VirtualMailManager/pycompat/hashlib.py
author Pascal Volk <user@localhost.localdomain.org>
Tue, 07 Aug 2012 23:55:41 +0000
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child 675 d24f094d1cb5
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2010 - 2012, 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')