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py3k-bcrypt is an implementation the OpenBSD Blowfish password hashing
algorithm, as described in "A Future-Adaptable Password Scheme" by Niels
Provos and David Mazieres:
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.
py3k-bcrypt requires python3.
To install, use the standard Python distutils incantation:
python3 build
python3 install
Regression tests are in the test/ file. This is deliberately in
a subdirectory so it does not mistakenly pick up the top-level bcrypt/
py-bcrypt is licensed under a ISC/BSD licence. The underlying Blowfish
and password hashing code is taken from OpenBSD's libc. See the LICENSE
file for details.
Please report py3k related bugs to Doğan Aydın <> or use github issues. Please check the
TODO file first, in case your problem is something I already know about
(please send patches!)
A simple example that 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"
print "It does not match"
$Id: README,v 2012/04/26 15:38 doganaydin Exp $
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