On Sat, Sep 17, 2016 at 02:35:20PM +0000, Salz, Rich wrote:

> > When we added X25519 to BoringSSL, we at the same time started made the
> > server require clients supply a curve list (and otherwise we'd just pick
> > a non-ECDHE cipher), because of this issue. That went in back in December
> > 2015 and it's been running just fine. I'd recommend OpenSSL do the same.
> In other words:  only use ECDHE if client specifies a curve list.  WFM.

If a client offers ECDHE ciphers with no curve list, one might
alternatively just use P-256.  It is likely better than the other
choices.  Most clients will send a curve list.

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