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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_Ciphers
#define TC_HEADER_Encryption_Ciphers

#include "Platform/Platform.h"


namespace TrueCrypt
{
	class Cipher;
	typedef vector < shared_ptr <Cipher> > CipherList;

	class Cipher
	{
	public:
		virtual ~Cipher ();

		virtual void DecryptBlock (byte *data) const;
		virtual void EncryptBlock (byte *data) const;
		static CipherList GetAvailableCiphers ();
		virtual size_t GetBlockSize () const = 0;
		virtual size_t GetKeySize () const = 0;
		virtual wstring GetName () const = 0;
		virtual shared_ptr <Cipher> GetNew () const = 0;
		virtual void SetKey (const ConstBufferPtr &key);

		static const int MaxBlockSize = 16;

	protected:
		Cipher ();

		virtual void Decrypt (byte *data) const = 0;
		virtual void Encrypt (byte *data) const = 0;
		virtual size_t GetScheduledKeySize () const = 0;
		virtual void SetCipherKey (const byte *key) = 0;

		bool Initialized;
		SecureBuffer ScheduledKey;

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

	struct CipherException : public Exception
	{
	protected:
		CipherException () { }
		CipherException (const string &message) : Exception (message) { }
		CipherException (const string &message, const wstring &subject) : Exception (message, subject) { }
	};


#define TC_CIPHER(NAME, BLOCK_SIZE, KEY_SIZE) \
	class TC_JOIN (Cipher,NAME) : public Cipher \
	{ \
	public: \
		TC_JOIN (Cipher,NAME) () { } \
		virtual ~TC_JOIN (Cipher,NAME) () { } \
\
		virtual size_t GetBlockSize () const { return BLOCK_SIZE; }; \
		virtual size_t GetKeySize () const { return KEY_SIZE; }; \
		virtual wstring GetName () const { return L###NAME; }; \
		virtual shared_ptr <Cipher> GetNew () const { return shared_ptr <Cipher> (new TC_JOIN (Cipher,NAME)()); } \
\
	protected: \
		virtual void Decrypt (byte *data) const; \
		virtual void Encrypt (byte *data) const; \
		virtual size_t GetScheduledKeySize () const; \
		virtual void SetCipherKey (const byte *key); \
\
	private: \
		TC_JOIN (Cipher,NAME) (const TC_JOIN (Cipher,NAME) &); \
		TC_JOIN (Cipher,NAME) &operator= (const TC_JOIN (Cipher,NAME) &); \
	}
	
	TC_CIPHER (AES, 16, 32);
	TC_CIPHER (Blowfish, 8, 56);
	TC_CIPHER (Cast5, 8, 16);
	TC_CIPHER (Serpent, 16, 32);
	TC_CIPHER (TripleDES, 8, 24);
	TC_CIPHER (Twofish, 16, 32);

#undef TC_CIPHER

	
#define TC_EXCEPTION(NAME) TC_EXCEPTION_DECL(NAME,CipherException)

#undef TC_EXCEPTION_SET
#define TC_EXCEPTION_SET \
	TC_EXCEPTION (CipherInitError); \
	TC_EXCEPTION (WeakKeyDetected);

	TC_EXCEPTION_SET;

#undef TC_EXCEPTION
}

#endif // TC_HEADER_Encryption_Ciphers

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