Re: Default Transform for same-doc references

Thank you very much Christian!

It is extra good to get the information from "the man, the myth, the legend", who in fact
wrote the C14N library I'm using :-)

Sometimes the Internet really rocks!

best
Anders

----- Original Message ----- 
From: "Christian Geuer-Pollmann" <Christian.Geuer-Pollmann@microsoft.com>
To: "Anders Rundgren" <anders.rundgren@telia.com>; <w3c-ietf-xmldsig@w3.org>
Sent: Monday, April 24, 2006 10:01
Subject: RE: Default Transform for same-doc references



Anders,

Your right both times. 

(1) The CanonicalizationAlgorithm in the SignedInfo does not change the
default c14n for a Transforms chain, so there is no "inheritance" or so.


(2) When you want excl-c14n at the end of a transforms chain, you must
explicitly mention that (as you did in your example).

Best,
Christian

-----Original Message-----
From: w3c-ietf-xmldsig-request@w3.org
[mailto:w3c-ietf-xmldsig-request@w3.org] On Behalf Of Anders Rundgren
Sent: Sonntag, 23. April 2006 20:31
To: w3c-ietf-xmldsig@w3.org
Subject: Default Transform for same-doc references


It *seems* that a Reference that references the same document does not
"inherit"
canonicalization from SignatureInfo but rather use
http://www.w3.org/TR/2001/REC-xml-c14n-20010315
Have I got this correct? 

If I use exclusive canonicalization(
http://www.w3.org/2001/10/xml-exc-c14n# ) in SignedInfo, I assume that
it would be logical to use this also for a
http://www.w3.org/2000/09/xmldsig#enveloped-signature
But then I need TWO Transform elements!

<Transforms>
  <ds:Transform
Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
  <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
</Transforms>

Right?

thanx
Anders Rundgren