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Re: rsa/oaep

From: Joseph Reagle <reagle@w3.org>
Date: Tue, 28 May 2002 13:47:26 -0400
To: merlin <merlin@baltimore.ie>
Cc: xml-encryption@w3.org
Message-Id: <20020528174728.F2C2F1517@policy.w3.org>
On Friday 24 May 2002 06:11 pm, merlin wrote:
> >I presume not. (I've argued it shouldn't.) Don, do you mind if I make it
> >required?
>
> FWIW, I agree with you. I dislike the fixed SHA-1 for MGF but
> that has been declared final.

On that note...

The RSAES-OAEP-ENCRYPT, as specified in RFC 2437 [ PKCS1], algorithm takes 
two /-optional-/ parameters: a /+MANDATORY+/ message digest function and an 
/+OPTIONAL+/ octet string OAEPparams.

> >> (Aside: The Schema Definition quoted in 5.4.2 is no longer current.)
> >
> >In what way?
>
> 5.4.2: Schema Definition:
>   ...
>   <element name='OAEPparams' minOccurs='0' type='base64Binary'/>
>   <element ref='ds:DigestMethod' minOccurs='0'/>
>   ...
>
> 3.2 Schema Definition:
>   <element name='OAEPparams' minOccurs='0' type='base64Binary'/>
>   <any namespace='##other' minOccurs='0' maxOccurs='unbounded'/>

The definition in 5.4.2 is for demonstration... I couldn't figure out a 
better way to define these schema, but normally, in general, the definition 
3.2 applies, but if you use a specific algorithm [1], then the definition 
in 5.4.2 is the one you should use. Of course, schema doesn't permit one to 
specify this sort of thing... I can get rid of the elipses and use a 
comment:

     <!-- use these element types as children of EncryptionMethod
          when used with RSA-OAEP -->


[1] http://www.w3.org/2001/04/xmlenc#rsa-oaep-mgf1p


-- 

Joseph Reagle Jr.                 http://www.w3.org/People/Reagle/
W3C Policy Analyst                mailto:reagle@w3.org
IETF/W3C XML-Signature Co-Chair   http://www.w3.org/Signature/
W3C XML Encryption Chair          http://www.w3.org/Encryption/2001/
Received on Tuesday, 28 May 2002 13:47:30 GMT

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