[tor-bugs] #21871 [Core Tor/Tor]: prop224: Change descriptor format for legacy encryption key

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#21871: prop224: Change descriptor format for legacy encryption key
-----------------------------+------------------------------------
 Reporter:  dgoulet          |          Owner:  dgoulet
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  tor-hs, prop224  |  Actual Points:
Parent ID:  #21888           |         Points:  3
 Reviewer:                   |        Sponsor:  SponsorR-must
-----------------------------+------------------------------------
Changes (by dgoulet):

 * status:  accepted => needs_review
 * points:  1 => 3
 * parent:  #20657 => #21888
 * milestone:  Tor: 0.3.2.x-final => Tor: 0.3.1.x-final


Comment:

 Ok, I made it happen afterall but it is built on top of #21895 because it
 needed to extract the private key out of the descriptor and doing that in
 two moves is less messy.

 TOP 2 commits are the one for this branch. Last 2 commits are from #21895.

 Torspec: `ticket21871_01`
 Tor code: `ticket21871_031_01`
 Gitlab review: https://gitlab.com/dgoulet/tor/merge_requests/23

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21871#comment:4>
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