[tor-bugs] #15056 [Core Tor/Tor]: Support ed25519 identities for circuit extension

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#15056: Support ed25519 identities for circuit extension
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  enhancement                          |         Status:
                                                 |  assigned
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.2.9.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.2.7
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-relay, ed25519, prop-220,        |  Actual Points:
  027-triaged-1-in, 028-triaged,                 |
  201511-deferred, tor-crypto-identity, tor-     |
  ed25519-proto TorCoreTeam201609                |
Parent ID:  #15054                               |         Points:  parent
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorU-must
-------------------------------------------------+-------------------------

Comment (by nickm):

 I've started a branch here, as `15056_wip`, based on my #15055 branch.  So
 far, it should (mostly) send ed25519 identities in extend2 cells as
 appropriate.

 The accepting part will be a little harder.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15056#comment:22>
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