IETF
suit
suit@jabber.ietf.org
Wednesday, March 27, 2019< ^ >
Rich Salz has set the subject to: SUIT at IETF 103
Room Configuration
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[08:01:41] <Ludwig Seitz> Hello I'm going to be your Jabber scribe, if you want me to relay your comments to the mic, please prefix them with "mic:"
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[08:28:02] <Ludwig Seitz> Any hands from jabber?
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[08:28:12] <Ludwig Seitz> (for having read the draft)
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[08:33:50] <Henk Birkholz> an editoral "problem" is thr cddl tooolchain
[08:33:56] <Henk Birkholz> unfortunatly
[08:34:12] <Kaspar Schleiser> Here's preliminary code size comparison in RIOT's use case:
[08:34:14] <Henk Birkholz> oh sorry
[08:34:29] <Henk Birkholz> that comment was for the manifest, that s upcoming :-)
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[08:34:47] <Henk Birkholz> coming over in any case :-)
[08:35:04] <Kaspar Schleiser> total size for upgrading code, without cose security checking, is ~2.5kB for v1 vs ~4kB on v4 of Brendans draft.
[08:35:23] <Kaspar Schleiser> that includes tinycbor with 1.4kB, coap glue code with ~750b in both versions.
[08:35:33] synp has set the subject to: SUIT at IETF 104
[08:35:42] <Kaspar Schleiser> plain manifest code is 600b vs. ~2.5kB.
[08:37:08] <Kaspar Schleiser> funcionally they're equivalent, with v4 doing some extra work (it choses correct image depending on currently runningslot, v1 needs to be fed the right manifest for the right slot).
[08:38:07] <Kaspar Schleiser> RIOT has a very simple use case: stupid bootloader, two fixed-size slots, (each slot needs a specifically linked image).
[08:39:28] <Kaspar Schleiser> I think the extra code size could be partly mitigated by a slightly more suitable CBOR parser.
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[08:40:02] <Kaspar Schleiser> but implementation wise, the extra flexibility comes at quite a price.
[08:40:26] <Koen Zandberg> Kaspar: There is also probably some room for optimization in our code here and there :)
[08:40:56] <Dave Thaler> do you want anything relayed to the mic?
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[08:43:36] <ludwig seitz_> Jabber scribe online again, sorry for that, network problems, also: what Dave said
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[08:46:14] <Henk Birkholz> yeah, am in room due to that
[08:46:47] <Henk Birkholz> I am -in- the room and have no video
[08:47:19] <ludwig seitz> Do you have audio?
[08:47:36] <Kaspar Schleiser> Koen: definitely ;)
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[08:49:13] <Henk Birkholz> I also always had a nice video of brendan :-)
[08:49:22] <Henk Birkholz> but as I am far in the back i wanted preo
[08:49:28] <Henk Birkholz> whcih works now acagin!!!
[08:49:30] <Henk Birkholz> :-)
[08:50:09] <ludwig seitz> Ah you are in the physical room :-)
[08:50:51] <Henk Birkholz> now. due to hick-ups with presentation video
[08:51:10] <Henk Birkholz> it is.... okay enough ;-)
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[09:00:46] <ludwig seitz> Koen we don't hear you
[09:00:55] <Koen Zandberg> :(
[09:01:14] <ludwig seitz> Should I realy something on the mic for you?
[09:01:46] <Koen Zandberg> That would be great, let me type a bit
[09:02:21] <Koen Zandberg> mic: Clarification on the COSE handling would be nice to have, maybe some examples what exactly should be passed to the signature verification
[09:02:52] <Koen Zandberg> Thanks!
[09:03:34] <Kaspar Schleiser> mic: smallest MCU's need simpler!
[09:03:55] <Kaspar Schleiser> a 32k MCU with flash split in half cannot spent 2-4kB on cbor and manifest parsing
[09:04:02] <Kaspar Schleiser> simpler manifest
[09:05:00] <David Brown> I posted a link to an implementation I made that does just that.
[09:05:26] <Kaspar Schleiser> david: what code size do you get with it?
[09:06:26] <David Brown> 1228 bytes of code. Compared with 628 bytes of a simpler format.
[09:07:12] <David Brown> For our smallest devices, we will probably need to embed the existing signature instead of a SUIT manifest.
[09:08:07] <David Brown> This was an implementation of draft 3, I hope to get time to implement draft 4 to have a size comparison.
[09:08:08] <Kaspar Schleiser> thanks. that's definitely more bearable.
[09:08:46] <Dave Thaler> @david, do you want that at the nic?
[09:09:12] <Dave Thaler> mic
[09:09:23] <Dave Thaler> (we assume no unless you prefix with mic:)
[09:09:32] <David Brown> I think Brendan's summary is sufficient
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[09:12:54] <David Brown> mic: Dependencies seem to be restricted to specific versions, not something like semantic versions?
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