Re: [TLS] Two draft-22 comments

"Salz, Rich" <rsalz@akamai.com> Fri, 08 December 2017 19:34 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Joseph Birr-Pixton <jpixton@gmail.com>, "tls@ietf.org" <TLS@ietf.org>
Thread-Topic: [TLS] Two draft-22 comments
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Date: Fri, 8 Dec 2017 19:34:24 +0000
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Subject: Re: [TLS] Two draft-22 comments
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➢ That requirement is hard to meet in a library that implements both
    TLS1.2 and TLS1.3 -- a CCS prior to ServerHello would have to be both
    fatally rejected (TLS1.2) and dropped without further processing
    (TLS1.3).
    
Well OpenSSL managed to do it.  I guess I should admit that it could be interpreted as arguing in favor of your point :)  Less flippantly, it’s pretty straightforward: when you get a CCS look at the state and fail or ignore.