Source code for linotp.lib.dpwOTP
# -*- coding: utf-8 -*-
#
# LinOTP - the open source solution for two factor authentication
# Copyright (C) 2010 - 2014 LSE Leading Security Experts GmbH
#
# This file is part of LinOTP server.
#
# This program is free software: you can redistribute it and/or
# modify it under the terms of the GNU Affero General Public
# License, version 3, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the
# GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#
# E-mail: linotp@lsexperts.de
# Contact: www.linotp.org
# Support: www.lsexperts.de
#
'''
lib for calculating day passwords. (Tagespasswort)
'''
from hashlib import md5
from datetime import datetime
from binascii import hexlify
from linotp.lib.crypt import zerome
import logging
log = logging.getLogger(__name__)
[docs]class dpwOtp:
def __init__(self, secObj, digits=6):
self.secretObject = secObj
self.digits = digits
[docs] def checkOtp(self, anOtpVal, window=0, options=None):
'''
window is the seconds before and after the current time
'''
res = -1
key = self.secretObject.getKey()
date_string = datetime.now().strftime("%d%m%y")
input = key + date_string
md = hexlify(md5(input).digest())
md = md[len(md) - self.digits:]
otp = int(md, 16)
otp = unicode(otp)
otp = otp[len(otp) - self.digits:]
if unicode(anOtpVal) == otp:
res = 1
zerome(key)
del key
return res
[docs] def getOtp(self, date_string=None):
key = self.secretObject.getKey()
if date_string == None:
date_string = datetime.now().strftime("%d%m%y")
input = key + date_string
md = hexlify(md5(input).digest())
md = md[len(md) - self.digits:]
otp = int(md, 16)
otp = unicode(otp)
otp = otp[len(otp) - self.digits:]
zerome(key)
del key
return otp
