Description of problem:
As of 2.4, PyCrypto now supports Python 3.

I'm attaching a patch to the specfile which adds a new python3 subpackage, as per https://fedoraproject.org/wiki/Packaging:Python#Subpackages so that the src.rpm emits both python 2 and python 3 support in one build.

This also embeds a new patch that was needed to get the benchmarks to run on Python 3 (see the comments in the specfile):

$ diffstat add-python3-subpackage-to-pycrypto.patch
 fix-pubkey-size-divisions.patch |   16 ++++++
 python-crypto.spec              |   96 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 111 insertions(+), 1 deletion(-)