crypto: arm64/chacha20 - add XChaCha20 support

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Add an XChaCha20 implementation that is hooked up to the ARM64 NEON
implementation of ChaCha20.  This can be used by Adiantum.

A NEON implementation of single-block HChaCha20 is also added so that
XChaCha20 can use it rather than the generic implementation.  This
required refactoring the ChaCha20 permutation into its own function.

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

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Eric Biggers 2018-12-03 19:52:50 -08:00 • committed by Herbert Xu

parent a00fa0c887

commit cc7cf991e9

3 changed files with 125 additions and 43 deletions

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arch/arm64/crypto/Kconfig

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65

arch/arm64/crypto/chacha20-neon-core.S

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99

arch/arm64/crypto/chacha20-neon-glue.c

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