Crypto++
|
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 ¶ms); 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