[tor-bugs] #22052 [Core Tor/Tor]: Synchronize prop224 key blinding spec with implementation

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#22052: Synchronize prop224 key blinding spec with implementation
------------------------------+------------------------------------
     Reporter:  asn           |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.1.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs prop224 ed25519
Actual Points:                |  Parent ID:  #21888
       Points:  1             |   Reviewer:
      Sponsor:                |
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 In our ed25519 key blinding code we have a few pieces that are not in the
 spec. At the very least we have the following constant strings that get
 hashed, which are not mentioned in the spec:
 {{{
   const char str[] = "Derive temporary signing key";
 ...
   const char str[] = "Derive temporary signing key hash input";
 }}}

 We should eye the implementation for any other unspecified parts, and bake
 them in the spec.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22052>
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