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https://github.com/konloch/bytecode-viewer

A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
https://github.com/konloch/bytecode-viewer

android apk baksmali bytecode bytecode-viewer cfr compiler decompiler dex2jar fernflower hacktoberfest java java-decompiler jsp krakatau procyon recompiler smali static-analysis war

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A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)

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README 

        
# Bytecode Viewer



Bytecode Viewer - a lightweight user-friendly Java/Android Bytecode Viewer, Decompiler & More.



#### New Features

* Jump to Declaration

* Draggable tabs

* Patched [CVE-2022-21675](https://github.com/Konloch/bytecode-viewer/security/advisories/GHSA-3wq9-j4fc-4wmc) (Make sure to upgrade to v2.11.X)

* Dark mode by default with multiple themes

* Translated into over 30 languages including: Arabic, German, Japanese, Mandarin, Russian, Spanish

* Plugin Writer - create and edit external plugins from within BCV

* Fixed Java & Bytecode editing/compiling

* Tabbed plugin console

* Right-click menus on the resource and search panels

* Javap disassembler

* XAPK support

* Latest dependencies (incl. decompilers like CFR, JD-GUI etc.)

* Added support to Java files compiled using JDK > 13

* Migrated to Maven



#### Links

* [BCV Discord](https://discord.gg/aexsYpfMEf)

* [Website](https://bytecodeviewer.com)

* [Source Code](https://github.com/konloch/bytecode-viewer)

* [Bin/Archive](https://github.com/konloch/bytecode-viewer/releases)

* [Java Docs](https://the.bytecode.club/docs/bytecode-viewer/)

* [License (Copyleft)](https://raw.githubusercontent.com/Konloch/bytecode-viewer/master/LICENSE)

* [Credits](https://github.com/Konloch/bytecode-viewer/blob/master/CREDITS.md)

* [Contributing](https://github.com/Konloch/bytecode-viewer/blob/master/CONTRIBUTING.md)

* [Report Bugs](https://github.com/Konloch/bytecode-viewer/issues)

* [Discussion Forum](https://the.bytecode.club/forumdisplay.php?fid=69)



#### Key Features

* Simply drag and drop to decompile and search Java Jars & Android APKs

* File format support for: Class, Jar, XAPK, APK, DEX, WAR, JSP, Image Resources, Text Resources & More

* 6 Built-in Java decompilers: Krakatau, CFR, Procyon, FernFlower, JADX, JD-GUI

* 3 Built-in Bytecode disassemblers, including 2 assemblers: Krakatau and Smali/BakSmali

* APK/DEX Support from Dex2Jar and Enjarify

* Built-in Java Compiler

* Advanced static-search functionality

* Customizable UI

* Plugins + Script Engine Design

* Malicious code scanning API

* Translated Into over 30 Languages Including: Arabic, German, Japanese, Mandarin, Russian, Spanish)

* Export functionality as Runnable Jar, Zip, APK, Decompile All As Zip, Etc.

* And more! Give it a try for yourself!



#### Command Line Input

```

	-help                         Displays the help menu

	-clean                        Deletes the BCV directory

	-english                      Forces English language translations

	-list                         Displays the available decompilers

	-decompiler       Selects the decompiler, procyon by default

	-i                Selects the input file (Jar, Class, APK, ZIP, DEX all work automatically)

	-o               Selects the output file (Java or Java-Bytecode)

	-t          Must either be the fully qualified classname or "all" to decompile all as zip

	-nowait                       Doesn't wait for the user to read the CLI messages

```



## What is Bytecode Viewer?

Bytecode Viewer (BCV) is an Advanced Lightweight Java/Android Reverse Engineering Suite. Powered by several open source tools BCV is designed to aid in the reversing process.



BCV comes with 6 decompilers, 3 disassemblers, 2 assemblers, 2 APK converters, advanced searching, debugging & more.



It's written completely in Java, and it's open sourced. It's currently being maintained and developed by Konloch.



## Is there a demo?

[![BCV Demo](https://img.youtube.com/vi/I5GT6PoTGOw/0.jpg)](https://www.youtube.com/watch?v=I5GT6PoTGOw)



Please note this demo is from a very old version



## How do I install BCV?

Download the latest version from https://github.com/konloch/bytecode-viewer/releases and run the Bytecode-Viewer-2.10.x.jar.

You may need to execute it via command line ```java -jar Bytecode-Viewer-2.10.x.jar``` (replace the X with the current minor version)



## How can I use BCV?

* Starting with a Jar, Zip, ClassFile or Android file (APK, DEX, XAPK, etc) drag it into BCV. It will start the decoding process automatically.

* From here you can select the decompilers you would like to use by selecting the View Pane>View 1, View 2, View 3, etc.

* The view panes are-used to display up to 3 decompilers side by side, you can also toggle edibility here.

* Select the resource you would like to open by navigating using the resource list, BCV will do its best to display it (Decompiling, Disassembling, etc).

* You can use plugins to help you search along with using the search pane in the left-hand bottom corner.



## How do the plugins work?

There is also a plugin system that will allow you to interact with the loaded classfiles. You could for example write a String deobfuscator, a malicious code searcher, or anything else you can think of.



You can either use one of the pre-written plugins, or write your own. The plugin system supports java and javascript scripting.



Once a plugin is activated, it will execute the plugin with a ClassNode ArrayList of every single class loaded in BCV, this allows the user to handle it completely using ASM.



## Instructions to compile



Just clone this repo and run ``mvn package``. It's that simple!



## Working on the source



Open the Maven project (e.g. in IntelliJ, open the ``pom.xml`` as a project file).



## UI Is Lagging

Change the theme to your systems. Go into `View->Visual Settings->Window Theme` and select `System Theme`.



## Java Heap Space Issues (java.lang.OutOfMemoryError)

Start BCV with more RAM, e.g. `java -Xmx3G -jar BCV.jar`



## File Permission Issues (java.io.FileNotFoundException)

Right click on the jar file, go to Properties, and select Unblock under Security at the bottom of the General tab.



## APK File Permission Issues (java.io.FileNotFoundException)

Run BCV as administrator.



#### Are you a Java Reverse Engineer? Do you want to learn?

Join The Bytecode Club Today! - https://the.bytecode.club