[tor-bugs] #19565 [Core Tor/Tor]: SR: Use trunnel for the shared random value construction

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#19565: SR: Use trunnel for the shared random value construction
------------------------------+----------------------------
     Reporter:  dgoulet       |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Low           |  Milestone:  Tor: 0.2.???
    Component:  Core Tor/Tor  |    Version:
     Severity:  Minor         |   Keywords:  tor-sr dirauth
Actual Points:                |  Parent ID:
       Points:  0.5           |   Reviewer:
      Sponsor:                |
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 The shared random value (SRV) looks like the following for which we could
 use trunnel and avoid doing our binary construction by hand in
 `generate_srv()`

 {{{
     SRV = SHA3-256("shared-random" | INT_8(reveal_num) |
                    INT_4(version) | HASHED_REVEALS | previous_SRV)
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19565>
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