[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
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 Reporter:  cypherpunks             |          Owner:  (none)
     Type:  enhancement             |         Status:  closed
 Priority:  Low                     |      Milestone:
Component:  Core Tor/Tor            |        Version:  Tor: unspecified
 Severity:  Normal                  |     Resolution:  duplicate
 Keywords:  fingerprint descriptor  |  Actual Points:
Parent ID:                          |         Points:
 Reviewer:                          |        Sponsor:
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Comment (by teor):

 Replying to [comment:2 cypherpunks]:
 > Replying to [comment:1 teor]:
 >
 >
 > > There are a few fingerprints that are still in the legacy hex format,
 but their space usage is insignificant compared to 6000 relays.
 >
 > you are very quick in response. i see microdescriptor does not affect
 it.

 Microdescriptors do contain hex fingerprints in family lines. Changing
 them would require a proposal. And we would have to use hex fingerprints
 until every tor version understood base64 fingerprints.

 Maybe we will get a similar benefit when we add ed25519 fingerprints, and
 remove hex sha1 fingerprints.

 > i have looked into my cached-descriptors and found about 2200 family
 lines with containing 23.548 sha1 notation fingerprints = 941kB. base64
 encoded, without trailing =s could result into 635kB only

 Yes, but only relays download descriptors. Most clients do not.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31333#comment:3>
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