py-bcrypt is an implementation the OpenBSD Blowfish password hashing
algorithm, as described in "A Future-Adaptable Password Scheme" by 
Niels Provos and David Mazieres and related bcrypt-based key derivation
function implemented in OpenBSD libutil.

This system hashes passwords using a version of Bruce Schneier's
Blowfish block cipher with modifications designed to raise the cost
of off-line password cracking. The computation cost of the algorithm 
is parametised, so it can be increased as computers get faster.

Two interfaces are supported: a classic password hashing interface and
a key derivation function (KDF) intended for generating cryptographic
keys.


