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# -*- coding: UTF-8 -*-
# Copyright (c) 2010 - 2014, Pascal Volk
# See COPYING for distribution information.
"""
VirtualMailManager.pycompat.hashlib
VirtualMailManager's minimal hashlib emulation for Python 2.4
hashlib.md5(...), hashlib.sha1(...), hashlib.new('md5', ...) and
hashlib.new('sha1', ...) will work always.
When the PyCrypto module <http://www.pycrypto.org/> could be found in
sys.path hashlib.new('md4', ...) will also work.
With PyCrypto >= 2.1.0alpha1 hashlib.new('sha256', ...) and
hashlib.sha256(...) becomes functional.
"""
import md5 as _md5
import sha as _sha1
try:
import Crypto
except ImportError:
_md4 = None
SHA256 = None
else:
from Crypto.Hash import MD4 as _md4
if hasattr(Crypto, 'version_info'): # <- Available since v2.1.0alpha1
from Crypto.Hash import SHA256 # SHA256 works since v2.1.0alpha1
sha256 = SHA256.new
else:
SHA256 = None
del Crypto
compat = 0x01
md5 = _md5.new
sha1 = _sha1.new
def new(name, string=''):
"""Return a new hashing object using the named algorithm, optionally
initialized with the provided string.
"""
if name in ('md5', 'MD5'):
return _md5.new(string)
if name in ('sha1', 'SHA1'):
return _sha1.new(string)
if not _md4:
raise ValueError('unsupported hash type')
if name in ('md4', 'MD4'):
return _md4.new(string)
if name in ('sha256', 'SHA256') and SHA256:
return SHA256.new(string)
raise ValueError('unsupported hash type')
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