With SCTP and SHA-1 the random parameters are exchanged in init and init ack. What is used as HMAC key?

SCTP INIT has client random parameter.
SCTP INIT ACK has server random parameter.

There are no shared keys.
Using SHA-1, what key does the client or server use when performing the HMAC calculation?
Does the sender use their own random pa… Continue reading With SCTP and SHA-1 the random parameters are exchanged in init and init ack. What is used as HMAC key?