[tor-bugs] #31333 [Core Tor/Tor]: reduce fingerprints len by 32.5% to reduce descriptors size

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#31333: reduce fingerprints len by 32.5% to reduce descriptors size
------------------------------------+------------------------------
 Reporter:  cypherpunks             |          Owner:  (none)
     Type:  enhancement             |         Status:  new
 Priority:  Low                     |      Component:  Core Tor/Tor
  Version:  Tor: unspecified        |       Severity:  Normal
 Keywords:  fingerprint descriptor  |  Actual Points:
Parent ID:                          |         Points:
 Reviewer:                          |        Sponsor:
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 I have read proposals to reduce descriptor size and found fingerprints use
 SHA1, why not use base64 for them to change for example:
 moria relay:

 SHA1:
 {{{
 string(40) "9695DFC35FFEB861329B9F1AB04C46397020CE31"
 }}}
 base64 without trailing padding:
 {{{
 string(27) "lpXfw1/+uGEym58asExGOXAgzjE"
 }}}

 pseudocode for example:
 {{{
 substr(base64_encode(hex2bin('9695DFC35FFEB861329B9F1AB04C46397020CE31')),0,27)
 }}}

 results into 32.5% less fingerprints stringlen.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31333>
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