Welcome to breakzip! This is a collection of open source utilities for working with Zip files and cracking (hopefully) their encryption key. This project is written and maintained by:

• Mike Stay (stay@pyrofex.net)
• Nash Foster (leaf@pyrofex.net)

The project was generously funded by Sergey Tolmachev Tolsi (Tolsi.ru@gmail.com), to whom we owe many thanks for the opportunity to work on this project.

BUILD

This project was developed on Ubuntu 19, but is known to build on Unbuntu 18. Patches to support other distribution version will be accepted, but the authors do not intend to provide explicit support for general portability. Your mileage may vary.

Dependencies

The following are the necessary packages from Ubuntu 19 which should be installed using apt:

• autotools-dev
• automake
• cmake >= 13.0
• build-essential
• doxygen
• g++-multilib
• libgflags-dev
• libgoogle-perftools-dev (for tcmalloc)
• pkg-config
• texinfo
• libreadline-dev
• libtool

Additionally, you should download and install the following packages from third parties:

• NVIDIA's CUDA Toolkit v10.2 or later

Anti-dependencies

• libsubunit

We don't know why libsubunit causes compile errors, but it does. Remove it from your system before proceeding. If you figure out why it's breaking and can fix it for us, that would be nice.

Third-party

Some dependencies are distributed as source code in our third-party directory. On Ubuntu machines, you should not have to build any dependencies from source. Everything that's not distributed as a working Ubuntu package is included in third-party for you and build by CMake.

This project is not tested using clang, but it may work. You're on your own, but if you make it work, send us a merge request.

Building the Project

Once your system has the needed dependencies, you can build the project by simply running the following command in the root directory.

bash$ ./build.sh

This will produce a build in build.out, including a deb package suitable for installation on your operating system. You can either run the utilities directly from build.out or you can install the deb package with:

bash$ dpkg -i build.out/breakzip-*-Linux.deb

There is also a clean.sh script that can be used to clean the build directories.

If you need to build a debug version, you can do it this way:

bash$ BUILD=Debug ./build.sh

If you are working on changes and want to avoid rebuilding the third-party dependencies on each build, you can accomplish this way:

bash$ TPBUILD=no ./build.sh

Our build is not very large and only takes a few seconds on our systems, but if for some reason you feel it needs to be faster you can increase the make parallelism by editing build.sh. Change the line from make -j 1 and increase the number to however many cores you have.