hashutils.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2013 CERN.
	##
	## Invenio is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License as
	## published by the Free Software Foundation; either version 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio is distributed in the hope that it will be useful, but
	## WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	## General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""
	Invenio hash functions.

	Usage example:
	>>> from invenio.hashutils import md5
	>>> print md5('MyPa$$')

	Simplifies imports of hash functions depending on Python version.
	"""

	try:
	from hashlib import sha256, sha1, md5
	HASHLIB_IMPORTED = True
	except ImportError:
	from md5 import md5
	from sha import sha as sha1
	HASHLIB_IMPORTED = False