Kernel has an ASM optimized version of SHA512 that was ported from
OpenSSL, so lets package it as it provides significant perfomance
improvement compared to the generic implementation.
There is a Cryptographic Extension based version as well, but that relies
on ARMv8.2 ISA which I am not aware any of the OpenWrt supported SoC-s use.
Signed-off-by: Robert Marko <robimarko@gmail.com>
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