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authorNathan Huckleberry <nhuck@google.com>2022-05-20 21:14:59 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2022-06-10 11:40:17 +0300
commit34f7f6c3011276313383099156be287ac745bcea (patch)
tree54cceaf783df3b379afd1b6c52a699c5ed8301c4 /crypto/Kconfig
parentc0eb7591c1ed9cbdb0ad796bb56aed13748b55fa (diff)
downloadlinux-34f7f6c3011276313383099156be287ac745bcea.tar.xz
crypto: x86/polyval - Add PCLMULQDQ accelerated implementation of POLYVAL
Add hardware accelerated version of POLYVAL for x86-64 CPUs with PCLMULQDQ support. This implementation is accelerated using PCLMULQDQ instructions to perform the finite field computations. For added efficiency, 8 blocks of the message are processed simultaneously by precomputing the first 8 powers of the key. Schoolbook multiplication is used instead of Karatsuba multiplication because it was found to be slightly faster on x86-64 machines. Montgomery reduction must be used instead of Barrett reduction due to the difference in modulus between POLYVAL's field and other finite fields. More information on POLYVAL can be found in the HCTR2 paper: "Length-preserving encryption with HCTR2": https://eprint.iacr.org/2021/1441.pdf Signed-off-by: Nathan Huckleberry <nhuck@google.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/Kconfig')
-rw-r--r--crypto/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index dfcc3235e918..9b654984de79 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -792,6 +792,15 @@ config CRYPTO_POLYVAL
POLYVAL is the hash function used in HCTR2. It is not a general-purpose
cryptographic hash function.
+config CRYPTO_POLYVAL_CLMUL_NI
+ tristate "POLYVAL hash function (CLMUL-NI accelerated)"
+ depends on X86 && 64BIT
+ select CRYPTO_POLYVAL
+ help
+ This is the x86_64 CLMUL-NI accelerated implementation of POLYVAL. It is
+ used to efficiently implement HCTR2 on x86-64 processors that support
+ carry-less multiplication instructions.
+
config CRYPTO_POLY1305
tristate "Poly1305 authenticator algorithm"
select CRYPTO_HASH