[tor-bugs] #19160 [Core Tor/Tor]: [prop220] Advertise support for Ed25519 link authentication

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#19160: [prop220] Advertise support for Ed25519 link authentication
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  nickm
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #15055
       Points:  0.1           |   Reviewer:
      Sponsor:                |
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 In order to (finally) have authentication happen with ed25519 on link
 connections, we need to advertise we support it.  Responders just do that
 by unconditionally sending all their certs, and by adding AUTH0002 to
 their AUTH_CHALLENGE cells.  That should make clients do the right thing.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19160>
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