JB, Thank you very much for your help.

For adding a copy method direcly on sha256.digest, I propose this

// Copy returns a copy of hash.Hash
func (d *digest) Copy() hash.Hash {
    dh := new(digest)
    dh.h = d.h
    dh.x = d.x
    dh.nx = d.nx
    dh.len = d.len
    dh.is224 = d.is224

    return dh
}


Does this sound correct to you?
(Rem: I am newbie to GO)

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