crypto.py
author Julien Cristau <julien.cristau@logilab.fr>
Mon, 18 May 2015 16:44:49 +0200
changeset 10439 45e18b4a7466
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child 10602 4845012cfc8e
permissions -rw-r--r--
[devtools] change the way we start/stop postgresql Instead of having the test db handler start a cluster on demand, use the test module's setUp/tearDown callbacks to do it. This allows to have one data directory (and thus cluster) per test module, allowing different test modules to run in parallel, each using its own database cluster whose path is based on the test module.
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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)