let
  paths = [
    ./this-file-is-definitely-not-there-7392097
    "/and/neither/is/this/37293620"
  ];
in
toString (
  builtins.concatLists (
    map (hash: map (builtins.hashFile hash) paths) [
      "md5"
      "sha1"
      "sha256"
      "sha512"
    ]
  )
)