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Re: Pushing all the buttons

• To: Rich Salz <rsalz@d...>
• Subject: Re: Pushing all the buttons
• From: Marc Hadley <Marc.Hadley@S...>
• Date: Mon, 22 Sep 2003 14:13:48 -0400
• Cc: xml-dev@l...
• In-reply-to: <3F6F1BFF.2000205@d...>

On Monday, Sep 22, 2003, at 11:57 US/Eastern, Rich Salz wrote:

>> For the record, there's nothing Java specific about the encoding. 
>> Data is encoded using ASN.1 Packed Encoding Rules (PER). ASN.1 was 
>> around long before Java, PER is not based on Java serialization. I 
>> would expect a C based ASN.1 PER library to perform as well as a Java 
>> equivalent.
>
> Do you force byte alignment within the PER message?
>
All our tests have been with aligned PER.

> This will be comical when using crypto in XML, DER->base64->PER.  :)
>
> Why not use DER?  Hand-coded (or probably more accurately, 
> IDL-compiler-generated) parser could just skip the tags, in most cases 
> the lengths would be single-byte, and you'd get better interop.  Seems 
> like that's closer to the 80/20.
>
Most of the work is involved in the XSD->ASN.1 mapping, substituting an 
alternate encoding (e.g. DER instead of PER) would be fairly 
straightforward. That said, all of our tests have used PER so I 
couldn't comment on the performance impact of switching to DER.

Marc.

--
Marc Hadley <marc.hadley@s...>
Web Technologies and Standards, Sun Microsystems.

• References:
  • Re: Pushing all the buttons
    • From: Rich Salz <rsalz@d...>

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