You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.1 KiB
90 lines
3.1 KiB
4 years ago
|
// arc4.h - originally written and placed in the public domain by Wei Dai
|
||
|
|
|
||
|
|
/// \file arc4.h
|
||
|
|
/// \brief Classes for ARC4 cipher
|
||
|
|
/// \since Crypto++ 3.1
|
||
|
|
|
||
|
|
#ifndef CRYPTOPP_ARC4_H
|
||
|
|
#define CRYPTOPP_ARC4_H
|
||
|
|
|
||
|
|
#include "cryptlib.h"
|
||
|
|
#include "strciphr.h"
|
||
|
|
#include "secblock.h"
|
||
|
|
#include "smartptr.h"
|
||
|
|
|
||
|
|
NAMESPACE_BEGIN(CryptoPP)
|
||
|
|
|
||
|
|
namespace Weak1 {
|
||
|
|
|
||
|
|
/// \brief ARC4 base class
|
||
|
|
/// \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
|
||
|
|
/// \since Crypto++ 3.1
|
||
|
|
class CRYPTOPP_NO_VTABLE ARC4_Base : public VariableKeyLength<16, 1, 256>, public RandomNumberGenerator, public SymmetricCipher, public SymmetricCipherDocumentation
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
~ARC4_Base();
|
||
|
|
|
||
|
|
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "ARC4";}
|
||
|
|
|
||
|
|
void GenerateBlock(byte *output, size_t size);
|
||
|
|
void DiscardBytes(size_t n);
|
||
|
|
|
||
|
|
void ProcessData(byte *outString, const byte *inString, size_t length);
|
||
|
|
|
||
|
|
bool IsRandomAccess() const {return false;}
|
||
|
|
bool IsSelfInverting() const {return true;}
|
||
|
|
bool IsForwardTransformation() const {return true;}
|
||
|
|
|
||
|
|
typedef SymmetricCipherFinal<ARC4_Base> Encryption;
|
||
|
|
typedef SymmetricCipherFinal<ARC4_Base> Decryption;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms);
|
||
|
|
virtual unsigned int GetDefaultDiscardBytes() const {return 0;}
|
||
|
|
|
||
|
|
FixedSizeSecBlock<byte, 256> m_state;
|
||
|
|
byte m_x, m_y;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// \brief Alleged RC4
|
||
|
|
/// \sa <a href="http://www.cryptopp.com/wiki/RC4">Alleged RC4</a>
|
||
|
|
/// \since Crypto++ 3.1
|
||
|
|
DOCUMENTED_TYPEDEF(SymmetricCipherFinal<ARC4_Base>, ARC4);
|
||
|
|
|
||
|
|
/// \brief MARC4 base class
|
||
|
|
/// \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
|
||
|
|
/// \details MARC4 discards the first 256 bytes of keystream, which may be weaker than the rest
|
||
|
|
/// \since Crypto++ 3.1
|
||
|
|
class CRYPTOPP_NO_VTABLE MARC4_Base : public ARC4_Base
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "MARC4";}
|
||
|
|
|
||
|
|
typedef SymmetricCipherFinal<MARC4_Base> Encryption;
|
||
|
|
typedef SymmetricCipherFinal<MARC4_Base> Decryption;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
unsigned int GetDefaultDiscardBytes() const {return 256;}
|
||
|
|
};
|
||
|
|
|
||
|
|
/// \brief Modified Alleged RC4
|
||
|
|
/// \sa <a href="http://www.cryptopp.com/wiki/RC4">Alleged RC4</a>
|
||
|
|
/// \since Crypto++ 3.1
|
||
|
|
DOCUMENTED_TYPEDEF(SymmetricCipherFinal<MARC4_Base>, MARC4);
|
||
|
|
|
||
|
|
}
|
||
|
|
#if CRYPTOPP_ENABLE_NAMESPACE_WEAK >= 1
|
||
|
|
namespace Weak {using namespace Weak1;} // import Weak1 into CryptoPP::Weak
|
||
|
|
#else
|
||
|
|
using namespace Weak1; // import Weak1 into CryptoPP with warning
|
||
|
|
#ifdef __GNUC__
|
||
|
|
#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."
|
||
|
|
#else
|
||
|
|
#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.")
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
NAMESPACE_END
|
||
|
|
|
||
|
|
#endif
|