/* ==================================================================== 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.IO; using HH.WMS.Utils.NPOI.POIFS.FileSystem; using System.Text; using System.Xml; namespace HH.WMS.Utils.NPOI.POIFS.Crypt { public class EncryptionInfo { private int versionMajor; private int versionMinor; private int encryptionFlags; private EncryptionHeader header; private EncryptionVerifier verifier; public EncryptionInfo(POIFSFileSystem fs) : this(fs.Root) { } public EncryptionInfo(NPOIFSFileSystem fs) : this(fs.Root) { } public EncryptionInfo(DirectoryNode dir) { DocumentInputStream dis = dir.CreateDocumentInputStream("EncryptionInfo"); versionMajor = dis.ReadShort(); versionMinor = dis.ReadShort(); encryptionFlags = dis.ReadInt(); if (versionMajor == 4 && versionMinor == 4 && encryptionFlags == 0x40) { StringBuilder builder = new StringBuilder(); byte[] xmlDescriptor = new byte[dis.Available()]; dis.Read(xmlDescriptor); foreach (byte b in xmlDescriptor) builder.Append((char)b); string descriptor = builder.ToString(); header = new EncryptionHeader(descriptor); verifier = new EncryptionVerifier(descriptor); } else { int hSize = dis.ReadInt(); header = new EncryptionHeader(dis); if (header.Algorithm == EncryptionHeader.ALGORITHM_RC4) { verifier = new EncryptionVerifier(dis, 20); } else { verifier = new EncryptionVerifier(dis, 32); } } } public int VersionMajor { get { return versionMajor; } } public int VersionMinor { get { return versionMinor; } } public int EncryptionFlags { get { return encryptionFlags; } } public EncryptionHeader Header { get { return header; } } public EncryptionVerifier Verifier { get { return verifier; } } } }