tree d995dda99428d49482162a955329334b10433a25
parent 9b545c04f7ee41692c11ac7454b25a3f975d70ba
author Tom Cosgrove <tom.cosgrove@arm.com> 1645395931 +0000
committer Tom Cosgrove <tom.cosgrove@arm.com> 1645432646 +0000

SECLIB-667: Accelerate SHA-256 with A64 crypto extensions

Provide an additional pair of #defines, MBEDTLS_SHA256_USE_A64_CRYPTO_IF_PRESENT
and MBEDTLS_SHA256_USE_A64_CRYPTO_ONLY. At most one of them may be
specified. If used, it is necessary to compile with -march=armv8-a+crypto.

The MBEDTLS_SHA256_PROCESS_ALT and MBEDTLS_SHA256_ALT mechanisms
continue to work, and are mutually exclusive with A64_CRYPTO.

There should be minimal code size impact if no A64_CRYPTO option is set.

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>