(.using
 [library
  [lux "*"
   [abstract
    [equivalence (.only Equivalence)]]
   [data
    [binary (.only Binary)]
    ["[0]" sum]
    ["[0]" product]]]]
 ["[0]" /// "_"
  ["[1][0]" hash (.only Hash SHA-1 MD5)]])

(type: .public Status
  (Variant
   {#Unverified}
   {#Partial (Either (Hash SHA-1)
                     (Hash MD5))}
   {#Verified (Hash SHA-1) (Hash MD5)}))

(implementation: any_equivalence
  (Equivalence Any)

  (def: (= _ _)
    true))

(def: .public equivalence
  (Equivalence Status)
  (all sum.equivalence
       ..any_equivalence
       (all sum.equivalence
            ///hash.equivalence
            ///hash.equivalence)
       (all product.equivalence
            ///hash.equivalence
            ///hash.equivalence)
       ))

(def: .public (verified payload)
  (-> Binary Status)
  {#Verified
   (///hash.sha-1 payload)
   (///hash.md5 payload)})