> But Section 3.3 of RFC 3079 is not about EAP. It does specify how to
> calculate a 128-bit MasterKey, a 128-bit MasterSendKey, a 128-bit
> MasterReceiveKey, a 128-bit SendSessionKey, and a 128-bit
> ReceiveSessionKey. But how to get an EAP MSK from those is not
> specified.
RFC 5216 describes the relationship between the MSK and the receive
and send keys (which was how the MSK was originally defined in RFC 2716):
Enc-RECV-Key = MSK(0,31) = Peer to Authenticator Encryption Key
(MS-MPPE-Recv-Key in [RFC2548]). Also known as the
PMK in [IEEE-802.11].
Enc-SEND-Key = MSK(32,63) = Authenticator to Peer Encryption Key
(MS-MPPE-Send-Key in [RFC2548]
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