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diff --git a/external/crypto++-5.6.3/eax.h b/external/crypto++-5.6.3/eax.h
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+++ b/external/crypto++-5.6.3/eax.h
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+// eax.h - written and placed in the public domain by Wei Dai
+
+//! \file
+//! \headerfile eax.h
+//! \brief EAX block cipher mode of operation
+
+#ifndef CRYPTOPP_EAX_H
+#define CRYPTOPP_EAX_H
+
+#include "authenc.h"
+#include "modes.h"
+#include "cmac.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \class EAX_Base
+//! \brief EAX block cipher mode of operation
+//! \details Implementations and overrides in \p EAX_Base apply to both \p ENCRYPTION and \p DECRYPTION directions
+class CRYPTOPP_NO_VTABLE EAX_Base : public AuthenticatedSymmetricCipherBase
+{
+public:
+	// AuthenticatedSymmetricCipher
+	std::string AlgorithmName() const
+		{return GetMAC().GetCipher().AlgorithmName() + std::string("/EAX");}
+	size_t MinKeyLength() const
+		{return GetMAC().MinKeyLength();}
+	size_t MaxKeyLength() const
+		{return GetMAC().MaxKeyLength();}
+	size_t DefaultKeyLength() const
+		{return GetMAC().DefaultKeyLength();}
+	size_t GetValidKeyLength(size_t n) const
+		{return GetMAC().GetValidKeyLength(n);}
+	bool IsValidKeyLength(size_t n) const
+		{return GetMAC().IsValidKeyLength(n);}
+	unsigned int OptimalDataAlignment() const
+		{return GetMAC().OptimalDataAlignment();}
+	IV_Requirement IVRequirement() const
+		{return UNIQUE_IV;}
+	unsigned int IVSize() const
+		{return GetMAC().TagSize();}
+	unsigned int MinIVLength() const
+		{return 0;}
+	unsigned int MaxIVLength() const
+		{return UINT_MAX;}
+	unsigned int DigestSize() const
+		{return GetMAC().TagSize();}
+	lword MaxHeaderLength() const
+		{return LWORD_MAX;}
+	lword MaxMessageLength() const
+		{return LWORD_MAX;}
+
+protected:
+	// AuthenticatedSymmetricCipherBase
+	bool AuthenticationIsOnPlaintext() const
+		{return false;}
+	unsigned int AuthenticationBlockSize() const
+		{return 1;}
+	void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs &params);
+	void Resync(const byte *iv, size_t len);
+	size_t AuthenticateBlocks(const byte *data, size_t len);
+	void AuthenticateLastHeaderBlock();
+	void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
+	SymmetricCipher & AccessSymmetricCipher() {return m_ctr;}
+	const CMAC_Base & GetMAC() const {return const_cast<EAX_Base *>(this)->AccessMAC();}
+	virtual CMAC_Base & AccessMAC() =0;
+
+	CTR_Mode_ExternalCipher::Encryption m_ctr;
+};
+
+//! \class EAX_Final
+//! \brief Class specific methods used to operate the cipher.
+//! \tparam T_BlockCipher block cipher
+//! \tparam T_IsEncryption direction in which to operate the cipher
+//! \details Implementations and overrides in \p GCM_Final apply to either
+//!   \p ENCRYPTION or \p DECRYPTION, depending on the template parameter \p T_IsEncryption.
+//! \details \p EAX_Final does not use inner classes \p Enc and \p Dec.
+template <class T_BlockCipher, bool T_IsEncryption>
+class EAX_Final : public EAX_Base
+{
+public:
+	static std::string StaticAlgorithmName()
+		{return T_BlockCipher::StaticAlgorithmName() + std::string("/EAX");}
+	bool IsForwardTransformation() const
+		{return T_IsEncryption;}
+
+private:
+	CMAC_Base & AccessMAC() {return m_cmac;}
+	CMAC<T_BlockCipher> m_cmac;
+};
+
+#ifdef EAX	// EAX is defined to 11 on GCC 3.4.3, OpenSolaris 8.11
+#undef EAX
+#endif
+
+//! \class EAX
+//! \brief The EAX block cipher mode of operation
+//! \details EAX is an Authenticated Encryption with Associated Data (AEAD) block
+//!   cipher mode of operation designed to simultaneously provide both authentication
+//!   and privacy of the message.
+//! \tparam T_BlockCipher block cipher
+//! \details \p EAX provides the \p Encryption and \p Decryption typedef.
+//! \sa <a href="http://www.cryptolounge.org/wiki/EAX">EAX</a> at the Crypto Lounge
+template <class T_BlockCipher>
+struct EAX : public AuthenticatedSymmetricCipherDocumentation
+{
+	typedef EAX_Final<T_BlockCipher, true> Encryption;
+	typedef EAX_Final<T_BlockCipher, false> Decryption;
+};
+
+NAMESPACE_END
+
+#endif