
		size_t blockSize = CipherGetBlockSize (cipher);
		while (blockCount-- > 0)
		{
			EncipherBlock (cipher, data, ks);
			data += blockSize;
		}
	}
}

#endif // !TC_WINDOWS_BOOT

void DecipherBlock(int cipher, void *data, void *ks)
{
	switch (cipher)
	{
	case SERPENT:	serpent_decrypt (data, data, ks); break;
	case TWOFISH:	twofish_decrypt (ks, data, data); break;
#ifndef TC_WINDOWS_BOOT

	case AES:
#if defined (_WIN64) || !defined (TC_WINDOWS_DRIVER)
		if (IsAesHwCpuSupported())
			aes_hw_cpu_decrypt ((byte *) ks + sizeof (aes_encrypt_ctx), data);
		else
#endif
			aes_decrypt (data, data, (void *) ((char *) ks + sizeof(aes_encrypt_ctx)));
		break;

	case BLOWFISH:	BlowfishEncryptLE (data, data, ks, 0); break;	// Deprecated/legacy
	case CAST:		Cast5Decrypt (data, data, ks); break;			// Deprecated/legacy
	case TRIPLEDES:	TripleDesEncrypt (data, data, ks, 0); break;	// Deprecated/legacy
#else
	case AES:		aes_decrypt (data, data, ks); break;
#endif
	default:		TC_THROW_FATAL_EXCEPTION;	// Unknown/wrong ID
	}
}

#ifndef TC_WINDOWS_BOOT

void DecipherBlocks (int cipher, void *dataPtr, void *ks, size_t blockCount)
{
	byte *data = dataPtr;
#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
	KFLOATING_SAVE floatingPointState;
#endif

	if (cipher == AES
		&& (blockCount & (32 - 1)) == 0
		&& IsAesHwCpuSupported()
#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
		&& NT_SUCCESS (KeSaveFloatingPointState (&floatingPointState))
#endif
		)
	{
		while (blockCount > 0)
		{
			aes_hw_cpu_decrypt_32_blocks ((byte *) ks + sizeof (aes_encrypt_ctx), data);

			data += 32 * 16;
			blockCount -= 32;
		}

#if defined (TC_WINDOWS_DRIVER) && !defined (_WIN64)
		KeRestoreFloatingPointState (&floatingPointState);
#endif
	}
	else
	{
		size_t blockSize = CipherGetBlockSize (cipher);
		while (blockCount-- > 0)
		{
			DecipherBlock (cipher, data, ks);
			data += blockSize;
		}
	}
}

#endif // !TC_WINDOWS_BOOT


// Ciphers support

Cipher *CipherGet (int id)
{
	int i;
	for (i = 0; Ciphers[i].Id != 0; i++)
		if (Ciphers[i].Id == id)
			return &Ciphers[i];

	return NULL;
}

char *CipherGetName (int cipherId)
{
	return CipherGet (cipherId) -> Name;
}

int CipherGetBlockSize (int cipherId)
{
	return CipherGet (cipherId) -> BlockSize;
}

int CipherGetKeySize (int cipherId)
{
	return CipherGet (cipherId) -> KeySize;
}

int CipherGetKeyScheduleSize (int cipherId)
{
	return CipherGet (cipherId) -> KeyScheduleSize;
}

#ifndef TC_WINDOWS_BOOT

BOOL CipherSupportsIntraDataUnitParallelization (int cipher)
{
	return cipher == AES && IsAesHwCpuSupported();
}

#endif


// Encryption algorithms support

int EAGetFirst ()
{
	return 1;
}

// Returns number of EAs
int EAGetCount (void)
{
	int ea, count = 0;

	for (ea = EAGetFirst (); ea != 0; ea = EAGetNext (ea))
	{
		count++;
	}
	return count;
}

int EAGetNext (int previousEA)
{
	int id = previousEA + 1;
	if (EncryptionAlgorithms[id].Ciphers[0] != 0) return id;
	return 0;
}


// Return values: 0 = success, ERR_CIPHER_INIT_FAILURE (fatal), ERR_CIPHER_INIT_WEAK_KEY (non-fatal)
int EAInit (int ea, unsigned char *key, unsigned __int8 *ks)
{
	int c, retVal = ERR_SUCCESS;

	if (ea == 0)
		return ERR_CIPHER_INIT_FAILURE;

	for (c = EAGetFirstCipher (ea); c != 0; c = EAGetNextCipher (ea, c))
	{
		switch (CipherInit (c, key, ks))
		{
		case ERR_CIPHER_INIT_FAILURE:
			return ERR_CIPHER_INIT_FAILURE;

		case ERR_CIPHER_INIT_WEAK_KEY:
			retVal = ERR_CIPHER_INIT_WEAK_KEY;		// Non-fatal error
			break;
		}

		key += CipherGetKeySize (c);
		ks += CipherGetKeyScheduleSize (c);
	}
	return retVal;
}


#ifndef TC_WINDOWS_BOOT

BOOL EAInitMode (PCRYPTO_INFO ci)
{
	switch (ci->mode)
	{
	case XTS:
		// Secondary key schedule
		if (EAInit (ci->ea, ci->k2, ci->ks2) != ERR_SUCCESS)
			return FALSE;

		/* Note: XTS mode could potentially be initialized with a weak key causing all blocks in one data unit
		on the volume to be tweaked with zero tweaks (i.e. 512 bytes of the volume would be encrypted in ECB
		mode). However, to create a TrueCrypt volume with such a weak key, each human being on Earth would have
		to create approximately 11,378,125,361,078,862 (about eleven quadrillion) TrueCrypt volumes (provided 
		that the size of each of the volumes is 1024 terabytes). */
		break;

	case LRW:
		switch (CipherGetBlockSize (EAGetFirstCipher (ci->ea)))
		{
		case 8:
			/* Deprecated/legacy */
			return Gf64TabInit (ci->k2, &ci->gf_ctx);

		case 16:
			return Gf128Tab64Init (ci->k2, &ci->gf_ctx);

		default:
			TC_THROW_FATAL_EXCEPTION;
		}

		break;

	case CBC:
	case INNER_CBC:
	case OUTER_CBC:
		// The mode does not need to be initialized or is initialized elsewhere 
		return TRUE;

	default:		
		// Unknown/wrong ID
		TC_THROW_FATAL_EXCEPTION;
	}
	return TRUE;
}


// Returns name of EA, cascaded cipher names are separated by hyphens
char *EAGetName (char *buf, int ea)
{
	int i = EAGetLastCipher(ea);
	strcpy (buf, (i != 0) ? CipherGetName (i) : "?");

	while (i = EAGetPreviousCipher(ea, i))
	{
		strcat (buf, "-");
		strcat (buf, CipherGetName (i));
	}

	return buf;
}


int EAGetByName (char *name)
{
	int ea = EAGetFirst ();
	char n[128];

	do
	{
		EAGetName (n, ea);
		if (strcmp (n, name) == 0)
			return ea;
	}
	while (ea = EAGetNext (ea));

	return 0;
}

#endif // TC_WINDOWS_BOOT

// Returns sum of key sizes of all ciphers of the EA (in bytes)
int EAGetKeySize (int ea)
{
	int i = EAGetFirstCipher (ea);
	int size = CipherGetKeySize (i);

	while (i = EAGetNextCipher (ea, i))
	{
		size += CipherGetKeySize (i);
	}

	return size;
}


// Returns the first mode of operation of EA
int EAGetFirstMode (int ea)
{
	return (EncryptionAlgorithms[ea].Modes[0]);
}


int EAGetNextMode (int ea, int previousModeId)
{
	int c, i = 0;
	while (c = EncryptionAlgorithms[ea].Modes[i++])
	{
		if (c == previousModeId) 
			return EncryptionAlgorithms[ea].Modes[i];
	}

	return 0;
}


#ifndef TC_WINDOWS_BOOT

// Returns the name of the mode of operation of the whole EA
char *EAGetModeName (int ea, int mode, BOOL capitalLetters)
{
	switch (mode)
	{
	case XTS:

		return "XTS";

	case LRW:

		/* Deprecated/legacy */

		return "LRW";

	case CBC:
		{
			/* Deprecated/legacy */

			char eaName[100];
			EAGetName (eaName, ea);

			if (strcmp (eaName, "Triple DES") == 0)
				return capitalLetters ? "Outer-CBC" : "outer-CBC";

			return "CBC";
		}

	case OUTER_CBC:

		/* Deprecated/legacy */

		return  capitalLetters ? "Outer-CBC" : "outer-CBC";

	case INNER_CBC:

		/* Deprecated/legacy */

		return capitalLetters ? "Inner-CBC" : "inner-CBC";

	}
	return "[unknown]";
}

#endif // TC_WINDOWS_BOOT


// Returns sum of key schedule sizes of all ciphers of the EA
int EAGetKeyScheduleSize (int ea)
{
	int i = EAGetFirstCipher(ea);
	int size = CipherGetKeyScheduleSize (i);

	while (i = EAGetNextCipher(ea, i))
	{
		size += CipherGetKeyScheduleSize (i);
	}

	return size;
}


// Returns the largest key size needed by an EA for the specified mode of operation
int EAGetLargestKeyForMode (int mode)
{
	int ea, key = 0;

	for (ea = EAGetFirst (); ea != 0; ea = EAGetNext (ea))
	{
		if (!EAIsModeSupported (ea, mode))
			continue;

		if (EAGetKeySize (ea) >= key)
			key = EAGetKeySize (ea);
	}
	return key;
}


// Returns the largest key needed by any EA for any mode
int EAGetLargestKey ()
{
	int ea, key = 0;

	for (ea = EAGetFirst (); ea != 0; ea = EAGetNext (ea))
	{
		if (EAGetKeySize (ea) >= key)
			key = EAGetKeySize (ea);
	}

	return key;
}


// Returns number of ciphers in EA
int EAGetCipherCount (int ea)
{
	int i = 0;
	while (EncryptionAlgorithms[ea].Ciphers[i++]);

	return i - 1;
}


int EAGetFirstCipher (int ea)
{
	return EncryptionAlgorithms[ea].Ciphers[0];
}


int EAGetLastCipher (int ea)
{
	int c, i = 0;
	while (c = EncryptionAlgorithms[ea].Ciphers[i++]);

	return EncryptionAlgorithms[ea].Ciphers[i - 2];
}


int EAGetNextCipher (int ea, int previousCipherId)
{
	int c, i = 0;
	while (c = EncryptionAlgorithms[ea].Ciphers[i++])
	{
		if (c == previousCipherId) 
			return EncryptionAlgorithms[ea].Ciphers[i];
	}

	return 0;
}


int EAGetPreviousCipher (int ea, int previousCipherId)
{
	int c, i = 0;

	if (EncryptionAlgorithms[ea].Ciphers[i++] == previousCipherId)
		return 0;

	while (c = EncryptionAlgorithms[ea].Ciphers[i++])
	{
		if (c == previousCipherId) 
			return EncryptionAlgorithms[ea].Ciphers[i - 2];
	}

	return 0;
}


int EAIsFormatEnabled (int ea)
{
	return EncryptionAlgorithms[ea].FormatEnabled;
}


// Returns TRUE if the mode of operation is supported for the encryption algorithm
BOOL EAIsModeSupported (int ea, int testedMode)
{
	int mode;

	for (mode = EAGetFirstMode (ea); mode != 0; mode = EAGetNextMode (ea, mode))
	{
		if (mode == testedMode)
			return TRUE;
	}
	return FALSE;
}


Hash *HashGet (int id)
{
	int i;
	for (i = 0; Hashes[i].Id != 0; i++)
		if (Hashes[i].Id == id)
			return &Hashes[i];

	return 0;
}


int HashGetIdByName (char *name)
{
	int i;
	for (i = 0; Hashes[i].Id != 0; i++)
		if (strcmp (Hashes[i].Name, name) == 0)
			return Hashes[i].Id;

	return 0;
}


char *HashGetName (int hashId)
{
	return HashGet (hashId) -> Name;
}


BOOL HashIsDeprecated (int hashId)
{
	return HashGet (hashId) -> Deprecated;
}


#endif // TC_WINDOWS_BOOT_SINGLE_CIPHER_MODE


#ifdef TC_WINDOWS_BOOT

static byte CryptoInfoBufferInUse = 0;
CRYPTO_INFO CryptoInfoBuffer;

#endif

PCRYPTO_INFO crypto_open ()
{
#ifndef TC_WINDOWS_BOOT

	/* Do the crt allocation */
	PCRYPTO_INFO cryptoInfo = (PCRYPTO_INFO) TCalloc (sizeof (CRYPTO_INFO));
	if (cryptoInfo == NULL)
		return NULL;

	memset (cryptoInfo, 0, sizeof (CRYPTO_INFO));

#ifndef DEVICE_DRIVER
	VirtualLock (cryptoInfo, sizeof (CRYPTO_INFO));
#endif

	cryptoInfo->ea = -1;
	return cryptoInfo;

#else // TC_WINDOWS_BOOT

#if 0
	if (CryptoInfoBufferInUse)
		TC_THROW_FATAL_EXCEPTION;
#endif
	CryptoInfoBufferInUse = 1;
	return &CryptoInfoBuffer;

#endif // TC_WINDOWS_BOOT
}

void crypto_loadkey (PKEY_INFO keyInfo, char *lpszUserKey, int nUserKeyLen)
{
	keyInfo->keyLength = nUserKeyLen;
	burn (keyInfo->userKey, sizeof (keyInfo->userKey));
	memcpy (keyInfo->userKey, lpszUserKey, nUserKeyLen);
}

void crypto_close (PCRYPTO_INFO cryptoInfo)
{
#ifndef TC_WINDOWS_BOOT

	if (cryptoInfo != NULL)
	{
		burn (cryptoInfo, sizeof (CRYPTO_INFO));
#ifndef DEVICE_DRIVER
		VirtualUnlock (cryptoInfo, sizeof (CRYPTO_INFO));
#endif
		TCfree (cryptoInfo);
	}

#else // TC_WINDOWS_BOOT

	burn (&CryptoInfoBuffer, sizeof (CryptoInfoBuffer));
	CryptoInfoBufferInUse = FALSE;

#endif // TC_WINDOWS_BOOT
}


#ifndef TC_WINDOWS_BOOT_SINGLE_CIPHER_MODE


#ifndef TC_NO_COMPILER_INT64
void Xor128 (unsigned __int64 *a, unsigned __int64 *b)
{
	*a++ ^= *b++;
	*a ^= *b;
}


void Xor64 (unsigned __int64 *a, unsigned __int64 *b)
{
	*a ^= *b;
}


void EncryptBufferLRW128 (byte *buffer, uint64 length, uint64 blockIndex, PCRYPTO_INFO cryptoInfo)
{
	/* Deprecated/legacy */

	int cipher = EAGetFirstCipher (cryptoInfo->ea);
	int cipherCount = EAGetCipherCount (cryptoInfo->ea);
	unsigned __int8 *p = buffer;
	unsigned __int8 *ks = cryptoInfo->ks;
	unsigned __int8 i[8];
	unsigned __int8 t[16];
	unsigned __int64 b;

	*(unsigned __int64 *)i = BE64(blockIndex);

	if (length % 16)
		TC_THROW_FATAL_EXCEPTION;

	// Note that the maximum supported volume size is 8589934592 GB  (i.e., 2^63 bytes).

	for (b = 0; b < length >> 4; b++)
	{
		Gf128MulBy64Tab (i, t, &cryptoInfo->gf_ctx);
		Xor128 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		if (cipherCount > 1)
		{
			// Cipher cascade
			for (cipher = EAGetFirstCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetNextCipher (cryptoInfo->ea, cipher))
			{
				EncipherBlock (cipher, p, ks);
				ks += CipherGetKeyScheduleSize (cipher);
			}
			ks = cryptoInfo->ks;
		}
		else
		{
			EncipherBlock (cipher, p, ks);
		}

		Xor128 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		p += 16;

		if (i[7] != 0xff)
			i[7]++;
		else
			*(unsigned __int64 *)i = BE64 ( BE64(*(unsigned __int64 *)i) + 1 );
	}

	FAST_ERASE64 (t, sizeof(t));
}


void EncryptBufferLRW64 (byte *buffer, uint64 length, uint64 blockIndex, PCRYPTO_INFO cryptoInfo)
{
	/* Deprecated/legacy */

	int cipher = EAGetFirstCipher (cryptoInfo->ea);
	unsigned __int8 *p = buffer;
	unsigned __int8 *ks = cryptoInfo->ks;
	unsigned __int8 i[8];
	unsigned __int8 t[8];
	unsigned __int64 b;

	*(unsigned __int64 *)i = BE64(blockIndex);

	if (length % 8)
		TC_THROW_FATAL_EXCEPTION;

	for (b = 0; b < length >> 3; b++)
	{
		Gf64MulTab (i, t, &cryptoInfo->gf_ctx);
		Xor64 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		EncipherBlock (cipher, p, ks);

		Xor64 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		p += 8;

		if (i[7] != 0xff)
			i[7]++;
		else
			*(unsigned __int64 *)i = BE64 ( BE64(*(unsigned __int64 *)i) + 1 );
	}

	FAST_ERASE64 (t, sizeof(t));
}


void DecryptBufferLRW128 (byte *buffer, uint64 length, uint64 blockIndex, PCRYPTO_INFO cryptoInfo)
{
	/* Deprecated/legacy */

	int cipher = EAGetFirstCipher (cryptoInfo->ea);
	int cipherCount = EAGetCipherCount (cryptoInfo->ea);
	unsigned __int8 *p = buffer;
	unsigned __int8 *ks = cryptoInfo->ks;
	unsigned __int8 i[8];
	unsigned __int8 t[16];
	unsigned __int64 b;

	*(unsigned __int64 *)i = BE64(blockIndex);

	if (length % 16)
		TC_THROW_FATAL_EXCEPTION;

	// Note that the maximum supported volume size is 8589934592 GB  (i.e., 2^63 bytes).

	for (b = 0; b < length >> 4; b++)
	{
		Gf128MulBy64Tab (i, t, &cryptoInfo->gf_ctx);
		Xor128 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		if (cipherCount > 1)
		{
			// Cipher cascade
			ks = cryptoInfo->ks + EAGetKeyScheduleSize (cryptoInfo->ea);

			for (cipher = EAGetLastCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetPreviousCipher (cryptoInfo->ea, cipher))
			{
				ks -= CipherGetKeyScheduleSize (cipher);
				DecipherBlock (cipher, p, ks);
			}
		}
		else
		{
			DecipherBlock (cipher, p, ks);
		}

		Xor128 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		p += 16;

		if (i[7] != 0xff)
			i[7]++;
		else
			*(unsigned __int64 *)i = BE64 ( BE64(*(unsigned __int64 *)i) + 1 );
	}

	FAST_ERASE64 (t, sizeof(t));
}



void DecryptBufferLRW64 (byte *buffer, uint64 length, uint64 blockIndex, PCRYPTO_INFO cryptoInfo)
{
	/* Deprecated/legacy */

	int cipher = EAGetFirstCipher (cryptoInfo->ea);
	unsigned __int8 *p = buffer;
	unsigned __int8 *ks = cryptoInfo->ks;
	unsigned __int8 i[8];
	unsigned __int8 t[8];
	unsigned __int64 b;

	*(unsigned __int64 *)i = BE64(blockIndex);

	if (length % 8)
		TC_THROW_FATAL_EXCEPTION;

	for (b = 0; b < length >> 3; b++)
	{
		Gf64MulTab (i, t, &cryptoInfo->gf_ctx);
		Xor64 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		DecipherBlock (cipher, p, ks);

		Xor64 ((unsigned __int64 *)p, (unsigned __int64 *)t);

		p += 8;

		if (i[7] != 0xff)
			i[7]++;
		else
			*(unsigned __int64 *)i = BE64 ( BE64(*(unsigned __int64 *)i) + 1 );
	}

	FAST_ERASE64 (t, sizeof(t));
}


// Initializes IV and whitening values for sector encryption/decryption in CBC mode.
// IMPORTANT: This function has been deprecated (legacy).
static void 
InitSectorIVAndWhitening (unsigned __int64 unitNo,
	int blockSize,
	unsigned __int32 *iv,
	unsigned __int64 *ivSeed,
	unsigned __int32 *whitening)
{

	/* IMPORTANT: This function has been deprecated (legacy) */

	unsigned __int64 iv64[4];
	unsigned __int32 *iv32 = (unsigned __int32 *) iv64;

	iv64[0] = ivSeed[0] ^ LE64(unitNo);
	iv64[1] = ivSeed[1] ^ LE64(unitNo);
	iv64[2] = ivSeed[2] ^ LE64(unitNo);
	if (blockSize == 16)
	{
		iv64[3] = ivSeed[3] ^ LE64(unitNo);
	}

	iv[0] = iv32[0];
	iv[1] = iv32[1];

	switch (blockSize)
	{
	case 16:

		// 128-bit block

		iv[2] = iv32[2];
		iv[3] = iv32[3];

		whitening[0] = LE32( crc32int ( &iv32[4] ) ^ crc32int ( &iv32[7] ) );
		whitening[1] = LE32( crc32int ( &iv32[5] ) ^ crc32int ( &iv32[6] ) );
		break;

	case 8:

		// 64-bit block

		whitening[0] = LE32( crc32int ( &iv32[2] ) ^ crc32int ( &iv32[5] ) );
		whitening[1] = LE32( crc32int ( &iv32[3] ) ^ crc32int ( &iv32[4] ) );
		break;

	default:
		TC_THROW_FATAL_EXCEPTION;
	}
}


// EncryptBufferCBC    (deprecated/legacy)
//
// data:		data to be encrypted
// len:			number of bytes to encrypt (must be divisible by the largest cipher block size)
// ks:			scheduled key
// iv:			IV
// whitening:	whitening constants
// ea:			outer-CBC cascade ID (0 = CBC/inner-CBC)
// cipher:		CBC/inner-CBC cipher ID (0 = outer-CBC)

static void
EncryptBufferCBC (unsigned __int32 *data, 
		 unsigned int len,
		 unsigned __int8 *ks,
		 unsigned __int32 *iv,
		 unsigned __int32 *whitening,
		 int ea,
		 int cipher)
{
	/* IMPORTANT: This function has been deprecated (legacy) */

	unsigned __int32 bufIV[4];
	unsigned __int64 i;
	int blockSize = CipherGetBlockSize (ea != 0 ? EAGetFirstCipher (ea) : cipher);

	if (len % blockSize)
		TC_THROW_FATAL_EXCEPTION;

	//  IV
	bufIV[0] = iv[0];
	bufIV[1] = iv[1];
	if (blockSize == 16)
	{
		bufIV[2] = iv[2];
		bufIV[3] = iv[3];
	}

	// Encrypt each block
	for (i = 0; i < len/blockSize; i++)
	{
		// CBC
		data[0] ^= bufIV[0];
		data[1] ^= bufIV[1];
		if (blockSize == 16)
		{
			data[2] ^= bufIV[2];
			data[3] ^= bufIV[3];
		}

		if (ea != 0)
		{
			// Outer-CBC
			for (cipher = EAGetFirstCipher (ea); cipher != 0; cipher = EAGetNextCipher (ea, cipher))
			{
				EncipherBlock (cipher, data, ks);
				ks += CipherGetKeyScheduleSize (cipher);
			}
			ks -= EAGetKeyScheduleSize (ea);
		}
		else
		{
			// CBC/inner-CBC
			EncipherBlock (cipher, data, ks);
		}

		// CBC
		bufIV[0] = data[0];
		bufIV[1] = data[1];
		if (blockSize == 16)
		{
			bufIV[2] = data[2];
			bufIV[3] = data[3];
		}

		// Whitening
		data[0] ^= whitening[0];
		data[1] ^= whitening[1];
		if (blockSize == 16)
		{
			data[2] ^= whitening[0];
			data[3] ^= whitening[1];
		}

		data += blockSize / sizeof(*data);
	}
}


// DecryptBufferCBC  (deprecated/legacy)
//
// data:		data to be decrypted
// len:			number of bytes to decrypt (must be divisible by the largest cipher block size)
// ks:			scheduled key
// iv:			IV
// whitening:	whitening constants
// ea:			outer-CBC cascade ID (0 = CBC/inner-CBC)
// cipher:		CBC/inner-CBC cipher ID (0 = outer-CBC)

static void
DecryptBufferCBC (unsigned __int32 *data,
		 unsigned int len,
		 unsigned __int8 *ks,
		 unsigned __int32 *iv,
 		 unsigned __int32 *whitening,
		 int ea,
		 int cipher)
{

	/* IMPORTANT: This function has been deprecated (legacy) */

	unsigned __int32 bufIV[4];
	unsigned __int64 i;
	unsigned __int32 ct[4];
	int blockSize = CipherGetBlockSize (ea != 0 ? EAGetFirstCipher (ea) : cipher);

	if (len % blockSize)
		TC_THROW_FATAL_EXCEPTION;

	//  IV
	bufIV[0] = iv[0];
	bufIV[1] = iv[1];
	if (blockSize == 16)
	{
		bufIV[2] = iv[2];
		bufIV[3] = iv[3];
	}

	// Decrypt each block
	for (i = 0; i < len/blockSize; i++)
	{
		// Dewhitening
		data[0] ^= whitening[0];
		data[1] ^= whitening[1];
		if (blockSize == 16)
		{
			data[2] ^= whitening[0];
			data[3] ^= whitening[1];
		}

		// CBC
		ct[0] = data[0];
		ct[1] = data[1];
		if (blockSize == 16)
		{
			ct[2] = data[2];
			ct[3] = data[3];
		}

		if (ea != 0)
		{
			// Outer-CBC
			ks += EAGetKeyScheduleSize (ea);
			for (cipher = EAGetLastCipher (ea); cipher != 0; cipher = EAGetPreviousCipher (ea, cipher))
			{
				ks -= CipherGetKeyScheduleSize (cipher);
				DecipherBlock (cipher, data, ks);
			}
		}
		else
		{
			// CBC/inner-CBC
			DecipherBlock (cipher, data, ks);
		}

		// CBC
		data[0] ^= bufIV[0];
		data[1] ^= bufIV[1];
		bufIV[0] = ct[0];
		bufIV[1] = ct[1];
		if (blockSize == 16)
		{
			data[2] ^= bufIV[2];
			data[3] ^= bufIV[3];
			bufIV[2] = ct[2];
			bufIV[3] = ct[3];
		}

		data += blockSize / sizeof(*data);
	}
}
#endif	// #ifndef TC_NO_COMPILER_INT64


// EncryptBuffer
//
// buf:  data to be encrypted; the start of the buffer is assumed to be aligned with the start of a data unit.
// len:  number of bytes to encrypt; must be divisible by the block size (for cascaded ciphers, divisible 
//       by the largest block size used within the cascade)
void EncryptBuffer (unsigned __int8 *buf, TC_LARGEST_COMPILER_UINT len, PCRYPTO_INFO cryptoInfo)
{
	switch (cryptoInfo->mode)
	{
	case XTS:
		{
			unsigned __int8 *ks = cryptoInfo->ks;
			unsigned __int8 *ks2 = cryptoInfo->ks2;
			UINT64_STRUCT dataUnitNo;
			int cipher;

			// When encrypting/decrypting a buffer (typically a volume header) the sequential number
			// of the first XTS data unit in the buffer is always 0 and the start of the buffer is
			// always assumed to be aligned with the start of a data unit.
			dataUnitNo.LowPart = 0;
			dataUnitNo.HighPart = 0;

			for (cipher = EAGetFirstCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetNextCipher (cryptoInfo->ea, cipher))
			{
				EncryptBufferXTS (buf, len, &dataUnitNo, 0, ks, ks2, cipher);

				ks += CipherGetKeyScheduleSize (cipher);
				ks2 += CipherGetKeyScheduleSize (cipher);
			}
		}
		break;

#ifndef TC_NO_COMPILER_INT64
	case LRW:

		/* Deprecated/legacy */

		switch (CipherGetBlockSize (EAGetFirstCipher (cryptoInfo->ea)))
		{
		case 8:
			EncryptBufferLRW64 ((unsigned __int8 *)buf, (unsigned __int64) len, 1, cryptoInfo);
			break;

		case 16:
			EncryptBufferLRW128 ((unsigned __int8 *)buf, (unsigned __int64) len, 1, cryptoInfo);
			break;

		default:
			TC_THROW_FATAL_EXCEPTION;
		}
		break;

	case CBC:
	case INNER_CBC:
		{
			/* Deprecated/legacy */

			unsigned __int8 *ks = cryptoInfo->ks;
			int cipher;

			for (cipher = EAGetFirstCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetNextCipher (cryptoInfo->ea, cipher))
			{
				EncryptBufferCBC ((unsigned __int32 *) buf,
					(unsigned int) len,
					ks,
					(unsigned __int32 *) cryptoInfo->k2,
					(unsigned __int32 *) &cryptoInfo->k2[8],
					0,
					cipher);

				ks += CipherGetKeyScheduleSize (cipher);
			}
		}
		break;

	case OUTER_CBC:

		/* Deprecated/legacy */

		EncryptBufferCBC ((unsigned __int32 *) buf,
			(unsigned int) len,
			cryptoInfo->ks,
			(unsigned __int32 *) cryptoInfo->k2,
			(unsigned __int32 *) &cryptoInfo->k2[8],
			cryptoInfo->ea,
			0);

		break;
#endif	// #ifndef TC_NO_COMPILER_INT64

	default:		
		// Unknown/wrong ID
		TC_THROW_FATAL_EXCEPTION;
	}
}

#ifndef TC_NO_COMPILER_INT64
// Converts a data unit number to the index of the first LRW block in the data unit.
// Note that the maximum supported volume size is 8589934592 GB  (i.e., 2^63 bytes).
uint64 DataUnit2LRWIndex (uint64 dataUnit, int blockSize, PCRYPTO_INFO ci)
{
	/* Deprecated/legacy */

	if (ci->hiddenVolume)
		dataUnit -= ci->hiddenVolumeOffset / ENCRYPTION_DATA_UNIT_SIZE;
	else
		dataUnit -= TC_VOLUME_HEADER_SIZE_LEGACY / ENCRYPTION_DATA_UNIT_SIZE;	// Compensate for the volume header size

	switch (blockSize)
	{
	case 8:
		return (dataUnit << 6) | 1;

	case 16:
		return (dataUnit << 5) | 1;

	default:
		TC_THROW_FATAL_EXCEPTION;
	}

	return 0;
}
#endif	// #ifndef TC_NO_COMPILER_INT64


// buf:			data to be encrypted
// unitNo:		sequential number of the data unit with which the buffer starts
// nbrUnits:	number of data units in the buffer
void EncryptDataUnits (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, uint32 nbrUnits, PCRYPTO_INFO ci)
#ifndef TC_WINDOWS_BOOT
{
	EncryptionThreadPoolDoWork (EncryptDataUnitsWork, buf, structUnitNo, nbrUnits, ci);
}

void EncryptDataUnitsCurrentThread (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
#endif // !TC_WINDOWS_BOOT
{
	int ea = ci->ea;
	unsigned __int8 *ks = ci->ks;
	unsigned __int8 *ks2 = ci->ks2;
	int cipher;

#ifndef TC_NO_COMPILER_INT64
	void *iv = ci->k2;									// Deprecated/legacy
	unsigned __int64 unitNo = structUnitNo->Value;
	unsigned __int64 *iv64 = (unsigned __int64 *) iv;	// Deprecated/legacy
	unsigned __int32 sectorIV[4];						// Deprecated/legacy
	unsigned __int32 secWhitening[2];					// Deprecated/legacy
#endif

	switch (ci->mode)
	{
	case XTS:
		for (cipher = EAGetFirstCipher (ea); cipher != 0; cipher = EAGetNextCipher (ea, cipher))
		{
			EncryptBufferXTS (buf,
				nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				structUnitNo,
				0,
				ks,
				ks2,
				cipher);

			ks += CipherGetKeyScheduleSize (cipher);
			ks2 += CipherGetKeyScheduleSize (cipher);
		}
		break;

#ifndef TC_NO_COMPILER_INT64
	case LRW:

		/* Deprecated/legacy */

		switch (CipherGetBlockSize (EAGetFirstCipher (ea)))
		{
		case 8:
			EncryptBufferLRW64 (buf,
				(unsigned __int64) nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				DataUnit2LRWIndex (unitNo, 8, ci),
				ci);
			break;

		case 16:
			EncryptBufferLRW128 (buf,
				(unsigned __int64) nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				DataUnit2LRWIndex (unitNo, 16, ci),
				ci);
			break;

		default:
			TC_THROW_FATAL_EXCEPTION;
		}
		break;

	case CBC:
	case INNER_CBC:

		/* Deprecated/legacy */

		while (nbrUnits--)
		{
			for (cipher = EAGetFirstCipher (ea); cipher != 0; cipher = EAGetNextCipher (ea, cipher))
			{
				InitSectorIVAndWhitening (unitNo, CipherGetBlockSize (cipher), sectorIV, iv64, secWhitening);

				EncryptBufferCBC ((unsigned __int32 *) buf,
					ENCRYPTION_DATA_UNIT_SIZE,
					ks,
					sectorIV,
					secWhitening,
					0,
					cipher);

				ks += CipherGetKeyScheduleSize (cipher);
			}
			ks -= EAGetKeyScheduleSize (ea);
			buf += ENCRYPTION_DATA_UNIT_SIZE;
			unitNo++;
		}
		break;

	case OUTER_CBC:

		/* Deprecated/legacy */

		while (nbrUnits--)
		{
			InitSectorIVAndWhitening (unitNo, CipherGetBlockSize (EAGetFirstCipher (ea)), sectorIV, iv64, secWhitening);

			EncryptBufferCBC ((unsigned __int32 *) buf,
				ENCRYPTION_DATA_UNIT_SIZE,
				ks,
				sectorIV,
				secWhitening,
				ea,
				0);

			buf += ENCRYPTION_DATA_UNIT_SIZE;
			unitNo++;
		}
		break;
#endif	// #ifndef TC_NO_COMPILER_INT64

	default:		
		// Unknown/wrong ID
		TC_THROW_FATAL_EXCEPTION;
	}
}

// DecryptBuffer
//
// buf:  data to be decrypted; the start of the buffer is assumed to be aligned with the start of a data unit.
// len:  number of bytes to decrypt; must be divisible by the block size (for cascaded ciphers, divisible 
//       by the largest block size used within the cascade)
void DecryptBuffer (unsigned __int8 *buf, TC_LARGEST_COMPILER_UINT len, PCRYPTO_INFO cryptoInfo)
{
	switch (cryptoInfo->mode)
	{
	case XTS:
		{
			unsigned __int8 *ks = cryptoInfo->ks + EAGetKeyScheduleSize (cryptoInfo->ea);
			unsigned __int8 *ks2 = cryptoInfo->ks2 + EAGetKeyScheduleSize (cryptoInfo->ea);
			UINT64_STRUCT dataUnitNo;
			int cipher;

			// When encrypting/decrypting a buffer (typically a volume header) the sequential number
			// of the first XTS data unit in the buffer is always 0 and the start of the buffer is
			// always assumed to be aligned with the start of the data unit 0.
			dataUnitNo.LowPart = 0;
			dataUnitNo.HighPart = 0;

			for (cipher = EAGetLastCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetPreviousCipher (cryptoInfo->ea, cipher))
			{
				ks -= CipherGetKeyScheduleSize (cipher);
				ks2 -= CipherGetKeyScheduleSize (cipher);

				DecryptBufferXTS (buf, len, &dataUnitNo, 0, ks, ks2, cipher);
			}
		}
		break;

#ifndef TC_NO_COMPILER_INT64
	case LRW:

		/* Deprecated/legacy */

		switch (CipherGetBlockSize (EAGetFirstCipher (cryptoInfo->ea)))
		{
		case 8:
			DecryptBufferLRW64 (buf, (unsigned __int64) len, 1, cryptoInfo);
			break;

		case 16:
			DecryptBufferLRW128 (buf, (unsigned __int64) len, 1, cryptoInfo);
			break;

		default:
			TC_THROW_FATAL_EXCEPTION;
		}
		break;

	case CBC:
	case INNER_CBC:
		{
			/* Deprecated/legacy */

			unsigned __int8 *ks = cryptoInfo->ks + EAGetKeyScheduleSize (cryptoInfo->ea);
			int cipher;
			for (cipher = EAGetLastCipher (cryptoInfo->ea);
				cipher != 0;
				cipher = EAGetPreviousCipher (cryptoInfo->ea, cipher))
			{
				ks -= CipherGetKeyScheduleSize (cipher);

				DecryptBufferCBC ((unsigned __int32 *) buf,
					(unsigned int) len,
					ks,
					(unsigned __int32 *) cryptoInfo->k2,
					(unsigned __int32 *) &cryptoInfo->k2[8],
					0,
					cipher);
			}
		}
		break;

	case OUTER_CBC:

		/* Deprecated/legacy */

		DecryptBufferCBC ((unsigned __int32 *) buf,
			(unsigned int) len,
			cryptoInfo->ks,
			(unsigned __int32 *) cryptoInfo->k2,
			(unsigned __int32 *) &cryptoInfo->k2[8],
			cryptoInfo->ea,
			0);

		break;
#endif	// #ifndef TC_NO_COMPILER_INT64

	default:		
		// Unknown/wrong ID
		TC_THROW_FATAL_EXCEPTION;
	}
}

// buf:			data to be decrypted
// unitNo:		sequential number of the data unit with which the buffer starts
// nbrUnits:	number of data units in the buffer
void DecryptDataUnits (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, uint32 nbrUnits, PCRYPTO_INFO ci)
#ifndef TC_WINDOWS_BOOT
{
	EncryptionThreadPoolDoWork (DecryptDataUnitsWork, buf, structUnitNo, nbrUnits, ci);
}

void DecryptDataUnitsCurrentThread (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
#endif // !TC_WINDOWS_BOOT
{
	int ea = ci->ea;
	unsigned __int8 *ks = ci->ks;
	unsigned __int8 *ks2 = ci->ks2;
	int cipher;

#ifndef TC_NO_COMPILER_INT64
	void *iv = ci->k2;									// Deprecated/legacy
	unsigned __int64 unitNo = structUnitNo->Value;
	unsigned __int64 *iv64 = (unsigned __int64 *) iv;	// Deprecated/legacy
	unsigned __int32 sectorIV[4];						// Deprecated/legacy
	unsigned __int32 secWhitening[2];					// Deprecated/legacy
#endif	// #ifndef TC_NO_COMPILER_INT64


	switch (ci->mode)
	{
	case XTS:
		ks += EAGetKeyScheduleSize (ea);
		ks2 += EAGetKeyScheduleSize (ea);

		for (cipher = EAGetLastCipher (ea); cipher != 0; cipher = EAGetPreviousCipher (ea, cipher))
		{
			ks -= CipherGetKeyScheduleSize (cipher);
			ks2 -= CipherGetKeyScheduleSize (cipher);

			DecryptBufferXTS (buf,
				nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				structUnitNo,
				0,
				ks,
				ks2,
				cipher);
		}
		break;

#ifndef TC_NO_COMPILER_INT64
	case LRW:

		/* Deprecated/legacy */

		switch (CipherGetBlockSize (EAGetFirstCipher (ea)))
		{
		case 8:
			DecryptBufferLRW64 (buf,
				(unsigned __int64) nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				DataUnit2LRWIndex (unitNo, 8, ci),
				ci);
			break;

		case 16:
			DecryptBufferLRW128 (buf,
				(unsigned __int64) nbrUnits * ENCRYPTION_DATA_UNIT_SIZE,
				DataUnit2LRWIndex (unitNo, 16, ci),
				ci);
			break;

		default:
			TC_THROW_FATAL_EXCEPTION;
		}
		break;

	case CBC:
	case INNER_CBC:

		/* Deprecated/legacy */

		while (nbrUnits--)
		{
			ks += EAGetKeyScheduleSize (ea);
			for (cipher = EAGetLastCipher (ea); cipher != 0; cipher = EAGetPreviousCipher (ea, cipher))
			{
				InitSectorIVAndWhitening (unitNo, CipherGetBlockSize (cipher), sectorIV, iv64, secWhitening);

				ks -= CipherGetKeyScheduleSize (cipher);

				DecryptBufferCBC ((unsigned __int32 *) buf,
					ENCRYPTION_DATA_UNIT_SIZE,
					ks,
					sectorIV,
					secWhitening,
					0,
					cipher);
			}
			buf += ENCRYPTION_DATA_UNIT_SIZE;
			unitNo++;
		}
		break;

	case OUTER_CBC:

		/* Deprecated/legacy */

		while (nbrUnits--)
		{
			InitSectorIVAndWhitening (unitNo, CipherGetBlockSize (EAGetFirstCipher (ea)), sectorIV, iv64, secWhitening);

			DecryptBufferCBC ((unsigned __int32 *) buf,
				ENCRYPTION_DATA_UNIT_SIZE,
				ks,
				sectorIV,
				secWhitening,
				ea,
				0);

			buf += ENCRYPTION_DATA_UNIT_SIZE;
			unitNo++;
		}
		break;
#endif // #ifndef TC_NO_COMPILER_INT64

	default:		
		// Unknown/wrong ID
		TC_THROW_FATAL_EXCEPTION;
	}
}


// Returns the maximum number of bytes necessary to be generated by the PBKDF2 (PKCS #5)
int GetMaxPkcs5OutSize (void)
{
	int size = 32;

	size = max (size, EAGetLargestKeyForMode (XTS) * 2);	// Sizes of primary + secondary keys

#ifndef TC_WINDOWS_BOOT
	size = max (size, LEGACY_VOL_IV_SIZE + EAGetLargestKeyForMode (LRW));		// Deprecated/legacy
	size = max (size, LEGACY_VOL_IV_SIZE + EAGetLargestKeyForMode (CBC));		// Deprecated/legacy
	size = max (size, LEGACY_VOL_IV_SIZE + EAGetLargestKeyForMode (OUTER_CBC));	// Deprecated/legacy
	size = max (size, LEGACY_VOL_IV_SIZE + EAGetLargestKeyForMode (INNER_CBC));	// Deprecated/legacy
#endif

	return size;
}


#else // TC_WINDOWS_BOOT_SINGLE_CIPHER_MODE


#if !defined (TC_WINDOWS_BOOT_AES) && !defined (TC_WINDOWS_BOOT_SERPENT) && !defined (TC_WINDOWS_BOOT_TWOFISH)
#error No cipher defined
#endif

void EncipherBlock(int cipher, void *data, void *ks)
{
#ifdef TC_WINDOWS_BOOT_AES
	if (IsAesHwCpuSupported())
		aes_hw_cpu_encrypt ((byte *) ks, data);
	else
		aes_encrypt (data, data, ks); 
#elif defined (TC_WINDOWS_BOOT_SERPENT)
	serpent_encrypt (data, data, ks);
#elif defined (TC_WINDOWS_BOOT_TWOFISH)
	twofish_encrypt (ks, data, data);
#endif
}

void DecipherBlock(int cipher, void *data, void *ks)
{
#ifdef TC_WINDOWS_BOOT_AES
	if (IsAesHwCpuSupported())
		aes_hw_cpu_decrypt ((byte *) ks + sizeof (aes_encrypt_ctx) + 14 * 16, data);
	else
		aes_decrypt (data, data, (aes_decrypt_ctx *) ((byte *) ks + sizeof(aes_encrypt_ctx))); 
#elif defined (TC_WINDOWS_BOOT_SERPENT)
	serpent_decrypt (data, data, ks);
#elif defined (TC_WINDOWS_BOOT_TWOFISH)
	twofish_decrypt (ks, data, data);
#endif
}

int EAGetFirst ()
{
	return 1;
}

int EAGetNext (int previousEA)
{
	return 0;
}

int EAInit (int ea, unsigned char *key, unsigned __int8 *ks)
{
#ifdef TC_WINDOWS_BOOT_AES

	aes_init();

	if (aes_encrypt_key256 (key, (aes_encrypt_ctx *) ks) != EXIT_SUCCESS)
		return ERR_CIPHER_INIT_FAILURE;
	if (aes_decrypt_key256 (key, (aes_decrypt_ctx *) (ks + sizeof (aes_encrypt_ctx))) != EXIT_SUCCESS)
		return ERR_CIPHER_INIT_FAILURE;

#elif defined (TC_WINDOWS_BOOT_SERPENT)
	serpent_set_key (key, 32 * 8, ks);
#elif defined (TC_WINDOWS_BOOT_TWOFISH)
	twofish_set_key ((TwofishInstance *)ks, (const u4byte *)key, 32 * 8);
#endif
	return ERR_SUCCESS;
}

int EAGetKeySize (int ea)
{
	return 32;
}

int EAGetFirstCipher (int ea)
{
	return 1;
}

void EncryptBuffer (unsigned __int8 *buf, TC_LARGEST_COMPILER_UINT len, PCRYPTO_INFO cryptoInfo)
{
	UINT64_STRUCT dataUnitNo;
	dataUnitNo.LowPart = 0; dataUnitNo.HighPart = 0;
	EncryptBufferXTS (buf, len, &dataUnitNo, 0, cryptoInfo->ks, cryptoInfo->ks2, 1);
}

void EncryptDataUnits (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
{
	EncryptBufferXTS (buf, nbrUnits * ENCRYPTION_DATA_UNIT_SIZE, structUnitNo, 0, ci->ks, ci->ks2, 1);
}

void DecryptBuffer (unsigned __int8 *buf, TC_LARGEST_COMPILER_UINT len, PCRYPTO_INFO cryptoInfo)
{
	UINT64_STRUCT dataUnitNo;
	dataUnitNo.LowPart = 0; dataUnitNo.HighPart = 0;
	DecryptBufferXTS (buf, len, &dataUnitNo, 0, cryptoInfo->ks, cryptoInfo->ks2, 1);
}

void DecryptDataUnits (unsigned __int8 *buf, const UINT64_STRUCT *structUnitNo, TC_LARGEST_COMPILER_UINT nbrUnits, PCRYPTO_INFO ci)
{
	DecryptBufferXTS (buf, nbrUnits * ENCRYPTION_DATA_UNIT_SIZE, structUnitNo, 0, ci->ks, ci->ks2, 1);
}

#endif // TC_WINDOWS_BOOT_SINGLE_CIPHER_MODE


#if !defined (TC_WINDOWS_BOOT) || defined (TC_WINDOWS_BOOT_AES)

static BOOL HwEncryptionDisabled = FALSE;

BOOL IsAesHwCpuSupported ()
{
	static BOOL state = FALSE;
	static BOOL stateValid = FALSE;

	if (!stateValid)
	{
		state = is_aes_hw_cpu_supported() ? TRUE : FALSE;
		stateValid = TRUE;
	}

	return state && !HwEncryptionDisabled;
}

void EnableHwEncryption (BOOL enable)
{
#if defined (TC_WINDOWS_BOOT)
	if (enable)
		aes_hw_cpu_enable_sse();
#endif

	HwEncryptionDisabled = !enable;
}

BOOL IsHwEncryptionEnabled ()
{
	return !HwEncryptionDisabled;
}

#endif // !TC_WINDOWS_BOOT
