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84 lines
2.9 KiB
84 lines
2.9 KiB
5 years ago
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// arc4.h - written and placed in the public domain by Wei Dai
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//! \file arc4.h
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//! \brief Classes for ARC4 cipher
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#ifndef CRYPTOPP_ARC4_H
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#define CRYPTOPP_ARC4_H
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#include "cryptlib.h"
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#include "strciphr.h"
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#include "secblock.h"
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#include "smartptr.h"
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NAMESPACE_BEGIN(CryptoPP)
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namespace Weak1 {
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//! \class ARC4_Base
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//! \brief Class specific methods used to operate the cipher.
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//! \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
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class CRYPTOPP_NO_VTABLE ARC4_Base : public VariableKeyLength<16, 1, 256>, public RandomNumberGenerator, public SymmetricCipher, public SymmetricCipherDocumentation
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{
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public:
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~ARC4_Base();
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static const char *StaticAlgorithmName() {return "ARC4";}
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void GenerateBlock(byte *output, size_t size);
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void DiscardBytes(size_t n);
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void ProcessData(byte *outString, const byte *inString, size_t length);
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bool IsRandomAccess() const {return false;}
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bool IsSelfInverting() const {return true;}
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bool IsForwardTransformation() const {return true;}
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typedef SymmetricCipherFinal<ARC4_Base> Encryption;
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typedef SymmetricCipherFinal<ARC4_Base> Decryption;
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protected:
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void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
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virtual unsigned int GetDefaultDiscardBytes() const {return 0;}
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FixedSizeSecBlock<byte, 256> m_state;
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byte m_x, m_y;
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};
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//! <a href="http://www.weidai.com/scan-mirror/cs.html#RC4">Alleged RC4</a>
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DOCUMENTED_TYPEDEF(SymmetricCipherFinal<ARC4_Base>, ARC4)
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//! \class MARC4_Base
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//! \brief Class specific methods used to operate the cipher.
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//! \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
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//! \details MARC4 discards the first 256 bytes of keystream, which may be weaker than the rest
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class CRYPTOPP_NO_VTABLE MARC4_Base : public ARC4_Base
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{
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public:
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static const char *StaticAlgorithmName() {return "MARC4";}
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typedef SymmetricCipherFinal<MARC4_Base> Encryption;
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typedef SymmetricCipherFinal<MARC4_Base> Decryption;
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protected:
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unsigned int GetDefaultDiscardBytes() const {return 256;}
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};
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DOCUMENTED_TYPEDEF(SymmetricCipherFinal<MARC4_Base>, MARC4)
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}
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#if CRYPTOPP_ENABLE_NAMESPACE_WEAK >= 1
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namespace Weak {using namespace Weak1;} // import Weak1 into CryptoPP::Weak
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#else
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using namespace Weak1; // import Weak1 into CryptoPP with warning
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#ifdef __GNUC__
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#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."
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#else
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#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.")
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#endif
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#endif
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NAMESPACE_END
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#endif
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