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 #include "algparam.h"
00010 
00011 NAMESPACE_BEGIN(CryptoPP)
00012 
00013 //! _
00014 struct RC2_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 1, 128>
00015 {
00016     CRYPTOPP_CONSTANT(DEFAULT_EFFECTIVE_KEYLENGTH = 1024)
00017     CRYPTOPP_CONSTANT(MAX_EFFECTIVE_KEYLENGTH = 1024)
00018     static const char *StaticAlgorithmName() {return "RC2";}
00019 };
00020 
00021 /// <a href="http://www.weidai.com/scan-mirror/cs.html#RC2">RC2</a>
00022 class RC2 : public RC2_Info, public BlockCipherDocumentation
00023 {
00024     class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC2_Info>
00025     {
00026     public:
00027         void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
00028 
00029     protected:
00030         FixedSizeSecBlock<word16, 64> K;  // expanded key table
00031     };
00032 
00033     class CRYPTOPP_NO_VTABLE Enc : public Base
00034     {
00035     public:
00036         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00037     };
00038 
00039     class CRYPTOPP_NO_VTABLE Dec : public Base
00040     {
00041     public:
00042         void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
00043     };
00044 
00045 public:
00046     class Encryption : public BlockCipherFinal<ENCRYPTION, Enc>
00047     {
00048     public:
00049         Encryption() {}
00050         Encryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
00051             {SetKey(key, keyLen);}
00052         Encryption(const byte *key, size_t keyLen, int effectiveKeyLen)
00053             {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
00054     };
00055 
00056     class Decryption : public BlockCipherFinal<DECRYPTION, Dec>
00057     {
00058     public:
00059         Decryption() {}
00060         Decryption(const byte *key, size_t keyLen=DEFAULT_KEYLENGTH)
00061             {SetKey(key, keyLen);}
00062         Decryption(const byte *key, size_t keyLen, int effectiveKeyLen)
00063             {SetKey(key, keyLen, MakeParameters("EffectiveKeyLength", effectiveKeyLen));}
00064     };
00065 };
00066 
00067 typedef RC2::Encryption RC2Encryption;
00068 typedef RC2::Decryption RC2Decryption;
00069 
00070 NAMESPACE_END
00071 
00072 #endif

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