make_pairs (OpenID::Association)

    # File lib/openid/association.rb, line 111
        def make_pairs(message)
          signed = message.get_arg(OPENID_NS, 'signed')
          if signed.nil?
            raise StandardError, 'Missing signed list'
          end
          signed_fields = signed.split(',', -1)
          data = message.to_post_args
          signed_fields.map {|field| [field, data.fetch('openid.'+field,'')] }
        end