1#ifndef CRYPTOPP_IDEA_H
2#define CRYPTOPP_IDEA_H
3
4/** \file
5*/
6
7#include "seckey.h"
8#include "secblock.h"
9
10NAMESPACE_BEGIN(CryptoPP)
11
12//! _
13struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
14{
15	static const char *StaticAlgorithmName() {return "IDEA";}
16};
17
18/// <a href="http://www.weidai.com/scan-mirror/cs.html#IDEA">IDEA</a>
19class IDEA : public IDEA_Info, public BlockCipherDocumentation
20{
21public:		// made public for internal purposes
22#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
23	typedef word Word;
24#else
25	typedef hword Word;
26#endif
27
28private:
29	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
30	{
31	public:
32		unsigned int OptimalDataAlignment() const {return 2;}
33		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
34
35		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
36
37	private:
38		void EnKey(const byte *);
39		void DeKey();
40		FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;
41
42	#ifdef IDEA_LARGECACHE
43		static inline void LookupMUL(word &a, word b);
44		void LookupKeyLogs();
45		static void BuildLogTables();
46		static bool tablesBuilt;
47		static word16 log[0x10000], antilog[0x10000];
48	#endif
49	};
50
51public:
52	typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
53	typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
54};
55
56typedef IDEA::Encryption IDEAEncryption;
57typedef IDEA::Decryption IDEADecryption;
58
59NAMESPACE_END
60
61#endif
62