crypto.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 15 Apr 2014 11:55:37 +0200
changeset 9790 0872ac2a1db0
parent 7879 9aae456abab5
child 10602 4845012cfc8e
permissions -rw-r--r--
[testlib] call init_config once the config has been properly bootstraped This should be done right after repository instantiation and as such involves giving CWTC.init_config as a callback to the test database handler (which will itself gives it to the repository initialization function). This unfortunatly requires to pass the init_config method to the server.init_repository function because it has to be called after the config has been initialized (which is done in Repository.__init__) but before the migration handler is instantiated (which will call 'server_maintainance' hook, hence may require the proper config). Another way to fix this would be to change the initialization sequence, but this is another story. Closes #3749378

# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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# This file is part of CubicWeb.
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# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
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# any later version.
#
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
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# You should have received a copy of the GNU Lesser General Public License along
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"""Simple cryptographic routines, based on python-crypto."""
__docformat__ = "restructuredtext en"

from pickle import dumps, loads
from base64 import b64encode, b64decode

from Crypto.Cipher import Blowfish


_CYPHERERS = {}
def _cypherer(seed):
    try:
        return _CYPHERERS[seed]
    except KeyError:
        _CYPHERERS[seed] = Blowfish.new(seed, Blowfish.MODE_ECB)
        return _CYPHERERS[seed]


def encrypt(data, seed):
    string = dumps(data)
    string = string + '*' * (8 - len(string) % 8)
    string = b64encode(_cypherer(seed).encrypt(string))
    return unicode(string)


def decrypt(string, seed):
    # pickle ignores trailing characters so we do not need to strip them off
    string = _cypherer(seed).decrypt(b64decode(string))
    return loads(string)