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crypto.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 28 Apr 2010 10:06:01 +0200
branchstable
changeset 5421 8167de96c523
parent 4595 bb08a75832e6
child 5424 8ecbcbff9777
permissions -rw-r--r--
proper licensing information (LGPL-2.1). Hope I get it right this time.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5421
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
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#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# This file is part of CubicWeb.
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
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#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# CubicWeb is free software: you can redistribute it and/or modify it under the
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# terms of the GNU Lesser General Public License as published by the Free
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# Software Foundation, either version 2.1 of the License, or (at your option)
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# any later version.
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#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
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# logilab-common is distributed in the hope that it will be useful, but WITHOUT
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
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# details.
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#
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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# You should have received a copy of the GNU Lesser General Public License along
8167de96c523 proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
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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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"""












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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)














cubicweb