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Ard Biesheuvelherbertx
Ard Biesheuvel
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herbertx
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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>
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‎crypto/Kconfig

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@@ -263,6 +263,7 @@ comment "Authenticated Encryption with Associated Data"
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config CRYPTO_CCM
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tristate "CCM support"
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select CRYPTO_CTR
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select CRYPTO_HASH
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select CRYPTO_AEAD
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help
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Support for Counter with CBC MAC. Required for IPsec.

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