Sosemanuk

Sosemanuk: a Fast Streaming Cipher

Sosemanuk is a fast stream cipher and one of the "winners" of the eSTREAM competition. Sosemanuk effectively creates a one-time pad that is XORed with the data, making encryption and decryption the same operation.
        design strength     128 bits
        key length          1-32 bytes
        IV, aka nonce       0-16 bytes
        chunk size          in increments of 80 bytes
Sosemanuk was created by Come Berbain, Olivier Billet, Nicolas Courtois, Henri Gilbert, Louis Goubin, Aline Gouget, Louis Granboulan, Cedric Lauradoux, Marine Minier, Thomas Pornin and Herve Sibert. Their reference implementation is free software; its license is "as close to Public Domain as any software license can be under French law". See:
http://www.ecrypt.eu.org/stream/sosemanukpf.html
http://www.ecrypt.eu.org/stream/p3ciphers/sosemanuk/sosemanuk_p3.pdf
http://www.ecrypt.eu.org/stream/p3ciphers/sosemanuk/sosemanuk_p3source.zip

pySosemanuk.py is a simple Python ctypes wrapper for the above C implementation of Sosemanuk.
      Usage:
        sm = Sosemanuk(key, IV)
        dataout = sm.encryptBytes(datain)   # same for decrypt
To make your learning and experimentation less cumbersome, pySosemanuk.py is free for any use, but...
Copyright (c) 2007-2011 by Larry Bugbee, Kent, WA
ALL RIGHTS RESERVED.

pySosemanuk.py IS EXPERIMENTAL SOFTWARE FOR EDUCATIONAL PURPOSES ONLY. IT IS MADE AVAILABLE "AS-IS" WITHOUT WARRANTY OR GUARANTEE OF ANY KIND, NO EXCEPTIONS. USE SIGNIFIES ACCEPTANCE OF ALL RISK.
README.txt
pySosemanuk-v0.03.zip

Enjoy,

Larry Bugbee
bugbee@seanet.com
March 12, 2007
rev Dec 2008
rev Jul 2011

Larry Bugbee's Sosemanuk Page

Sosemanuk: a Fast Streaming Cipher