include/cryptopp/idea.h

0001 // idea.h - originally written and placed in the public domain by Wei Dai

0002
0003 /// \file idea.h

0004 /// \brief Classes for the IDEA block cipher

0005
0006 #ifndef CRYPTOPP_IDEA_H
0007 #define CRYPTOPP_IDEA_H
0008
0009 #include "seckey.h"
0010 #include "secblock.h"
0011
0012 NAMESPACE_BEGIN(CryptoPP)
0013
0014 /// \brief IDEA block cipher information

0015 /// \since Crypto++ 1.0

0016 struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
0017 {
0018     CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "IDEA";}
0019 };
0020
0021 /// \brief IDEA block cipher

0022 /// \sa <a href="http://www.cryptopp.com/wiki/IDEA">IDEA</a>

0023 /// \since Crypto++ 1.0

0024 class IDEA : public IDEA_Info, public BlockCipherDocumentation
0025 {
0026 public:     // made public for internal purposes

0027 #ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
0028     typedef word Word;
0029 #else
0030     typedef hword Word;
0031 #endif
0032
0033 private:
0034     class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
0035     {
0036     public:
0037         unsigned int OptimalDataAlignment() const {return 2;}
0038         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
0039
0040         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
0041
0042     private:
0043         void EnKey(const byte *);
0044         void DeKey();
0045         FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;
0046
0047     #ifdef IDEA_LARGECACHE
0048         static inline void LookupMUL(word &a, word b);
0049         void LookupKeyLogs();
0050         static void BuildLogTables();
0051         static volatile bool tablesBuilt;
0052         static word16 log[0x10000], antilog[0x10000];
0053     #endif
0054     };
0055
0056 public:
0057     typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
0058     typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
0059 };
0060
0061 typedef IDEA::Encryption IDEAEncryption;
0062 typedef IDEA::Decryption IDEADecryption;
0063
0064 NAMESPACE_END
0065
0066 #endif