[tor-bugs] #27549 [Core Tor/Tor]: hs-v3: Refactor the descriptor cookie computation code

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#27549: hs-v3: Refactor the descriptor cookie computation code
---------------------------------+----------------------------------
 Reporter:  dgoulet              |          Owner:  dgoulet
     Type:  defect               |         Status:  needs_review
 Priority:  Medium               |      Milestone:  Tor: unspecified
Component:  Core Tor/Tor         |        Version:
 Severity:  Normal               |     Resolution:
 Keywords:  tor-hs, refactoring  |  Actual Points:
Parent ID:  #27544               |         Points:
 Reviewer:  asn                  |        Sponsor:
---------------------------------+----------------------------------

Comment (by asn):

 I pushed a fixup on my branch `ticket27549_035_01` that kills the helper
 functions to simplify the patch.

 The helper functions did not help with simplifying the code or with making
 it more abstract since the underlying code still needed to know the
 structure of keys to do:
 {{{
 -  memcpy(client_out->client_id,
 -         get_client_id_from_keys(keystream), HS_DESC_CLIENT_ID_LEN);
 }}}

 Please review and mark as merge_ready if you like it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27549#comment:11>
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