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Use ring crypto for 10-20% CPU utlilization gain #1914

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Use ring crypto for 10-20% CPU utlilization gain #1914

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Commits on Feb 20, 2021

  1. Use ring crypto for 10-20% CPU utlilization gain 

    Computing SigV4 signatures uses SHA2 for the derivation. The Sha2 crate
does not have architeture optimizations. By using Ring, we now have them
and also they are selected at runtime. This manifests in 10-20% reduction
of CPU utlilization for production workloads.

A lot of `rusoto` users already have transitive dependency on `ring`
through `rustls`, so this removes one more dependency for them.
    @luben
    luben committed Feb 20, 2021
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