Architecture
============

``cryptography`` has three different layers:

* ``cryptography``: This package contains higher level recipes, for example
  "encrypt and then MAC". This is implemented on top of
  ``cryptography.hazmat.primitives``.
* ``cryptography.hazmat.primitives``: This packages contains low level
  algorithms, things like ``AES`` or ``SHA1``. This is implemented on top of
  ``cryptography.hazmat.backends``.
* ``cryptography.hazmat.backends``: This package contains bindings to low level
  cryptographic libraries. Our initial target is OpenSSL.