crypto.py
author Julien Cristau <julien.cristau@logilab.fr>
Mon, 28 Apr 2014 11:20:26 +0200
changeset 9708 b36bc18f6ef7
parent 7879 9aae456abab5
child 10602 4845012cfc8e
permissions -rw-r--r--
[migration] move 'entities' table changes from 3.19.0 to bootstrap script The 'mtime' and 'source' columns need to go away before we attempt to do anything else with the repo, otherwise any addition of an entity is going to explode.
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# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Simple cryptographic routines, based on python-crypto."""
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__docformat__ = "restructuredtext en"
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from pickle import dumps, loads
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from base64 import b64encode, b64decode
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from Crypto.Cipher import Blowfish
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_CYPHERERS = {}
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def _cypherer(seed):
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    try:
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        return _CYPHERERS[seed]
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    except KeyError:
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        _CYPHERERS[seed] = Blowfish.new(seed, Blowfish.MODE_ECB)
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        return _CYPHERERS[seed]
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def encrypt(data, seed):
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    string = dumps(data)
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    string = string + '*' * (8 - len(string) % 8)
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    string = b64encode(_cypherer(seed).encrypt(string))
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    return unicode(string)
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def decrypt(string, seed):
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    # pickle ignores trailing characters so we do not need to strip them off
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    string = _cypherer(seed).decrypt(b64decode(string))
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    return loads(string)