DGNum/hostapd
6
0
Fork 0
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions

WPS: Prefer PSK format if Enrollee does not advertise Display

Browse source 
Since an Enrollee that does not advertise display as one of the
Config Methods is unlikely to be able to show the ASCII passphrase
to the user, prefer PSK format with such an Enrollee to reduce key
derivation time. This can help with some low-powered devices that
would take long time to derive the PSK from the passphrase.
This commit is contained in:
Jouni Malinen 2009-12-21 12:58:02 +02:00 committed by Jouni Malinen
parent f3f2eeba01
commit b64576fcf5
1 changed files with 22 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
src/wps/wps_registrar.c
View file

@ -1955,7 +1955,28 @@ static int wps_process_config_methods(struct wps_data *wps, const u8 *methods)
m = WPA_GET_BE16(methods);
wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x", m);
wpa_printf(MSG_DEBUG, "WPS: Enrollee Config Methods 0x%x"
"%s%s%s%s%s%s%s%s%s", m,
m & WPS_CONFIG_USBA ? " [USBA]" : "",
m & WPS_CONFIG_ETHERNET ? " [Ethernet]" : "",
m & WPS_CONFIG_LABEL ? " [Label]" : "",
m & WPS_CONFIG_DISPLAY ? " [Display]" : "",
m & WPS_CONFIG_EXT_NFC_TOKEN ? " [Ext NFC Token]" : "",
m & WPS_CONFIG_INT_NFC_TOKEN ? " [Int NFC Token]" : "",
m & WPS_CONFIG_NFC_INTERFACE ? " [NFC]" : "",
m & WPS_CONFIG_PUSHBUTTON ? " [PBC]" : "",
m & WPS_CONFIG_KEYPAD ? " [Keypad]" : "");
if (!(m & WPS_CONFIG_DISPLAY) && !wps->use_psk_key) {
/*
* The Enrollee does not have a display so it is unlikely to be
* able to show the passphrase to a user and as such, could
* benefit from receiving PSK to reduce key derivation time.
*/
wpa_printf(MSG_DEBUG, "WPS: Prefer PSK format key due to "
"Enrollee not supporting display");
wps->use_psk_key = 1;
}
return 0;
}