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diff --git a/external/crypto++-5.6.3/authenc.h b/external/crypto++-5.6.3/authenc.h
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+++ b/external/crypto++-5.6.3/authenc.h
@@ -0,0 +1,57 @@
+// authenc.h - written and placed in the public domain by Wei Dai
+
+//! \file
+//! \headerfile authenc.h
+//! \brief Base classes for working with authenticated encryption modes of encryption
+
+#ifndef CRYPTOPP_AUTHENC_H
+#define CRYPTOPP_AUTHENC_H
+
+#include "cryptlib.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \class AuthenticatedSymmetricCipherBase
+//! \brief 
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AuthenticatedSymmetricCipherBase : public AuthenticatedSymmetricCipher
+{
+public:
+	AuthenticatedSymmetricCipherBase() : m_state(State_Start), m_bufferedDataLength(0),
+		m_totalHeaderLength(0), m_totalMessageLength(0), m_totalFooterLength(0) {}
+
+	bool IsRandomAccess() const {return false;}
+	bool IsSelfInverting() const {return true;}
+	void UncheckedSetKey(const byte *,unsigned int,const CryptoPP::NameValuePairs &) {assert(false);}
+
+	void SetKey(const byte *userKey, size_t keylength, const NameValuePairs &params);
+	void Restart() {if (m_state > State_KeySet) m_state = State_KeySet;}
+	void Resynchronize(const byte *iv, int length=-1);
+	void Update(const byte *input, size_t length);
+	void ProcessData(byte *outString, const byte *inString, size_t length);
+	void TruncatedFinal(byte *mac, size_t macSize);
+
+protected:
+	void AuthenticateData(const byte *data, size_t len);
+	const SymmetricCipher & GetSymmetricCipher() const {return const_cast<AuthenticatedSymmetricCipherBase *>(this)->AccessSymmetricCipher();};
+
+	virtual SymmetricCipher & AccessSymmetricCipher() =0;
+	virtual bool AuthenticationIsOnPlaintext() const =0;
+	virtual unsigned int AuthenticationBlockSize() const =0;
+	virtual void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params) =0;
+	virtual void Resync(const byte *iv, size_t len) =0;
+	virtual size_t AuthenticateBlocks(const byte *data, size_t len) =0;
+	virtual void AuthenticateLastHeaderBlock() =0;
+	virtual void AuthenticateLastConfidentialBlock() {}
+	virtual void AuthenticateLastFooterBlock(byte *mac, size_t macSize) =0;
+
+	enum State {State_Start, State_KeySet, State_IVSet, State_AuthUntransformed, State_AuthTransformed, State_AuthFooter};
+	State m_state;
+	unsigned int m_bufferedDataLength;
+	lword m_totalHeaderLength, m_totalMessageLength, m_totalFooterLength;
+	AlignedSecByteBlock m_buffer;
+};
+
+NAMESPACE_END
+
+#endif