On Tue, Jun 13, 2017 at 06:57:05PM +0000, Andrei Popov wrote:
> Regarding RFC language, I think we could be more specific:
> 
> 
> 
> 1. A TLS implementation SHOULD/MUST only send 0-RTT application data if the 
> application has explicitly opted in;
> 
> 2. A TLS implementation SHOULD/MUST only accept 0-RTT application data if the 
> application has explicitly opted in;
> 
> 3. When delivering 0-RTT application data to the application, a TLS 
> implementation SHOULD/MUST provide a way for the application to distinguish 
> it from the rest of the application data.

First of these has to be MUST, or you get problems like I outlined
earlier.

And to implement checking for client only sending "safe" data, you need
the second and third.


-Ilari

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