[tor-bugs] #22006 [Core Tor/Tor]: prop224: Validate ed25519 pubkeys to remove torsion component

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jun 15 17:07:25 UTC 2017


#22006: prop224: Validate ed25519 pubkeys to remove torsion component
------------------------------------+------------------------------------
 Reporter:  asn                     |          Owner:  asn
     Type:  defect                  |         Status:  needs_review
 Priority:  Medium                  |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor            |        Version:
 Severity:  Normal                  |     Resolution:
 Keywords:  tor-hs prop224 ed25519  |  Actual Points:
Parent ID:  #21888                  |         Points:
 Reviewer:                          |        Sponsor:  SponsorR-can
------------------------------------+------------------------------------

Comment (by asn):

 We discussed this with Nick, and decided that the best course of action
 here might be to do this validation for all HS public keys, and also for
 all received ed25519 public keys but only on the dirauth-side.

 So instead of having clients do validation for all received public keys
 (which can be quite heavy since consensuses contain 7k of them), we do it
 only on the dirauth side.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22006#comment:10>
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