[tor-bugs] #20672 [Core Tor/Tor]: Refactor hashing API

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#20672: Refactor hashing API
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     Reporter:  chelseakomlo  |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.0.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  refactoring
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 It would be useful for the hashing API in crypto.c to have consistent
 success/error retvals.

 For example, some functions return 1 on error, when instead these should
 return negative values for errors. See crypto_digest256 for example.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20672>
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