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# idea.h

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    00001 #ifndef CRYPTOPP_IDEA_H
    00002 #define CRYPTOPP_IDEA_H
    00003
    00004 /** \file
    00005 */
    00006
    00007 #include "seckey.h"
    00008 #include "secblock.h"
    00009
    00010 NAMESPACE_BEGIN(CryptoPP)
    00011
    00012 //! _
    00013 struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
    00014 {
    00015         static const char *StaticAlgorithmName() {return "IDEA";}
    00016 };
    00017
    00018 /// <a href="http://www.weidai.com/scan-mirror/cs.html#IDEA">IDEA</a>
    00019 class IDEA : public IDEA_Info, public BlockCipherDocumentation
    00020 {
    00021 public:         // made public for internal purposes
    00022 #ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
    00023         typedef word Word;
    00024 #else
    00025         typedef hword Word;
    00026 #endif
    00027
    00028 private:
    00029         class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
    00030         {
    00031         public:
    00032                 unsigned int GetAlignment() const {return 2;}
    00033                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    00034
    00035                 void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
    00036
    00037         private:
    00038                 void EnKey(const byte *);
    00039                 void DeKey();
    00040                 FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;
    00041
    00042         #ifdef IDEA_LARGECACHE
    00043                 static inline void LookupMUL(word &a, word b);
    00044                 void LookupKeyLogs();
    00045                 static void BuildLogTables();
    00046                 static bool tablesBuilt;
    00047                 static word16 log[0x10000], antilog[0x10000];
    00048         #endif
    00049         };
    00050
    00051 public:
    00052         typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
    00053         typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
    00054 };
    00055
    00056 typedef IDEA::Encryption IDEAEncryption;
    00057 typedef IDEA::Decryption IDEADecryption;
    00058
    00059 NAMESPACE_END
    00060
    00061 #endif