Go 1.10 adds MarshalBinary and UnmarshalBinary to each of the hash.Hash 
implementations. You can use those to effectively copy the hash structure.

However, I doubt you would get a performance benefit for a string only 64 
bytes long.

JT

On Wednesday, November 8, 2017 at 9:47:33 AM UTC-8, Christian LeMoussel 
wrote:
>
> I found why.. hash.Hash <https://golang.org/src/hash/hash.go> interface 
> does not have a .Copy,
>
>

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