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+//
+// ECDSADigestEngine.h
+//
+//
+// Library: Crypto
+// Package: ECDSA
+// Module:  ECDSADigestEngine
+//
+// Definition of the ECDSADigestEngine class.
+//
+// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Crypto_ECDSADigestEngine_INCLUDED
+#define Crypto_ECDSADigestEngine_INCLUDED
+
+
+#include "Poco/Crypto/Crypto.h"
+#include "Poco/Crypto/ECKey.h"
+#include "Poco/DigestEngine.h"
+#include "Poco/Crypto/DigestEngine.h"
+#include <istream>
+#include <ostream>
+
+
+namespace Poco {
+namespace Crypto {
+
+
+class Crypto_API ECDSADigestEngine: public Poco::DigestEngine
+	/// This class implements a Poco::DigestEngine that can be
+	/// used to compute a secure digital signature.
+	///
+	/// First another Poco::Crypto::DigestEngine is created and
+	/// used to compute a cryptographic hash of the data to be
+	/// signed. Then, the hash value is encrypted, using
+	/// the ECDSA private key.
+	///
+	/// To verify a signature, pass it to the verify() 
+	/// member function. It will decrypt the signature
+	/// using the ECDSA public key and compare the resulting
+	/// hash with the actual hash of the data.
+{
+public:
+
+	ECDSADigestEngine(const ECKey& key, const std::string &name);
+		/// Creates the ECDSADigestEngine with the given ECDSA key,
+		/// using the hash algorithm with the given name
+		/// (e.g., "SHA1", "SHA256", "SHA512", etc.).
+		/// See the OpenSSL documentation for a list of supported digest algorithms.
+		///
+		/// Throws a Poco::NotFoundException if no algorithm with the given name exists.
+
+	~ECDSADigestEngine();
+		/// Destroys the ECDSADigestEngine.
+
+	std::size_t digestLength() const;
+		/// Returns the length of the digest in bytes.
+
+	void reset();
+		/// Resets the engine so that a new
+		/// digest can be computed.
+		
+	const DigestEngine::Digest& digest();
+		/// Finishes the computation of the digest 
+		/// (the first time it's called) and
+		/// returns the message digest. 
+		///
+		/// Can be called multiple times.
+
+	const DigestEngine::Digest& signature();
+		/// Signs the digest using the ECDSADSA algorithm
+		/// and the private key (the first time it's
+		/// called) and returns the result.
+		///
+		/// Can be called multiple times.
+
+	bool verify(const DigestEngine::Digest& signature);
+		/// Verifies the data against the signature.
+		///
+		/// Returns true if the signature can be verified, false otherwise.
+
+protected:
+	void updateImpl(const void* data, std::size_t length);
+
+private:
+	ECKey _key;
+	Poco::Crypto::DigestEngine _engine;
+	Poco::DigestEngine::Digest _digest;
+	Poco::DigestEngine::Digest _signature;
+};
+
+
+} } // namespace Poco::Crypto
+
+
+#endif // Crypto_ECDSADigestEngine_INCLUDED