87 lines
2.5 KiB
C#
87 lines
2.5 KiB
C#
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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.Helper;
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namespace Obfuscator.Obfuscator.ConstMelting;
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internal class ConstMelting
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{
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public static void Execute(ModuleDef moduleDef)
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{
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TypeDef[] array = moduleDef.Types.ToArray();
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for (int i = 0; i < array.Length; i++)
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{
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MethodDef[] array2 = array[i].Methods.ToArray();
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foreach (MethodDef methodDef in array2)
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{
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ReplaceStringLiterals(methodDef);
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ReplaceIntLiterals(methodDef);
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}
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}
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}
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private static void ReplaceStringLiterals(MethodDef methodDef)
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{
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if (!CanObfuscate(methodDef))
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{
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return;
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}
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foreach (Instruction instruction in methodDef.Body.Instructions)
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{
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if (instruction.OpCode == OpCodes.Ldstr)
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{
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MethodDef methodDef2 = new MethodDefUser(Methods.GenerateString(), MethodSig.CreateStatic(methodDef.DeclaringType.Module.CorLibTypes.String), MethodImplAttributes.IL, MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.HideBySig)
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{
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Body = new CilBody()
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};
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methodDef2.Body.Instructions.Add(new Instruction(OpCodes.Ldstr, instruction.Operand.ToString()));
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methodDef2.Body.Instructions.Add(new Instruction(OpCodes.Ret));
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methodDef.DeclaringType.Methods.Add(methodDef2);
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instruction.OpCode = OpCodes.Call;
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instruction.Operand = methodDef2;
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}
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}
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}
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private static void ReplaceIntLiterals(MethodDef methodDef)
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{
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if (!CanObfuscate(methodDef))
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{
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return;
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}
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foreach (Instruction instruction in methodDef.Body.Instructions)
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{
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if (instruction.OpCode == OpCodes.Ldc_I4)
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{
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MethodDef methodDef2 = new MethodDefUser(Methods.GenerateString(), MethodSig.CreateStatic(methodDef.DeclaringType.Module.CorLibTypes.Int32), MethodImplAttributes.IL, MethodAttributes.Public | MethodAttributes.Static | MethodAttributes.HideBySig)
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{
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Body = new CilBody()
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};
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methodDef2.Body.Instructions.Add(new Instruction(OpCodes.Ldc_I4, instruction.GetLdcI4Value()));
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methodDef2.Body.Instructions.Add(new Instruction(OpCodes.Ret));
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methodDef.DeclaringType.Methods.Add(methodDef2);
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instruction.OpCode = OpCodes.Call;
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instruction.Operand = methodDef2;
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}
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}
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}
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public static bool CanObfuscate(MethodDef methodDef)
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{
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if (!methodDef.HasBody)
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{
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return false;
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}
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if (!methodDef.Body.HasInstructions)
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{
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return false;
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}
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if (methodDef.DeclaringType.IsGlobalModuleType)
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{
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return false;
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}
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return true;
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}
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}
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