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Custom Obfuscation Rules

This example demonstrates how to configure obfuscation rule files. For the complete sample project, see CustomConfigure.

Modify EncryptionVM Settings​

Open the ObfuzSettings window and locate the EncryptionVMSettings section.

  • Change the CodeGenerationSecretKey field to a custom value

Modify Secret Settings​

In the ObfuzSettings window, find the SecretSettings section.

  • Change the DefaultStaticSecretKey field to a custom value
  • Change the DefaultDynamicSecretKey field to a custom value
  • Change the RandomSeed field to a custom integer value

Modify Symbol Obfuscation Settings​

Create a symbol-obfuscation.xml file in the Assets/Obfuz directory, and add Assets/Obfuz/symbol-obfuscation.xml to SymbolObfusSettings.RuleFiles.

The file content is as follows:

<?xml version="1.0" encoding="UTF-8"?>

<obfuz>
    <assembly name="Assembly-CSharp">
      <type name="SymbolObfus.Test1" obName="0" applyToMembers="*"/> <!-- Do not obfuscate Test1 class itself and all its members, including nested classes -->
    </assembly>
</obfuz>

Modify Constant Encryption Settings​

Create a const-encrypt.xml file in the Assets/Obfuz directory, and add Assets/Obfuz/const-encrypt.xml to ConstEncryptSettings.RuleFiles. The content is as follows:

<?xml version="1.0" encoding="UTF-8"?>

<obfuz>

    <whitelist type="int-range">-100,100</whitelist> <!-- Do not encrypt constants in the range [-100, 100] -->
    <whitelist type="string-length-range">,3</whitelist> <!-- Do not encrypt strings with length ≤ 3 -->
    
    <assembly name="Assembly-CSharp">
        <type name="ConstEncrypt.Test1" disableEncrypt="1"/> <!-- Disable constant encryption for all functions in Test1 class -->
        <type name="ConstEncrypt.Test2">
            <method name="Sum3" disableEncrypt="1"/> <!-- Do not encrypt constants in Sum3 function -->
        </type>
    </assembly>
</obfuz>

Modify Field Encryption Settings​

Create a field-encrypt.xml file in the Assets/Obfuz directory, and add Assets/Obfuz/field-encrypt.xml to FieldEncryptSettings.RuleFiles. The content is as follows:

<?xml version="1.0" encoding="UTF-8"?>

<obfuz>
    <assembly name="Assembly-CSharp">
        <type name="FieldEncrypt.Test1">
            <field name="a" encrypt="1"/>
        </type>
    </assembly>
</obfuz>

Modify Call Obfuscation Settings​

Create a call-obfuscation.xml file in the Assets/Obfuz directory, and add Assets/Obfuz/call-obfuscation.xml to CallObfusSettings.RuleFiles. The content is as follows:

<?xml version="1.0" encoding="UTF-8"?>

<obfuz>
  <whitelist>
    <assembly name="mscorlib" obfuscate="0"/>
    <assembly name="UnityEngine.*" obfuscate="0"/>
  </whitelist>
  
  <assembly name="Assembly-CSharp">
      <type name="*CallObfus.Test1" disableObfuscation="1"/>
      <type name="*CallObfus.Test2">
          <method name="Run1" disableObfuscation="1"/>
      </type>
  </assembly>
</obfuz>

Generate Encryption Virtual Machine and Keys​

  • Run the menu Obfuz/GenerateEncryptionVM to generate encryption virtual machine code. The default generated code file is Assets/Obfuz/GeneratedEncryptionVirtualMachine.cs.
  • Run the menu Obfuz/GenerateSecretKeyFile to generate two key files. The default output files are Assets/Resources/Obfuz/defaultStaticSecretKey.bytes and Assets/Resources/Obfuz/defaultDynamicSecretKey.bytes

Add Test Code​

There are many files, please refer directly to CustomConfigure.

Build & Run​

Click Build And Run in the Player Settings window.

View Obfuscated Assembly-CSharp Code​

Use ILSpy to open Library/Obfuz/{buildTarget}/ObfuscatedAssemblies/Assembly-CSharp.dll.