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+//
+// DigestEngine.h
+//
+// Library: Crypto
+// Package: Digest
+// Module:  DigestEngine
+//
+// Definition of the DigestEngine class.
+//
+// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Crypto_DigestEngine_INCLUDED
+#define Crypto_DigestEngine_INCLUDED
+
+
+#include "Poco/Crypto/Crypto.h"
+#include "Poco/Crypto/OpenSSLInitializer.h"
+#include "Poco/DigestEngine.h"
+#include <openssl/evp.h>
+
+
+namespace Poco {
+namespace Crypto {
+
+
+class Crypto_API DigestEngine: public Poco::DigestEngine
+	/// This class implements a Poco::DigestEngine for all
+	/// digest algorithms supported by OpenSSL.
+{
+public:
+	DigestEngine(const std::string& name);
+		/// Creates a DigestEngine using the digest with the given name
+		/// (e.g., "MD5", "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.
+		
+	~DigestEngine();
+		/// Destroys the DigestEngine.
+	
+	const std::string& algorithm() const;
+		/// Returns the name of the digest algorithm.
+	
+	int nid() const;
+		/// Returns the NID (OpenSSL object identifier) of the digest algorithm.
+
+	// DigestEngine
+	std::size_t digestLength() const;
+	void reset();
+	const Poco::DigestEngine::Digest& digest();
+
+protected:
+	void updateImpl(const void* data, std::size_t length);
+	
+private:
+	std::string _name;
+	EVP_MD_CTX* _pContext;
+	Poco::DigestEngine::Digest _digest;
+	OpenSSLInitializer _openSSLInitializer;
+};
+
+
+//
+// inlines
+//
+inline const std::string& DigestEngine::algorithm() const
+{
+	return _name;
+}
+
+
+} } // namespace Poco::Crypto
+
+
+#endif // Crypto_DigestEngine_INCLUDED