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Re: Curve25519/448 key agreement for SSH



Matt Johnston <matt%ucc.asn.au@localhost> writes:

> On Tue, Nov 17, 2015 at 04:26:57PM +0100, Niels Möller wrote:
>> denis bider <ietf-ssh3%denisbider.com@localhost> writes:
>> 
>> > Overall, though, it seems to be a bikeshed issue - it doesn't
>> > really matter either way.
>> 
>> I'd really like to hear more opinions.
>
> Dropbear implements curve25519-sha256%libssh.org@localhost. My 2c is
> to stick with K as an mpint just to avoid unnecessary
> change/confusion with RFC 4253 (7.2, deriving keys) and 5656. 
> In terms of implementation a fixed 32 byte string would have
> been simpler, but not worth changing. 

Agreed.

> A small thing, 'k' in draft-josefsson-ssh-curves-01 should
> probably be upper case? 

Yep, fixed.

> Is it worth keeping the "Verify that client public key length is 32
> bytes" (or 56)
> text of curve25519-sha256%libssh.org.txt@localhost ?

I added it.

/Simon

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