original hash so that caller can keep writing // and summing. dup := d.Clone() hash := make([]byte, dup.outputLen, 64) // explicit cap to allow stack allocation dup.read(hash) return append(b, hash...) } const ( magicSHA3 = "sha\x08" magicShake = "sha\x09" magicCShake = "sha\x0a" magicKeccak = "sha\x0b" // magic || rate || main state || n || sponge direction marshaledSize = len(magicSHA3) + 1 + 200 + 1 + 1 ) func (d *Digest) MarshalBinary() ([]byte, error) { return d.AppendBinary(make([]byte, 0, marshaledSize))...