EAP-TEAP Compound MAC calculation

Alan DeKok aland at deployingradius.com
Wed Aug 16 22:27:12 UTC 2023

On Aug 16, 2023, at 4:01 PM, Suriya Shankar <suriya.dshankar at gmail.com> wrote:
> I am trying to calculate the Compound MAC for EAP-TEAP. But the description
> in the rfc 7170 is bit confusing

  Very much so.

  The short answer is that this list is about FreeRADIUS.  If you're implementing an EAP type for another piece of software, there are likely other places to go.

  The FreeRADIUS source code for the compound MAC calculation is in src/modules/rlm_eap/types/rlm_eap_teap.

> Could any please help me in understanding the Compound MAC calculation or
> guide me in the right direction

  Don't read RFC 7170.  It's confusing, and substantially wrong.

  Read the updated document, which is soon to be published:  https://datatracker.ietf.org/doc/draft-ietf-emu-rfc7170bis/11/

  It's not only clearer, but it's what Microsoft / FreeRADIUS / Cisco / hostap / etc. have all done.

  Alan DeKok.

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