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Re: [TLS] Extensions "supported_groups" and "key_share" in TLS 1.3

Xuelei Fan <xuelei.fan@vimino.com> Fri, 27 November 2015 02:50 UTC

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Date: Fri, 27 Nov 2015 10:50:40 +0800
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From: Xuelei Fan <xuelei.fan@vimino.com>
To: Dave Garrett <davemgarrett@gmail.com>
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Subject: Re: [TLS] Extensions "supported_groups" and "key_share" in TLS 1.3
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> On Thursday, November 26, 2015 09:12:14 pm Xuelei Fan wrote:
> > Can key_share offers two shares for the same group?
>
> It's currently worded "Clients MUST NOT offer multiple KeyShareEntry
> values for the same parameters", which is a little ambiguous, but I
> interpret this as one share per group. I don't know why you'd need to offer
> more than one, anyway.
>
> Need no more than one.  Then, it may be more simple that key_share does
not define the preference order. The preference order is covered by
supported_groups.

Thanks,
Xuelei

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