[tor-bugs] #12498 [Tor]: Implement ed25519 identity keys (prop 220)

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#12498: Implement ed25519 identity keys (prop 220)
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     Reporter:  asn    |      Owner:  nickm
         Type:  task   |     Status:  assigned
     Priority:  major  |  Milestone:  Tor: 0.2.7.x-final
    Component:  Tor    |    Version:
   Resolution:         |   Keywords:  026-triaged-1
Actual Points:         |  Parent ID:
       Points:         |
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Comment (by nickm):

 So, I should re-summarize status:

 This is NOT a complete implementation of proposal 220.

 This branch DOES contain a complete implementation of proposal 228, and an
 initial implementation of proposal 220: the parts about managing ed25519
 keys, advertising them, signing with them, pinning them, and voting on
 them.

 Still to implement in this ticket:
   * Change handling of certificate validity times in descriptors so that a
 descriptor is either valid or not.
   * Make sure that we regenerate new signing keys as needed.
   * Only try to load master key in init_ed_keys() when we're making a
 signing key cert.

 Still to implement in other tickets:
   * Link handshake.
   * Circuit extension handshake
   * Support offline master identity keys.
   * Support new link identifiers in EXTEND cells
   * Write a proposal for eventually removing RSA1024 identities
   * Write a proposal for deprecating TAP
   * User interface for identifying nodes by ed25519 key
   * Family support for ed25519 keys (or some other family thing)
   * Other stuff in prop220
   * Controller interface
   * Bridge identity support with ed25519

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12498#comment:13>
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