[tor-bugs] #17349 [Tor]: Create an ed25519 shared randomness key for dirauths

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#17349: Create an ed25519 shared randomness key for dirauths
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 Reporter:  asn     |          Owner:
     Type:  defect  |         Status:  new
 Priority:  Medium  |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor     |        Version:
 Severity:  Normal  |     Resolution:
 Keywords:          |  Actual Points:
Parent ID:  #16943  |         Points:
  Sponsor:          |
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Comment (by s7r):

 asn: dgoulet: the code should know how to handle situations where the SR
 key changes during protocol run, even during the run of only one phase of
 the protocol (commit phase or reveal phase).

 Accept any SR key and even multiple different SR keys in the same phase
 for the same directory authority if it is properly linked to the ed25519
 master identity key (which we could include in the consensus).

 Since an expiration date exists, we have a 100% probability that the
 medium term signing key (and implicitly SR key) will expire during a
 protocol run (either commit phase, either reveal phase - doesn't matter).
 Directory authorities should be able to replace medium term signing key
 and HUP/reload/restart Tor at anytime without affecting anything.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17349#comment:6>
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