Accelerated SHA256 with ARM64 crypto extensions? #17414

1. 
   laanwj commented at 9:51 am on November 8, 2019: member

   Quite a lot of ARM64 SoC have cryptography extensions, in Linux look for sha2 feature in /proc/cpuinfo or getauxval(AT_HWCAP) & HWCAP_SHA2 .

   Apparently some impressive speed-ups can be achieved, I’ve heard of 4× to 8× on some SoCs.

   Here is some public domain code by Jeffrey Walton that demonstrates how to use it, using intrinsics (which are the best way to do this kind of thing on ARM): https://github.com/noloader/SHA-Intrinsics/blob/master/sha256-arm.c

   (I’m creating this issue mostly as reminder to myself but if someone wants to pick it up, fine :smile: )

2. laanwj added the label Feature on Nov 8, 2019
3. laanwj renamed this:
   Accelerated SHA256 for ARM64 crypto extensions?
   Accelerated SHA256 with ARM64 crypto extensions?
   on Nov 8, 2019
4. laanwj added the label Android on Nov 8, 2019
5. laanwj added the label Validation on Nov 8, 2019
6. 
   laanwj commented at 8:35 am on January 3, 2021: member

   Seems a duplicate of #13401.
7. laanwj closed this on Jan 3, 2021

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8. laanwj referenced this in commit c23bf06492 on Feb 14, 2022
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