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diff --git a/external/crypto++-5.6.3/arc4.h b/external/crypto++-5.6.3/arc4.h
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+++ b/external/crypto++-5.6.3/arc4.h
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+// arc4.h - written and placed in the public domain by Wei Dai
+
+//! \file arc4.h
+//! \brief Classes for ARC4 cipher
+
+#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 {
+
+//! \class ARC4_Base
+//! \brief Class specific methods used to operate the cipher.
+//! \details Implementations and overrides in \p Base apply to both \p ENCRYPTION and \p DECRYPTION directions
+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 MARC4_Base
+//! \brief Class specific methods used to operate the cipher.
+//! \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
+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;}
+};
+
+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