AddInstruction和 XorInstruction改为非线性，避免 field encryption出现 加密效果为0的情况

Editor/EncryptionVM/Instructions/AddInstruction.cs

@@ -14,22 +14,22 @@ namespace Obfuz.EncryptionVM.Instructions
         }
         public override int Encrypt(int value, int[] secretKey, int salt)
         {
-            return value + secretKey[_opKeyIndex] + salt + _addValue;
+            return (value ^ secretKey[_opKeyIndex] ^ salt) + _addValue;
         }
 
         public override int Decrypt(int value, int[] secretKey, int salt)
         {
-            return value - secretKey[_opKeyIndex] - salt - _addValue;
+            return (value - _addValue) ^ secretKey[_opKeyIndex] ^ salt;
         }
 
         public override void GenerateEncryptCode(List<string> lines, string indent)
         {
-            lines.Add(indent + $"value += _secretKey[{_opKeyIndex}] + salt + {_addValue};");
+            lines.Add(indent + $"value = (value ^ _secretKey[{_opKeyIndex}] ^ salt) + {_addValue};");
         }
 
         public override void GenerateDecryptCode(List<string> lines, string indent)
         {
-            lines.Add(indent + $"value -= _secretKey[{_opKeyIndex}] + salt + {_addValue};");
+            lines.Add(indent + $"value = (value  - {_addValue}) ^ _secretKey[{_opKeyIndex}] ^ salt;");
         }
     }
 }

Editor/EncryptionVM/Instructions/XorInstruction.cs

@@ -15,22 +15,22 @@ namespace Obfuz.EncryptionVM.Instructions
 
         public override int Encrypt(int value, int[] secretKey, int salt)
         {
-            return value ^ secretKey[_opKeyIndex] ^ salt ^ _xorValue;
+            return (value + secretKey[_opKeyIndex] + salt) ^ _xorValue;
         }
 
         public override int Decrypt(int value, int[] secretKey, int salt)
         {
-            return value ^ secretKey[_opKeyIndex] ^ salt ^ _xorValue;
+            return (value ^ _xorValue) - secretKey[_opKeyIndex] - salt;
         }
 
         public override void GenerateEncryptCode(List<string> lines, string indent)
         {
-            lines.Add(indent + $"value ^= _secretKey[{_opKeyIndex}] ^ salt ^ {_xorValue};");
+            lines.Add(indent + $"value = (value + _secretKey[{_opKeyIndex}] + salt) ^ {_xorValue};");
         }
 
         public override void GenerateDecryptCode(List<string> lines, string indent)
         {
-            lines.Add(indent + $"value ^= _secretKey[{_opKeyIndex}] ^ salt ^ {_xorValue};");
+            lines.Add(indent + $"value = (value ^ {_xorValue}) - _secretKey[{_opKeyIndex}] - salt;");
         }
     }
 }

Editor/EncryptionVM/VirtualMachineSimulator.cs

@@ -4,6 +4,7 @@ using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Runtime.CompilerServices;
 using System.Text;
+using UnityEngine;
 using UnityEngine.Assertions;
 using UnityEngine.UIElements;
 
@@ -32,6 +33,7 @@ namespace Obfuz.EncryptionVM
             {
                 int encryptedValue = _opCodes[i].Encrypt(value, _secretKey, i);
                 int decryptedValue = _opCodes[i].Decrypt(encryptedValue, _secretKey, i);
+                Debug.Log($"instruction type:{_opCodes[i].function.GetType()}");
                 Assert.AreEqual(value, decryptedValue);
             }