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diff --git a/external/crypto++-5.6.3/dsa.h b/external/crypto++-5.6.3/dsa.h
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+++ b/external/crypto++-5.6.3/dsa.h
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+// dsa.h - written and placed in the public domain by Wei Dai
+
+//! \file dsa.h
+//! \brief Classes for the DSA signature algorithm
+
+#ifndef CRYPTOPP_DSA_H
+#define CRYPTOPP_DSA_H
+
+#include "cryptlib.h"
+#include "gfpcrypt.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \brief DSA Signature Format
+//! \details The DSA signature format used by Crypto++ is as defined by IEEE P1363.
+//!   Java nad .Net use the DER format, and OpenPGP uses the OpenPGP format.
+enum DSASignatureFormat {
+	//! \brief Crypto++ native signature encoding format
+	DSA_P1363,
+	//! \brief signature encoding format used by Java and .Net
+	DSA_DER,
+	//! \brief OpenPGP signature encoding format
+	DSA_OPENPGP
+};
+
+//! \brief Converts between signature encoding formats
+//! \param buffer byte buffer for the converted signature encoding
+//! \param bufferSize the length of the converted signature encoding buffer
+//! \param toFormat the source signature format
+//! \param signature byte buffer for the existing signature encoding
+//! \param signatureLen the length of the existing signature encoding buffer
+//! \param fromFormat the source signature format
+//! \details This function converts between these formats, and returns length
+//!   of signature in the target format. If <tt>toFormat == DSA_P1363</tt>, then
+//!   <tt>bufferSize</tt> must equal <tt>publicKey.SignatureLength()</tt>
+size_t DSAConvertSignatureFormat(byte *buffer, size_t bufferSize, DSASignatureFormat toFormat, 
+	const byte *signature, size_t signatureLen, DSASignatureFormat fromFormat);
+
+NAMESPACE_END
+
+#endif