Crypto++
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00001 #ifndef CRYPTOPP_ARC4_H 00002 #define CRYPTOPP_ARC4_H 00003 00004 #include "strciphr.h" 00005 00006 NAMESPACE_BEGIN(CryptoPP) 00007 00008 namespace Weak1 { 00009 00010 //! _ 00011 class CRYPTOPP_NO_VTABLE ARC4_Base : public VariableKeyLength<16, 1, 256>, public RandomNumberGenerator, public SymmetricCipher, public SymmetricCipherDocumentation 00012 { 00013 public: 00014 ~ARC4_Base(); 00015 00016 static const char *StaticAlgorithmName() {return "ARC4";} 00017 00018 void GenerateBlock(byte *output, size_t size); 00019 void DiscardBytes(size_t n); 00020 00021 void ProcessData(byte *outString, const byte *inString, size_t length); 00022 00023 bool IsRandomAccess() const {return false;} 00024 bool IsSelfInverting() const {return true;} 00025 bool IsForwardTransformation() const {return true;} 00026 00027 typedef SymmetricCipherFinal<ARC4_Base> Encryption; 00028 typedef SymmetricCipherFinal<ARC4_Base> Decryption; 00029 00030 protected: 00031 void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms); 00032 virtual unsigned int GetDefaultDiscardBytes() const {return 0;} 00033 00034 FixedSizeSecBlock<byte, 256> m_state; 00035 byte m_x, m_y; 00036 }; 00037 00038 //! <a href="http://www.weidai.com/scan-mirror/cs.html#RC4">Alleged RC4</a> 00039 DOCUMENTED_TYPEDEF(SymmetricCipherFinal<ARC4_Base>, ARC4) 00040 00041 //! _ 00042 class CRYPTOPP_NO_VTABLE MARC4_Base : public ARC4_Base 00043 { 00044 public: 00045 static const char *StaticAlgorithmName() {return "MARC4";} 00046 00047 typedef SymmetricCipherFinal<MARC4_Base> Encryption; 00048 typedef SymmetricCipherFinal<MARC4_Base> Decryption; 00049 00050 protected: 00051 unsigned int GetDefaultDiscardBytes() const {return 256;} 00052 }; 00053 00054 //! Modified ARC4: it discards the first 256 bytes of keystream which may be weaker than the rest 00055 DOCUMENTED_TYPEDEF(SymmetricCipherFinal<MARC4_Base>, MARC4) 00056 00057 } 00058 #if CRYPTOPP_ENABLE_NAMESPACE_WEAK >= 1 00059 namespace Weak {using namespace Weak1;} // import Weak1 into CryptoPP::Weak 00060 #else 00061 using namespace Weak1; // import Weak1 into CryptoPP with warning 00062 #ifdef __GNUC__ 00063 #warning "You may be using a weak algorithm that has been retained for backwards compatibility. Please '#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1' before including this .h file and prepend the class name with 'Weak::' to remove this warning." 00064 #else 00065 #pragma message("You may be using a weak algorithm that has been retained for backwards compatibility. Please '#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1' before including this .h file and prepend the class name with 'Weak::' to remove this warning.") 00066 #endif 00067 #endif 00068 00069 NAMESPACE_END 00070 00071 #endif