67 lines
3.0 KiB
C#
67 lines
3.0 KiB
C#
// Copyright 2025 Code Philosophy
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using System.Collections.Generic;
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namespace Obfuz.ObfusPasses
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{
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public abstract class InstructionObfuscationPassBase : ObfuscationMethodPassBase
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{
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protected abstract bool TryObfuscateInstruction(MethodDef callingMethod, Instruction inst, IList<Instruction> instructions, int instructionIndex,
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List<Instruction> outputInstructions, List<Instruction> totalFinalInstructions);
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protected override void ObfuscateData(MethodDef method)
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{
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IList<Instruction> instructions = method.Body.Instructions;
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var outputInstructions = new List<Instruction>();
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var totalFinalInstructions = new List<Instruction>();
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for (int i = 0; i < instructions.Count; i++)
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{
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Instruction inst = instructions[i];
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outputInstructions.Clear();
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if (TryObfuscateInstruction(method, inst, instructions, i, outputInstructions, totalFinalInstructions))
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{
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// current instruction may be the target of control flow instruction, so we can't remove it directly.
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// we replace it with nop now, then remove it in CleanUpInstructionPass
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inst.OpCode = outputInstructions[0].OpCode;
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inst.Operand = outputInstructions[0].Operand;
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totalFinalInstructions.Add(inst);
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for (int k = 1; k < outputInstructions.Count; k++)
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{
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totalFinalInstructions.Add(outputInstructions[k]);
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}
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}
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else
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{
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totalFinalInstructions.Add(inst);
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}
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}
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instructions.Clear();
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foreach (var obInst in totalFinalInstructions)
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{
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instructions.Add(obInst);
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}
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}
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}
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}
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