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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