35 lines
1.0 KiB
C#
35 lines
1.0 KiB
C#
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.Mutation2;
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public class StringLen : iMutation
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{
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public void Prepare(TypeDef type)
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{
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}
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public void Process(MethodDef method, ref int index)
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{
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if (method.DeclaringType == method.Module.GlobalType)
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{
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index--;
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return;
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}
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int ldcI4Value = method.Body.Instructions[index].GetLdcI4Value();
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int num = Methods.Random.Next(4, 15);
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string operand = Methods.GenerateString((byte)num);
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method.Body.Instructions[index].OpCode = OpCodes.Ldc_I4;
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method.Body.Instructions[index].Operand = ldcI4Value - num;
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method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Ldstr, operand));
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method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Call, method.Module.Import(typeof(string).GetMethod("get_Length"))));
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method.Body.Instructions.Insert(++index, new Instruction(OpCodes.Add));
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}
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public bool Supported(Instruction instr)
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{
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return Utils.CheckArithmetic(instr);
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}
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}
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