hostapd: Recommended way to extract MSK/PMK from EAP-TLS process

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Hello experts,

we are implementing IEEE802.1X device authentication using EAP-TLS (auth by Radius) in a PLC environment.
The PLC transceiver chips  (for which we are developing a wpa_supplicant/hostapd driver) are handling a 4-way handshake similar to the WPA2 process themselves.
We only need to provide the transceivers (on both ends) the PMK (from EAP-TLS auth process).

In wpa_supplicant's side we receive the PMK easily from wpa_suppliant via driver's interface (event callback).

But on hostapd side we are unsure how to get the PMK to our hostapd driver (which seemed to be strored in eap_if.eapKeyData  / eap_if.aaaEapKeyData of the eap state machine data structure)
There seems not to be an event upon Radius Access-Accept which provides this information to drivers.

Any recommendation would be highly appreciated.

Roman

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