/** 9022fb1f3cf3e595b6ef6deb22d5528e **/
/**
* Wednesday, 23 April 2014 09:36:25 PM
* Java Encrypt MD5
* Dengan File Format .txt
*
**/
/**
* Studi Kasus:
*
* Terdapat sebuah Universitas yang membuat sistem dengan model enkripsi data nilai Mahasiswa.
* Kemudian nilai asli diberikan kepada Mahasiswa tersebut jika terjadi perubahan
* pada Nilai yang dilakukan oleh Mahasiswa dapat dilakukan pengujian enkripsi dengan
* melakukan perbandingan enkripsi yang sebelumnya sudah disimpan pada database.
*
**/
/**
* Logika:
*
* Pilih File (Format: .txt) -> Ambil Isi File ->
* Pindahkan ke Variabel -> Fungsi MD5 -> Hasil Output
*
**/
/**
* Link:
*
* http://stackoverflow.com/questions/21870607/java-test-for-md5-using-a-file
* http://www.asjava.com/core-java/java-md5-example/
* http://www.asjava.com/core-java/java-md5-example/
*
**/
/**
* Hasil Program:
*
* File: JavaMD5Doc.txt
* MD5: 2211309a572e1764490356784565f4dd
* Isi File: Firmansyah Maulana
*
* File: JavaMD5Doc.txt
* MD5: 9ba13c41ceb4d3f211df4da7f106663b
* Isi File: Firmansyah Maulana 2
*
* File: JavaMD5Doc2.txt
* MD5: 2211309a572e1764490356784565f4dd
* Isi File: Firmansyah Maulana
*
* File: JavaMD5Doc2.txt
* MD5: 9ba13c41ceb4d3f211df4da7f106663b
* Isi File: Firmansyah Maulana 2
*
**/
/** 9022fb1f3cf3e595b6ef6deb22d5528e **/
/**
* Tampilan Program:
*
**/
Gambar 1 Tampilan Awal Aplikasi.
Gambar 2 Ambil File Dari Direktori.
Gambar 3 Tampil Isi File.
Gambar 4 Hasil Encrypt MD5.
/**
* Code Program:
*
**/
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package javamd5example2;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.Reader;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
/**
*
* @author firmansyahMYE
* firmansyahmye@gmail.com
*
*/
public class JavaMD5Example2 {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new JavaMD5Example2();
}
public JavaMD5Example2() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("J2SE Encrypt MD5");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weighty = 1;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.BOTH;
final FilePane sourcePane = new FilePane(true);
final FilePane encryptPane = new FilePane(false);
frame.add(sourcePane, gbc);
gbc.gridx = 2;
frame.add(encryptPane, gbc);
JButton encrypt = new JButton("Encrypt >>");
JPanel panel = new JPanel(new GridBagLayout());
panel.add(encrypt);
encrypt.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
File source = sourcePane.getFile();
try (BufferedReader br = new BufferedReader(new FileReader(source))) {
char[] buffer = new char[1024];
StringBuilder sb = new StringBuilder(1024);
int bytesRead = -1;
while ((bytesRead = br.read(buffer)) != -1) {
sb.append(buffer, 0, bytesRead);
}
String encrypted = encryptionMD5(sb.toString());
File enrypt = new File(source.getPath() + ".enrypted");
try (BufferedWriter bw = new BufferedWriter(new FileWriter(enrypt))) {
bw.write(encrypted);
} catch (Exception exp) {
exp.printStackTrace();
}
encryptPane.setFile(enrypt);
} catch (Exception exp) {
exp.printStackTrace();
}
}
});
gbc.gridx = 1;
gbc.weighty = 1;
gbc.weightx = 0;
gbc.fill = GridBagConstraints.VERTICAL;
frame.add(panel, gbc);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static String encryptionMD5(String token) {
try {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] messageDigest = md.digest(token.getBytes());
BigInteger number = new BigInteger(1, messageDigest);
String hashtext = number.toString(16);
// Now we need to zero pad it if you actually want the full 32 chars.
while (hashtext.length() < 32) {
hashtext = "0" + hashtext;
}
return hashtext;
}
catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
}
public class FilePane extends JPanel {
private JTextField field;
private JButton browse;
private JTextArea content;
private File file;
public FilePane(boolean canOpen) {
setLayout(new BorderLayout());
field = new JTextField();
field.setEditable(false);
content = new JTextArea(20, 20);
content.setEditable(false);
add(new JScrollPane(content));
JPanel header = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
header.add(field, gbc);
gbc.gridx = 1;
gbc.weightx = 0;
gbc.fill = GridBagConstraints.NONE;
if (canOpen) {
browse = new JButton("...");
browse.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File(System.getProperty("user.dir")));
chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
switch (chooser.showOpenDialog(FilePane.this)) {
case JFileChooser.APPROVE_OPTION:
setFile(chooser.getSelectedFile());
break;
}
}
});
header.add(browse, gbc);
}
add(header, BorderLayout.NORTH);
}
public File getFile() {
return file;
}
public void setFile(File f) {
file = f;
field.setText(file.getPath());
if (file != null) {
try (Reader r = new FileReader(file)) {
content.read(r, file);
} catch (Exception exp) {
}
} else {
content.setText(null);
}
content.setCaretPosition(0);
}
}
}
/** 9022fb1f3cf3e595b6ef6deb22d5528e **/
