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

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#8897: Faster curve25519 implementation for ntor
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, performance, ntor,        |  Actual Points:
  curve25519 crypto impl-shopping                |
Parent ID:  #9662                                |         Points:  large
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by Hello71):

 my profiling results indicate that approximately 18% of my x86_64 Fast
 relay's CPU time is spent in curve25519_donna. therefore, using the 7-10%
 number from previously, this optimization will result in overall savings
 of 1.3-1.8%. not huge, but certainly not negligible.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8897#comment:38>
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