[tor-bugs] #19301 [- Select a component]: Accept Ed25519 identities in EXTEND2 cells

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#19301: Accept Ed25519 identities in EXTEND2 cells
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     Reporter:  nickm                 |      Owner:
         Type:  enhancement           |     Status:  new
     Priority:  Medium                |  Milestone:
    Component:  - Select a component  |    Version:
     Severity:  Normal                |   Keywords:
Actual Points:                        |  Parent ID:  #15056
       Points:                        |   Reviewer:
      Sponsor:                        |
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 Once we have the link-connection part of prop220 implemented, we can start
 here, and allow relays to start accepting Ed25519 identities in their
 extend2 cells.

 We'll have to update extend_cell_parse to handle these, and extend_cell_t
 to contain them.

 We'll have to update channel_get_for_extend to look up by the complete set
 of link specifiers.

 We'll have to update channel_connect_for_circuit to accept an ed25519 ID,
 if it hasn't already.

 And we'll have to update circuit_extend to handle all that properly.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19301>
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