~zooko/cryptopp/trunk

#ifndef CRYPTOPP_IDEA_H

#define CRYPTOPP_IDEA_H

/** \file

*/

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

//! _

struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>

{

	static const char *StaticAlgorithmName() {return "IDEA";}

};

/// <a href="http://www.weidai.com/scan-mirror/cs.html#IDEA">IDEA</a>

class IDEA : public IDEA_Info, public BlockCipherDocumentation

{

public:		// made public for internal purposes

#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE

	typedef word Word;

#else

	typedef hword Word;

#endif

private:

	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>

	{

	public:

		unsigned int OptimalDataAlignment() const {return 2;}

		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;

		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);

	private:

		void EnKey(const byte *);

		void DeKey();

		FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;

	#ifdef IDEA_LARGECACHE

		static inline void LookupMUL(word &a, word b);

		void LookupKeyLogs();

		static void BuildLogTables();

		static bool tablesBuilt;

		static word16 log[0x10000], antilog[0x10000];

	#endif

	};

public:

	typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;

	typedef BlockCipherFinal<DECRYPTION, Base> Decryption;

};

typedef IDEA::Encryption IDEAEncryption;

typedef IDEA::Decryption IDEADecryption;

NAMESPACE_END

#endif