/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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using System.IO;
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using HH.WMS.Utils.NPOI.POIFS.FileSystem;
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using System.Text;
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using System.Xml;
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namespace HH.WMS.Utils.NPOI.POIFS.Crypt
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{
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public class EncryptionInfo
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{
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private int versionMajor;
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private int versionMinor;
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private int encryptionFlags;
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private EncryptionHeader header;
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private EncryptionVerifier verifier;
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public EncryptionInfo(POIFSFileSystem fs)
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: this(fs.Root)
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{
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}
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public EncryptionInfo(NPOIFSFileSystem fs)
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: this(fs.Root)
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{
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}
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public EncryptionInfo(DirectoryNode dir)
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{
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DocumentInputStream dis = dir.CreateDocumentInputStream("EncryptionInfo");
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versionMajor = dis.ReadShort();
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versionMinor = dis.ReadShort();
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encryptionFlags = dis.ReadInt();
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if (versionMajor == 4 && versionMinor == 4 && encryptionFlags == 0x40)
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{
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StringBuilder builder = new StringBuilder();
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byte[] xmlDescriptor = new byte[dis.Available()];
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dis.Read(xmlDescriptor);
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foreach (byte b in xmlDescriptor)
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builder.Append((char)b);
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string descriptor = builder.ToString();
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header = new EncryptionHeader(descriptor);
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verifier = new EncryptionVerifier(descriptor);
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}
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else
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{
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int hSize = dis.ReadInt();
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header = new EncryptionHeader(dis);
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if (header.Algorithm == EncryptionHeader.ALGORITHM_RC4)
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{
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verifier = new EncryptionVerifier(dis, 20);
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}
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else
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{
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verifier = new EncryptionVerifier(dis, 32);
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}
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}
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}
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public int VersionMajor
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{
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get
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{
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return versionMajor;
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}
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}
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public int VersionMinor
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{
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get
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{
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return versionMinor;
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}
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}
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public int EncryptionFlags
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{
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get
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{
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return encryptionFlags;
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}
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}
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public EncryptionHeader Header
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{
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get
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{
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return header;
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}
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}
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public EncryptionVerifier Verifier
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{
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get
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{
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return verifier;
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}
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}
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}
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}
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