[tor-bugs] #19043 [Core Tor/Tor]: Implementation of prop224 ESTABLISH_INTRO cell

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#19043: Implementation of prop224 ESTABLISH_INTRO cell
-------------------------------------------------+-------------------------
 Reporter:  alec.heif                            |          Owner:
     Type:  enhancement                          |         Status:
                                                 |  needs_revision
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.2.???
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, prop224, 6.s194,             |  Actual Points:
  0210-proposed                                  |
Parent ID:  #17241                               |         Points:  3
 Reviewer:  asn, dgoulet                         |        Sponsor:
                                                 |  SponsorR-must
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Comment (by nickm):

 Replying to [comment:13 asn]:
 >   b) Somehow refactor the current system so that we can do both old-
 style and prop224 mappings using the same data structure. For example, we
 could hash the old-style keys with sha256 and store them in a digest256
 map, and do the same for new style keys as well (or just store the keys
 intact since they are 32bytes).

 This is what I'd suggest.  I'd suggest an underlying data structure
 mapping a tagged structure to a circuit pointer.  If you use the handle
 and the ht code, it should actually be easy.

 Then you can define all the accessor functions, to actually make the code
 safer.

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Ticket URL: <https://troodi.torproject.org/projects/tor/ticket/19043#comment:15>
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