use wpa_supplicant

I choose WPA-PSK for my wireless router,so the corresponding configure is like following:

$wpa_passphrase ssid passphrase

where passphrase is the router's PSK pass,and it outputs a string which should be assigned to "psk" in wpa_supplicant.conf,like this:

network={
        ssid="ssid"
	proto=WPA
	key_mgmt=WPA-PSK
	pairwise=TKIP
	group=TKIP
	psk=psk	
	priority=2
}