crypto.py
author Julien Cristau <julien.cristau@logilab.fr>
Thu, 03 Jul 2014 12:18:34 +0200
changeset 9867 7f36f31d8828
parent 7879 9aae456abab5
child 10602 4845012cfc8e
permissions -rw-r--r--
Added tag cubicweb-version-3.19.2, cubicweb-debian-version-3.19.2-1, cubicweb-centos-version-3.19.2-1 for changeset 8ac2202866e7
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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)