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 //! _
00013 struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
00014 {
00015         enum {DEFAULT_EFFECTIVE_KEYLENGTH = 1024, MAX_EFFECTIVE_KEYLENGTH = 1024};
00016         static const char *StaticAlgorithmName() {return "RC2";}
00017 };
00018 
00019 /// <a href="http://www.weidai.com/scan-mirror/cs.html#RC2">RC2</a>
00020 class RC2 : public RC2_Info, public BlockCipherDocumentation
00021 {
00022         class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>
00023         {
00024         public:
00025                 void UncheckedSetKey(CipherDir direction, const byte *key, unsigned int length, unsigned int effectiveKeyLength);
00026                 void SetKeyWithEffectiveKeyLength(const byte *key, unsigned int length, unsigned int effectiveKeyLength);
00027 
00028         protected:
00029                 template <class T>
00030                 static inline void CheckedSetKey(T *obj, CipherDir dir, const byte *key, unsigned int length, const NameValuePairs &param)
00031                 {
00032                         obj->ThrowIfInvalidKeyLength(length);
00033                         int effectiveKeyLength = param.GetIntValueWithDefault("EffectiveKeyLength", DEFAULT_EFFECTIVE_KEYLENGTH);
00034                         obj->SetKeyWithEffectiveKeyLength(key, length, effectiveKeyLength);
00035                 }
00036 
00037                 FixedSizeSecBlock<word16, 64> K;  // expanded key table
00038         };
00039 
00040         class CRYPTOPP_NO_VTABLE Enc : public Base
00041         {
00042         public:
00043                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00044         };
00045 
00046         class CRYPTOPP_NO_VTABLE Dec : public Base
00047         {
00048         public:
00049                 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00050         };
00051 
00052 public:
00053         class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
00054         {
00055         public:
00056                 Encryption() {}
00057                 Encryption(const byte *key, unsigned int keyLen=DEFAULT_KEYLENGTH, unsigned int effectiveLen=1024)
00058                         {SetKeyWithEffectiveKeyLength(key, keyLen, effectiveLen);}
00059         };
00060 
00061         class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
00062         {
00063         public:
00064                 Decryption() {}
00065                 Decryption(const byte *key, unsigned int keyLen=DEFAULT_KEYLENGTH, unsigned int effectiveLen=1024)
00066                         {SetKeyWithEffectiveKeyLength(key, keyLen, effectiveLen);}
00067         };
00068 };
00069 
00070 typedef RC2::Encryption RC2Encryption;
00071 typedef RC2::Decryption RC2Decryption;
00072 
00073 NAMESPACE_END
00074 
00075 #endif

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