76 lines
2.6 KiB
C#
76 lines
2.6 KiB
C#
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using System;
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using System.Linq;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using Obfuscator.Obfuscator.IntProtect;
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namespace Obfuscator.Obfuscator.CtrlFlow;
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internal class CflowV2
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{
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private static readonly Type[] types = new Type[7]
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{
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typeof(uint),
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typeof(int),
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typeof(long),
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typeof(ulong),
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typeof(ushort),
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typeof(short),
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typeof(double)
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};
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private static readonly int[] sizes = new int[7] { 4, 4, 8, 8, 2, 2, 8 };
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public static void Execute(ModuleDefMD md)
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{
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foreach (TypeDef type in md.Types)
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{
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if (type == md.GlobalType)
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{
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continue;
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}
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foreach (MethodDef method in type.Methods)
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{
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if (!method.Name.StartsWith("get_") && !method.Name.StartsWith("set_") && method.HasBody && !method.IsConstructor)
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{
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method.Body.SimplifyBranches();
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ExecuteMethod(method);
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}
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}
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}
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}
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public static void ExecuteMethod(MethodDef method)
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{
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Console.WriteLine(string.Concat(method.Name, method.Body.Instructions.Count().ToString()));
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for (int i = 0; i < method.Body.Instructions.Count(); i++)
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{
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if (method.Body.Instructions[i].IsLdcI4())
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{
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int num = IntEncoding.Next();
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int num2 = IntEncoding.Next();
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int value = num ^ num2;
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int num3 = IntEncoding.Next(types.Length);
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Type type = types[num3];
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Instruction instruction = OpCodes.Nop.ToInstruction();
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Local local = new Local(method.Module.ImportAsTypeSig(type));
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Instruction item = OpCodes.Stloc.ToInstruction(local);
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method.Body.Variables.Add(local);
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method.Body.Instructions.Insert(i + 1, item);
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method.Body.Instructions.Insert(i + 2, Instruction.Create(OpCodes.Ldc_I4, method.Body.Instructions[i].GetLdcI4Value() - sizes[num3]));
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method.Body.Instructions.Insert(i + 3, Instruction.Create(OpCodes.Ldc_I4, value));
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method.Body.Instructions.Insert(i + 4, Instruction.Create(OpCodes.Ldc_I4, num2));
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method.Body.Instructions.Insert(i + 5, Instruction.Create(OpCodes.Xor));
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method.Body.Instructions.Insert(i + 6, Instruction.Create(OpCodes.Ldc_I4, num));
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method.Body.Instructions.Insert(i + 7, Instruction.Create(OpCodes.Bne_Un, instruction));
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method.Body.Instructions.Insert(i + 8, Instruction.Create(OpCodes.Ldc_I4, 2));
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method.Body.Instructions.Insert(i + 9, item);
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method.Body.Instructions.Insert(i + 10, Instruction.Create(OpCodes.Sizeof, method.Module.Import(type)));
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method.Body.Instructions.Insert(i + 11, Instruction.Create(OpCodes.Add));
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method.Body.Instructions.Insert(i + 12, instruction);
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i += method.Body.Instructions.Count - i;
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}
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}
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}
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}
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