(function(root, factory) {
  if (typeof exports === 'object') {
    // CommonJS
    factory(exports, module);
  } else if (typeof define === 'function' && define.amd) {
    // AMD
    define(['exports', 'module'], factory);
  }
}(this, function(exports, module) {

  /**
   * ANONYMOUS `Mechanism` constructor.
   *
   * This class implements the ANONYMOUS SASL mechanism.
   *
   * The ANONYMOUS SASL mechanism provides support for permitting anonymous
   * access to various services
   *
   * References:
   *  - [RFC 4505](http://tools.ietf.org/html/rfc4505)
   *
   * @api public
   */
  function Mechanism() {
  }
  
  Mechanism.prototype.name = 'ANONYMOUS';
  Mechanism.prototype.clientFirst = true;
  
  /**
   * Encode a response using optional trace information.
   *
   * Options:
   *  - `trace`  trace information (optional)
   *
   * @param {Object} cred
   * @api public
   */
  Mechanism.prototype.response = function(cred) {
    return cred.trace || '';
  };
  
  /**
   * Decode a challenge issued by the server.
   *
   * @param {String} chal
   * @api public
   */
  Mechanism.prototype.challenge = function(chal) {
  };

  exports = module.exports = Mechanism;
  
}));