TKIP GroupKey Problem

[Jouni Malinen]

On Fri, Feb 08, 2013 at 08:03:35PM +0100, michael-dev wrote:
> it looks like the longer keys only match the first 16 bytes, but not 
> the second 16 bytes.
> 
> Example (alg=2):
> 
> STA: 5d f6 65 58 55 0c 31 81 18 49 9d fc 61 ac 61 84 83 9c 0a 2e e7 57 
> e1 43 29 15 ab ca 7d f0 c1 b2
> AP: 5d f6 65 58 55 0c 31 81 18 49 9d fc 61 ac 61 84 29 15 ab ca 7d f0 
> c1 b2 83 9c 0a 2e e7 57 e1 43

Please note that TKIP key includes three parts: TK (16 octets), Michael
MIC TX/RX keys (each 8 octet). The Michael MIC TX/RX keys are swapped,
so this type of "difference" is expected. Those keys look identical if
you swap the TX/RX keys.

-- 
Jouni Malinen                                            PGP id EFC895FA