Mega Code Archive
Message Digest Test
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import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
public class MessageDigestTest {
public static void main(String[] args) {
JFrame f = new MessageDigestFrame();
f.show();
}
}
class MessageDigestFrame extends JFrame {
public MessageDigestFrame() {
setTitle("MessageDigestTest");
setSize(400, 200);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JPanel panel = new JPanel();
ButtonGroup group = new ButtonGroup();
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
JCheckBox b = (JCheckBox) event.getSource();
setAlgorithm(b.getText());
}
};
addCheckBox(panel, "SHA-1", group, true, listener);
addCheckBox(panel, "MD5", group, false, listener);
Container contentPane = getContentPane();
contentPane.add(panel, "North");
contentPane.add(new JScrollPane(message), "Center");
contentPane.add(digest, "South");
digest.setFont(new Font("Monospaced", Font.PLAIN, 12));
setAlgorithm("SHA-1");
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("File");
JMenuItem fileDigestItem = new JMenuItem("File digest");
fileDigestItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
loadFile();
}
});
menu.add(fileDigestItem);
JMenuItem textDigestItem = new JMenuItem("Text area digest");
textDigestItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
String m = message.getText();
computeDigest(m.getBytes());
}
});
menu.add(textDigestItem);
menuBar.add(menu);
setJMenuBar(menuBar);
}
public void addCheckBox(Container c, String name, ButtonGroup g,
boolean selected, ActionListener listener) {
JCheckBox b = new JCheckBox(name, selected);
c.add(b);
g.add(b);
b.addActionListener(listener);
}
public void setAlgorithm(String alg) {
try {
currentAlgorithm = MessageDigest.getInstance(alg);
digest.setText("");
} catch (NoSuchAlgorithmException e) {
digest.setText("" + e);
}
}
public void loadFile() {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
int r = chooser.showOpenDialog(this);
if (r == JFileChooser.APPROVE_OPTION) {
String name = chooser.getSelectedFile().getAbsolutePath();
computeDigest(loadBytes(name));
}
}
public byte[] loadBytes(String name) {
FileInputStream in = null;
try {
in = new FileInputStream(name);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int ch;
while ((ch = in.read()) != -1)
buffer.write(ch);
return buffer.toByteArray();
} catch (IOException e) {
if (in != null) {
try {
in.close();
} catch (IOException e2) {
}
}
return null;
}
}
public void computeDigest(byte[] b) {
currentAlgorithm.reset();
currentAlgorithm.update(b);
byte[] hash = currentAlgorithm.digest();
String d = "";
for (int i = 0; i < hash.length; i++) {
int v = hash[i] & 0xFF;
if (v < 16)
d += "0";
d += Integer.toString(v, 16).toUpperCase() + " ";
}
digest.setText(d);
}
private JTextArea message = new JTextArea();
private JTextField digest = new JTextField();
private MessageDigest currentAlgorithm;
}
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