Current development release: onetimepass-master.tar.gz |otp-status-dev|
.. |otp-status-dev| image:: https://api.travis-ci.org/tadeck/onetimepass.png?branch=master .. _otp-status-dev: https://travis-ci.org/tadeck/onetimepass .. _onetimepass-master.tar.gz: https://github.com/tadeck/onetimepass/archive/master.tar.gz
+---------+------------+------------------------------------------------------+ | Version | Date | Changes | +=========+============+======================================================+ | 1.0.1 | 2015-07-31 | - fixed tests and build system, | | | | - extended test coverage with Py3.5, PyPy and PyPy3, | +---------+------------+------------------------------------------------------+ | 1.0.0 | 2015-07-31 | - skipping spaces if they are given in secret, | | | | - test suite made more reliable, | +---------+------------+------------------------------------------------------+ | 0.3.0 | 2014-08-16 | - configurable digest method, | | | | - configurable token length, | | | | - configurable TOTP interval length, | +---------+------------+------------------------------------------------------+ | 0.2.2 | 2013-07-12 | - license clarification, | | | | - removal of compiled documentation from the sources,| +---------+------------+------------------------------------------------------+ | 0.2.1 | 2013-07-12 | - support for unicode secrets, | | | | - preliminary support for Travis CI, | +---------+------------+------------------------------------------------------+ | 0.2.0 | 2013-04-11 | - added compatibility with Python 3.x, | | | | - removed compatibility with Python 2.5 and earlier, | +---------+------------+------------------------------------------------------+ | 0.1.2 | 2013-01-23 | - added automated case fold to secret, | +---------+------------+------------------------------------------------------+ | 0.1.1 | 2013-12-20 | - internal code improvements, | | | | - documentation, | +---------+------------+------------------------------------------------------+ | 0.1.0 | 2011-12-19 | (initial public release) | +---------+------------+------------------------------------------------------+
OneTimePass (actually onetimepass) is a module for generating one-time
passwords, namely HOTPs (HMAC-based one-time passwords) and TOTPs (time-based
one-time passwords). They are used eg. within Google Authenticator application
for Android or iPhone.
To install the library, you can either use pip, or just download it
separately. Installing in pip is the simplest. Assuming you are installing
it system-wide::
$ sudo pip install onetimepass(if you are installing it in virtualenv, you do not need "sudo" part).
Alternatively, you can follow the download link above and unpack in some
directory on your sys.path, or clone it as Git submodule to your own
directory.
You can use this module in the following way:
To get time-based token you invoke it like that::
import onetimepass as otp my_secret = 'MFRGGZDFMZTWQ2LK' my_token = otp.get_totp(my_secret)
.. note::
my_secret is case-insensitive, also spaces are ignored. This means you
can provide your users with more readable representations of the secrets
(eg. mfrg gzdf mztw q2lk instead of MFRGGZDFMZTWQ2LK) and pass them
unchanged to library. Same applies to other functions accepting secrets in
this library.
To get HMAC-based token you invoke it like that::
import onetimepass as otp my_secret = 'MFRGGZDFMZTWQ2LK' my_token = otp.get_hotp(my_secret, intervals_no=3)
where intervals_no is the number of the current trial (if checking on
the server, you have to check several values, higher than the last
successful one, determined for previous successful authentications).
To check time-based token you invoke it like that::
import onetimepass as otp my_secret = 'MFRGGZDFMZTWQ2LK' my_token = 123456 # should be probably from some user's input is_valid = otp.valid_totp(token=my_token, secret=my_secret)
To check HMAC-based token you invoke it like that::
import onetimepass as otp my_secret = 'MFRGGZDFMZTWQ2LK' my_token = 123456 # should be probably from some user's input last_used = 5 # store last valid interval somewhere else is_valid = otp.valid_hotp(token=my_token, secret=my_secret, last=last_used)
where:
last argument (in this case being assigned last_used) is the
number of the last successfully checked interval number (as
valid_totp() will skip it and start checking from the next interval
number)is_valid is being assigned value of False if my_token has not
been identified as valid OTP for given secret (my_secret) and checked
interval range. If it has been successful, is_valid is assigned a
number of the working interval number (it should be saved into the
database and supplied to the function as last argument next time the
password is being checked, so you cannot use the same token again).License for this library is available in LICENSE.rst file, in the same
directory. Online version is available here_.
.. _here: https://github.com/tadeck/onetimepass/blob/master/LICENSE.rst