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/*
 * Copyright (C) 2007-2010 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef SHA1_H
#define SHA1_H

#include <stdint.h>
#include "bu/cryptohash.h"

namespace Bu
{
	/**
	 * Calculates SHA-1 sums.  This is based strongly on code from Michael D.
	 * Leonhard who released his code under the terms of the MIT license,
	 * thank you!  Check out his website http://tamale.net he has a lot of
	 * cool stuff there.
	 */
	class Sha1 : public CryptoHash
	{
	public:
		Sha1();
		~Sha1();

		virtual void reset();
		virtual void setSalt( const Bu::String &sSalt );
		virtual void addData( const void *sData, int iSize );
		using CryptoHash::addData;
		virtual String getResult();
		virtual void writeResult( Stream &sOut );

		void update( const char* data, int num );
		unsigned char* getDigest();

		// utility methods

	private:
		static uint32_t lrot( uint32_t x, int bits );
		static void toBigEndian( uint32_t in, unsigned char* out );
		void process();
	
	private:
		uint32_t uH0, uH1, uH2, uH3, uH4;
		unsigned char uBytes[64];
		int iUnprocessedBytes;
		uint32_t uTotalBytes;
	};
};

#endif