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diff --git a/external/crypto++-5.6.3/rc5.h b/external/crypto++-5.6.3/rc5.h
new file mode 100644
index 0000000..ba5d968
--- /dev/null
+++ b/external/crypto++-5.6.3/rc5.h
@@ -0,0 +1,56 @@
+// rc5.h - written and placed in the public domain by Wei Dai
+
+//! \file rc5.h
+//! \brief Classes for the RC5 block cipher
+
+#ifndef CRYPTOPP_RC5_H
+#define CRYPTOPP_RC5_H
+
+#include "seckey.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! _
+struct RC5_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 0, 255>, public VariableRounds<16>
+{
+	static const char *StaticAlgorithmName() {return "RC5";}
+	typedef word32 RC5_WORD;
+};
+
+/// <a href="http://www.weidai.com/scan-mirror/cs.html#RC5">RC5</a>
+class RC5 : public RC5_Info, public BlockCipherDocumentation
+{
+	class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<RC5_Info>
+	{
+	public:
+		void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
+
+	protected:
+		unsigned int r;       // number of rounds
+		SecBlock<RC5_WORD> sTable;  // expanded key table
+	};
+
+	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 RC5::Encryption RC5Encryption;
+typedef RC5::Decryption RC5Decryption;
+
+NAMESPACE_END
+
+#endif