On Wed, Aug 17, 2022 at 06:44:37PM +0200, Carsten Bormann wrote:
> On 2022-08-17, at 16:54, Russ Housley <housley@xxxxxxxxxxxx> wrote:
> >
> > Generic_Headers /= (
>
> This is unfortunately not doing the right thing, as it tries to turn generic headers into a type choice with a second alternative.
Oh, very good point. I had focused so much on the comments that I missed
the overall action!
> The way Generic_Headers is defined in 8152 does not lend itself to expanding it.
>
> (TBD10 and TBD11 also don’t quite act like generic headers, because you may need to include them in crit.)
>
> The extension point actually is in the second line of the group (8152, Section 3):
>
> header_map = {
> Generic_Headers,
> * label => values ;;; extension point
> }
>
> No socket or similar construct is provided here to make the link to extensions explicit, so unless we want to retrofit our own socket here, I’d just say:
>
> CountersignatureV2_header = (
> TBD10 => COSE_Countersignature / [+COSE_Countersignature]
> )
>
> Countersignature0V2_header = (
> TBD11 => COSE_Countersignature0
> )
That looks promising, yes.
-Ben
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