ALGORITHMS = {
          'http://www.w3.org/2001/04/xmlenc#tripledes-cbc' => Algorithms::DES3CBC,
          'http://www.w3.org/2001/04/xmlenc#aes128-cbc'    => Algorithms::AESCBC[128],
          'http://www.w3.org/2001/04/xmlenc#aes256-cbc'    => Algorithms::AESCBC[256],
          'http://www.w3.org/2009/xmlenc11#aes128-gcm'     => Algorithms::AESGCM[128],