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