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diff --git a/external/crypto++-5.6.3/serpent.h b/external/crypto++-5.6.3/serpent.h
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+++ b/external/crypto++-5.6.3/serpent.h
@@ -0,0 +1,54 @@
+// serpent.h - written and placed in the public domain by Wei Dai
+
+//! \file serpent.h
+//! \brief Classes for the Serpent block cipher
+
+#ifndef CRYPTOPP_SERPENT_H
+#define CRYPTOPP_SERPENT_H
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! _
+struct Serpent_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 0, 32>, public FixedRounds<32>
+{
+	static const char *StaticAlgorithmName() {return "Serpent";}
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#Serpent">Serpent</a>
+class Serpent : public Serpent_Info, public BlockCipherDocumentation
+{
+	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<Serpent_Info>
+	{
+	public:
+		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
+
+	protected:
+		FixedSizeSecBlock<word32, 33*4> m_key;
+	};
+
+	class CRYPTOPP_NO_VTABLE Enc : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+	class CRYPTOPP_NO_VTABLE Dec : public Base
+	{
+	public:
+		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
+	};
+
+public:
+	typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
+	typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
+};
+
+typedef Serpent::Encryption SerpentEncryption;
+typedef Serpent::Decryption SerpentDecryption;
+
+NAMESPACE_END
+
+#endif