WEP fails with Unsupported authentication algorithm (7820)

[Sergey Matyukevich]

Hi Yegor,

> During the transition from wpa_supplicant v2.4 to v2.9 on a legacy
> project I get the following message:
> 
> mgmt::auth
> authentication: STA=7c:dd:90:44:a5:83 auth_alg=7820
> auth_transaction=112 status_code=31962 wep=1 seq_ctrl=0x60a0
> Unsupported authentication algorithm (7820)
> authentication reply: STA=7c:dd:90:44:a5:83 auth_alg=7820
> auth_transaction=113 resp=13 (IE len=0) (dbg=handle-auth)
> 
> My conf file looks like this:
> 
> ctrl_interface=/var/run/wpa_supplicant
> ap_scan=1
> 
> network={
>         ssid="myssid"
>         mode=2
>         frequency=2447
>         key_mgmt=NONE
>         wep_key0="passw"
>         wep_tx_keyidx=0
> }
> 
> This configuration was working in v2.4. I tried v2.6, v2.8, v2.9 and
> master. The same error.
> 
> Any idea?

That looks weird. In this case wpa_supplicant runs in AP mode using WEP
security. However it looks like AUTH frame passed to the function
handle_auth (src/ap/ieee802_11.c) is completely broken.

Could you please provide some details about the platform in use, at least
hardware architecture and kernel version is use ? Maybe this is some kind
of endianness issue. Full wpa_supplicant verbose log would be useful
as well.

Regards,
Sergey