Quick question: I've been looking at the code in
 wg_cookie_message_consume() and wg_receive_handshake_packet(), and as far
as I can tell there's no mechanism that re-initiates a handshake after
receiving a cookie reply to a first handshake other than the  REKEY_TIMEOUT
+ jitter timer.

Is this correct, and do, therefore, all handshakes involving cookies take
at least 5 seconds to complete?

Thanks,
Reid Rankin