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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 struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
    00013 {
    00014         static const char *StaticAlgorithmName() {return "IDEA";}
    00015 };
    00016
    00017 /// <a href="http://www.weidai.com/scan-mirror/cs.html#IDEA">IDEA</a>
    00018 class IDEA : public IDEA_Info, public BlockCipherDocumentation
    00019 {
    00020         class Base : public BlockCipherBaseTemplate<IDEA_Info>
    00021         {
    00022         public:
    00023                 unsigned int GetAlignment() const {return 2;}
    00024                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    00025
    00026                 void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
    00027
    00028         private:
    00029                 void EnKey(const byte *);
    00030                 void DeKey();
    00031                 FixedSizeSecBlock<word, 6*ROUNDS+4> m_key;
    00032
    00033         #ifdef IDEA_LARGECACHE
    00034                 static inline void LookupMUL(word &a, word b);
    00035                 void LookupKeyLogs();
    00036                 static void BuildLogTables();
    00037                 static bool tablesBuilt;
    00038                 static word16 log[0x10000], antilog[0x10000];
    00039         #endif
    00040         };
    00041
    00042 public:
    00043         typedef BlockCipherTemplate<ENCRYPTION, Base> Encryption;
    00044         typedef BlockCipherTemplate<DECRYPTION, Base> Decryption;
    00045 };
    00046
    00047 typedef IDEA::Encryption IDEAEncryption;
    00048 typedef IDEA::Decryption IDEADecryption;
    00049
    00050 NAMESPACE_END
    00051
    00052 #endif