AttributeError: 'module' object has no attribute 'digest_size' in PyCrypto

I got above error after I installed PyCrypto and Paramiko on Windows XP ,
Python 2.5.  I saw this error somewhere when I google'd for it, but no
solution was pointed out.
On my Ubuntu box, it runs fine however.
I am by no means an experienced Python programmer, but as most folks will
run into this on Windows regardless of installing a binary PyCrypto distro
or building it from source, the issue is in PyCrypto.Hash.SHA.  The issue is
that Windows file names are not case sensitive.  This library imports itself
rather than - what the author intended - importing the standard sha lib from
Python.  I got it fixed by changing PyCrypto.Hash.SHA as follows:

# Just use the SHA module from the Python standard library

__revision__ = "$Id: SHA.py,v 1.4 2002/07/11 14:31:19 akuchling Exp $"

# from sha import *
# import sha

from hashlib import sha1 as sha
new = sha

blocksize = 1        # legacy value (wrong in any useful sense)
digest_size = 20
digestsize = 20


if hasattr(sha, 'digestsize'):
    digest_size = digestsize
    del digestsize
del sha


Axel

Here the traceback before the fix:

Traceback (most recent call last):
  File "demo_sftp.py", line 30, in <module>
    import paramiko
  File "C:\dev\Python25\lib\site-packages\paramiko\__init__.py", line 69, in
<module>
    from transport import randpool, SecurityOptions, Transport
  File "C:\dev\Python25\lib\site-packages\paramiko\transport.py", line 32,
in <module>
    from paramiko import util
  File "C:\dev\Python25\lib\site-packages\paramiko\util.py", line 31, in
<module>
    from paramiko.common import *
  File "C:\dev\Python25\lib\site-packages\paramiko\common.py", line 107, in
<module>
    randpool = RandomPool()
  File "C:\dev\Python25\lib\site-packages\Crypto\Util\randpool.py", line
101, in __init__
    self._getPos = hash.digest_size
AttributeError: 'module' object has no attribute 'digest_size'