// idea.h - originally written and placed in the public domain by Wei Dai

/// \file idea.h

/// \brief Classes for the IDEA block cipher

#ifndef CRYPTOPP_IDEA_H

#define CRYPTOPP_IDEA_H

#include "seckey.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

/// \brief IDEA block cipher information

/// \since Crypto++ 1.0

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

{

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

};

/// \brief IDEA block cipher

/// \sa <a href="http://www.cryptopp.com/wiki/IDEA">IDEA</a>

/// \since Crypto++ 1.0

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 volatile 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