/// <summary>
 /// Copies both the public and private keys for the specified user id to the specified file.
 /// </summary>
 /// <param name="fileName">Full path to output file.</param>
 /// <param name="userId">String representing the user id for the key to export.</param>
 /// <param name="asciiArmored">If true, output will be ascii armored; otherwise output will be in binary.</param>
 public void ExportKeyRing(string fileName, string userId, bool asciiArmored)
 {
     _keyStore.ExportKeyRing(fileName, userId, asciiArmored);
 }