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diff --git a/libktorrent/util/sha1hashgen.h b/libktorrent/util/sha1hashgen.h
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+++ b/libktorrent/util/sha1hashgen.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by Joris Guisson                                   *
+ *   joris.guisson@gmail.com                                               *
+ *                                                                         *
+ *   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 2 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, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.             *
+ ***************************************************************************/
+#ifndef BTSHA1HASHGEN_H
+#define BTSHA1HASHGEN_H
+
+#include "constants.h"
+#include "sha1hash.h"
+
+namespace bt
+{
+	
+	/**
+	 * @author Joris Guisson
+	 * 
+	 * Generates a SHA1 hash, code based on wikipedia's pseudocode
+	 * There are 2 ways to use this class :
+	 * - generate : all data is present from the start
+	 * - start, update and end : data can be delivered in chunks
+	 * 
+	 * Mixing the 2, is not a good idea
+	*/
+	class SHA1HashGen
+	{
+		Uint32 h0;
+		Uint32 h1;
+		Uint32 h2;
+		Uint32 h3;
+		Uint32 h4;
+		Uint8 tmp[64];
+		Uint32 tmp_len;
+		Uint32 total_len;
+	public:
+		SHA1HashGen();
+		~SHA1HashGen();
+
+		/**
+		 * Generate a hash from a bunch of data.
+		 * @param data The data
+		 * @param len The length
+		 * @return The SHA1 hash
+		 */
+		SHA1Hash generate(const Uint8* data,Uint32 len);
+		
+		/**
+		 * Start SHA1 hash generation in chunks.
+		 */
+		void start();
+		
+		/**
+		 * Update the hash.
+		 * @param data The data 
+		 * @param len Length of the data
+		 */
+		void update(const Uint8* data,Uint32 len);
+		
+		
+		/**
+		 * All data has been delivered, calculate the final hash. 
+		 * @return 
+		 */ 
+		void end();
+		
+		/**
+		 * Get the hash generated.
+		 */
+		SHA1Hash get() const;
+	private:
+		void processChunk(const Uint8* c);
+	};
+
+}
+
+#endif