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rc2.h

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00001 #ifndef CRYPTOPP_RC2_H
00002 #define CRYPTOPP_RC2_H
00003 
00004 /** \file
00005 */
00006 
00007 #include "seckey.h"
00008 #include "secblock.h"
00009 
00010 NAMESPACE_BEGIN(CryptoPP)
00011 
00012 struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
00013 {
00014         enum {DEFAULT_EFFECTIVE_KEYLENGTH = 1024, MAX_EFFECTIVE_KEYLENGTH = 1024};
00015         static const char *StaticAlgorithmName() {return "RC2";}
00016 };
00017 
00018 /// <a href="http://www.weidai.com/scan-mirror/cs.html#RC2">RC2</a>
00019 class RC2 : public RC2_Info, public BlockCipherDocumentation
00020 {
00021         class Base : public BlockCipherBaseTemplate<RC2_Info>
00022         {
00023         public:
00024                 void UncheckedSetKey(CipherDir direction, const byte *key, unsigned int length, unsigned int effectiveKeyLength);
00025                 void SetKeyWithEffectiveKeyLength(const byte *key, unsigned int length, unsigned int effectiveKeyLength);
00026 
00027         protected:
00028                 template <class T>
00029                 static inline void CheckedSetKey(T *obj, CipherDir dir, const byte *key, unsigned int length, const NameValuePairs &param)
00030                 {
00031                         obj->ThrowIfInvalidKeyLength(length);
00032                         int effectiveKeyLength = param.GetIntValueWithDefault("EffectiveKeyLength", DEFAULT_EFFECTIVE_KEYLENGTH);
00033                         obj->SetKeyWithEffectiveKeyLength(key, length, effectiveKeyLength);
00034                 }
00035 
00036                 FixedSizeSecBlock<word16, 64> K;  // expanded key table
00037         };
00038 
00039         class Enc : public Base
00040         {
00041         public:
00042                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00043         };
00044 
00045         class Dec : public Base
00046         {
00047         public:
00048                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00049         };
00050 
00051 public:
00052         class Encryption : public BlockCipherTemplate<ENCRYPTION, Enc>
00053         {
00054         public:
00055                 Encryption() {}
00056                 Encryption(const byte *key, unsigned int keyLen=DEFAULT_KEYLENGTH, unsigned int effectiveLen=1024)
00057                         {SetKeyWithEffectiveKeyLength(key, keyLen, effectiveLen);}
00058         };
00059 
00060         class Decryption : public BlockCipherTemplate<DECRYPTION, Dec>
00061         {
00062         public:
00063                 Decryption() {}
00064                 Decryption(const byte *key, unsigned int keyLen=DEFAULT_KEYLENGTH, unsigned int effectiveLen=1024)
00065                         {SetKeyWithEffectiveKeyLength(key, keyLen, effectiveLen);}
00066         };
00067 };
00068 
00069 typedef RC2::Encryption RC2Encryption;
00070 typedef RC2::Decryption RC2Decryption;
00071 
00072 NAMESPACE_END
00073 
00074 #endif

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