So it looks like you CAN use your routers 64 hex key to setup your Network-applet and Interfaces file.
I took my 64 char hex key and entered it in both the ascii and hex boxes (different times) and then followed page 4 of your doc and generated a psk for the Interfaces file. Entering both (at different times) worked fine. The only problem is at sudo /etc/init.d/networking restart....
* Reconfiguring network interfaces... Error for wireless request "Set Encode" (8B2A) :
invalid argument "0EGgN94V5rER1EAGNw7KIGOTJbfyBNoT3UQEeblubdYLvMZAP yYRk93CwPgGvdR".
That is my real hex key the Network-applet adds to your/my Interfaces file along with another entry for my ESSID, both at the bottom of the file. Delete them and restart networking and you get just an OK and no error.
AES works fine...same key I always had...no wpa_supplicant.conf file used.
Thanx weiman01...great HowToo....I just needed to understand the process a little better and not rely on what I thought was the correct procedure...read page 4