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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_Encryption_EncryptionMode
#define TC_HEADER_Encryption_EncryptionMode

#include "Platform/Platform.h"
#include "Cipher.h"

namespace TrueCrypt
{
	class EncryptionMode;
	typedef list < shared_ptr <EncryptionMode> > EncryptionModeList;

	class EncryptionMode
	{
	public:
		virtual ~EncryptionMode ();

		virtual void Decrypt (byte *data, uint64 length) const = 0;
		virtual void DecryptSectors (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const = 0;
		virtual void Encrypt (byte *data, uint64 length) const = 0;
		virtual void EncryptSectors (byte *data, uint64 sectorIndex, uint64 sectorCount, size_t sectorSize) const = 0;
		static EncryptionModeList GetAvailableModes ();
		virtual size_t GetKeySize () const = 0;
		virtual wstring GetName () const = 0;
		virtual shared_ptr <EncryptionMode> GetNew () const = 0;
		virtual bool IsKeySet () const { return KeySet; }
		virtual void SetKey (const ConstBufferPtr &key) = 0;
		virtual void SetCiphers (const CipherList &ciphers) { Ciphers = ciphers; }
		virtual void SetSectorOffset (int64 offset) { SectorOffset = offset; }

	protected:
		EncryptionMode ();

		virtual void ValidateState () const;
		void ValidateParameters (byte *data, uint64 length) const;
		virtual void ValidateParameters (byte *data, uint64 sectorCount, size_t sectorSize) const;

		static const size_t EncryptionDataUnitSize = 512;

		CipherList Ciphers;
		bool KeySet;
		uint64 SectorOffset;

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

#endif // TC_HEADER_Encryption_EncryptionMode

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