2011-11-06 20:46:50 +08:00
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/*
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Copyright (C) 2011 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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2011-09-24 16:26:29 +08:00
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using System.IO;
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using Mono.Cecil;
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namespace de4dot.deobfuscators {
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static class DeobUtils {
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public static void decryptAndAddResources(ModuleDefinition module, string encryptedName, Func<byte[]> decryptResource) {
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Log.v("Decrypting resources, name: {0}", Utils.toCsharpString(encryptedName));
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var decryptedResourceData = decryptResource();
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if (decryptedResourceData == null)
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throw new ApplicationException("decryptedResourceData is null");
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var resourceModule = ModuleDefinition.ReadModule(new MemoryStream(decryptedResourceData));
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Log.indent();
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foreach (var rsrc in resourceModule.Resources) {
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Log.v("Adding decrypted resource {0}", Utils.toCsharpString(rsrc.Name));
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module.Resources.Add(rsrc);
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}
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Log.deIndent();
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}
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2011-11-06 19:16:06 +08:00
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public static T lookup<T>(ModuleDefinition module, T def, string errorMessage) where T : MemberReference {
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if (def == null)
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return null;
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var newDef = module.LookupToken(def.MetadataToken.ToInt32()) as T;
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if (newDef == null)
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throw new ApplicationException(errorMessage);
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return newDef;
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}
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2011-11-06 20:46:50 +08:00
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2011-11-10 07:44:37 +08:00
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// If the file is on the network, and we read more than 2MB, we'll read from the wrong
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// offset in the file! Tested: VMware 8, Win7 x64.
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const int MAX_BYTES_READ = 0x200000;
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2011-11-06 20:46:50 +08:00
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public static byte[] readModule(ModuleDefinition module) {
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using (var fileStream = new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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var fileData = new byte[(int)fileStream.Length];
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2011-11-10 07:44:37 +08:00
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int bytes, offset = 0, length = fileData.Length;
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while ((bytes = fileStream.Read(fileData, offset, System.Math.Min(MAX_BYTES_READ, length - offset))) > 0)
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offset += bytes;
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if (offset != length)
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throw new ApplicationException("Could not read all bytes");
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2011-11-06 20:46:50 +08:00
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return fileData;
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}
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}
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2011-09-24 16:26:29 +08:00
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}
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}
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