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Distutils2 should provide support for verifying a mirrors authenticity as described in PEP 381 -- Mirror Authenticity.

I have started on an implementation in my distutil2 patch-queue on bitbucket.
Link to code, tests, and documentation:
https://bitbucket.org/khightower/distutils2-patch-queue/qseries?apply=t&qs_apply=mirror-authenticity
Outstanding items include back porting the SSL module for python < 2.6 support and making sure all test pass on python >= 2.4

Some nitpicks:
In mirrors.get_server_key, the documentation is not up to date with your last changes (raises an error if there is a problem instead of returning None)
You do use the name 'package' while talking about distributions or projects. Please be sure to use the right one on the right place (in your case, that's a project). A project (Django) contains releases (Django 1.1, 1.2, 1.3?) which contains distributions (sdist, bdist).
The "verify_package" name could probably be changed in "is_trustable" or something like that, or raise an error (Otherwise, one can use verify_package thinking that it will actually check for something, without looking at the return value).
In the documentation, you've mainly copy/pasted the PEP and provided examples on how to do the authenticity check with distutils2. 
While the second part is fine, I think that duplicating the PEP content on the documentation is probably an error: If the PEP changes, then the distutils2 documentation have to change as well. You probably can just refer on the PEP with a link.
Adding informations on where did you find the sources of verify.py could be nice as well.
Again, thanks for your work !

Antoine Pitrou on #python-dev made interesting remarks about the validation:
16:19 < __ap__> hmm the way the patch does validation is bogus
16:22 < __ap__> because it opens the URL a first time, validates it,
then opens it a second time with urlopen()
16:22 < __ap__> without verifying the certificate on the second time
16:23 < __ap__> it should do the validation directly with urlopen()
16:23 < __ap__> (which probably requires defining a custom HTTPSHandler)

Thanks for the feedback! I agree with the issues raised and will rework the patch to address them.

Based on the feedback I have updated my patch, please review.
An updated patch attached. Link to my distutils2 mq below:
https://bitbucket.org/khightower/distutils2-patch-queue/qseries?apply=t&qs_apply=mirror-authenticity 

Mirroring protocol is deprecated.