source: branches/eraser6/DefaultPlugins/EraseDoD.cs @ 956

/* 
 * $Id$
 * Copyright 2008 The Eraser Project
 * Original Author: Joel Low <lowjoel@users.sourceforge.net>
 * Modified By:
 * 
 * This file is part of Eraser.
 * 
 * Eraser 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.
 * 
 * Eraser 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.
 * 
 * A copy of the GNU General Public License can be found at
 * <http://www.gnu.org/licenses/>.
 */

using System;
using System.Collections.Generic;
using System.Text;
using Eraser.Manager;
using Eraser.Util;

namespace Eraser.DefaultPlugins
{
    class DoD_EcE : PassBasedErasureMethod
    {
        public override string Name
        {
            get { return S._("US DoD 5220.22-M (8-306./E, C & E)"); }
        }

        public override Guid Guid
        {
            get { return new Guid("{D1583631-702E-4dbf-A0E9-C35DBA481702}"); }
        }

        protected override bool RandomizePasses
        {
            get { return false; }
        }

        protected override ErasureMethodPass[] PassesSet
        {
            get
            {
                //Set passes 1, 4 and 5 to be a random value
                Prng prng = PrngManager.GetInstance(ManagerLibrary.Settings.ActivePrng);
                int rand = prng.Next();

                ErasureMethodPass[] result = new ErasureMethodPass[]
                {
                    new ErasureMethodPass(WriteConstant, new byte[] { (byte)(rand & 0xFF) }),
                    new ErasureMethodPass(WriteConstant, new byte[] { 0 }),
                    new ErasureMethodPass(WriteRandom, null),
                    new ErasureMethodPass(WriteConstant, new byte[] { (byte)((rand >> 8) & 0xFF) }),
                    new ErasureMethodPass(WriteConstant, new byte[] { (byte)((rand >> 16) & 0xFF) }),
                    new ErasureMethodPass(WriteConstant, new byte[] { 0 }),
                    new ErasureMethodPass(WriteRandom, null)
                };

                //Set passes 2 and 6 to be complements of 1 and 5
                result[1] = new ErasureMethodPass(WriteConstant, new byte[] {
                    (byte)(~((byte[])result[0].OpaqueValue)[0]) });
                result[5] = new ErasureMethodPass(WriteConstant, new byte[] {
                    (byte)(~((byte[])result[4].OpaqueValue)[0]) });
                return result;
            }
        }
    }

    class DoD_E : PassBasedErasureMethod
    {
        public override string Name
        {
            get { return S._("US DoD 5220.22-M (8-306./E)"); }
        }

        public override Guid Guid
        {
            get { return new Guid("{ECBF4998-0B4F-445c-9A06-23627659E419}"); }
        }

        protected override bool RandomizePasses
        {
            get { return false; }
        }

        protected override ErasureMethodPass[] PassesSet
        {
            get
            {
                return new ErasureMethodPass[]
                {
                    new ErasureMethodPass(WriteConstant, new byte[] { 0 }),
                    new ErasureMethodPass(WriteConstant, new byte[] { 0xFF }),
                    new ErasureMethodPass(WriteRandom, null)
                };
            }
        }
    }
}