eap_config::pac_opaque_encr_key field

pac_opaque_encr_key - PAC-Opaque encryption key for EAP-FAST This parameter is used to set a key for EAP-FAST to encrypt the PAC-Opaque data. It can be set to %NULL if EAP-FAST is not used. If set, must point to a 16-octet key.