[tor-bugs] #7098 [Tor]: Add safe-cookie authentication to Extended ORPort and TransportControlPort

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#7098: Add safe-cookie authentication to Extended ORPort and TransportControlPort
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 Reporter:  asn         |          Owner:                    
     Type:  defect      |         Status:  needs_review      
 Priority:  normal      |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor         |        Version:                    
 Keywords:  tor-bridge  |         Parent:  #4773             
   Points:              |   Actualpoints:                    
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Comment(by rransom):

 Why not `HMAC-SHA256(CookieString, "ExtORPort authentication safe cookie
 client-to-server hash" || ClientNonce || ServerNonce)`?  Putting a header
 on the cookie file solves the ‘it might be my Ed25519 secret key’ problem.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7098#comment:16>
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