tree 5136af17bad0933f2aa84f2fca27ae2515b1adc8
parent 092acf069813a7a07371de0d05010de80d8e613b
author Ard Biesheuvel <ard.biesheuvel@linaro.org> 1486133376 +0000
committer Herbert Xu <herbert@gondor.apana.org.au> 1486806645 +0800

crypto: ccm - switch to separate cbcmac driver

Update the generic CCM driver to defer CBC-MAC processing to a
dedicated CBC-MAC ahash transform rather than open coding this
transform (and much of the associated scatterwalk plumbing) in
the CCM driver itself.

This cleans up the code considerably, but more importantly, it allows
the use of alternative CBC-MAC implementations that don't suffer from
performance degradation due to significant setup time (e.g., the NEON
based AES code needs to enable/disable the NEON, and load the S-box
into 16 SIMD registers, which cannot be amortized over the entire input
when using the cipher interface)

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>