Return to Question

(See the next iteration.)

(See the next iteration.)

(See the next iteration .)

I have that application for en-/decrypting files. Here, I will post the actual GUI and command line code. In order to run the program refer to this GitHub repository.

package net.coderodde.ciphertool;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import net.coderodde.encryption.CipherTools;
import net.coderodde.file.FileTools;
/**
 * This class implements the command line app for encrypting and decrypting 
 * files with a key.
 * 
 * @author Rodion "rodde" Efremov
 * @version 1.6 (Feb 29, 2016) 
 */
public class App {
 private static final String HELP_MESSAGE = 
 "Usage: java -jar File.jar [-e | -d <key> FILE1 [FILE2 [...]]]\n" +
 "Where -e encrypt the files.\n" +
 " -d decrypt the files.\n" + 
 " <key> the key in decimal; " + 
 "use prefix \"0x\" for hexadecimal.\n" +
 "If you omit all arguments a GUI is started instead.";
 private boolean graphicalInterfaceRequested;
 private boolean printHelpMessage;
 private Mode mode;
 private int key;
 private String[] args;
 public void processArguments(String[] args) {
 this.args = args.clone();
 if (args.length == 0) {
 graphicalInterfaceRequested = true;
 return;
 }
 if (args.length < 3) {
 printHelpMessage = true;
 return;
 }
 switch (args[0]) {
 case "-e":
 mode = Mode.ENCRYPTING;
 break;
 case "-d":
 mode = Mode.DECRYPTING;
 break;
 }
 if (mode == null) {
 printHelpMessage = true;
 return;
 }
 if (args[1].length() >= 2 && 
 (args[1].startsWith("0x") || args[1].startsWith("0X"))) {
 String keyString = args[1].substring(2).trim().toLowerCase();
 try {
 key = Integer.parseInt(keyString, 16);
 } catch (NumberFormatException ex) {
 printHelpMessage = true;
 return;
 }
 } else {
 try {
 key = Integer.parseInt(args[1]);
 } catch (NumberFormatException ex) {
 printHelpMessage = true;
 return;
 }
 }
 }
 public boolean helpMessageRequested() {
 return printHelpMessage;
 }
 public void exec() {
 if (graphicalInterfaceRequested) {
 SwingUtilities.invokeLater(() -> { execAsGUI(); });
 } else {
 execAsCommandLine();
 }
 }
 private void execAsGUI() {
 JFrame frame = new JFrame("File cipher tool");
 JButton buttonEncrypt = new JButton("Encrypt");
 JButton buttonDecrypt = new JButton("Decrypt");
 buttonEncrypt.setPreferredSize(new Dimension(200, 40));
 buttonDecrypt.setPreferredSize(new Dimension(200, 40));
 buttonEncrypt.addActionListener(
 new MyActionListener(frame, Mode.ENCRYPTING));
 buttonDecrypt.addActionListener(
 new MyActionListener(frame, Mode.DECRYPTING));
 frame.getContentPane().setLayout(new BorderLayout());
 frame.getContentPane().add(buttonEncrypt, BorderLayout.NORTH);
 frame.getContentPane().add(buttonDecrypt, BorderLayout.SOUTH);
 frame.pack();
 frame.setResizable(false);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 moveToCenter(frame);
 frame.setVisible(true);
 }
 private static void moveToCenter(JFrame frame) {
 Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
 frame.setLocation((screen.width - frame.getWidth()) >> 1,
 (screen.height - frame.getHeight()) >> 1);
 } 
 private void execAsCommandLine() {
 List<File> fileList = getFileList(args);
 switch (mode) {
 case ENCRYPTING:
 encryptAll(fileList, key);
 break;
 case DECRYPTING:
 decryptAll(fileList, key);
 break;
 }
 }
 static void encryptAll(List<File> fileList, int key) {
 fileList.stream().forEach((File file) -> {
 try {
 byte[] data = FileTools.readFile(file);
 byte[] encryptedData = CipherTools.encrypt(data, key);
 FileTools.writeFile(file, encryptedData);
 } catch (IOException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 }
 });
 }
 static void decryptAll(List<File> fileList, int key) {
 fileList.stream().forEach((File file) -> {
 try {
 byte[] data = FileTools.readFile(file);
 byte[] decryptedData = CipherTools.decrypt(data, key);
 FileTools.writeFile(file, decryptedData);
 } catch (IOException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 }
 });
 }
 private List<File> getFileList(String[] args) {
 // We subtract 2 in order to omit the fist two arguments in 'args' that
 // are the switch and the key.
 List<File> fileList = new ArrayList<>(args.length - 2);
 for (int i = 2; i < args.length; ++i) {
 fileList.add(new File(args[i]));
 }
 return fileList;
 }
 private String getHelpMessage() {
 return HELP_MESSAGE;
 }
 public static void main(String[] args) throws IOException {
 try {
 App app = new App();
 app.processArguments(args);
 if (app.helpMessageRequested()) {
 System.out.println(app.getHelpMessage());
 System.exit(0);
 }
 app.exec();
 } catch (RuntimeException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 System.exit(1);
 }
 }
}

I have that application for en-/decrypting files. Here, I will post the actual GUI and command line code. In order to run the program refer to this GitHub repository.

package net.coderodde.ciphertool;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import net.coderodde.encryption.CipherTools;
import net.coderodde.file.FileTools;
/**
 * This class implements the command line app for encrypting and decrypting 
 * files with a key.
 * 
 * @author Rodion "rodde" Efremov
 * @version 1.6 (Feb 29, 2016) 
 */
public class App {
 private static final String HELP_MESSAGE = 
 "Usage: java -jar File.jar [-e | -d <key> FILE1 [FILE2 [...]]]\n" +
 "Where -e encrypt the files.\n" +
 " -d decrypt the files.\n" + 
 " <key> the key in decimal; " + 
 "use prefix \"0x\" for hexadecimal.\n" +
 "If you omit all arguments a GUI is started instead.";
 private boolean graphicalInterfaceRequested;
 private boolean printHelpMessage;
 private Mode mode;
 private int key;
 private String[] args;
 public void processArguments(String[] args) {
 this.args = args.clone();
 if (args.length == 0) {
 graphicalInterfaceRequested = true;
 return;
 }
 if (args.length < 3) {
 printHelpMessage = true;
 return;
 }
 switch (args[0]) {
 case "-e":
 mode = Mode.ENCRYPTING;
 break;
 case "-d":
 mode = Mode.DECRYPTING;
 break;
 }
 if (mode == null) {
 printHelpMessage = true;
 return;
 }
 if (args[1].length() >= 2 && 
 (args[1].startsWith("0x") || args[1].startsWith("0X"))) {
 String keyString = args[1].substring(2).trim().toLowerCase();
 try {
 key = Integer.parseInt(keyString, 16);
 } catch (NumberFormatException ex) {
 printHelpMessage = true;
 return;
 }
 } else {
 try {
 key = Integer.parseInt(args[1]);
 } catch (NumberFormatException ex) {
 printHelpMessage = true;
 return;
 }
 }
 }
 public boolean helpMessageRequested() {
 return printHelpMessage;
 }
 public void exec() {
 if (graphicalInterfaceRequested) {
 SwingUtilities.invokeLater(() -> { execAsGUI(); });
 } else {
 execAsCommandLine();
 }
 }
 private void execAsGUI() {
 JFrame frame = new JFrame("File cipher tool");
 JButton buttonEncrypt = new JButton("Encrypt");
 JButton buttonDecrypt = new JButton("Decrypt");
 buttonEncrypt.setPreferredSize(new Dimension(200, 40));
 buttonDecrypt.setPreferredSize(new Dimension(200, 40));
 buttonEncrypt.addActionListener(
 new MyActionListener(frame, Mode.ENCRYPTING));
 buttonDecrypt.addActionListener(
 new MyActionListener(frame, Mode.DECRYPTING));
 frame.getContentPane().setLayout(new BorderLayout());
 frame.getContentPane().add(buttonEncrypt, BorderLayout.NORTH);
 frame.getContentPane().add(buttonDecrypt, BorderLayout.SOUTH);
 frame.pack();
 frame.setResizable(false);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 moveToCenter(frame);
 frame.setVisible(true);
 }
 private static void moveToCenter(JFrame frame) {
 Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
 frame.setLocation((screen.width - frame.getWidth()) >> 1,
 (screen.height - frame.getHeight()) >> 1);
 } 
 private void execAsCommandLine() {
 List<File> fileList = getFileList(args);
 switch (mode) {
 case ENCRYPTING:
 encryptAll(fileList, key);
 break;
 case DECRYPTING:
 decryptAll(fileList, key);
 break;
 }
 }
 static void encryptAll(List<File> fileList, int key) {
 fileList.stream().forEach((File file) -> {
 try {
 byte[] data = FileTools.readFile(file);
 byte[] encryptedData = CipherTools.encrypt(data, key);
 FileTools.writeFile(file, encryptedData);
 } catch (IOException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 }
 });
 }
 static void decryptAll(List<File> fileList, int key) {
 fileList.stream().forEach((File file) -> {
 try {
 byte[] data = FileTools.readFile(file);
 byte[] decryptedData = CipherTools.decrypt(data, key);
 FileTools.writeFile(file, decryptedData);
 } catch (IOException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 }
 });
 }
 private List<File> getFileList(String[] args) {
 // We subtract 2 in order to omit the fist two arguments in 'args' that
 // are the switch and the key.
 List<File> fileList = new ArrayList<>(args.length - 2);
 for (int i = 2; i < args.length; ++i) {
 fileList.add(new File(args[i]));
 }
 return fileList;
 }
 private String getHelpMessage() {
 return HELP_MESSAGE;
 }
 public static void main(String[] args) throws IOException {
 try {
 App app = new App();
 app.processArguments(args);
 if (app.helpMessageRequested()) {
 System.out.println(app.getHelpMessage());
 System.exit(0);
 }
 app.exec();
 } catch (RuntimeException ex) {
 System.err.println("ERROR: " + ex.getMessage());
 System.exit(1);
 }
 }
}