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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 OptimalDataAlignment() const {return 2;}
    00033         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
    00034
    00035         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
    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 volatile 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