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/*
Copyright (C) 2011-2015 de4dot@gmail.com
This file is part of de4dot.
de4dot is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
de4dot is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Reflection;
namespace AssemblyData {
class StringDecrypterService : AssemblyService, IStringDecrypterService {
IStringDecrypter stringDecrypter = null;
void CheckStringDecrypter() {
if (stringDecrypter == null)
throw new ApplicationException("SetStringDecrypterType() hasn't been called yet.");
}
public void LoadAssembly(string filename) {
LoadAssemblyInternal(filename);
}
public void SetStringDecrypterType(StringDecrypterType type) {
if (stringDecrypter != null)
throw new ApplicationException("StringDecrypterType already set");
switch (type) {
case StringDecrypterType.Delegate:
stringDecrypter = new DelegateStringDecrypter();
break;
case StringDecrypterType.Emulate:
stringDecrypter = new EmuStringDecrypter();
break;
default:
throw new ApplicationException(string.Format("Unknown StringDecrypterType {0}", type));
}
}
public int DefineStringDecrypter(int methodToken) {
CheckStringDecrypter();
var methodInfo = FindMethod(methodToken);
if (methodInfo == null)
throw new ApplicationException(string.Format("Could not find method {0:X8}", methodToken));
if (methodInfo.ReturnType != typeof(string) && methodInfo.ReturnType != typeof(object))
throw new ApplicationException(string.Format("Method return type must be string or object: {0}", methodInfo));
return stringDecrypter.DefineStringDecrypter(methodInfo);
}
public object[] DecryptStrings(int stringDecrypterMethod, object[] args, int callerToken) {
CheckStringDecrypter();
var caller = GetCaller(callerToken);
foreach (var arg in args)
SimpleData.Unpack((object[])arg);
return SimpleData.Pack(stringDecrypter.DecryptStrings(stringDecrypterMethod, args, caller));
}
MethodBase GetCaller(int callerToken) {
try {
return assembly.GetModules()[0].ResolveMethod(callerToken);
}
catch {
return null;
}
}
MethodInfo FindMethod(int methodToken) {
CheckAssembly();
foreach (var module in assembly.GetModules()) {
var method = module.ResolveMethod(methodToken) as MethodInfo;
if (method != null)
return method;
}
return null;
}
}
}
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