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Decoder++

Decoder++ is an extensible application designed for penetration testers, software developers, and anyone in between looking to effortlessly decode and encode data across various formats. It includes a wide range of preinstalled scripts and codecs, smart decoding and format identification, and supports both graphical user interface (GUI) and command-line interface (CLI) operations.

Quick Start

Get up and running with Decoder++ in just a few steps:

# Install using pip (latest:qt6)
pip3 install decoder-plus-plus[qt6]

# Or, for a qt5 backport:
pip3 install decoder-plus-plus[qt5]

# To leverage all features and plugins:
pip3 install decoder-plus-plus[extras]

For a detailed installation guide, including platform-specific instructions, see the Installation Guide.

Overview

This section provides an overview about the individual ways of interacting with Decoder++. For additional usage information check out the Advanced Usage section.

Graphical User Interface

The graphical user interface provides two distinct interaction modes: a main-window-mode and a dialog-mode.

Decoder++ Screenshot

While the main-window-mode supports tabbing, the dialog-mode has the ability to return the transformed content to stdout ready for further processing. As a result Decoder++ can enhance other tools/scripts by providing a graphical user interface for flexible transformation of any input.

Decoder++ Screenshot

While Decoder++ processes the entire input text by default, it allows for selective data transformation as well. To transform only a specific portion of your text, simply highlight the necessary text segment in the input field and then apply the desired codec.

Decoder++ Screenshot

Command Line

In addition to the graphical user interface Decoder++ also provides a command line interface:

$ dpp -e base64 -h sha1 "Hello, world!"
e52d74c6d046c390345ae4343406b99587f2af0d

Codecs and Scripts

Decoder++ allows you to choose from a variety of codecs and scripts:

In cases where you require a bit more flexibility Decoder++ allows you to process your data with custom scripts by using the Custom Code script:

Decoder++ Screenshot

Advanced Usage

This section provides additional information about how the command line interface can be used.

Command Line Interface

The commandline interface gives easy access to all available codecs.

To list them the -l argument can be used. To narrow down the search the -l argument accepts additional parameters which work as filter:

$ dpp -l base enc

Codec                 Type
-----                 ----
base16                encoder
base32                encoder
base64                encoder

Decoder++ distinguishes between encoders, decoders, hashers and scripts. Like the graphical user interface the command line interface allows the usage of multiple codecs in a row:

$ dpp "H4sIAAXmeVsC//NIzcnJ11Eozy/KSVEEAObG5usNAAAA" -d base64 -d gzip
Hello, world!

While encoders, decoders and hashers can be used right away, some scripts may require additional configuration. To show all available options of a specific script add the help parameter:

$ dpp "Hello, world!" -s split_and_rejoin help

Split & Rejoin
==============

             Name  Value  Group            Required  Description
             ----  -----  -----            --------  -----------
   split_by_chars         split_behaviour  yes       the chars used at which to split the text
  split_by_length  0      split_behaviour  yes       the length used at which to split the text
rejoin_with_chars                          yes       the chars used to join the splitted text

To configure a specific script the individual options need to be supplied as name-value pairs (e.g. search_term="Hello"):

$ dpp "Hello, world!" -s search_and_replace search_term="Hello" replace_term="Hey"
Hey, world!

Contribute

Feel free to open a new ticket for requesting features or reporting bugs. Also don't hesitate to issue a pull-request for new features/plugins. More information regarding Decoder++ development can be found in the Development Guide.

Thanks to

Troubleshooting

Signals are not working on Mac OS

When starting Decoder++ in Mac OS signals are not working.

This might happen when PyQt6 is installed using homebrew.

Can not start Decoder++ in Windows using CygWin

When starting Decoder++ in CygWin an error occurs:

  ModuleNotFoundError: No module named 'PyQt6'

This might happen even if PyQt6 is installed using pip. Currently there is no fix for that. Instead it is recommended to start Decoder++ using the Windows command line.

No Module PyQt6

When starting Decoder++ the error No module named 'PyQt6.sig' is displayed on the console. This may happen when there are competing versions of PyQt6 installed. Reinstalling PyQt6 should fix this error.

$ sudo pip3 uninstall PyQt6
$ sudo pip3 install PyQt6

Missing Qt6 libraries

At least in Ubuntu 22.04 it might be necessary to install the following packages using apt:

apt install libqt6core6 libqt6network6 libqt6openglwidgets6 libqt6widgets6

X11-forwarding fails

In order to run dpp inside a container/virtual machine you may need to install the qt6-qpa-plugins inside the container/virtual machine and configure the QT_QPA_PLATFORM_PLUGIN_PATH accordingly:

apt install qt6-qpa-plugins
export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/qt6/plugins/platforms/

See the <a href="https://github.com/bytebutcher/decoder-plus-plus/tree/master/docker">Docker build and run scripts</a> for more information regarding how to build and run a Decoder++ Docker container.

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