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8bd71350ab
Autobuild-User: Jelmer Vernooij <jelmer@samba.org> Autobuild-Date: Sat Aug 27 17:40:39 CEST 2011 on sn-devel-104
68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
# Copyright (C) 2011 Nominum, Inc.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose with or without fee is hereby granted,
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# provided that the above copyright notice and this permission notice
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# appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""Hashing backwards compatibility wrapper"""
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import sys
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_hashes = None
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def _need_later_python(alg):
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def func(*args, **kwargs):
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raise NotImplementedError("TSIG algorithm " + alg +
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" requires Python 2.5.2 or later")
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return func
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def _setup():
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global _hashes
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_hashes = {}
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try:
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import hashlib
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_hashes['MD5'] = hashlib.md5
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_hashes['SHA1'] = hashlib.sha1
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_hashes['SHA224'] = hashlib.sha224
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_hashes['SHA256'] = hashlib.sha256
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if sys.hexversion >= 0x02050200:
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_hashes['SHA384'] = hashlib.sha384
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_hashes['SHA512'] = hashlib.sha512
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else:
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_hashes['SHA384'] = _need_later_python('SHA384')
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_hashes['SHA512'] = _need_later_python('SHA512')
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if sys.hexversion < 0x02050000:
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# hashlib doesn't conform to PEP 247: API for
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# Cryptographic Hash Functions, which hmac before python
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# 2.5 requires, so add the necessary items.
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class HashlibWrapper:
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def __init__(self, basehash):
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self.basehash = basehash
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self.digest_size = self.basehash().digest_size
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def new(self, *args, **kwargs):
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return self.basehash(*args, **kwargs)
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for name in _hashes:
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_hashes[name] = HashlibWrapper(_hashes[name])
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except ImportError:
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import md5, sha
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_hashes['MD5'] = md5
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_hashes['SHA1'] = sha
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def get(algorithm):
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if _hashes is None:
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_setup()
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return _hashes[algorithm.upper()]
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