myframe.java

计算机安全的实验：加密

			signet = java.security.Signature.getInstance("DSA");
			signet.initSign(rk);// 初始一个Signature对象, 
			signet.update(message.getBytes());
			signed=signet.sign();
			//System.out.println(signed);//
			
			JFileChooser chooser = new JFileChooser();
			chooser.setCurrentDirectory(new File("."));
			chooser.setDialogTitle("save signature");
			int i = chooser.showSaveDialog(this);
			if (i == JFileChooser.APPROVE_OPTION) {
				ObjectOutputStream oos;
				try {
					oos = new ObjectOutputStream(
							new FileOutputStream(chooser.getSelectedFile()));
					oos.writeObject(signed);
					oos.flush();
					oos.close();
				} catch (FileNotFoundException e) {
					JOptionPane.showMessageDialog(this, e.getMessage());
				} catch (IOException e) {
					JOptionPane.showMessageDialog(this, e.getMessage());
				}
				
			}
		} catch (NoSuchAlgorithmException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (InvalidKeyException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (SignatureException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		}
		
	}

	private void getRK() {
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle("get private key");
		int i = chooser.showOpenDialog(this);
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
				rk=(PrivateKey)ois.readObject();
				ois.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (IOException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (ClassNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			}
		}
	}

	private void getPK() {
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle("get public key");
		int i = chooser.showOpenDialog(this);
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
				pk=(PublicKey)ois.readObject();
				ois.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (IOException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (ClassNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			}
		}
	}

	private void getKPair(String alg) {
		try {
			KeyPairGenerator kg = KeyPairGenerator.getInstance(alg);
			System.out.println("Generating key pair ...");
			kg.initialize(512);
			KeyPair keyPair = kg.genKeyPair();// 生成密钥组
			pk = keyPair.getPublic();
			rk = keyPair.getPrivate();
			JFileChooser chooser = new JFileChooser();
			chooser.setCurrentDirectory(new File("."));
			chooser.setDialogTitle("save public key");
			int i = chooser.showSaveDialog(this);
			if (i == JFileChooser.APPROVE_OPTION) {
				ObjectOutputStream oos = new ObjectOutputStream(
						new FileOutputStream(chooser.getSelectedFile()));
				oos.writeObject(pk);
				oos.flush();
				oos.close();
			}
			chooser.setDialogTitle("save private key");
			i = chooser.showSaveDialog(this);
			if (i == JFileChooser.APPROVE_OPTION) {
				ObjectOutputStream oos = new ObjectOutputStream(
						new FileOutputStream(chooser.getSelectedFile()));
				oos.writeObject(rk);
				oos.close();
			}
		} catch (Exception e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		}

	}
	private String openFile(String label) {
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle(label);
		int i = chooser.showOpenDialog(this);
		StringBuffer s = new StringBuffer();
		StringBuffer s1 = new StringBuffer();
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				FileReader reader = new FileReader(file);
				Scanner scan = new Scanner(reader);
				while (scan.hasNextLine()) {
					String str = scan.nextLine();
					s.append(str);
					s1.append(str + "\n");
				}
				scan.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
				return "";
			}
		}
		messageShow = s1.toString();
		return s.toString();
	}
}

class MyDESCipher extends JPanel implements ActionListener {
	JTextArea myInfoArea = new JTextArea();
	JButton getDESKey = new JButton("GetDESK");// 生成密钥并保存到文件
	JButton openMessage = new JButton("OpenMessage");// 导入消息或已加密的信息
	JButton openKey = new JButton("OpenK");// 导入密钥
	JButton encrypt = new JButton("Encrypt");// 对消息进行加密
	JButton decrypt = new JButton("Decrypt");// 对消息进行解密
	SecretKey deskey =null;
	String message=null;
	String messageShow=null;
	public MyDESCipher() {
		this.setLayout(new BorderLayout());
		this.add(new JScrollPane(myInfoArea), BorderLayout.CENTER);
		JPanel buttons = new JPanel(new FlowLayout());
		buttons.add(getDESKey);
		buttons.add(openMessage);
		buttons.add(openKey);
		buttons.add(encrypt);
		buttons.add(decrypt);
		getDESKey.addActionListener(this);
		openMessage.addActionListener(this);
		openKey.addActionListener(this);
		encrypt.addActionListener(this);
		decrypt.addActionListener(this);
		this.add(buttons, BorderLayout.SOUTH);
	}

	public void actionPerformed(ActionEvent e) {
		String command = e.getActionCommand();
		if (command.equals("GetDESK")) {
			getDESK();
		} else if (command.equals("OpenMessage")) {
			message=openFile("open message");
			myInfoArea.append(messageShow);
		} else if (command.equals("OpenK")) {
			openKey();
		} else if (command.equals("Encrypt")) {
			encrypt();
		}
		else if (command.equals("Decrypt")) {
			decrypt();
		}
	}

	private void decrypt() {
		byte[] cipherByte=null;
		byte[] clearByte=null;
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle("get cipher");
		int i = chooser.showOpenDialog(this);
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
				cipherByte=(byte[])ois.readObject();
				ois.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (IOException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (ClassNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			}
		}
		Cipher c1;
		try {
			c1 = Cipher.getInstance("DES");
			c1.init(Cipher.DECRYPT_MODE,deskey);
			clearByte=c1.doFinal(cipherByte);
		} catch (NoSuchAlgorithmException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (NoSuchPaddingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (InvalidKeyException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (IllegalBlockSizeException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (BadPaddingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		}
		try {
			myInfoArea.append(new String(clearByte, "UTF8"));
		} catch (UnsupportedEncodingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		}
	}

	private void encrypt() {
		Cipher c1;
		try {
			c1 = Cipher.getInstance("DES");
			c1.init(Cipher.ENCRYPT_MODE,deskey);
			byte[] cipherByte=c1.doFinal(message.getBytes("UTF8"));
			
			JFileChooser chooser = new JFileChooser();
			chooser.setCurrentDirectory(new File("."));
			chooser.setDialogTitle("save cipher");
			int i = chooser.showSaveDialog(this);
			if (i == JFileChooser.APPROVE_OPTION) {
				ObjectOutputStream oos;
				try {
					oos = new ObjectOutputStream(
							new FileOutputStream(chooser.getSelectedFile()));
					oos.writeObject(cipherByte);
					oos.flush();
					oos.close();
				} catch (FileNotFoundException e) {
					JOptionPane.showMessageDialog(this, e.getMessage());
				} catch (IOException e) {
					JOptionPane.showMessageDialog(this, e.getMessage());
				}
				
			}
		} catch (NoSuchAlgorithmException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (NoSuchPaddingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (InvalidKeyException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (IllegalBlockSizeException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (BadPaddingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		} catch (UnsupportedEncodingException e) {
			JOptionPane.showMessageDialog(this, e.getMessage());
		}
	}

	private void openKey() {
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle("open des key");
		int i = chooser.showOpenDialog(this);
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				ObjectInputStream ois=new ObjectInputStream(new FileInputStream(file));
				deskey=(SecretKey)ois.readObject();
				ois.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (IOException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			} catch (ClassNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
			}
		}
	}

	private String openFile(String label) {
		JFileChooser chooser = new JFileChooser();
		chooser.setCurrentDirectory(new File("."));
		chooser.setDialogTitle(label);
		int i = chooser.showOpenDialog(this);
		StringBuffer s = new StringBuffer();
		StringBuffer s1 = new StringBuffer();
		if (i == JFileChooser.APPROVE_OPTION) {
			File file = chooser.getSelectedFile();
			try {
				FileReader reader = new FileReader(file);
				Scanner scan = new Scanner(reader);
				while (scan.hasNextLine()) {
					String str = scan.nextLine();
					s.append(str);
					s1.append(str + "\n");
				}
				scan.close();
			} catch (FileNotFoundException e) {
				JOptionPane.showMessageDialog(this, e.getMessage());
				return "";
			}
		}
		messageShow = s1.toString();
		return s.toString();
	}

	private void getDESK() {
		KeyGenerator keygen;
		try {
			keygen = KeyGenerator.getInstance("DES");
			deskey = keygen.generateKey();
			JFileChooser chooser = new JFileChooser();
			chooser.setDialogTitle("save des key");