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5.0

/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.4 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#ifndef TC_HEADER_Volume_EncryptionModeXTS
#define TC_HEADER_Volume_EncryptionModeXTS

#include "Platform/Platform.h"
#include "EncryptionMode.h"

namespace TrueCrypt
{
	class EncryptionModeXTS : public EncryptionMode
	{
	public:
		EncryptionModeXTS () { }
		virtual ~EncryptionModeXTS () { }

		virtual void Decrypt (byte *data, uint64 length) const;
		virtual void DecryptSectors (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const;
		virtual void Encrypt (byte *data, uint64 length) const;
		virtual void EncryptSectors (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const;
		virtual size_t GetKeySize () const;
		virtual wstring GetName () const { return L"XTS"; };
		virtual shared_ptr <EncryptionMode> GetNew () const { return shared_ptr <EncryptionMode> (new EncryptionModeXTS); }
		virtual void SetCiphers (const CipherList &ciphers);
		virtual void SetKey (const ConstBufferPtr &key);

	protected:
		void DecryptBuffer (byte *data, uint64 length, uint64 startDataUnitNo) const;
		void DecryptBufferXTS (const Cipher &cipher, const Cipher &secondaryCipher, byte *buffer, uint64 length, uint64 startDataUnitNo, unsigned int startCipherBlockNo) const;
		void EncryptBuffer (byte *data, uint64 length, uint64 startDataUnitNo) const;
		void EncryptBufferXTS (const Cipher &cipher, const Cipher &secondaryCipher, byte *buffer, uint64 length, uint64 startDataUnitNo, unsigned int startCipherBlockNo) const;
		void SetSecondaryCipherKeys ();

		SecureBuffer SecondaryKey;
		CipherList SecondaryCiphers;

	private:
		EncryptionModeXTS (const EncryptionModeXTS &);
		EncryptionModeXTS &operator= (const EncryptionModeXTS &);
	};
}

#endif // TC_HEADER_Volume_EncryptionModeXTS

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