E3.CSharpZipLib/Encryption/PkzipClassic.cs

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//
// PkzipClassic encryption
//
// Copyright 2004 John Reilly
//
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library.  Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
// 
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent
// modules, and to copy and distribute the resulting executable under
// terms of your choice, provided that you also meet, for each linked
// independent module, the terms and conditions of the license of that
// module.  An independent module is a module which is not derived from
// or based on this library.  If you modify this library, you may extend
// this exception to your version of the library, but you are not
// obligated to do so.  If you do not wish to do so, delete this
// exception statement from your version.
//


#if !NETCF_1_0

using System;
using System.Security.Cryptography;
using E3.CSharpZipLib.Checksums;

namespace E3.CSharpZipLib.Encryption
{
	/// <summary>
	/// PkzipClassic embodies the classic or original encryption facilities used in Pkzip archives.
	/// While it has been superceded by more recent and more powerful algorithms, its still in use and 
	/// is viable for preventing casual snooping
	/// </summary>
	public abstract class PkzipClassic : SymmetricAlgorithm
	{
		/// <summary>
		/// Generates new encryption keys based on given seed
		/// </summary>
		/// <param name="seed">The seed value to initialise keys with.</param>
		/// <returns>A new key value.</returns>
		static public byte[] GenerateKeys(byte[] seed)
		{