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Re: [ietf-dkim] versions, Where is the formal definition of DKIM-Signature?

2018-02-08 11:33:08
On 2/8/2018 9:09 AM, John R. Levine wrote:
They seek to distinguish important differences in processing for what is claimed to be the /same/ protocol.

Except really they don't.

Except when they do.  I'm thinking, f'rinstance, that there is a bunch of code in things like Spamassassin that looks at headers and switches out to routines to do stuff with them.  There is nothing in Spamassassin that needs to care whether a DKIM signature is v=1 or v=2, that's all inside the DKIM library.  If it passes a v=2 signature to a library that only knows about v=1, the library will say it's invalid, which isn't ideal but isn't wrong.

the code that tests for the v= parameter could, just as easily, check for the presence of the new features.


Dave Crocker
Brandenburg InternetWorking
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