text: var rsaKeyMap = {};
  
  var addKey = function (key) {
      rsaKeyMap[key.publicKey] = key.privateKey;
  };
  
  var deleteKey = function (publicKey) {
      delete rsaKeyMap[publicKey];
  };
  
  var getPrivateKey = function (publicKey) {
      return rsaKeyMap[publicKey];
  };
  
  var show = function () {
      console.log(JSON.stringify(rsaKeyMap));
  };
  
  exports.addKey = addKey;
  exports.deleteKey = deleteKey;
  exports.getPrivateKey = getPrivateKey;
  exports.show = show;
  