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crypto: ccm - switch to separate cbcmac driver

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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 <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Ard Biesheuvel 2017-02-03 14:49:36 +00:00 • committed by Herbert Xu
commit f15f05b0a5
2 changed files with 245 additions and 137 deletions
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1
crypto/Kconfig
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@ -263,6 +263,7 @@ comment "Authenticated Encryption with Associated Data"
config CRYPTO_CCM
tristate "CCM support"
select CRYPTO_CTR
select CRYPTO_HASH
select CRYPTO_AEAD
help
Support for Counter with CBC MAC. Required for IPsec.