hash.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.utils.hash 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