idea.h

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#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 GetAlignment() 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

---