initial commit

2026-08-27 11:21:58 -06:00
commit c21fb61050
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+using System;
+using System.Collections.Generic;
+using dnlib.DotNet;
+using dnlib.DotNet.Emit;
+using Obfuscator.Helper;
+
+namespace Obfuscator.Obfuscator.Mutation2;
+
+public class ComparerMutation : iMutation
+{
+	public void Prepare(TypeDef type)
+	{
+		if (type == type.Module.GlobalType)
+		{
+			return;
+		}
+		for (int i = 0; i < type.Methods.Count; i++)
+		{
+			MethodDef methodDef = type.Methods[i];
+			if (!methodDef.HasBody || methodDef.IsConstructor)
+			{
+				continue;
+			}
+			methodDef.Body.SimplifyBranches();
+			for (int j = 0; j < methodDef.Body.Instructions.Count; j++)
+			{
+				if (Utils.CheckArithmetic(methodDef.Body.Instructions[j]))
+				{
+					Execute(methodDef, ref j);
+				}
+			}
+		}
+	}
+
+	public void Execute(MethodDef method, ref int index)
+	{
+		if (method.Body.Instructions[index].OpCode == OpCodes.Call)
+		{
+			return;
+		}
+		int ldcI4Value = method.Body.Instructions[index].GetLdcI4Value();
+		Local local = new Local(method.Module.CorLibTypes.Int32);
+		Local local2 = new Local(method.Module.CorLibTypes.Int32);
+		method.Body.Variables.Add(local);
+		method.Body.Variables.Add(local2);
+		int num = Methods.Random.Next();
+		int num2 = Methods.Random.Next();
+		bool flag = Convert.ToBoolean(Methods.Random.Next(2));
+		int num3;
+		if (flag)
+		{
+			num3 = num2 - num;
+		}
+		else
+		{
+			num3 = Methods.Random.Next();
+			while (num3 + num == num2)
+			{
+				num3 = Methods.Random.Next();
+			}
+		}
+		method.Body.Instructions[index] = Instruction.CreateLdcI4(num);
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Stloc, local));
+		method.Body.Instructions.Insert(++index, Instruction.CreateLdcI4(num3));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Stloc, local2));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldloc, local));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldloc, local2));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Add));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldc_I4, num2));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ceq));
+		Instruction instruction = OpCodes.Nop.ToInstruction();
+		method.Body.Instructions.Insert(++index, new Instruction(flag ? OpCodes.Brfalse : OpCodes.Brtrue, instruction));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Nop));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldc_I4, ldcI4Value));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Stloc, local));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Nop));
+		Instruction instruction2 = OpCodes.Ldloc_S.ToInstruction(local);
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Br, instruction2));
+		method.Body.Instructions.Insert(++index, instruction);
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldc_I4, Methods.Random.Next()));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Stloc, local));
+		method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Nop));
+		method.Body.Instructions.Insert(++index, instruction2);
+	}
+
+	public void Process(MethodDef method, ref int index)
+	{
+	}
+
+	public static void InsertInstructions(IList<Instruction> instructions, Dictionary<Instruction, int> keyValuePairs)
+	{
+		foreach (KeyValuePair<Instruction, int> keyValuePair in keyValuePairs)
+		{
+			Instruction key = keyValuePair.Key;
+			int value = keyValuePair.Value;
+			instructions.Insert(value, key);
+		}
+	}
+
+	public bool Supported(Instruction instr)
+	{
+		return Utils.CheckArithmetic(instr);
+	}
+}