Quoting Johannes Berg <johannes@xxxxxxxxxxxxxxxx>:
On Sat, 2010-02-27 at 00:44 -0500, Pavel Roskin wrote:
It turns out that mac80211 uses plain AES for CCMP. However, it uses an
asynchronous block cipher "ecb(arc4)" for WEP and TKIP.
I'd like to make CCMP use an asynchronous block cipher. Has anyone
attempted that? Are there any issues I should be aware of?
Well the issue is going to be having to interrupt the flow there and
then pick it back up after crypto. Or you can stick it after the entire
flow and treat it like hw crypto in the card.
I should not have emphasized the "asynchronous" part. It's possible
to call a block cipher synchronously, and that's what the WEP code does:
crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
That encrypts the whole packet at once. The function returns when it's done.
The CCMP code, on the other hand, calls crypto_cipher_encrypt_one() in
a loop for 16 byte long chunks. That would be simply ineffective for
some hardware accelerators.
OK, what really matters is that nobody has replied that it was
attempted and didn't work :-)
--
Regards,
Pavel Roskin
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