Nathan Huckleberry fd94fcf099 crypto: x86/aesni-xctr - Add accelerated implementation of XCTR
Add hardware accelerated version of XCTR for x86-64 CPUs with AESNI
support.

More information on XCTR 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>
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