[tor-bugs] #8897 [Tor]: Faster curve25519 implementation for ntor

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#8897: Faster curve25519 implementation for ntor
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     Reporter:  nickm    |      Owner:  nickm
         Type:           |     Status:  needs_revision
  enhancement            |  Milestone:  Tor: 0.2.6.x-final
     Priority:  major    |    Version:
    Component:  Tor      |   Keywords:  tor-relay, performance, ntor,
   Resolution:           |  026-triaged-0
Actual Points:           |  Parent ID:  #9662
       Points:           |
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Comment (by nickm):

 Based on profile information from #11332, maybe we should let this take a
 back-seat for a while.

 Having a look at Andrea's results in "tor-
 58f4200789d0cc47ebd88f3091207cf4dd493573-profile-run.gprof.txt", I see
 7956 calls to onion_skin_ntor_server_handshake vs 78824 to
 onion_skin_TAP_server_handshake().  But curve25519_donna accounts for less
 than .01% of total runtime.  If we imagine that we replaced all of the TAP
 handhakes with ntor handshakes, that would still be only about 0.07% of
 runtime.

 Possibly it's just not worth our time to optimize this stuff right now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8897#comment:15>
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