.. image:: https://travis-ci.org/emulbreh/pyffx.svg?branch=master :target: https://travis-ci.org/emulbreh/pyffx

pyffx

pyffx is a pure Python implementation of Format-preserving, Feistel-based encryption (FFX).

• The FFX Mode of Operation for Format-Preserving Encryption_
• Addendum to “The FFX Mode of Operation for Format-Preserving Encryption”_

Only method 2 is implemented.

See also libffx_

Usage

.. code-block:: python

>>> import pyffx
>>> e = pyffx.Integer(b'secret-key', length=4)
>>> e.encrypt(1234)
6103
>>> e.decrypt(6103)
1234
>>> e = pyffx.String(b'secret-key', alphabet='abc', length=6)
>>> e.encrypt('aaabbb')
'acbacc'
>>> e.decrypt('acbacc')
'aaabbb'

.. _The FFX Mode of Operation for Format-Preserving Encryption: http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/ffx/ffx-spec.pdf .. _Addendum to “The FFX Mode of Operation for Format-Preserving Encryption”: http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/ffx/ffx-spec2.pdf .. _libffx: https://github.com/kpdyer/libffx