[tor-bugs] #25678 [Core Tor/Tor]: Clarify how ed25519 extended private keys are used in rend-spec-v3.txt

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#25678: Clarify how ed25519 extended private keys are used in rend-spec-v3.txt
-------------------------+-------------------------------------------------
     Reporter:  asn      |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  tor-spec, review-group-26, review-
     Severity:  Normal   |  group-27, 033-triage-20180320, fast-fix,
                         |  033-included-20180326
Actual Points:           |  Parent ID:  #24342
       Points:           |   Reviewer:
      Sponsor:           |
-------------------------+-------------------------------------------------
 In #24342 we started specifying how extended private keys are used in
 rend-spec-v3.txt but we didn't do it in a complete manner (see comment:9).

 We should improve the state of the spec on this regard.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25678>
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