/*
* Encrypts model class and saves to file
*
* @throws IOException File not writable. Most likely encrypted container file is in use by other process
* @throws CEEncryptionErrorException Error while encrypting. This should not happen unless data corruption while program runs
*/
protected static final synchronized void seal(Model modelIn, File file, SealObject sealerIn)
throws IOException, CEEncryptionErrorException {
try (ObjectOutputStream output =
new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(file)))) {
output.writeObject(sealerIn.encrypt(modelIn));
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(ViewerController.class.getName()).log(Level.SEVERE, null, ex);
throw new CEEncryptionErrorException(
"Seal method of sealer threw IllegalBlockSize. Encryption error");
}
}
/*
* Decrypts model class and restores
*
* @throws FileNotFoundException - File not found or not readable
* @throws CEEncryptionErrorException - Errors while attempting to decrypt file. Usually bad password
*/
protected static final synchronized Model unseal(File file, SealObject sealerIn)
throws FileNotFoundException, CEEncryptionErrorException {
try (ObjectInputStream input =
new ObjectInputStream(new BufferedInputStream(new FileInputStream(file)))) {
return (Model) sealerIn.decrypt((SealedObject) input.readObject());
} catch (ClassNotFoundException | IOException ex) {
JOptionPane.showMessageDialog(
null,
"ERROR: Unable to read previous data. Assuming first time run. All data has been lost. \nPlease create a new admin on the next screen",
"Decryption Failure",
JOptionPane.ERROR_MESSAGE);
throw new FileNotFoundException("Previous data unreadable. Attempting to create new file");
} catch (IllegalBlockSizeException | BadPaddingException ex) {
Logger.getLogger(ViewerController.class.getName()).log(Level.SEVERE, null, ex);
throw new CEEncryptionErrorException(
"IllegalBlockSize or BadPadding thrown by decrypt method of sealer class");
}
}
