Apple’s IKEv2 implementation also supports RFC 8420, so we’re also in favor of 
using the same approach here.

Thanks,
Kev Kitchens
He/him/his

> On Sep 23, 2025, at 7:36 AM, Tobias Brunner <tob...@strongswan.org> wrote:
> 
> Hi Scott,
> 
>> The EdDSA approach certainly has its upsides (such as being simpler and
>> removing the 'you need to document that the IKE hash function needs to
>> be as strong' objection that Quynh raised).
>> 
>> My concern would be the short-term implementation difficulty.  Could we
>> have some implementors chime in (either that they already support RFC
>> 8420 or that it wouldn't be difficult to add)?
> 
> strongSwan supports RFC 8420 and we currently already use the same
> "Identity" hash approach for ML-DSA in our prototypical implementation.
> Since X.509 uses pure ML-DSA as well it would be nice to not have to
> implement anything different for IKEv2.
> 
> Regards,
> Tobias
> 
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