code: function LocalStore(prefix) {
    prefix = prefix || 'openpgp-';
    this.publicKeysItem = prefix + this.publicKeysItem;
    this.privateKeysItem = prefix + this.privateKeysItem;
    if (typeof window !== 'undefined' && window.localStorage) {
      this.storage = window.localStorage;
    } else {
      this.storage = new (require('node-localstorage').LocalStorage)(config.node_store);
    }
  }
docs: The class that deals with storage of the keyring.
  Currently the only option is to use HTML5 local storage.
  @constructor
  @param {String} prefix prefix for itemnames in localstore