///////////////////////////////////////////////////////////////////////////////
// MuldeR's Utilities for Qt
// Copyright (C) 2004-2019 LoRd_MuldeR <MuldeR2@GMX.de>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// http://www.gnu.org/licenses/lgpl-2.1.txt
//////////////////////////////////////////////////////////////////////////////////

/***************************************************************************
**                                                                        **
**  QKeccakHash, an API wrapper bringing the optimized implementation of  **
**  Keccak (http://keccak.noekeon.org/) to Qt.                            **
**  Copyright (C) 2013 Emanuel Eichhammer                                 **
**                                                                        **
**  This program is free software: you can redistribute it and/or modify  **
**  it under the terms of the GNU General Public License as published by  **
**  the Free Software Foundation, either version 3 of the License, or     **
**  (at your option) any later version.                                   **
**                                                                        **
**  This program is distributed in the hope that it will be useful,       **
**  but WITHOUT ANY WARRANTY; without even the implied warranty of        **
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         **
**  GNU General Public License for more details.                          **
**                                                                        **
**  You should have received a copy of the GNU General Public License     **
**  along with this program.  If not, see http://www.gnu.org/licenses/.   **
**                                                                        **
****************************************************************************
**           Author: Emanuel Eichhammer                                   **
**  Website/Contact: http://www.WorksLikeClockwork.com/                   **
**             Date: 12.01.12                                             **
****************************************************************************/

#pragma once

//MUtils
#include <MUtils/Global.h>
#include <MUtils/Hash.h>

//Qt
#include <QString>
#include <QByteArray>
#include <QFile>

namespace MUtils
{
	namespace Hash
	{
		namespace Internal
		{
			// Section from KeccakSponge.h
			// needed here, since hashState needs to be explicitly 32-byte aligned and therefore can't be
			// transformed into a class (in order to forward declarate) like in the other hash wrappers.
			namespace KeccakImpl
			{
				#define KeccakPermutationSize 1600
				#define KeccakPermutationSizeInBytes (KeccakPermutationSize/8)
				#define KeccakMaximumRate 1536
				#define KeccakMaximumRateInBytes (KeccakMaximumRate/8)

				#if defined(__GNUC__)
				#define ALIGN __attribute__ ((aligned(32)))
				#elif defined(_MSC_VER)
				#define ALIGN __declspec(align(32))
				#else
				#define ALIGN
				#endif

				ALIGN typedef struct spongeStateStruct
				{
					ALIGN unsigned char state[KeccakPermutationSizeInBytes];
					ALIGN unsigned char dataQueue[KeccakMaximumRateInBytes];
					unsigned int rate;
					unsigned int capacity;
					unsigned int bitsInQueue;
					unsigned int fixedOutputLength;
					int squeezing;
					unsigned int bitsAvailableForSqueezing;
				}
				spongeState;
				typedef spongeState hashState;
			}
			// End Section from KeccakSponge.h
		}

		class MUTILS_API Keccak : public Hash
		{
		public:
			enum HashBits {hb224, hb256, hb384, hb512};
		
			Keccak();
			virtual ~Keccak();
		
			bool init(const HashBits hashBits=hb256);

			static Keccak *create(const HashBits hashBits = hb256, const char *const key = NULL);
			static bool selfTest(void);

		protected:
			bool m_initialized;
			Internal::KeccakImpl::hashState *m_state;

			virtual bool process(const quint8 *const data, const quint32 len);
			virtual QByteArray finalize(void);
		};
	}
};
