VirtualMailManager/pycompat/hashlib.py
author martin f. krafft <madduck@madduck.net>
Mon, 09 Apr 2012 18:10:56 +0200
branchv0.6.x
changeset 504 f180ead60568
parent 366 d6573da35b5f
child 568 14abdd04ddf5
permissions -rw-r--r--
First version of a CatchallAlias class I based the CatchallAlias class in catchall.py heavily on the Alias class, but by copy, not deriving. The two are functionally related, but the implementations are too different because CatchallAliases have no localpart.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010 - 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.pycompat.hashlib
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    VirtualMailManager's minimal hashlib emulation for Python 2.4
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    hashlib.md5(...), hashlib.sha1(...), hashlib.new('md5', ...) and
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    hashlib.new('sha1', ...) will work always.
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    When the PyCrypto module <http://www.pycrypto.org/> could be found in
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    sys.path hashlib.new('md4', ...) will also work.
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    With PyCrypto >= 2.1.0alpha1 hashlib.new('sha256', ...) and
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    hashlib.sha256(...) becomes functional.
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"""
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import md5 as _md5
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import sha as _sha1
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try:
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    import Crypto
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except ImportError:
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    _md4 = None
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    SHA256 = None
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else:
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    from Crypto.Hash import MD4 as _md4
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    if hasattr(Crypto, 'version_info'):  # <- Available since v2.1.0alpha1
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        from Crypto.Hash import SHA256   # SHA256 works since v2.1.0alpha1
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        sha256 = SHA256.new
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    else:
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        SHA256 = None
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    del Crypto
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compat = 0x01
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md5 = _md5.new
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sha1 = _sha1.new
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def new(name, string=''):
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    """Return a new hashing object using the named algorithm, optionally
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    initialized with the provided string.
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    """
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    if name in ('md5', 'MD5'):
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        return _md5.new(string)
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    if name in ('sha1', 'SHA1'):
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        return _sha1.new(string)
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    if not _md4:
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        raise ValueError('unsupported hash type')
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    if name in ('md4', 'MD4'):
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        return _md4.new(string)
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    if name in ('sha256', 'SHA256') and SHA256:
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        return SHA256.new(string)
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    raise ValueError('unsupported hash type')