# File lib/deltacloud/drivers/mock/mock_driver.rb, line 268
  def keys(credentials, opts={})
    check_credentials(credentials)
    result = []
    key_dir = File.join(@storage_root, 'keys')
    Dir[key_dir + '/*.yml'].each do |key_file|
      result << Key.new(YAML::load(File.read(key_file)))
    end
    result = filter_on( result, :id, opts )
    result
  end