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67 lines
1.7 KiB
67 lines
1.7 KiB
4 years ago
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// idea.h - originally written and placed in the public domain by Wei Dai
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/// \file idea.h
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/// \brief Classes for the IDEA block cipher
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#ifndef CRYPTOPP_IDEA_H
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#define CRYPTOPP_IDEA_H
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#include "seckey.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief IDEA block cipher information
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/// \since Crypto++ 1.0
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struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "IDEA";}
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};
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/// \brief IDEA block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/IDEA">IDEA</a>
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/// \since Crypto++ 1.0
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class IDEA : public IDEA_Info, public BlockCipherDocumentation
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{
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public: // made public for internal purposes
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#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
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typedef word Word;
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#else
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typedef hword Word;
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#endif
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private:
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class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
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{
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public:
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unsigned int OptimalDataAlignment() const {return 2;}
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
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private:
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void EnKey(const byte *);
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void DeKey();
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FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;
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#ifdef IDEA_LARGECACHE
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static inline void LookupMUL(word &a, word b);
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void LookupKeyLogs();
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static void BuildLogTables();
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static volatile bool tablesBuilt;
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static word16 log[0x10000], antilog[0x10000];
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#endif
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};
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public:
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typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
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typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
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};
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typedef IDEA::Encryption IDEAEncryption;
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typedef IDEA::Decryption IDEADecryption;
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NAMESPACE_END
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#endif
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