94 lines
2.8 KiB
C#
94 lines
2.8 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.Reflection;
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namespace AssemblyData {
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class StringDecrypterService : AssemblyService, IStringDecrypterService {
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IStringDecrypter stringDecrypter = null;
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void CheckStringDecrypter() {
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if (stringDecrypter == null)
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throw new ApplicationException("SetStringDecrypterType() hasn't been called yet.");
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}
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public void LoadAssembly(string filename) {
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LoadAssemblyInternal(filename);
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}
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public void SetStringDecrypterType(StringDecrypterType type) {
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if (stringDecrypter != null)
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throw new ApplicationException("StringDecrypterType already set");
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switch (type) {
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case StringDecrypterType.Delegate:
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stringDecrypter = new DelegateStringDecrypter();
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break;
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case StringDecrypterType.Emulate:
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stringDecrypter = new EmuStringDecrypter();
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break;
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default:
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throw new ApplicationException(string.Format("Unknown StringDecrypterType {0}", type));
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}
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}
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public int DefineStringDecrypter(int methodToken) {
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CheckStringDecrypter();
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var methodInfo = FindMethod(methodToken);
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if (methodInfo == null)
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throw new ApplicationException(string.Format("Could not find method {0:X8}", methodToken));
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if (methodInfo.ReturnType != typeof(string) && methodInfo.ReturnType != typeof(object))
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throw new ApplicationException(string.Format("Method return type must be string or object: {0}", methodInfo));
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return stringDecrypter.DefineStringDecrypter(methodInfo);
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}
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public object[] DecryptStrings(int stringDecrypterMethod, object[] args, int callerToken) {
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CheckStringDecrypter();
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var caller = GetCaller(callerToken);
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foreach (var arg in args)
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SimpleData.Unpack((object[])arg);
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return SimpleData.Pack(stringDecrypter.DecryptStrings(stringDecrypterMethod, args, caller));
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}
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MethodBase GetCaller(int callerToken) {
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try {
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return assembly.GetModules()[0].ResolveMethod(callerToken);
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}
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catch {
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return null;
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}
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}
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MethodInfo FindMethod(int methodToken) {
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CheckAssembly();
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foreach (var module in assembly.GetModules()) {
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var method = module.ResolveMethod(methodToken) as MethodInfo;
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if (method != null)
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return method;
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}
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return null;
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}
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}
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}
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