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Re: Minutes 99-October-28

From: Donald E. Eastlake 3rd <dee3@torque.pothole.com>
Date: Thu, 28 Oct 1999 21:52:30 -0400
Message-Id: <199910290152.VAA11196@torque.pothole.com>
To: "IETF/W3C XML-DSig WG" <w3c-ietf-xmldsig@w3.org>
Hi,

From:  "Joseph M. Reagle Jr." <reagle@w3.org>
Resent-Date:  Thu, 28 Oct 1999 20:19:20 -0400 (EDT)
Resent-Message-Id:  <199910290019.UAA19355@www19.w3.org>
Message-Id:  <3.0.5.32.19991028201854.0092eac0@localhost>
Date:  Thu, 28 Oct 1999 20:18:54 -0400
To:  "John Boyer" <jboyer@uwi.com>
Cc:  "Jim Schaad (Exchange)" <jimsch@EXCHANGE.MICROSOFT.com>,
            "IETF/W3C XML-DSig WG" <w3c-ietf-xmldsig@w3.org>
In-Reply-To:  <NDBBLAOMJKOFPMBCHJOIOEOBCBAA.jboyer@uwi.com>

>At 14:19 99/10/28 -0700, John Boyer wrote:
> >What do you mean "There it was still:"
> >
> >As I recall, it was an element (which I liked), it got changed to an
> >attribute (which I didn't like), I recommended that it stay an element and
> >put the URL as an HREF for the Location element, I heard nothing, and it is
> >still an attribute according to the Oct 22 draft on our website.
> >
> >Are you looking at a newer draft and if so, can I have one?
>
>Woops, yes you are correct, it actually appears as 
>    <ObjectReference Location="http://www.ietf.org"> 
>in [1].
>
>The reasons for the change still hold from my earlier email (trying to be
>syntactically consistent), it just got reflected in the draft earlier.
>However, one could ask shouldn't DigestMethod also be an attribute, and I
>can't find a compelling reason why it shouldn't be... Unfortunately, I'm a

SignatureMethod and DigestMethod can't be represented as attributes
because they can have Parameter* content.

>little lost as to where we are on some of these threads, but I (personally)
>think of the semantics as follows. (I always ask myself what assertions are
>being made.)
>
>The (object) pointed to by ObjectReference has a location of
>http://www.ietf.org
>The (object) pointed to by ObjectReference has a DigestValue (object)
>        DigestValue (object) has an algorithm of urn:nist-gov:sha1
>        DigestValue (object) has an encoding of Base64
>        DigestValue (object) has a literal value of a23bcd43
>
>(See [2] for my take on what our current data model is.)
>
>This could directly translate to the following syntax -- among others,
>depending on your conventions.
>
>    <ObjectReference Location="http://www.ietf.org"> 
>      <DigestValue Algorithm="urn:nist-gov:sha1" 
>                Encoding="urn:ietf-org:base64">a23bcd43</DigestValue> 
>    </ObjectReference> 

There is no place for DigestMethod parameters in the above structure
and two telecons ago people on the call liked the parallelize of
having 

>[1] http://www.w3.org/TR/1999/WD-xmldsig-core-19991022.html
>[2] http://www.w3.org/Signature/Drafts/xmldsig-datamodel-19991025.gif
>
>
>_________________________________________________________
>Joseph Reagle Jr.   
>Policy Analyst           mailto:reagle@w3.org
>XML-Signature Co-Chair   http://w3.org/People/Reagle/

Thanks,
Donald
Received on Thursday, 28 October 1999 21:52:33 GMT

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