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Re: [COSE] cose-countersignatures

Russ Housley <housley@vigilsec.com> Sat, 21 November 2020 17:59 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Sat, 21 Nov 2020 12:59:44 -0500
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To: Jonathan Hammell <jfhamme.cccs@gmail.com>
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Subject: Re: [COSE] cose-countersignatures
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The PR is waiting.  I will not do a merge until I hear back from you.

Russ


> On Nov 20, 2020, at 7:37 PM, Jonathan Hammell <jfhamme.cccs@gmail.com> wrote:
> 
> An update...
> I was able to extend my COSE parser to verify the countersignature
> examples from the I-D and I recreated the JSON input for the Examples
> repository (https://github.com/cose-wg/Examples/pull/99).
> 
> I wasn't able to compute a few of the intermediate values due to
> limitations of my code.  The intermediate values that I did not
> compute or verify, I removed from the JSON.  But, important to this
> I-D, I generated and included the ToBeSign_hex in countersignatures
> and used this to successfully verify the ECDSA signature.
> 
> As Michael said, it would be nice if there was a second independent
> implementation to validate.
> 
> As I pointed out in my previous message, these examples do not test
> the CounterSignatureV2 structure.  But I think I'm close enough now
> that I should be able to create some new examples.
> 
> Russ, maybe hold off on the PR for removing those Example stubs.
> 
> 
> Jonathan
> 
> On Thu, Nov 19, 2020 at 7:13 PM Jonathan Hammell <jfhamme.cccs@gmail.com> wrote:
>> 
>> Hi Russ,
>> I cannot find the existing examples from the document in the GitHub
>> Examples repository, despite Appendix A saying that they are there.
>> 
>> Furthermore, the existing examples in the document do not cover the
>> COSE_Sign1 case that was deemed to be the problem with the original
>> countersignature.  I realize that the WG is having difficulty finding
>> someone to produce these examples, but I thought that this omission
>> should be pointed out on the list.
>> 
>> Jonathan
>> 
>> On Mon, Nov 16, 2020 at 5:32 AM Russ Housley <housley@vigilsec.com> wrote:
>>> 
>>> Based on the discussion at the meeting earlier today, I put together a PR:
>>> 
>>>        https://github.com/cose-wg/countersign/pull/2
>>> 
>>> Comments are most welcome.
>>> 
>>> Russ
>>> 
>>> _______________________________________________
>>> COSE mailing list
>>> COSE@ietf.org
>>> https://www.ietf.org/mailman/listinfo/cose

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