NAME
python-bcrypt - a module to implement OpenBSD’s Blowfish password hash
algorithm
This manual page was written for the Debian distribution because the
original program does not have a manual page.
python-bcrypt is a Python module implementating the OpenBSD Blowfish
password hashing algorithm, as described in "A Future-Adaptable
Password Scheme" by Niels Provos and David Mazieres:
http://www.openbsd.org/papers/bcrypt-paper.ps
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.
A simple example demonstrates most of the features:
import bcrypt
# Hash a password for the first time
hashed = bcrypt.hashpw(password, bcrypt.gensalt())
# gensalt’s log_rounds parameter determines the complexity
# the work factor is 2**log_rounds, and the default is 12
hashed = bcrypt.hashpw(password, bcrypt.gensalt(10))
# Check that an unencrypted password matches one that has
# previously been hashed
if bcrypt.hashpw(plaintext, hashed) == hashed:
print "It matches"
else:
print "It does not match"
AUTHOR
python-bcrypt was written by Damien Miller <djm@mindrot.org>
This manual page was written by Kevin Coyner <kcoyner@debian.org> for
the Debian system (but may be used by others). Permission is granted
to copy, distribute and/or modify this document under the terms of the
GNU General Public License, Version 2 any later version published by
the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License
can be found in /usr/share/common-licenses/GPL.
December 22, 2007