crypto: arm/chacha20 - add XChaCha20 support

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Add an XChaCha20 implementation that is hooked up to the ARM NEON
implementation of ChaCha20.  This is needed for use in the Adiantum
encryption mode; see the generic code patch,
"crypto: chacha20-generic - add XChaCha20 support", for more details.

We also update the NEON code to support HChaCha20 on one block, so we
can use that in XChaCha20 rather than calling the generic HChaCha20.
This required factoring the permutation out into its own macro.

Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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Eric Biggers 2018-11-16 17:26:24 -08:00 • committed by Herbert Xu

parent be2830b15b

commit d97a94309d

3 changed files with 126 additions and 49 deletions

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arch/arm/crypto/Kconfig

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70

arch/arm/crypto/chacha20-neon-core.S

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101

arch/arm/crypto/chacha20-neon-glue.c

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