1 # copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

     2 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

     3 #

     4 # This file is part of CubicWeb.

     5 #

     6 # CubicWeb is free software: you can redistribute it and/or modify it under the

     7 # terms of the GNU Lesser General Public License as published by the Free

     8 # Software Foundation, either version 2.1 of the License, or (at your option)

     9 # any later version.

    10 #

    11 # CubicWeb is distributed in the hope that it will be useful, but WITHOUT

    12 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

    13 # FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

    14 # details.

    15 #

    16 # You should have received a copy of the GNU Lesser General Public License along

    17 # with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

    18 """Simple cryptographic routines, based on python-crypto."""

    19 __docformat__ = "restructuredtext en"

    20 

    21 from base64 import b64encode, b64decode

    22 

    23 from six.moves import cPickle as pickle

    24 

    25 from Crypto.Cipher import Blowfish

    26 

    27 

    28 _CYPHERERS = {}

    29 def _cypherer(seed):

    30     try:

    31         return _CYPHERERS[seed]

    32     except KeyError:

    33         _CYPHERERS[seed] = Blowfish.new(seed, Blowfish.MODE_ECB)

    34         return _CYPHERERS[seed]

    35 

    36 

    37 def encrypt(data, seed):

    38     string = pickle.dumps(data)

    39     string = string + '*' * (8 - len(string) % 8)

    40     string = b64encode(_cypherer(seed).encrypt(string))

    41     return unicode(string)

    42 

    43 

    44 def decrypt(string, seed):

    45     # pickle ignores trailing characters so we do not need to strip them off

    46     string = _cypherer(seed).decrypt(b64decode(string))

    47     return pickle.loads(string)