reuse introduction circuit as rendezvous circuit
By using the last hop of introduction circuit as RP, we can save the time spent on creating rendezvous circuit and transmitting establish_rendezvous cells (by combining introduce with establish_rendezvous cell).
A malicious hidden service will be able to link introduction circuit with rendezvous circuit anyway. So at first glance, I don't see any issue.
Trac:
Username: dave2008