On Mar 6, 2025, at 1:19 PM, Michael Richardson <mcr+i...@sandelman.ca> wrote:
> Assuming that this one implementation fix is easy to do and to deploy[%]
> ubiquitously, then I suggest that RFC7170 document *the above* and the above
> *only* for TEAPv1.  You say as much below.

  I think that's the best approach.  That could also make the document a lot 
clearer.

  i.e. just remove all of the text about the EMSK Compound MAC, and say "not 
implemented".

>> Nothing else works across all implementations.
> 
> Then that's what the document should say.

  OK.   I will issue an update after IETF 122.

> This is a client/desktop/laptop implementation then?
> How far back does it go?  Win10? Win7? WinXP?

  I'd have to look.  Windows 11 at least.  Perhaps Windows 10.  Not earlier.

>> The simplest way forward that I can think of is the following:
> 
>> 1) declare the MSFT behaviour TEAPv0.  Crypto-Binding contains only the
>> MSK Compound MAC, the EMSK Compound MAC is always zero
> 
> Is version 0 even valid?
> What do these old versions declare as their version?

  Sorry, TEAPv1.

  So TEAPv1 is "MSK Compound MAC only".

  TEAPv2 is whatever we decide to do after issuing 7170bis.

  Alan DeKok.

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