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externals/cryptopp/idea.h

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