[tor-bugs] #16467 [Tor]: Faster Ed25519 implementation.

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#16467: Faster Ed25519 implementation.
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 Reporter:  yawning                 |          Owner:
     Type:  enhancement             |         Status:  new
 Priority:  normal                  |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor                     |        Version:  Tor: 0.2.7
 Keywords:  performance, tor-relay  |  Actual Points:
Parent ID:  #9663                   |         Points:
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 The `ref10` Ed25519 code currently being used is rather slow, and does not
 support batch verification.  Andrew Moon's `Ed25519-donna`
 (https://github.com/floodyberry/ed25519-donna) is both faster and provides
 batch verification, in addition to the optimized Curve25519 scalar
 basepoint multiply that #9663 depends on.

 We should use Ed25519-donna instead of ref10 for our Ed25519
 implementation, at first with cross-checking/fallback, and eventually as
 our sole Ed25519 provider.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16467>
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