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According to Wikipedia, every Armv8 processor should support sha256 hashing instructions however /proc/cpuinfo doesn't list it. Could there be a failure to identify the feature by the kernel?

processor   : 3
BogoMIPS    : 108.00
Features    : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part    : 0xd08
CPU revision    : 3
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The answer is, the reason why /proc/cpuinfo doesn't show sha256 support is that ARM Holdings would require a large fee to permit Rpi foundation to include those instructions in the CPU. They didn't pay for them.

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    A reference for this would be nice, even if it is just a link to a discussion somewhere else.
    – goldilocks ♦
    Commented Jun 22, 2021 at 20:38
  • I thought only intel would do such cruel things as selling you CPUs with hardware features built in and hide overclocking and AVX512 behind a pay-wall. But well BMW sells you a car with all bells and whistles only to require a monthly fee to enable seat-heating and other comfort features. And I won't start with Adobe and PANTONE here. Anyway. I see where this is heading…
    – kwasmich
    Commented Nov 15, 2022 at 7:23

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