5.9. Deterministic Obfuscation

2021.1

Deterministic obfuscation allows to produce an assembly whose byte-for-byte output is identical across obfuscations for identical inputs.

By default, obfuscator output from a given set of inputs is unique, since the obfuscator uses randomly generated cryptographic material for every obfuscation. You can use deterministic obfuscation directive or command-line parameter to produce a deterministic assembly, one whose binary content is identical across obfuscations as long as the input remains the same. In such an obfuscation, the cryptographic material is derived from a hash of all obfuscation inputs. The obfuscator considers the following inputs that affect determinism:

The precise version of the obfuscator used
The binary contents of the assembly files explicitly passed to the obfuscator as inputs
The obfuscator license key

Instructions on enabling deterministic obfuscation

Open obfuscatable project inside the IDE
Add new source file to the project and call it ObfuscationSettings.cs (for C#) or ObfuscationSettings.vb (for Visual Basic .NET). You may prefer to use another name instead of ObfuscationSettings.cs or ObfuscationSettings.vb

Fill ObfuscationSettings.cs with the following content (C#):

using System;
using System.Reflection;

[assembly: Obfuscation(Feature = "deterministic", Exclude = false)]

For Visual Basic .NET, fill ObfuscationSettings.vb with the following content:

Imports System
Imports System.Reflection

<Assembly: Obfuscation(Feature:="deterministic", Exclude:=False)>

Alternatively, deterministic obfuscation can be enabled by specifying --deterministic option in the command-line interface of Eazfuscator.NET or by setting EAZFUSCATOR_NET_DETERMINISTIC environment variable to 1.

	Availability
	Deterministic obfuscation is only available in enterprise edition of Eazfuscator.NET (Site License).

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