Yes, I much prefer int labels for a small C implementation. Adding support for tstr labels would noticeably increase code size. I hope no one registers a tstr label. It seems unlikely because algorithms are relatively hard to invent and vet.
LL > On Jul 28, 2021, at 5:47 AM, Carsten Bormann <[email protected]> wrote: > > Hi Daisuke, > >> On 2021-07-28, at 13:45, AJITOMI Daisuke <[email protected] >> <mailto:[email protected]>> wrote: >> >> In my opinion, the tstr type for 'kty', 'alg', 'crv' or 'key_ops' is not >> necessary because I think the major advantage of COSE is its compactness,but >> I would like to know what you are assuming as the value of tstr. > > The registrant gets the choice between a text string and an integer. > > https://www.iana.org/assignments/cose/cose.xhtml > <https://www.iana.org/assignments/cose/cose.xhtml> lists the registration > procedures for certain ranges, e.g.: > > https://www.iana.org/assignments/cose/cose.xhtml#algorithms > <https://www.iana.org/assignments/cose/cose.xhtml#algorithms> > > Range <sort_none.gif> Registration Procedures <sort_up.gif> > Strings of length 1 Standards Action With Expert Review > Integer values between -256 and 255 Standards Action With Expert Review > Strings of length 2 Specification Required > Integer values from 256 to 65535 Specification Required > Integer values from -65536 to -257 Specification Required > Strings of length greater than 2 Expert Review > Integer values greater than 65535 Expert Review > > So labels the representations of which would be 1+0 and 1+1 bytes long > require standards action, 1+2, specification required, and 1+>2, expert > review. > > It doesn’t look like anyone has felt a need to register a text string label > for an algorithm ID yet; there are still quite a few 1+1 (and even a few > 1+0!) values available for registration. > > I would expect that, until we run out of codepoints, the registration of text > labels will remain an occurrence for special circumstances (which means we > might not be prepared for text labels when we finally actually need them). > > Grüße, Carsten > > _______________________________________________ > COSE mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/cose
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