If one of the hash functions isn't defined in _hashlib, the code suggests it should just be skipped
===
# this one has no builtin implementation, don't define it
pass
===
This doesn't happen however; due to ImportError not being caught the module decides the whole _hashlib module isn't available and tries to fall back to the older individual libraries. You then get thrown an unrelated error about _md5 being unavailable
You can easily replicate this
---
$ python
Python 2.6.6 (r266:84292, Dec 26 2010, 22:31:48)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
... raise ValueError
...
>>> import _hashlib
>>> _hashlib.openssl_sha224 = foo
>>> import hashlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.6/hashlib.py", line 136, in <module>
md5 = __get_builtin_constructor('md5')
File "/usr/lib/python2.6/hashlib.py", line 63, in __get_builtin_constructor
import _md5
ImportError: No module named _md5
>>>
---
I think the solution is to catch the ImportError in __get_builtin_constructor and, if caught, consider the hash function unsupported
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