[tor-bugs] #26839 [Core Tor/Tor]: prop289: Make a relay remember last cell digests before SENDME

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#26839: prop289: Make a relay remember last cell digests before SENDME
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     Reporter:  dgoulet       |      Owner:  dgoulet
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  prop289
Actual Points:                |  Parent ID:  #26288
       Points:                |   Reviewer:
      Sponsor:                |
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 From proposal 289, this would be phase one and quoting:

 In phase one, both sides begin remembering their expected digests, and
 they learn how to parse sendme payloads. When they receive a sendme with
 payload version 1, they verify its digest and tear down the circuit if
 it's wrong. But they continue to send and accept payload version 0
 sendmes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26839>
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