Anyone know for sure if the Atheros hardware computes the IV for WEP?

The keytables vary depending on the hardware:
5210 has 64 for keytable size

5211 and 5212 have 128 for keytable size
Just as an example,
WEP 40-bit   = 40-bit  entered key + 24 bit IV = 64-bit

WEP 128-bit  = 128-bit entered key + 24 bit IV = 152-bit
Do we hope to get the IV from the hardware?
  Luis
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No, it doesn't.  The hardware will automatically append the WEP ICV,

Michael hash (if told so) or AES MAC, but the WEP IV resp. AES/TKIP

sequence numbers have to be provided by the host as part of the transmit

buffer.  The IV resp. TSC is located between the 802.11 header and the

data payload.  Note that on all Atheros chips except for the 5210, there

must be a padding between the 802.11 header and the IV/TSC if the header

length is not a multiple of four.
Best regards
Alfred Arnold
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Alfred Arnold                   E-Mail: alfred@ccac.rwth-aachen.de

Computer Club at the            http://john.ccac.rwth-aachen.de:8000/alf/

Technical University            Phone: +49-241-406526

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Wrong. WEP 128-bit = 104-bit entered key + 24 bit IV = 128 bit
Bye, Mike
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That depends on who you ask...marketing guys like bigger numbers and

therefore mean the 104+24 variant when they say 'WEP128'.

Engineers like to be precise and usually say 'WEP104' when they refer to

the 104+24 variant.  Longer WEP key lengths are not mentioned in the

original 802.11 standard.  If you look a bit closer into the 802.11i

document, you will find that the 104+24 variant is called 'WEP104'.  By

the time 802.11i came out, 'WEP128' however already had become such a

widely accepted term that it is difficult to get out of people's heads -

though this marketing term is a major annoyance.  We regularly had

customers who complained that they could only enter 104 bits of key data

for WEP128...
Atheros chips provide both variants (104+24 and 128+24), so it's probably

better to explicitly speak of '40 bit WEP keys' or '104 bit WEP keys' and

avoid the terms WEP64/128 where possible.  I heard that some TI-based

cards even support WEP256 - whatever this means (256+24 or 232+24)...
Best regards
Alfred Arnold
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Alfred Arnold                   E-Mail: alfred@ccac.rwth-aachen.de

Computer Club at the            http://john.ccac.rwth-aachen.de:8000/alf/

Technical University            Phone: +49-241-406526

of Aachen                       Fax:   +49-241-406527
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