idea.h

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// 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