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添加 AddRotateXorInstruction AddXorRotateInstruction XorAddRotateInstruction MultipleInstruction这几种基础加密指令

backup
walon 2025-05-13 19:50:07 +08:00
parent 09e4f3269c
commit a4e4d199be
6 changed files with 281 additions and 13 deletions
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66
Editor/EncryptionVM/Instructions/AddRotateXorInstruction.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Obfuz.EncryptionVM.Instructions
{
public class AddRotateXorInstruction : EncryptionInstructionBase
{
// x = x + p1 + secretKey[index1];
// x = Rotate(x, p2)
// x = x ^ p3 ^ salt;
private readonly int _addValue;
private readonly int _index1;
private readonly int _rotateBitNum;
private readonly int _xorValue;
public AddRotateXorInstruction(int addValue, int index1, int rotateBitNum, int xorValue)
{
_addValue = addValue;
_index1 = index1;
_rotateBitNum = rotateBitNum;
_xorValue = xorValue;
}
public override int Encrypt(int value, int[] secretKey, int salt)
{
value += _addValue + secretKey[_index1];
uint part1 = (uint)value << _rotateBitNum;
uint part2 = (uint)value >> (32 - _rotateBitNum);
value = (int)(part1 | part2);
value ^= _xorValue ^ salt;
return value;
}
public override int Decrypt(int value, int[] secretKey, int salt)
{
value ^= _xorValue ^ salt;
uint value2 = (uint)value >> _rotateBitNum;
uint part1 = (uint)value << (32 - _rotateBitNum);
value = (int)(value2 | part1);
value -= _addValue + secretKey[_index1];
return value;
}
public override void GenerateEncryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value += {_addValue} + _secretKey[{_index1}];");
lines.Add(indent + $"uint part1 = (uint)value << {_rotateBitNum};");
lines.Add(indent + $"uint part2 = (uint)value >> (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(part1 | part2);");
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
}
public override void GenerateDecryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
lines.Add(indent + $"uint value2 = (uint)value >> {_rotateBitNum};");
lines.Add(indent + $"uint part1 = (uint)value << (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(value2 | part1);");
lines.Add(indent + $"value -= {_addValue} + _secretKey[{_index1}];");
}
}
}

66
Editor/EncryptionVM/Instructions/AddXorRotateInstruction.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Obfuz.EncryptionVM.Instructions
{
public class AddXorRotateInstruction : EncryptionInstructionBase
{
// x = x + p1 + secretKey[index1];
// x = x ^ p3 ^ salt;
// x = Rotate(x, p2)
private readonly int _addValue;
private readonly int _index1;
private readonly int _rotateBitNum;
private readonly int _xorValue;
public AddXorRotateInstruction(int addValue, int index1, int xorValue, int rotateBitNum)
{
_addValue = addValue;
_index1 = index1;
_rotateBitNum = rotateBitNum;
_xorValue = xorValue;
}
public override int Encrypt(int value, int[] secretKey, int salt)
{
value += _addValue + secretKey[_index1];
value ^= _xorValue ^ salt;
uint part1 = (uint)value << _rotateBitNum;
uint part2 = (uint)value >> (32 - _rotateBitNum);
value = (int)(part1 | part2);
return value;
}
public override int Decrypt(int value, int[] secretKey, int salt)
{
uint value2 = (uint)value >> _rotateBitNum;
uint part1 = (uint)value << (32 - _rotateBitNum);
value = (int)(value2 | part1);
value ^= _xorValue ^ salt;
value -= _addValue + secretKey[_index1];
return value;
}
public override void GenerateEncryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value += {_addValue} + _secretKey[{_index1}];");
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
lines.Add(indent + $"uint part1 = (uint)value << {_rotateBitNum};");
lines.Add(indent + $"uint part2 = (uint)value >> (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(part1 | part2);");
}
public override void GenerateDecryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"uint part1 = (uint)value >> {_rotateBitNum};");
lines.Add(indent + $"uint part2 = (uint)value << (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(part1 | part2);");
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
lines.Add(indent + $"value -= {_addValue} + _secretKey[{_index1}];");
}
}
}

64
Editor/EncryptionVM/Instructions/MultipleInstruction.cs Normal file
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using NUnit.Framework;
using System;
using System.Collections.Generic;
namespace Obfuz.EncryptionVM.Instructions
{
public class MultipleInstruction : EncryptionInstructionBase
{
private readonly int _multiValue;
private readonly int _revertMultiValue;
private readonly int _opKeyIndex;
public MultipleInstruction(int addValue, int opKeyIndex)
{
_multiValue = addValue;
_opKeyIndex = opKeyIndex;
_revertMultiValue = (int)ModInverseOdd((uint)addValue);
Verify();
}
private void Verify()
{
int a = 1122334;
Assert.AreEqual(a, a * _multiValue * _revertMultiValue);
}
public static uint ModInverseOdd(uint a)
{
if (a % 2 == 0)
throw new ArgumentException("Input must be an odd number.", nameof(a));
uint x = 1; // 初始解：x₀ = 1 (mod 2)
for (int i = 0; i < 5; i++) // 迭代5次（2^1 → 2^32）
{
int shift = 2 << i; // 当前模数为 2^(2^(i+1))
ulong mod = 1UL << shift; // 使用 ulong 避免溢出
ulong ax = (ulong)a * x; // 计算 a*x（64位避免截断）
ulong term = (2 - ax) % mod;
x = (uint)((x * term) % mod); // 更新 x，结果截断为 uint
}
return x; // 最终解为 x₅ mod 2^32
}
public override int Encrypt(int value, int[] secretKey, int salt)
{
return value * _multiValue + secretKey[_opKeyIndex] + salt;
}
public override int Decrypt(int value, int[] secretKey, int salt)
{
return (value - secretKey[_opKeyIndex] - salt) * _revertMultiValue;
}
public override void GenerateEncryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value = value * {_multiValue} + _secretKey[{_opKeyIndex}] + salt;");
}
public override void GenerateDecryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value = (value - _secretKey[{_opKeyIndex}] - salt) * {_revertMultiValue};");
}
}
}

66
Editor/EncryptionVM/Instructions/XorAddRotateInstruction.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Obfuz.EncryptionVM.Instructions
{
public class XorAddRotateInstruction : EncryptionInstructionBase
{
// x = x ^ p3 ^ salt;
// x = x + p1 + secretKey[index1];
// x = Rotate(x, p2)
private readonly int _addValue;
private readonly int _index1;
private readonly int _rotateBitNum;
private readonly int _xorValue;
public XorAddRotateInstruction(int xorValue, int addValue, int index1, int rotateBitNum)
{
_addValue = addValue;
_index1 = index1;
_rotateBitNum = rotateBitNum;
_xorValue = xorValue;
}
public override int Encrypt(int value, int[] secretKey, int salt)
{
value ^= _xorValue ^ salt;
value += _addValue + secretKey[_index1];
uint part1 = (uint)value << _rotateBitNum;
uint part2 = (uint)value >> (32 - _rotateBitNum);
value = (int)(part1 | part2);
return value;
}
public override int Decrypt(int value, int[] secretKey, int salt)
{
uint value2 = (uint)value >> _rotateBitNum;
uint part1 = (uint)value << (32 - _rotateBitNum);
value = (int)(value2 | part1);
value -= _addValue + secretKey[_index1];
value ^= _xorValue ^ salt;
return value;
}
public override void GenerateEncryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
lines.Add(indent + $"value += {_addValue} + _secretKey[{_index1}];");
lines.Add(indent + $"uint part1 = (uint)value << {_rotateBitNum};");
lines.Add(indent + $"uint part2 = (uint)value >> (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(part1 | part2);");
}
public override void GenerateDecryptCode(List<string> lines, string indent)
{
lines.Add(indent + $"uint value2 = (uint)value >> {_rotateBitNum};");
lines.Add(indent + $"uint part1 = (uint)value << (32 - {_rotateBitNum});");
lines.Add(indent + $"value = (int)(value2 | part1);");
lines.Add(indent + $"value -= {_addValue} + _secretKey[{_index1}];");
lines.Add(indent + $"value ^= {_xorValue} ^ salt;");
}
}
}

30
Editor/EncryptionVM/VirtualMachineCreator.cs
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@ -1,6 +1,10 @@
using Obfuz.EncryptionVM.Instructions; using NUnit.Framework;
using Obfuz.EncryptionVM.Instructions;
using Obfuz.Utils; using Obfuz.Utils;
using System;
using System.Collections.Generic;
using UnityEngine.Assertions; using UnityEngine.Assertions;
using UnityEngine.UIElements;
namespace Obfuz.EncryptionVM namespace Obfuz.EncryptionVM
{ {
@ -21,19 +25,21 @@ namespace Obfuz.EncryptionVM
_random = new RandomWithKey(intGenerationSecretKey, 0); _random = new RandomWithKey(intGenerationSecretKey, 0);
} }
private readonly List<Func<IRandom, int, EncryptionInstructionBase>> _instructionCreators = new List<Func<IRandom, int, EncryptionInstructionBase>>
{
(r, len) => new AddInstruction(r.NextInt(), r.NextInt(len)),
(r, len) => new XorInstruction(r.NextInt(), r.NextInt(len)),
(r, len) => new BitRotateInstruction(r.NextInt(32), r.NextInt(len)),
(r, len) => new MultipleInstruction(r.NextInt() | 0x1, r.NextInt(len)),
(r, len) => new AddRotateXorInstruction(r.NextInt(), r.NextInt(len), r.NextInt(32), r.NextInt()),
(r, len) => new AddXorRotateInstruction(r.NextInt(), r.NextInt(len), r.NextInt(), r.NextInt(32)),
(r, len) => new XorAddRotateInstruction(r.NextInt(), r.NextInt(), r.NextInt(len), r.NextInt(32)),
};
private IEncryptionInstruction CreateRandomInstruction(int intSecretKeyLength) private IEncryptionInstruction CreateRandomInstruction(int intSecretKeyLength)
{ {
switch (_random.NextInt(3)) return _instructionCreators[_random.NextInt(_instructionCreators.Count)](_random, intSecretKeyLength);
{
case 0:
return new AddInstruction(_random.NextInt(), _random.NextInt(intSecretKeyLength));
case 1:
return new XorInstruction(_random.NextInt(), _random.NextInt(intSecretKeyLength));
case 2:
return new BitRotateInstruction(_random.NextInt(32), _random.NextInt(intSecretKeyLength));
default:
throw new System.Exception("Invalid instruction type");
}
} }
private EncryptionInstructionWithOpCode CreateEncryptOpCode(ushort code) private EncryptionInstructionWithOpCode CreateEncryptOpCode(ushort code)

2
package.json
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{ {
"name": "com.code-philosophy.obfuz", "name": "com.code-philosophy.obfuz",
"version": "1.0.0-beta", "version": "1.0.0-alpha",
"displayName": "Obfuz", "displayName": "Obfuz",
"description": "Obfuz is a powerful code obfuscation tool designed specifically for Unity projects.", "description": "Obfuz is a powerful code obfuscation tool designed specifically for Unity projects.",
"category": "Editor", "category": "Editor",