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/* ====================================================================
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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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namespace HH.WMS.Utils.NPOI.HSSF.Record
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{
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using System;
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using System.Text;
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using HH.WMS.Utils.NPOI.Util;
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/**
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* Title: File Pass Record
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* Description: Indicates that the record after this record are encrypted. HSSF does not support encrypted excel workbooks
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* and the presence of this record will cause Processing to be aborted.
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* REFERENCE: PG 420 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)
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* @author Jason Height (jheight at chariot dot net dot au)
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* @version 3.0-pre
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*/
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public class FilePassRecord
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: StandardRecord
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{
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public const short sid = 0x2F;
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private int _encryptionType;
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private int _encryptionInfo;
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private int _minorVersionNo;
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private byte[] _docId;
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private byte[] _saltData;
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private byte[] _saltHash;
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private const int ENCRYPTION_XOR = 0;
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private const int ENCRYPTION_OTHER = 1;
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private const int ENCRYPTION_OTHER_RC4 = 1;
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private const int ENCRYPTION_OTHER_CAPI_2 = 2;
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private const int ENCRYPTION_OTHER_CAPI_3 = 3;
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public FilePassRecord()
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{
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}
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public FilePassRecord(RecordInputStream in1)
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{
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_encryptionType = in1.ReadUShort();
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switch (_encryptionType)
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{
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case ENCRYPTION_XOR:
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throw new RecordFormatException("HSSF does not currently support XOR obfuscation");
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case ENCRYPTION_OTHER:
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// handled below
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break;
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default:
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throw new RecordFormatException("Unknown encryption type " + _encryptionType);
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}
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_encryptionInfo = in1.ReadUShort();
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switch (_encryptionInfo)
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{
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case ENCRYPTION_OTHER_RC4:
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// handled below
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break;
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case ENCRYPTION_OTHER_CAPI_2:
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case ENCRYPTION_OTHER_CAPI_3:
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throw new RecordFormatException(
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"HSSF does not currently support CryptoAPI encryption");
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default:
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throw new RecordFormatException("Unknown encryption info " + _encryptionInfo);
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}
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_minorVersionNo = in1.ReadUShort();
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if (_minorVersionNo != 1)
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{
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throw new RecordFormatException("Unexpected VersionInfo number for RC4Header " + _minorVersionNo);
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}
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_docId = Read(in1, 16);
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_saltData = Read(in1, 16);
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_saltHash = Read(in1, 16);
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}
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private static byte[] Read(RecordInputStream in1, int size)
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{
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byte[] result = new byte[size];
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in1.ReadFully(result);
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return result;
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}
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public override String ToString()
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{
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StringBuilder buffer = new StringBuilder();
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buffer.Append("[FILEPASS]\n");
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buffer.Append(" .type = ").Append(HexDump.ShortToHex(_encryptionType)).Append("\n");
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buffer.Append(" .info = ").Append(HexDump.ShortToHex(_encryptionInfo)).Append("\n");
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buffer.Append(" .ver = ").Append(HexDump.ShortToHex(_minorVersionNo)).Append("\n");
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buffer.Append(" .docId= ").Append(HexDump.ToHex(_docId)).Append("\n");
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buffer.Append(" .salt = ").Append(HexDump.ToHex(_saltData)).Append("\n");
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buffer.Append(" .hash = ").Append(HexDump.ToHex(_saltHash)).Append("\n");
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buffer.Append("[/FILEPASS]\n");
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return buffer.ToString();
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}
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public override void Serialize(ILittleEndianOutput out1)
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{
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out1.WriteShort(_encryptionType);
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out1.WriteShort(_encryptionInfo);
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out1.WriteShort(_minorVersionNo);
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out1.Write(_docId);
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out1.Write(_saltData);
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out1.Write(_saltHash);
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}
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protected override int DataSize
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{
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get
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{
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return 54;
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}
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}
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public byte[] DocId
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{
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get
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{
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return _docId;
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}
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set
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{
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}
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}
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public byte[] SaltData
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{
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get
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{
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return _saltData;
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}
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}
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public byte[] SaltHash
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{
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get
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{
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return _saltHash;
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}
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}
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public override short Sid
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{
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get { return sid; }
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}
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public override Object Clone()
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{
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// currently immutable
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return this;
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}
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}
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}
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