[tor-bugs] #13399 [Tor]: New digest256map_t type; use it for microdescriptors.

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#13399: New digest256map_t type; use it for microdescriptors.
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 Reporter:  nickm       |          Owner:
     Type:  defect      |         Status:  new
 Priority:  normal      |      Milestone:  Tor: 0.2.6.x-final
Component:  Tor         |        Version:
 Keywords:  tor-client  |  Actual Points:
Parent ID:              |         Points:
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 We store microdescriptors by a 256-bit SHA256 digest of their text.  But
 in some places (e.g. microdescs_add_to_cache) we use a 160-bit prefix of
 the SHA256 digest.  We should just add a digst256map_t type, and use it as
 appropriate.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13399>
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