Apologies; my mistake about ~ here. LL
> On Jul 21, 2026, at 2:01 PM, Carsten Bormann <[email protected]> wrote: > > On Jul 21, 2026, at 22:05, Laurence Lundblade <[email protected]> wrote: >> >> It looks like -19 attempted to use ~ (unwrap) to remove the array grouping >> to yield a sequence. But ~ only works on tag numbers, not arrays. > > Let’s clarify that last sentence a bit: > CDDL was defined before CBOR Sequences were being used more heavily. > It therefore has no way to describe a CBOR Sequence directly, only single > CBOR data items (CDDL types, i.e., sets of data items). > > Unwrapping (~) a CDDL Tag data item gives you the content of the tag, which > is another data item (a *type* in CDDL). > Unwrapping a map or an array gives you a *group*, which you can use to build > larger arrays and maps (see example on page 26 of RFC 8610), but which is not > a CBOR Sequence. > Please see Section 4.1 of RFC 8742 for how to handle CBOR Sequences in CDDL. > Essentially, if you use CDDL to describe an array the content of which stands > for a CBOR Sequence, you’ll need to say that. > “The elements of a C509Certificate form a CBOR Sequence. Similarly, the > subsequence of elements described as the group TBSCertificate form a CBOR > Sequence that stands for a similar structure with the issuerSignatureValue > removed at the end.” Or so. > 3.1.12 then says “…the signatureValue is calculated over the CBOR sequence > TBSCertificate." > > Grüße, Carsten > > _______________________________________________ > COSE mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ COSE mailing list -- [email protected] To unsubscribe send an email to [email protected]
