126 lines
3.9 KiB
C#
126 lines
3.9 KiB
C#
/*
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Copyright (C) 2011-2015 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using dnlib.IO;
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namespace de4dot.code.deobfuscators.CodeVeil {
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class ResourceReader {
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IBinaryReader reader;
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string resourceReader;
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string resourceSet;
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public string ResourceReaderName {
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get { return resourceReader; }
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}
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public string ResourceSetName {
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get { return resourceSet; }
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}
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public ResourceReader(IBinaryReader reader) {
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this.reader = reader;
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}
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public ResourceInfo[] Read() {
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if (reader.ReadUInt32() != 0xBEEFCACE)
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throw new InvalidDataException("Invalid magic");
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if (reader.ReadUInt32() <= 0)
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throw new InvalidDataException("Invalid number");
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reader.ReadUInt32();
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resourceReader = reader.ReadString();
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if (Utils.StartsWith(resourceReader, "System.Resources.ResourceReader", StringComparison.Ordinal))
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throw new InvalidDataException("Resource isn't encrypted");
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resourceSet = reader.ReadString();
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if (reader.ReadByte() != 1)
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throw new ApplicationException("Invalid version");
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int flags = reader.ReadByte();
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if ((flags & 0xFC) != 0)
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throw new ApplicationException("Invalid flags");
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bool inflateData = (flags & 1) != 0;
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bool encrypted = (flags & 2) != 0;
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int numResources = reader.ReadInt32();
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if (numResources < 0)
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throw new ApplicationException("Invalid number of resources");
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var infos = new ResourceInfo[numResources];
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for (int i = 0; i < numResources; i++) {
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var resourceName = ReadResourceName(reader, encrypted);
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int offset = reader.ReadInt32();
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byte resourceFlags = reader.ReadByte();
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int resourceLength = (resourceFlags & 0x80) == 0 ? -1 : reader.ReadInt32();
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infos[i] = new ResourceInfo(resourceName, resourceFlags, offset, resourceLength);
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}
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var dataReader = reader;
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if (encrypted) {
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var key = new uint[4];
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key[0] = dataReader.ReadUInt32();
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key[1] = dataReader.ReadUInt32();
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int numDwords = dataReader.ReadInt32();
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if (numDwords < 0 || numDwords >= 0x40000000)
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throw new ApplicationException("Invalid number of encrypted dwords");
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var encryptedData = new uint[numDwords];
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for (int i = 0; i < numDwords; i++)
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encryptedData[i] = dataReader.ReadUInt32();
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key[2] = dataReader.ReadUInt32();
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key[3] = dataReader.ReadUInt32();
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DeobUtils.XxteaDecrypt(encryptedData, key);
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byte[] decryptedData = new byte[encryptedData.Length * 4];
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Buffer.BlockCopy(encryptedData, 0, decryptedData, 0, decryptedData.Length);
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dataReader = MemoryImageStream.Create(decryptedData);
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}
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if (inflateData) {
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var data = dataReader.ReadRemainingBytes();
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data = DeobUtils.Inflate(data, true);
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dataReader = MemoryImageStream.Create(data);
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}
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foreach (var info in infos)
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info.dataReader = dataReader;
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return infos;
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}
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static string ReadResourceName(IBinaryReader reader, bool encrypted) {
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if (!encrypted)
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return reader.ReadString();
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int len = reader.ReadInt32();
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if (len < 0)
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throw new ApplicationException("Invalid string length");
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var sb = new StringBuilder(len);
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for (int i = 0; i < len; i++)
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sb.Append((char)Rol3(reader.ReadChar()));
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return sb.ToString();
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}
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static char Rol3(char c) {
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ushort s = (ushort)c;
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return (char)((s << 3) | (s >> (16 - 3)));
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}
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}
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}
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