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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;
using System.Reflection.Emit;
using System.Collections.Generic;
namespace AssemblyData {
class DelegateStringDecrypter : IStringDecrypter {
delegate string DecryptString(object[] args);
List<DecryptString> stringDecryptMethods = new List<DecryptString>();
public int DefineStringDecrypter(MethodInfo method) {
stringDecryptMethods.Add(BuildDynamicMethod(method));
return stringDecryptMethods.Count - 1;
}
public object[] DecryptStrings(int stringDecrypterMethod, object[] args, MethodBase caller) {
if (stringDecrypterMethod > stringDecryptMethods.Count)
throw new ApplicationException("Invalid string decrypter method");
var rv = new object[args.Length];
var stringDecrypter = stringDecryptMethods[stringDecrypterMethod];
for (int i = 0; i < args.Length; i++)
rv[i] = stringDecrypter((object[])args[i]);
return rv;
}
DecryptString BuildDynamicMethod(MethodInfo method) {
var dm = new DynamicMethod("", typeof(string), new Type[] { typeof(object[]) }, typeof(DelegateStringDecrypter), true);
Utils.AddCallStringDecrypterMethodInstructions(method, dm.GetILGenerator());
return (DecryptString)dm.CreateDelegate(typeof(DecryptString));
}
}
}
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