csodium

csodium is a Python 2/3 standalone interface for libsodium.

Rationale

csodium was started as the result of a disagreement with pysodium maintainers. They wanted the library to remain a simple wrapper (using ctypes to dynamically load libsodium at runtime, mainly to always use the latest system available libsodium) while we wanted it to be a standalone package that would work out of the box, especially for Windows/Mac OSX wheel users.

The goal being users should not need to install/compile libsodium and could just do pip install to get things started.

Another point of conflict is the support of Python 3.

As an attempt to make the best out of those two opinions, csodium was initiated, which aims at providing an out-of-the-box, ready-to-use libsodium Python interface while still giving the ability to Linux and OSX users to recompile and/or use the latest available libsodium if they want to.

csodium aims to be compatible with pysodium, but there is no syncing of any kind between the two projects as of now, so their APIs might diverge in the future.

API

csodium aims at offering the whole libsodium API through its Python's bindings. However, it only offers a subset at the moment (crypto_box and crypto_secretbox family functions). I'm the sole contributor which explains why this API support improves slowly. If you are interested in making things faster, adding new functions is actually really simple and pull requests are most welcome ! Here is the guide:

1. Find the exact C prototype of the function you wish to add support for and add it to the _build.py module.
2. Implement a meaningful Python version of that function in the __init__.py module. You can get your inspiration from already defined function.
3. Make sure you handle well incorrect input value and that you raise appropriately on errors. See the _raise_on_error helper function.
4. Write tests that cover input failures as well as at least a successful run. Coverage should remain at 100%. Also remember that the goal is not to test libsodium but the Python binding.
5. Submit your pull request !

Python 2 support on Windows

Sadly, libsodium hasn't been supporting Visual Studio 2008 for a while and this is required to make binary packages for Python 2.7 on Windows. If you know of a simple way to compile libsodium using Visual Studio for Python that doesn't prevent upgrading libsodium, please contribute !

Installation

You may install it by using pip:

pip install csodium