KJarify

A performant, multithreaded DEX to Java bytecode translator, written in kotlin.
It has a similar capabilities as the original EnJarify written in Python (source here).

Usage

Command line

java -jar kJarify-fat.jar example.apk

As a library

In Java

void example(File input, File output) {
    KJarify.process(inputFile, outputFile, OptimizationOptions.PRETTY);
}

In kotlin with coroutines

suspend fun example(input: File, output: File) {
    KJarify.suspendProcess(input, output, OptimizationOptions.PRETTY)
}

More advanced

Java

List<byte[]> dexDataList = ...

DexProcessor.ProcessCallBack callback = new DexProcessor.ProcessCallBack() {
    @Override
    public void onClassTranslated(@NotNull String unicodeName, @NotNull byte[] classData) {
        ... handle the translated byte codes
    }
};

DexProcessor processor = new DexProcessor(
        OptimizationOptions.ALL,
        Executors.newFixedThreadPool(16),
        callback
);

processor.process(dexDataList);

// you can get the result without a callback too
Map<String, byte[]> classDataList = processor.classes;

Kotlin

val dexDataList: List<ByteArray> = ...

val callback = object : DexProcessor.ProcessCallBack() {
    override suspend fun suspendOnClassTranslated(unicodeName: String, classData: ByteArray) {
        ... handle the translated byte codes
    }
}

val processor = DexProcessor(
    optimizationOptions = OptimizationOptions(
        ...
    ),
    coroutineDispatcher = Dispatchers.Default,
    callback = callback,
)

processor.suspendProcess(dexDataList)

// you can get the result without a callback too
val classDataList: Map<String, ByteArray> = processor.classes

Speed

On a 8c/16t 7820X CPU

DEX size	EnJarify	KJarify
~16.6MB	1min 5s	5.6s
~94.6MB	8 min 9s	37s