cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.

It is currently in early development and isn't recommended for general usage yet. It targets Python 2.6-2.7, Python 3.2+, as well as PyPy.

None of the existing ones work on PyPy, and many of them are unmaintained or are based around very poor implementations of algorithms (i.e ones with known side-channel attacks).