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tea.h

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00001 #ifndef CRYPTOPP_TEA_H
00002 #define CRYPTOPP_TEA_H
00003 
00004 /** \file
00005 */
00006 
00007 #include "seckey.h"
00008 #include "secblock.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<32>
00013 {
00014         enum {LOG_ROUNDS=5};
00015         static const char *StaticAlgorithmName() {return "TEA";}
00016 };
00017 
00018 /// <a href="http://www.weidai.com/scan-mirror/cs.html#TEA">TEA</a>
00019 class TEA : public TEA_Info, public BlockCipherDocumentation
00020 {
00021         class Base : public BlockCipherBaseTemplate<TEA_Info>
00022         {
00023         public:
00024                 void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
00025 
00026         protected:
00027                 static const word32 DELTA;
00028                 FixedSizeSecBlock<word32, 4> k;
00029         };
00030 
00031         class Enc : public Base
00032         {
00033         public:
00034                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00035         };
00036 
00037         class Dec : public Base
00038         {
00039         public:
00040                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00041         };
00042 
00043 public:
00044         typedef BlockCipherTemplate<ENCRYPTION, Enc> Encryption;
00045         typedef BlockCipherTemplate<DECRYPTION, Dec> Decryption;
00046 };
00047 
00048 typedef TEA::Encryption TEAEncryption;
00049 typedef TEA::Decryption TEADecryption;
00050 
00051 NAMESPACE_END
00052 
00053 #endif

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