class HexaPDF::DigitalSignature::Handler

def check_certified_signature(result)

Sets an informational message on +result+ whether the signature is a certified signature. 
def check_certified_signature(result)
  sigref = signature_dict[:Reference]&.find {|ref| ref[:TransformMethod] == :DocMDP }
  if sigref && signature_dict.document.catalog[:Perms]&.[](:DocMDP) == signature_dict
    perms = sigref[:TransformParams]&.[](:P) || 2
    result.log(:info, "Certified signature (#{DOCMDP_PERMS_MESSAGE_MAP[perms]})")
  end
end