2011-11-06 19:19:26 +08:00
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/*
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2014-03-12 05:15:43 +08:00
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Copyright (C) 2011-2014 de4dot@gmail.com
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2011-11-06 19:19:26 +08:00
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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.Text;
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2012-12-20 09:06:09 +08:00
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using dnlib.DotNet;
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2011-11-06 19:19:26 +08:00
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2012-11-06 23:38:39 +08:00
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namespace de4dot.code.deobfuscators.Agile_NET {
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2011-11-06 19:19:26 +08:00
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class StringDecrypter {
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2012-11-07 12:17:45 +08:00
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ModuleDefMD module;
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2012-11-02 22:57:11 +08:00
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TypeDef stringDecrypterType;
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MethodDef stringDecrypterMethod;
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2011-11-06 19:19:26 +08:00
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byte[] stringDecrypterKey;
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public bool Detected {
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2012-04-26 07:16:08 +08:00
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get { return stringDecrypterMethod != null; }
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2011-11-06 19:19:26 +08:00
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}
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2012-11-02 22:57:11 +08:00
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public TypeDef Type {
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2011-11-06 19:19:26 +08:00
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get { return stringDecrypterType; }
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}
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2012-11-02 22:57:11 +08:00
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public MethodDef Method {
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2011-11-06 19:19:26 +08:00
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get { return stringDecrypterMethod; }
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2012-04-26 22:53:47 +08:00
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set { stringDecrypterMethod = value; }
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2011-11-06 19:19:26 +08:00
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}
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2012-11-07 12:17:45 +08:00
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public StringDecrypter(ModuleDefMD module, MethodDef stringDecrypterMethod) {
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2011-11-06 19:19:26 +08:00
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this.module = module;
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this.stringDecrypterMethod = stringDecrypterMethod;
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}
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2012-11-07 12:17:45 +08:00
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public StringDecrypter(ModuleDefMD module, StringDecrypter oldOne) {
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2011-11-06 19:19:26 +08:00
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this.module = module;
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2013-01-19 20:03:57 +08:00
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stringDecrypterType = Lookup(oldOne.stringDecrypterType, "Could not find stringDecrypterType");
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stringDecrypterMethod = Lookup(oldOne.stringDecrypterMethod, "Could not find stringDecrypterMethod");
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2011-11-06 19:19:26 +08:00
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stringDecrypterKey = oldOne.stringDecrypterKey;
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}
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2013-01-19 20:03:57 +08:00
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T Lookup<T>(T def, string errorMessage) where T : class, ICodedToken {
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return DeobUtils.Lookup(module, def, errorMessage);
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2011-11-06 19:19:26 +08:00
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}
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2013-01-19 20:03:57 +08:00
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public void Find() {
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2012-04-26 07:16:08 +08:00
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stringDecrypterKey = new byte[1] { 0xFF };
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2011-11-06 19:19:26 +08:00
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foreach (var type in module.Types) {
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if (type.FullName == "<D234>" || type.FullName == "<ClassD234>") {
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stringDecrypterType = type;
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foreach (var field in type.Fields) {
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if (field.FullName == "<D234> <D234>::345" || field.FullName == "<ClassD234>/D234 <ClassD234>::345") {
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stringDecrypterKey = field.InitialValue;
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break;
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}
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}
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break;
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}
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}
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}
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2013-01-19 20:03:57 +08:00
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public string Decrypt(string es) {
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2011-11-06 19:19:26 +08:00
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if (stringDecrypterKey == null)
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throw new ApplicationException("Trying to decrypt strings when stringDecrypterKey is null (could not find it!)");
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2012-12-03 08:22:14 +08:00
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char[] buf = new char[es.Length];
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2011-11-06 19:19:26 +08:00
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for (int i = 0; i < es.Length; i++)
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2012-12-03 08:22:14 +08:00
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buf[i] = (char)(es[i] ^ stringDecrypterKey[i % stringDecrypterKey.Length]);
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return new string(buf);
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2011-11-06 19:19:26 +08:00
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}
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}
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}
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