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I am currently trying to de-obfuscate a Java program (i.e. find each class name and namespace, each method name and each method parameter name). To do so, I started by using Enigma (the fork from FabricMC).

But I have access to old sources that are not obfuscated and I was wondering if I could automatically de-obfuscate the part of my Java program that did not change since then.

Basically, I have:

  • Version 3 that is non-obfuscated.
  • Version 6 that is obfuscated.
  • Version 7 that is obfuscated.
  • Version 9 that is obfuscated.

and I want to de-obfuscate automatically as much symbols as possible in Version 9.

Are you aware of any tool that can do this? Currently, I am navigating the unobfuscated files of Version 3 by hand and mapping Version 9 on Enigma by hand too, which is quite a long and tedious process.

Note: all the subjects I found during my research were about de-obfuscating without access to any prior, non-obfuscated, sources. I would like to extract the maximum I can from the non-obfuscated sources I obtained.

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Have you tried https://github.com/FabricMC/Matcher?
It doesn't always create the best matches automatically but it helps a lot by suggesting classes/methods/fields that are similar to each other across the different versions.

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  • I do not know how I missed this tool, but it nicely answer my question! It lacks documentation though, but the community is super nice and very reactive on the FabricMC Discord!
    – Adrien Suau
    Oct 22, 2022 at 16:11

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