Modern password hashing for your software and your servers
To install bcrypt, simply:
$ pip install bcrypt
Note that bcrypt should build very easily on Linux provided you have a C compiler, headers for Python (if you’re not using pypy), and headers for the libffi libraries available on your system.
For Debian and Ubuntu, the following command will ensure that the required dependencies are installed:
$ sudo apt-get install build-essential libffi-dev python-dev
For Fedora and RHEL-derivatives, the following command will ensure that the required dependencies are installed:
$ sudo yum install gcc libffi-devel python-devel
Hashing and then later checking that a password matches the previous hashed password is very simple:
>>> import bcrypt
>>> password = b"super secret password"
>>> # Hash a password for the first time, with a randomly-generated salt
>>> hashed = bcrypt.hashpw(password, bcrypt.gensalt())
>>> # Check that a unhashed password matches one that has previously been
>>> # hashed
>>> if bcrypt.hashpw(password, hashed) == hashed:
... print("It Matches!")
... else:
... print("It Does not Match :(")
One of bcrypt's features is an adjustable logarithmic work factor. To adjust the work factor merely pass the desired number of rounds to bcrypt.gensalt(rounds=12)
which defaults to 12):
>>> import bcrypt
>>> password = b"super secret password"
>>> # Hash a password for the first time, with a certain number of rounds
>>> hashed = bcrypt.hashpw(password, bcrypt.gensalt(14))
>>> # Check that a unhashed password matches one that has previously been
>>> # hashed
>>> if bcrypt.hashpw(password, hashed) == hashed:
... print("It Matches!")
... else:
... print("It Does not Match :(")
Another one of bcrypt's features is an adjustable prefix to let you define what libraries you'll remain compatible with. To adjust this, pass either 2a
or 2b
(the default) to bcrypt.gensalt(prefix=b"2b")
as a bytes object.
The bcrypt algorithm only handles passwords up to 72 characters, any characters beyond that are ignored. To work around this, a common approach is to hash a password with a cryptographic hash, such as sha512
before hasing it with bcrypt
:
>>> password = b"an incredibly long password" * 10
>>> hashed = bcrypt.hashpw(
... hashlib.sha512(password).digest(),
... bcrypt.gensalt()
... )
This library should be compatible with py-bcrypt and it will run on Python 2.6+, 3.3+, and PyPy.
bcrypt
follows the same security policy as cryptography, if you identify a vulnerability, we ask you to contact us privately.