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实验内容和要求
采用Java实现采用对称密码算法的应用软件，所用算法包括DES算法和AES算法。要求该软件具有图形用户界面，能生成密钥，以及对字符串和文件进行加解密
参考代码
// 文件名： test01.java
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.nio.charset.StandardCharsets;
public class test01 extends JFrame implements ActionListener {
private JFileChooser fileChooser = new JFileChooser();
private JTextArea inputArea = new JTextArea(10, 40);
private JTextArea outputArea = new JTextArea(10, 40);
private JButton encryptButton = new JButton("加密");
private JButton decryptButton = new JButton("解密");
private JButton fileButton = new JButton("选择文件");
private JComboBox<String> algorithmBox = new JComboBox<String>(new String[] {"DES", "AES"});
private JLabel keyLabel = new JLabel("密钥:");
private JTextField keyField = new JTextField(20);
public test01() {
super("对称加密算法实现");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
JPanel inputPanel = new JPanel();
inputPanel.add(new JLabel("输入:"));
inputPanel.add(new JScrollPane(inputArea));
JPanel outputPanel = new JPanel();
outputPanel.add(new JLabel("输出:"));
outputPanel.add(new JScrollPane(outputArea));
JPanel buttonPanel = new JPanel();
buttonPanel.add(encryptButton);
buttonPanel.add(decryptButton);
buttonPanel.add(fileButton);
buttonPanel.add(algorithmBox);
buttonPanel.add(keyLabel);
buttonPanel.add(keyField);
mainPanel.add(inputPanel);
mainPanel.add(outputPanel);
mainPanel.add(buttonPanel);
encryptButton.addActionListener(this);
decryptButton.addActionListener(this);
fileButton.addActionListener(this);
setContentPane(mainPanel);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == encryptButton) {
encrypt();
} else if (e.getSource() == decryptButton) {
decrypt();
} else if (e.getSource() == fileButton) {
chooseFile();
}
}
private void chooseFile() {
int returnValue = fileChooser.showOpenDialog(this);
if (returnValue == JFileChooser.APPROVE_OPTION) {
File file = fileChooser.getSelectedFile();
try {
BufferedReader reader = new BufferedReader(new FileReader(file));
inputArea.setText("");
String line = reader.readLine();
while (line != null) {
inputArea.append(line);
line = reader.readLine();
if (line != null) {
inputArea.append("\n");
}
}
reader.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "Error reading file: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
}
private void encrypt() {
try {
String algorithm = (String) algorithmBox.getSelectedItem();
String keyString = keyField.getText();
byte[] keyBytes = keyString.getBytes(StandardCharsets.UTF_8);
SecretKey key;
if (algorithm.equals("DES")) {
key = new SecretKeySpec(keyBytes, "DES");
} else {
key = new SecretKeySpec(keyBytes, "AES");
}
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.ENCRYPT_MODE, key);
String input = inputArea.getText();
byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8);
byte[] outputBytes = cipher.doFinal(inputBytes);
String output = new String(outputBytes, StandardCharsets.UTF_8);
outputArea.setText(output);
} catch (Exception e) {
JOptionPane.showMessageDialog(this, "Error encrypting: "
+ e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
private void decrypt() {
try {
String algorithm = (String) algorithmBox.getSelectedItem();
String keyString = keyField.getText();
byte[] keyBytes = keyString.getBytes();
SecretKey key;
if (algorithm.equals("DES")) {
key = new SecretKeySpec(keyBytes, "DES");
} else {
key = new SecretKeySpec(keyBytes, "AES");
}
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.DECRYPT_MODE, key);
String input = inputArea.getText();
byte[] inputBytes = input.getBytes();
byte[] outputBytes = cipher.doFinal(inputBytes);
String output = new String(outputBytes);
outputArea.setText(output);
} catch (Exception e) {
JOptionPane.showMessageDialog(this, "Error decrypting: " +
e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
public static void main(String[] args) {
new test01();
}
}
实现效果：
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