Add SHA3 and BLAKE2 hashing algorithm

Foundation/include/Poco/BLAKE2Engine.h

@@ -0,0 +1,68 @@
+//
+// BLAKE2Engine.h
+//
+// Library: Foundation
+// Package: Crypt
+// Module:  BLAKE2Engine
+//
+// Definition of class BLAKE2Engine.
+//
+// This class implements the BLAKE2 hashing algorithm.
+// (RFC 7693, see https://tools.ietf.org/html/rfc7693)
+//
+// Based on the BLAKE2 reference implementation (CC0, OpenSSL or Apache 2.0)
+// http://creativecommons.org/publicdomain/zero/1.0
+// https://www.openssl.org/source/license.html
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Copyright (c) 2017, Applied Informatics Software Engineering GmbH
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+#ifndef Foundation_BLAKE2Engine_INCLUDED
+#define Foundation_BLAKE2Engine_INCLUDED
+
+#include "Poco/Foundation.h"
+#include "Poco/DigestEngine.h"
+
+namespace Poco {
+
+class Foundation_API BLAKE2Engine: public DigestEngine
+	/// This class implements the BLAKE2 hashing algorithm.
+	/// (RFC 7693, see https://tools.ietf.org/html/rfc7693)
+{
+public:
+	enum ALGORITHM
+	{
+		BLAKE2b_224 = 224,
+		BLAKE2b_256 = 256,
+		BLAKE2b_384 = 384,
+		BLAKE2b_512 = 512
+	};
+
+	BLAKE2Engine(ALGORITHM algorithm = BLAKE2b_512);
+	~BLAKE2Engine();
+		
+	std::size_t digestLength() const;
+	void reset();
+	const DigestEngine::Digest& digest();
+
+protected:
+	void updateImpl(const void* data, std::size_t length);
+
+private:
+	void transform();
+
+	void* _context;
+	ALGORITHM _algorithm;
+	DigestEngine::Digest _digest;
+
+	BLAKE2Engine(const BLAKE2Engine&);
+	BLAKE2Engine& operator = (const BLAKE2Engine&);
+};
+
+} // namespace Poco
+
+#endif // Foundation_BLAKE2Engine_INCLUDED