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diff --git a/libktorrent/mse/bigint.h b/libktorrent/mse/bigint.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 MSEBIGINT_H
+#define MSEBIGINT_H
+
+#include <qstring.h>
+#include <util/constants.h>
+#include <stdio.h>
+#include <gmp.h>
+
+using bt::Uint8;
+using bt::Uint16;
+using bt::Uint32;
+using bt::Uint64;
+
+namespace mse
+{
+
+	/**
+	 * @author Joris Guisson <joris.guisson@gmail.com>
+	 * 
+	 * Class which can hold an arbitrary large integer. This will be a very important part of our
+	 * MSE implementation.
+	*/
+	class BigInt
+	{
+	public:
+		/**
+		 * Create a big integer, with num_bits bits.
+		 * All bits will be set to 0.
+		 * @param num_bits The number of bits
+		 */
+		BigInt(Uint32 num_bits = 0);
+		
+		/**
+		 * Create a big integer of a string. The string must be
+		 * a hexadecimal representation of an integer. For example :
+		 * 12AFFE123488BBBE123
+		 * 
+		 * Letters can be upper or lower case. Invalid chars will create an invalid number.
+		 * @param value The hexadecimal representation of the number
+		 */
+		BigInt(const QString & value);
+		
+		/**
+		 * Copy constructor.
+		 * @param bi BigInt to copy
+		 */
+		BigInt(const BigInt & bi);
+		virtual ~BigInt();
+		
+		/**
+		 * Assignment operator.
+		 * @param bi The BigInt to copy
+		 * @return *this
+		 */
+		BigInt & operator = (const BigInt & bi);
+		
+		/**
+		 * Calculates
+		 * (x ^ e) mod d 
+		 * ^ is power
+		 */
+		static BigInt powerMod(const BigInt & x,const BigInt & e,const BigInt & d);
+		
+		/// Make a random BigInt
+		static BigInt random();
+		
+		/// Export the bigint ot a buffer
+		Uint32 toBuffer(Uint8* buf,Uint32 max_size) const;
+		
+		/// Make a BigInt out of a buffer
+		static BigInt fromBuffer(const Uint8* buf,Uint32 size);
+		
+	private:
+		mpz_t val;
+	};
+
+}
+
+#endif