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

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#15055: Implement ed25519 link handshake
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 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
 Priority:  High                                 |  assigned
Component:  Core Tor/Tor                         |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.9.x-final
 Keywords:  tor-relay, prop-220,                 |        Version:  Tor:
  027-triaged-1-in, 028-triaged,                 |  0.2.7
  201511-deferred, 201512-deferred, tor-crypto-  |     Resolution:
  identity, tor-ed25519-proto,                   |  Actual Points:
  TorCoreTeam201605                              |         Points:  6
Parent ID:  #15054                               |        Sponsor:
 Reviewer:                                       |  SponsorU-must
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Comment (by nickm):

 Okay, going to try to wrap all this up next week. That will be a
 challenge.  Here are the pieces of it, to break it down into little edible
 bites:
   * Fix #19020.
   * Servers connecting to servers send all correct authentication
 information when protocol permits.
   * Servers receiving connections send all certificates (when protocol
 permits?)
   * Servers receiving connections from servers check authentication
 information, make correct decisions.
   * Anyone connecting to a server checks all certs (if provided)
   * Add an ed25519_id_key item to or_connection_t / channel_t.
   * Index those by ed25519 id.
   * (non)profit.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15055#comment:25>
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