How possible is it to capture and then analyse Tor traffic to/from your local machine (i.e., using wireshark)? I'm interested in more than just website requests / responses; I want to capture all traffic, including things such as circuit creation cells and descriptor publishing.
My attempts to do this so far have failed because I wasn't able to decrypt captured traffic. It should be possible to decrypt the traffic, however, I need a copy of all public/private keypairs used for all encryption on the local machine.
Alternatively is there a good website where these sorts of captures or examples are available for download?