py-libgfshare

A Python ctypes wrapper for libgfshare - http://www.digital-scurf.org/software/libgfshare (download, ./configure, make, make install or cp .libs/libgfshare.so /usr/lib/)

Shamir's method for secret sharing in the Galois Field 2^8. http://en.wikipedia.org/wiki/Shamir's_Secret_Sharing

Usage:

import gfshare
shares = gfshare.split( 7, 2, 'Hello World!' )
gfshare.combine( ( shares[5], shares[2] ) )
gfshare.combine( ( shares[1], shares[6] ) )

Tested on Python 2.7.4 and Python 3.3.1

Current gfshare._fill_random implementation uses Python's random library. It is recommended to reimplement the function yourself more securely (using /dev/random for example).

Todo:

• Wrap new share recombination functionality
• Add Windows and OSX support
• Add setup.py and all the usual goodies
• Simpler _fill_random interface, to avoid using ctypes in client

Code comes without any warranty of any sorts. Bug reports and contributions more than welcome.