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-rw-r--r--CryptoPP/arc4.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/CryptoPP/arc4.h b/CryptoPP/arc4.h
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+++ b/CryptoPP/arc4.h
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+#ifndef CRYPTOPP_ARC4_H
+#define CRYPTOPP_ARC4_H
+
+#include "strciphr.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+namespace Weak1 {
+
+//! _
+class CRYPTOPP_NO_VTABLE ARC4_Base : public VariableKeyLength<16, 1, 256>, public RandomNumberGenerator, public SymmetricCipher, public SymmetricCipherDocumentation
+{
+public:
+ ~ARC4_Base();
+
+ static 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 &params);
+ virtual unsigned int GetDefaultDiscardBytes() const {return 0;}
+
+ FixedSizeSecBlock<byte, 256> m_state;
+ byte m_x, m_y;
+};
+
+//! <a href="http://www.weidai.com/scan-mirror/cs.html#RC4">Alleged RC4</a>
+DOCUMENTED_TYPEDEF(SymmetricCipherFinal<ARC4_Base>, ARC4)
+
+//! _
+class CRYPTOPP_NO_VTABLE MARC4_Base : public ARC4_Base
+{
+public:
+ static const char *StaticAlgorithmName() {return "MARC4";}
+
+ typedef SymmetricCipherFinal<MARC4_Base> Encryption;
+ typedef SymmetricCipherFinal<MARC4_Base> Decryption;
+
+protected:
+ unsigned int GetDefaultDiscardBytes() const {return 256;}
+};
+
+//! Modified ARC4: it discards the first 256 bytes of keystream which may be weaker than the rest
+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