[Cryptography] sha1sum speed

[Mark Steward]

Tell me you cached the files first.



Mark

On Sat, Apr 30, 2016 at 5:00 PM, Henry Baker <hbaker1 at pipeline.com> wrote:

> I just run Linux's 'sha1sum' on a number of very large files, and the
> calculation took significantly longer than I expected.
>
> 'sha1sum' is only modestly faster on a very large file than copying the
> file.
>
> I noticed that
> 1) the cpu meter wasn't pinned at 100%; and
> 2) multiple cores weren't being fully utilized.
>
> BTW, I don't care about "SHA1", per se; I could just as easily have used
> "SHA256" or some other hash function.
>
> Questions:
>
> A.  Are there HW speedups today for crypto hash functions?
>
> B.  Are there side-channel issues that are slowing down these hash
> functions?
>
> C.  Are hash function speeds considered important these days?
>
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