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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         class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
00022         {
00023         public:
00024                 unsigned int GetAlignment() const {return 2;}
00025                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00026 
00027                 void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
00028 
00029         private:
00030                 void EnKey(const byte *);
00031                 void DeKey();
00032                 FixedSizeSecBlock<word, 6*ROUNDS+4> m_key;
00033 
00034         #ifdef IDEA_LARGECACHE
00035                 static inline void LookupMUL(word &a, word b);
00036                 void LookupKeyLogs();
00037                 static void BuildLogTables();
00038                 static bool tablesBuilt;
00039                 static word16 log[0x10000], antilog[0x10000];
00040         #endif
00041         };
00042 
00043 public:
00044         typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
00045         typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
00046 };
00047 
00048 typedef IDEA::Encryption IDEAEncryption;
00049 typedef IDEA::Decryption IDEADecryption;
00050 
00051 NAMESPACE_END
00052 
00053 #endif

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