code: func Armor62OpenWithValidation(msg string, hc HeaderChecker, fc FrameChecker) (body []byte, brand string, header string, footer string, err error) {
  	return armorOpen(msg, Armor62Params, hc, fc)
  }
docs: // Armor62OpenWithValidation runs armor stream decoding, but on a string, and it outputs
  // a string. It validates header and footer with the provided checkers (which are optional and can be nil).