[TLS] Some comments about draft-badra-ecdhe-tls-psk-01

<not wearing any hats>

Overall comment: While the technical solution is reasonably defined 
and scoped, do we have any evidence that someone cares about it?
I.e., do we have information suggesting that if this was specified,
it would actually be used in real world? If we don't, let's not 
spend WG time on it...

Some additional comments based on a quick read:

Abstract, "This document updates RFC 4785 and 4279..."; it 
doesn't "update" either of them (in the sense the word "update" 
is usually used when talking about relationships between RFCs);
it just defines additional cipher suites.

Section 2, "First, perform the Elliptic Curve Diffie-Hellman
computation in the same way as for other Diffie-Hellman-based
ciphersuites in [TLS1.0] or [TLS1.1]" Neither document contains
information on how to perform ECDH computations.

Section 2, "Let Z be the value produced by this computation",
Elliptic Curve Diffie-Hellman is somewhat different in this
respect; text should be consistent with RFC 4492 Section 5.10.

Typos/grammar:
"These ciphersuites provides.."
"It specifies as well one.."

>From idnits: Unused Reference: 'RFC2119' is defined on line 160, 
but no explicit reference was found in the text

Best regards,
Pasi 

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