# File lib/openid/consumer.rb, line 854
    def extension_response(extension_name)      
      prefix = extension_name
      
      signed = @query['openid.signed']
      return nil if signed.nil?
      
      signed = signed.split(',')
      extension_args = {}
      extension_prefix = prefix + '.'
      
      signed.each do |arg|
        if arg.index(extension_prefix) == 0
          query_key = 'openid.'+arg
          extension_args[arg[(1+prefix.length..-1)]] = @query[query_key]
        end
      end
      
      return extension_args
    end