Add SHA3 and BLAKE2 hashing algorithm

Foundation/include/Poco/SHA3Engine.h

@@ -0,0 +1,66 @@
+//
+// SHA3Engine.h
+//
+// Library: Foundation
+// Package: Crypt
+// Module:  SHA3Engine
+//
+// Definition of class SHA3Engine.
+//
+/// This class implements the SHA-3 message digest algorithm.
+/// (FIPS 202, see http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf)
+//
+// Based on the Keccak Code Package (public domain)
+// https://github.com/gvanas/KeccakCodePackage
+//
+// Copyright (c) 2017, Applied Informatics Software Engineering GmbH
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+#ifndef Foundation_SHA3Engine_INCLUDED
+#define Foundation_SHA3Engine_INCLUDED
+
+#include "Poco/Foundation.h"
+#include "Poco/DigestEngine.h"
+
+namespace Poco {
+
+class Foundation_API SHA3Engine: public DigestEngine
+	/// This class implements the SHA-3 message digest algorithm.
+	/// (FIPS 202, see http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf)
+{
+public:
+	enum ALGORITHM
+	{
+		SHA3_224 = 224,
+		SHA3_256 = 256,
+		SHA3_384 = 384,
+		SHA3_512 = 512,
+	};
+
+	SHA3Engine(ALGORITHM algorithm = SHA3_512);
+	~SHA3Engine();
+		
+	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;
+
+	SHA3Engine(const SHA3Engine&);
+	SHA3Engine& operator = (const SHA3Engine&);
+};
+
+} // namespace Poco
+
+#endif // Foundation_SHA3Engine_INCLUDED