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Nebulous

A simple and small Java bytecode obfuscator written in Kotlin.

List of transformers

  • StringPooler
  • StringEncryptor
  • StringSplitter (very stupid, shouldn't use except for testing)
  • NumberPooler
  • FieldRenamer
  • MethodRenamer
  • ClassRenamer
  • MemberShuffler
  • FullAccessFlags
  • DebugInfoRemover
  • NOPRemover
  • LineNumberRemover
  • GotoInliner
  • GotoReturnInliner

Use

To run nebulous, you must first create a json config file with the template below. You can omit any transformers and they will be automatically set to false.

Example config.json:

{
    "input": "input.jar",
    "output": "output.jar",
    "libraries": [
    	"/path/to/external/dependency/"
    ],
    "exclusions": [
        "some/package/path/",
        "some/actual/Class"
    ],
    "StringPooler": true,
    "StringEncryptor": true,
    "NumberPooler": true,
    "FieldRenamer": true,
    "MethodRenamer": true,
    "ClassRenamer": true,
    "ClassRenamerPrefix": "dev/tigr/ares/",
    "MemberShuffler": true,
    "FullAccessFlags": true,
    "DebugInfoRemover": true,
    "NOPRemover": true,
    "LineNumberRemover": true,
    "GotoInliner": true,
    "GotoReturnInliner": true
}

Then to run it:

java -jar nebulous.jar config.json

Credit

Credit to jasmo and radon for being helpful to learn obfuscation techniques