[tor-bugs] #21693 [Core Tor/Tor]: prop224: HS descriptors do wasteful double-base64 encoding

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#21693: prop224: HS descriptors do wasteful double-base64 encoding
-----------------------------+------------------------------------
 Reporter:  asn              |          Owner:  asn
     Type:  task             |         Status:  assigned
 Priority:  Medium           |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  tor-hs, prop224  |  Actual Points:
Parent ID:                   |         Points:  4
 Reviewer:                   |        Sponsor:  SponsorR-can
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Comment (by nickm):

 It's even easier than that  -- you can use tor_gzip_compress and
 tor_gzip_uncompress. No need to involve bufs.

 And what about doing it like this --
 {{{
   outer-layer = header + middle_layer
   middle-layer = b64(encrypt(compressed-part + nul-padding))
   compressed-part = gzip(client_auth_data +
 b64(encrypt(gzip(inner_layer))))
 }}}

 This keeps the length-hiding property of the nul padding, but allows more
 client_auth_data.

 Thoughts?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21693#comment:9>
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