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Re: [dkim-ops] RFC 5672 and optional vs. default value of AUID

2010-09-16 14:44:09
On Sep 16, 2010, at 3:13 PM, Murray S. Kucherawy wrote:

-----Original Message-----
From: dkim-ops-bounces(_at_)mipassoc(_dot_)org 
[mailto:dkim-ops-bounces(_at_)mipassoc(_dot_)org] On Behalf Of McDowell, 
Brett
Sent: Thursday, September 16, 2010 11:38 AM
To: dkim-ops(_at_)mipassoc(_dot_)org
Subject: [dkim-ops] RFC 5672 and optional vs. default value of AUID

So, should the signature be processed as if the default value for the
AUID (i= value) were present or processed as if the AUID (i= value)
wasn't even part of the specification?

Actually now I'm confused by your use of "processed", so I want to give a 
more precise answer.

If "processed" describes the blob of data fed to the hash function, then the 
absence of "i=" in a signature must of course be reflected in the hashing 
when verifying or it won't verify.  (That is, you don't feed the default 
value explicitly when "i=" is missing or the hash will not match.)

As far as determining the "i=" value once the signature has been processed, 
we do the former; if you ask the library "What was the signer's identity?", 
we will give back either the literal value (if "i=" was present) or the 
specified default value based on "d=" (if "i=" was absent).


I meant the later, thanks for answering.
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