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Re: [tram] [Technical Errata Reported] RFC8489 (6268)

Magnus Westerlund <magnus.westerlund@ericsson.com> Mon, 19 October 2020 08:24 UTC

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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: "petithug@acm.org" <petithug@acm.org>, "renthraysk@gmail.com" <renthraysk@gmail.com>
CC: "jdrosen@jdrosen.net" <jdrosen@jdrosen.net>, "tram@ietf.org" <tram@ietf.org>, "martin.h.duke@gmail.com" <martin.h.duke@gmail.com>, "dwing-ietf@fuggles.com" <dwing-ietf@fuggles.com>, "philip_matthews@magma.ca" <philip_matthews@magma.ca>, "rohan.ietf@gmail.com" <rohan.ietf@gmail.com>
Thread-Topic: [tram] [Technical Errata Reported] RFC8489 (6268)
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Date: Mon, 19 Oct 2020 08:24:14 +0000
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References: <20200830152251.37CA9F4076B@rfc-editor.org> <f48eb512-5c17-20bd-dfd6-2d368e9fd4b9@petit-huguenin.org> <CABNgG1g3Tx1QroP+eo+WeQXxD2XPvf+n67pekBqRi8+QzgX8_Q@mail.gmail.com> <65838ad3-7ee9-3339-1326-8c2d212f6fa6@petit-huguenin.org> <HE1PR0702MB3772F26F7B3E91B8DC6982D695280@HE1PR0702MB3772.eurprd07.prod.outlook.com> <d0498051-d762-855d-bf74-d65a8bdf88da@petit-huguenin.org> <b3cae3bd-2b7f-d8c5-fcb4-55be9f11a3ce@petit-huguenin.org> <CABNgG1hzNyM-qqCpprXBUJ4y-X7OOMZHK72wpPL_rJ+TLXrz-g@mail.gmail.com> <4803aae689ab3839beb9f2a65762001495bc31f8.camel@ericsson.com> <4fb78f8080c69a727fb392d1c4462ffa63fe45c2.camel@ericsson.com> <CABNgG1gXeekROCX4_aHo4RYX8fZg6b967AZEPRRhxTH9PxQdGA@mail.gmail.com> <78fdd4cae92837f303b13e5d9412467fdecca870.camel@ericsson.com> <1b3ee8eb-1d0b-4991-e6c1-f65dd2d4154a@acm.org> <404d19bd2192de644dbc61c64e82605c96446450.camel@ericsson.com> <8786ffe9-d8aa-d112-05fb-b39ac92e27dd@acm.org> <917e9acb845dde2468c7201a846e70c67f527952.camel@ericsson.com> <a1d6cf11-f12c-04ce-a11c-5922668fa75c@acm.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tram/1OXL5v3p58yiLfh0UW6k-9VL5EM>
Subject: Re: [tram] [Technical Errata Reported] RFC8489 (6268)
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Hi Marc,

Your opinion is noted. However, I think a test vector and its description that 
do not contain all information necessary to test is flawed. And as the 
PASSWORD-ALGORITHM attribute is required when the non default algorithm is 
used, I think including it in the message was the right choice. If it hadn't 
been required, I think adding it just in the description text would have been 
sufficient.

I have edited and verified the errata. Thanks for your and Jared's work on 
this one.

Cheers

Magnus

> -----Original Message-----
> From: Marc Petit-Huguenin <petithug@acm.org>
> Sent: den 5 oktober 2020 14:00
> To: Magnus Westerlund <magnus.westerlund@ericsson.com>;
> renthraysk@gmail.com
> Cc: jdrosen@jdrosen.net; tram@ietf.org; martin.h.duke@gmail.com; dwing-
> ietf@fuggles.com; philip_matthews@magma.ca; rohan.ietf@gmail.com
> Subject: Re: [tram] [Technical Errata Reported] RFC8489 (6268)
>
> Hi Magnus,
>
> I still think that this errata misrepresents the purpose of the test-vector. 
> But
> anyway Ren Thraysk provided an updated test vector, so you have
> everything you need to update the errata.
>
> Thanks.
>
> On 9/30/20 1:45 AM, Magnus Westerlund wrote:
> > On Mon, 2020-09-28 at 07:54 -0700, Marc Petit-Huguenin wrote:
> >> On 9/28/20 7:36 AM, Magnus Westerlund wrote:
> >>> Hi,
> >>>
> >>> A question here. Is the key used in the MESSAGE-INTEGRITY-SHA256 the
> >>> MD5 derived one, or one derived using SHA256? If it is the former,
> >>> then fine the lets just add a sentence of clarification as the
> >>> option exist. But, Jared's previous comments appear to indicate the
> >>> the key for the HMAC-SHA256 used in the intergrity was derived using
> >>> SHA256. If it is the later, then I don't see any option than to
> >>> include the password algorithm attribute and its algorithm indicator
> >>> as it is a necessary component to correctly derive the key and thus
> >>> being able to verify the MESSAGE-INTEGRITY.
> >>
> >> SHA256.
> >
> > So in this case then the PASSWORD-ALGORITM attribute is required
> > unless I missinterpret the RFC. I understand that there is some work
> > in preparing the message and calculate the integrity. However, in this
> > case it is necessary information and a mandated value so can you
> > please prepare a new message with the attribute include indicating the
> correct value?
> >
> >
> > Cheers
> >
> > Magnus Westerlund
> >
>
> --
> Marc Petit-Huguenin
> Email: marc@petit-huguenin.org
> Blog: https://protect2.fireeye.com/v1/url?k=0253d662-5cf31424-025396f9-
> 86fc6812c361-cd3793f947751b4e&q=1&e=dd8e5a14-0502-4bdd-8bfa-
> 1a8054092e68&u=https%3A%2F%2Fmarc.petit-huguenin.org%2F
> Profile: https://www.linkedin.com/in/petithug

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