BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/EPPlus/Utils/EncryptedPackageHandler.cs

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/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library 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 Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 **************************************************************************************
 * This class is created with the help of the MS-OFFCRYPTO PDF documentation... http://msdn.microsoft.com/en-us/library/cc313071(office.12).aspx
 * Decryption library for Office Open XML files(Lyquidity) and Sminks very nice example 
 * on "Reading compound documents in c#" on Stackoverflow. Many thanks!
 ***************************************************************************************
 * Code change notes:
 * 
 * Author							Change						Date
 *******************************************************************************
 * Jan Källman		Added		10-AUG-2010
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices; 
using comTypes=System.Runtime.InteropServices.ComTypes;
using System.IO;
using System.Security.Cryptography;
using System.IO.Packaging; 
namespace Zephyr.Utils.EPPlus.Utils
{
    /// <summary>
    /// Handles the EncryptionInfo stream
    /// </summary>
    internal class EncryptionInfo
    {
        internal short MajorVersion;
        internal short MinorVersion;
        internal Flags Flags;
        internal uint HeaderSize;
        internal EncryptionHeader Header;
        internal EncryptionVerifier Verifier;
        internal void ReadBinary(byte[] data)
        {
            MajorVersion = BitConverter.ToInt16(data, 0);
            MinorVersion = BitConverter.ToInt16(data, 2);