[tor-bugs] #15055 [Core Tor/Tor]: Implement ed25519 link handshake

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#15055: Implement ed25519 link handshake
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.2.9.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.7
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, prop-220,                 |  Actual Points:
  027-triaged-1-in, 028-triaged,                 |
  201511-deferred, 201512-deferred, tor-crypto-  |
  identity, tor-ed25519-proto,                   |
  TorCoreTeam201609, review-group-9              |
Parent ID:  #15054                               |         Points:  parent
 Reviewer:  isis                                 |        Sponsor:
                                                 |  SponsorU-must
-------------------------------------------------+-------------------------

Comment (by isis):

 There's some docstrings for functions in `src/or/routerkeys.c`, which
 didn't have any before and which I ran into during my review, in my
 `feature/15055`
 [https://gitweb.torproject.org/user/isis/tor.git/log/?h=feature/15055
 branch]. (I also marked some other functions in that module with DOCDOC,
 because I didn't need to figure out what they do at the moment.)

 I'm about halfway done with review (on gitlab).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15055#comment:37>
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