I optimize like this
// Copy returns a copy of hash.Hash
func (d *digest) Copy() hash.Hash {
dCopy := *d
return &dCopy
}
But I got error d1.Copy undefined (type hash.Hash has no field or method
Copy) with this code
d1 := sha256.New()
d2 := sha256.New()
d1.Write([]byte("a"))
fmt.Println(d1.Size())
d2 = d1.Copy()
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