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UPSTREAM: crypto: x86/chacha - expose SIMD ChaCha routine as library function

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Wire the existing x86 SIMD ChaCha code into the new ChaCha library
interface, so that users of the library interface will get the
accelerated version when available.

Given that calls into the library API will always go through the
routines in this module if it is enabled, switch to static keys
to select the optimal implementation available (which may be none
at all, in which case we defer to the generic implementation for
all invocations).

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 84e03fa39fbe95a5567d43bff458c6d3b3a23ad1)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I6053c5023c6fd9f914b9ebdbf04683c20c8675d0
This commit is contained in:
Ard Biesheuvel 2019-11-08 13:22:10 +01:00 • committed by Alexander Martinz
commit ddb77ae428
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3 changed files with 73 additions and 25 deletions
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crypto/Kconfig
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@ -1459,6 +1459,7 @@ config CRYPTO_CHACHA20_X86_64
depends on X86 && 64BIT
select CRYPTO_BLKCIPHER
select CRYPTO_LIB_CHACHA_GENERIC
select CRYPTO_ARCH_HAVE_LIB_CHACHA
help
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,
XChaCha20, and XChaCha12 stream ciphers.