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diff --git a/external/crypto++-5.6.3/emsa2.h b/external/crypto++-5.6.3/emsa2.h
new file mode 100644
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+++ b/external/crypto++-5.6.3/emsa2.h
@@ -0,0 +1,88 @@
+// emsa2.h - written and placed in the public domain by Wei Dai
+
+//! \file emsa2.h
+//! \brief Classes and functions for various padding schemes used in public key algorithms
+
+#ifndef CRYPTOPP_EMSA2_H
+#define CRYPTOPP_EMSA2_H
+
+#include "cryptlib.h"
+#include "pubkey.h"
+#include "misc.h"
+
+#ifdef CRYPTOPP_IS_DLL
+#include "sha.h"
+#endif
+
+NAMESPACE_BEGIN(CryptoPP)
+
+template <class H> class EMSA2HashId
+{
+public:
+	static const byte id;
+};
+
+template <class BASE>
+class EMSA2HashIdLookup : public BASE
+{
+public:
+	struct HashIdentifierLookup
+	{
+		template <class H> struct HashIdentifierLookup2
+		{
+			static HashIdentifier Lookup()
+			{
+				return HashIdentifier(&EMSA2HashId<H>::id, 1);
+			}
+		};
+	};
+};
+
+// EMSA2HashId can be instantiated with the following classes.
+class SHA1;
+class RIPEMD160;
+class RIPEMD128;
+class SHA256;
+class SHA384;
+class SHA512;
+class Whirlpool;
+class SHA224;
+// end of list
+
+#ifdef CRYPTOPP_IS_DLL
+CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA1>;
+CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA224>;
+CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA256>;
+CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA384>;
+CRYPTOPP_DLL_TEMPLATE_CLASS EMSA2HashId<SHA512>;
+#endif
+
+//! _
+class CRYPTOPP_DLL EMSA2Pad : public EMSA2HashIdLookup<PK_DeterministicSignatureMessageEncodingMethod>
+{
+public:
+	static const char * CRYPTOPP_API StaticAlgorithmName() {return "EMSA2";}
+	
+	size_t MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const
+		{CRYPTOPP_UNUSED(hashIdentifierLength); return 8*digestLength + 31;}
+
+	void ComputeMessageRepresentative(RandomNumberGenerator &rng, 
+		const byte *recoverableMessage, size_t recoverableMessageLength,
+		HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+		byte *representative, size_t representativeBitLength) const;
+};
+
+//! EMSA2, for use with RWSS and RSA_ISO
+/*! Only the following hash functions are supported by this signature standard:
+	\dontinclude emsa2.h
+	\skip EMSA2HashId can be instantiated
+	\until end of list
+*/
+struct P1363_EMSA2 : public SignatureStandard
+{
+	typedef EMSA2Pad SignatureMessageEncodingMethod;
+};
+
+NAMESPACE_END
+
+#endif