124 lines
3.9 KiB
C#
124 lines
3.9 KiB
C#
/*
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Copyright (C) 2011-2012 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.IO;
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using System.Security.Cryptography;
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using Mono.Cecil;
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using ICSharpCode.SharpZipLib.Zip.Compression;
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namespace de4dot.code.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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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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public static byte[] readModule(ModuleDefinition module) {
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return Utils.readFile(module.FullyQualifiedName);
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}
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public static bool isCode(short[] nativeCode, byte[] code) {
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if (nativeCode.Length != code.Length)
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return false;
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for (int i = 0; i < nativeCode.Length; i++) {
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if (nativeCode[i] == -1)
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continue;
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if ((byte)nativeCode[i] != code[i])
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return false;
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}
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return true;
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}
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public static byte[] aesDecrypt(byte[] data, byte[] key, byte[] iv) {
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using (var aes = new RijndaelManaged { Mode = CipherMode.CBC }) {
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using (var transform = aes.CreateDecryptor(key, iv)) {
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return transform.TransformFinalBlock(data, 0, data.Length);
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}
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}
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}
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public static byte[] des3Decrypt(byte[] data, byte[] key, byte[] iv) {
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using (var des3 = TripleDES.Create()) {
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using (var transform = des3.CreateDecryptor(key, iv)) {
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return transform.TransformFinalBlock(data, 0, data.Length);
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}
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}
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}
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public static byte[] desDecrypt(byte[] data, int start, int len, byte[] key, byte[] iv) {
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using (var des = new DESCryptoServiceProvider()) {
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using (var transform = des.CreateDecryptor(key, iv)) {
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return transform.TransformFinalBlock(data, start, len);
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}
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}
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}
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public static string getExtension(ModuleKind kind) {
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switch (kind) {
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case ModuleKind.Dll:
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return ".dll";
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case ModuleKind.NetModule:
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return ".netmodule";
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case ModuleKind.Console:
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case ModuleKind.Windows:
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default:
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return ".exe";
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}
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}
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public static byte[] inflate(byte[] data, bool hasHeader) {
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return inflate(data, 0, data.Length, hasHeader);
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}
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public static byte[] inflate(byte[] data, int start, int len, bool hasHeader) {
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var buffer = new byte[0x1000];
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var memStream = new MemoryStream();
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var inflater = new Inflater(hasHeader);
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inflater.SetInput(data, start, len);
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while (true) {
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int count = inflater.Inflate(buffer, 0, buffer.Length);
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if (count == 0)
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break;
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memStream.Write(buffer, 0, count);
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}
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return memStream.ToArray();
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}
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}
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}
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