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obfuz/Editor/ObfusPasses/EvalStackObfus/DefaultObfuscator.cs

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add copyright header to all cs files.
2025-10-29 20:40:37 +08:00
// Copyright 2025 Code Philosophy
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
支持EvalStackObfus
2025-06-21 10:59:39 +08:00
using dnlib.DotNet.Emit;
using Obfuz.Utils;
using System.Collections.Generic;
namespace Obfuz.ObfusPasses.EvalStackObfus
{
class DefaultObfuscator : ObfuscatorBase
{
public override bool ObfuscateInt(Instruction inst, List<Instruction> outputInsts, ObfusMethodContext ctx)
{
IRandom random = ctx.localRandom;
switch (random.NextInt(4))
{
case 0:
{
// x = x + a
int a = 0;
float constProbability = 0f;
ConstObfusUtil.LoadConstInt(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 1:
{
// x = x * a * ra
int a = random.NextInt() | 0x1; // Ensure a is not zero
int ra = MathUtil.ModInverse32(a);
float constProbability = 0.5f;
ConstObfusUtil.LoadConstInt(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstInt(ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
case 2:
{
// x = (x * a + b) * ra - (b * ra)
int a = random.NextInt() | 0x1; // Ensure a is not zero
int ra = MathUtil.ModInverse32(a);
int b = random.NextInt();
int b_ra = -b * ra;
float constProbability = 0.5f;
ConstObfusUtil.LoadConstInt(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstInt(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstInt(ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstInt(b_ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 3:
{
// x = ((x + a) * b + c) * rb - (a*b + c) * rb
int a = random.NextInt();
int b = random.NextInt() | 0x1; // Ensure b is not zero
int rb = MathUtil.ModInverse32(b);
int c = random.NextInt();
int r = -(a * b + c) * rb;
float constProbability = 0.5f;
ConstObfusUtil.LoadConstInt(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstInt(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstInt(c, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstInt(rb, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstInt(r, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
default: return false;
}
}
public override bool ObfuscateLong(Instruction inst, List<Instruction> outputInsts, ObfusMethodContext ctx)
{
IRandom random = ctx.localRandom;
switch (random.NextInt(4))
{
case 0:
{
// x = x + a
long a = 0;
float constProbability = 0f;
ConstObfusUtil.LoadConstLong(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 1:
{
// x = x * a * ra
long a = random.NextLong() | 0x1L; // Ensure a is not zero
long ra = MathUtil.ModInverse64(a);
float constProbability = 0.5f;
ConstObfusUtil.LoadConstLong(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstLong(ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
case 2:
{
// x = (x * a + b) * ra - (b * ra)
long a = random.NextLong() | 0x1L; // Ensure a is not zero
long ra = MathUtil.ModInverse64(a);
long b = random.NextLong();
long b_ra = -b * ra;
float constProbability = 0.5f;
ConstObfusUtil.LoadConstLong(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstLong(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstLong(ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstLong(b_ra, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 3:
{
// x = ((x + a) * b + c) * rb - (a*b + c) * rb
long a = random.NextLong();
long b = random.NextLong() | 0x1L; // Ensure b is not zero
long rb = MathUtil.ModInverse64(b);
long c = random.NextLong();
long r = -(a * b + c) * rb;
float constProbability = 0.5f;
ConstObfusUtil.LoadConstLong(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstLong(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstLong(c, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstLong(rb, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
ConstObfusUtil.LoadConstLong(r, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
default: return false;
}
}
public override bool ObfuscateFloat(Instruction inst, List<Instruction> outputInsts, ObfusMethodContext ctx)
{
IRandom random = ctx.localRandom;
switch (random.NextInt(3))
{
case 0:
{
// x = x + 0f
float a = 0.0f;
float constProbability = 0f;
ConstObfusUtil.LoadConstFloat(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 1:
{
// x = x * 1f;
float a = 1.0f;
float constProbability = 0f;
ConstObfusUtil.LoadConstFloat(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
case 2:
{
// x = (x + a) * b; a = 0.0f, b = 1.0f
float a = 0.0f;
float b = 1.0f;
float constProbability = 0f;
ConstObfusUtil.LoadConstFloat(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstFloat(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
default: return false;
}
}
public override bool ObfuscateDouble(Instruction inst, List<Instruction> outputInsts, ObfusMethodContext ctx)
{
IRandom random = ctx.localRandom;
switch (random.NextInt(3))
{
case 0:
{
// x = x + 0.0
double a = 0.0;
float constProbability = 0f;
ConstObfusUtil.LoadConstDouble(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
return true;
}
case 1:
{
// x = x * 1.0;
double a = 1.0;
float constProbability = 0f;
ConstObfusUtil.LoadConstDouble(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
case 2:
{
// x = (x + a) * b; a = 0.0, b = 1.0
double a = 0.0;
double b = 1.0;
float constProbability = 0f;
ConstObfusUtil.LoadConstDouble(a, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Add));
ConstObfusUtil.LoadConstDouble(b, random, constProbability, ctx.constFieldAllocator, outputInsts);
outputInsts.Add(Instruction.Create(OpCodes.Mul));
return true;
}
default: return false;
}
}
}
}