I am investigating how ath9k performs cryptography.
In slide 15 of DEFCON conference 2014 (link
<https://docs.google.com/presentation/d/1CofNlbHs2bLdJuW3VACzAImqesGQoktUTXS6zKgDDKI/edit#slide=id.g371192f19_070>),
it says, ath9k performs cryptography a on software side.
On the other hand, when I look into ath9k source codes, I found somethings
like below:
ath9k/common.c:162-166:
if (ah->sw_mgmt_crypto_rx &&
(rxs->flag & RX_FLAG_DECRYPTED) &&
ieee80211_is_mgmt(fc))
/* Use software decrypt for management frames. */
rxs->flag &= ~RX_FLAG_DECRYPTED;
As I understand, ath9k can choose hw/sw cryptography for management frames.
However, what about data frames? I couldn't find any clue about
cryptography for data frames.
Can I take it as ath9k already performs software cryptography for data
frames and shifts the responsibility of cryptography to mac80211 driver?
And exceptionally for management frames, can ath9k choose hw/sw
cryptography?
Regards,
Jeon.
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