[tor-bugs] #20573 [Core Tor/Tor]: The build_mac() function in hs_descriptor.c should be made generic for the entire code base

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#20573: The build_mac() function in hs_descriptor.c should be made generic for the
entire code base
------------------------------+-------------------------------------
     Reporter:  dgoulet       |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-hs, prop224, crypto
Actual Points:                |  Parent ID:
       Points:  0.2           |   Reviewer:
      Sponsor:  SponsorR-can  |
------------------------------+-------------------------------------
 Move `build_mac()` out of its file, put it in a common place, rename it
 with a better name and improve by adding the length of the salt and mac
 key to the construction so we don't assume fixed size length.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20573>
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