文件签名(java代码).docx

package encryptdecrypt;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.ScrollPaneConstants;public class FileSignature /* * param args */public static void main(String args) / TODO Auto-generated method stubDemoWindow5 dw = new DemoWindow5(文件签名);dw.setBounds(dw.getToolkit().getScreenSize().width / 3, dw.getToolkit().getScreenSize().height / 3,dw.getToolkit().getScreenSize().width / 3, dw.getToolkit().getScreenSize().height / 3);dw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);dw.setVisible(true);class DemoWindow5 extends JFrame implements ActionListener JMenuBar menuBar = new JMenuBar();JMenu fileMenu = new JMenu(文件);JMenuItem openMenuItem = new JMenuItem(打开文件);JMenuItem saveMenuItem = new JMenuItem(保存文件);JMenu signMenu = new JMenu(签名验证);JMenuItem generateItem = new JMenuItem(生成密钥对);JMenuItem signItem = new JMenuItem(签名文件);JMenuItem validateItem = new JMenuItem(验证文件);JTextArea jta = new JTextArea();int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;JScrollPane jsp = new JScrollPane(jta, v, h);public DemoWindow5(String title) super(title);fileMenu.add(openMenuItem);fileMenu.add(saveMenuItem);signMenu.add(generateItem);signMenu.add(signItem);signMenu.add(validateItem);menuBar.add(fileMenu);menuBar.add(signMenu);this.setJMenuBar(menuBar);add(jsp);openMenuItem.addActionListener(this);saveMenuItem.addActionListener(this);generateItem.addActionListener(this);signItem.addActionListener(this);validateItem.addActionListener(this);public void actionPerformed(ActionEvent e) / TODO Auto-generated method stubif (e.getSource() = openMenuItem) openFile(); else if (e.getSource() = saveMenuItem) saveFile(); else if (e.getSource() = generateItem) generateKeys(); else if (e.getSource() = signItem) sign(); else if (e.getSource() = validateItem) validateSign();public void openFile() String fileName = null;/ System.getProperty(user.dir)是获得用户当前的工作目录JFileChooser jfc = new JFileChooser(System.getProperty(user.dir);jfc.setDialogTitle(打开文件);/ 如果选中，获取选择的文件的完整路径if (jfc.showOpenDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();System.out.println(fileName);if (fileName = null)return;try FileInputStream fis = new FileInputStream(fileName);byte text = new bytefis.available();fis.read(text);fis.close();jta.setText(new String(text); catch (Exception e1) e1.printStackTrace();public void saveFile() String fileName = null;JFileChooser jfc = new JFileChooser(System.getProperty(user.dir);jfc.setDialogTitle(保存文件);if (jfc.showSaveDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();if (fileName = null)return;try FileOutputStream fos = new FileOutputStream(fileName, false);fos.write(jta.getText().getBytes();fos.close(); catch (Exception e1) e1.printStackTrace();public void generateKeys() try String fileName = null;JFileChooser jfc = new JFileChooser();jfc.setDialogTitle(生成密钥对);jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);if (jfc.showSaveDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();if (fileName = null)return;File file = new File(fileName);if (!file.exists() file.mkdir();/ 创建DSA密钥对生成器KeyPairGenerator keygen = KeyPairGenerator.getInstance(DSA);/ 采用1024位DSA密钥keygen.initialize(1024);/ 得到密钥对KeyPair keys = keygen.generateKeyPair();PublicKey pubkey = keys.getPublic();PrivateKey prikey = keys.getPrivate();ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(fileName + /公钥.dat);out.writeObject(pubkey);out.close();out = new ObjectOutputStream(new FileOutputStream(fileName+ /私钥.dat);out.writeObject(prikey);out.close(); catch (Exception e1) e1.printStackTrace();public void sign() try String fileName = null;JFileChooser jfc = new JFileChooser();jfc.setDialogTitle(导入私钥文件);if (jfc.showOpenDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();if (fileName = null)return;/ 获取私钥ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fileName);PrivateKey prikey = (PrivateKey) ois.readObject();/ 创建SHAlwithDSA签名类java.security.Signature dsa = java.security.Signature.getInstance(SHA1withDSA, SUN);/ 设置生成摘要的私钥dsa.initSign(prikey);/ 对文本区的文本进行签名验证dsa.update(jta.getText().getBytes(UTF-8);/ 得到签名后的签名摘要值byte signText = dsa.sign();jfc = new JFileChooser();jfc.setDialogTitle(保存签名文件);if (jfc.showSaveDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();if (fileName = null)return;FileOutputStream fos = new FileOutputStream(fileName);fos.write(signText);fos.close(); catch (Exception e1) e1.printStackTrace();public void validateSign() try String fileName = null;JFileChooser jfc = new JFileChooser();jfc.setDialogTitle(导入公钥文件);if (jfc.showOpenDialog(this) = JFileChooser.APPROVE_OPTION) fileName = jfc.getSelectedFile().getPath();if (fileName = null)return;ObjectInputStream in = new ObjectInputStream(new FileInputStream(fileName);PublicKey pubkey = (PublicKey) in.readObject();jfc = new JFileChooser();jfc.setDialogTitle(打开签名文件);if (jf