[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):

 Also, having the exact same expiration date with the medium term signing
 key - '''one single expiration date for everything ed25519 key related'''
 means little less code (which is good). Nick already coded Tor to warn in
 advance about this date, want to generate fresh keys, need to generate
 fresh keys and recover for a lot of failure cases. We don't have to
 reinvent the wheel for the SR key and add more lines of code for no
 reward.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17349#comment:7>
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