BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/POIFS/Crypt/EncryptionHeader.cs

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */


using System;
using System.IO;
using System.Text;
using System.Xml;

using Zephyr.Utils.NPOI;
using Zephyr.Utils.NPOI.POIFS.FileSystem;


namespace Zephyr.Utils.NPOI.POIFS.Crypt
{
    public class EncryptionHeader
    {
        public const  int ALGORITHM_RC4 = 0x6801;
        public const int ALGORITHM_AES_128 = 0x660E;
        public const int ALGORITHM_AES_192 = 0x660F;
        public const int ALGORITHM_AES_256 = 0x6610;

        public const int HASH_SHA1 = 0x8004;

        public const int PROVIDER_RC4 = 1;
        public const int PROVIDER_AES = 0x18;

        public const int MODE_ECB = 1;
        public const int MODE_CBC = 2;
        public const int MODE_CFB = 3;

        private  int flags;
        private  int sizeExtra;
        private int algorithm;
        private int hashAlgorithm;
        private int keySize;
        private int providerType;
        private int cipherMode;
        private byte[] keySalt;
        private String cspName;

        public EncryptionHeader(DocumentInputStream dr)
        {
            flags = dr.ReadInt();
            sizeExtra = dr.ReadInt();
            algorithm = dr.ReadInt();