Hasil modifikasi JPasswordField ke MD5.. Menjadi JPasswordField ke MD5 + Salt.

JPasswordMD5Example2.java

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package passwordmd5withsalt;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.util.ArrayList;

/**
 *
 * @author indrasudirman
 */
public class JPasswordMD5Example2 {
    
    public static String digest (char [] in, byte[] salt) throws NoSuchAlgorithmException {
        
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        
        ArrayList<Byte> list = new ArrayList<Byte>();
        for (int i = 0; i < in.length; i++) {
            byte b = (byte) in[i];
            list.add(b);
        }
        
        byte [] inputInByte = new byte [list.size()];
        for (int i = 0; i < list.size(); i++) {
            inputInByte[i] = list.get(i);
        }
        
        messageDigest.update(salt);
        
        byte byteData [] = messageDigest.digest();
        
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < byteData.length; i++) {
            String hex = Integer.toHexString(0xff & byteData[i]);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            
            hexString.append(hex);
        }
        
        return hexString.toString();
    }
    
    public static byte[] getSalt() throws NoSuchAlgorithmException, NoSuchProviderException {
        //Always use a SecureRandom generator
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG", "SUN");
        //Create array for salt
        byte [] salt = new byte[16];
        //Get a random salt
        secureRandom.nextBytes(salt);
        //return salt
        return salt;
        
    }
    
    public static void main (String [] args) throws NoSuchAlgorithmException, NoSuchProviderException {
      
        char[] pass = {'h', 'e', 'l', 'l', 'o', 'w', 'o', 'r', 'l', 'd'};
        byte[] salt = getSalt();
        String str2 = digest(pass, salt);
        System.out.println(str2);
    
    }
    
}

Line 20 : Penambahan 1 parameter byte [] salt
Line 35: Menjadi = messageDigest.update(salt); Sebelumnya = messageDigest.update(inputInByte); inputInByte-nya jadi tidak terpakai om. Ini yang saya bingung. Apa, tetap berhasil MD5 + Salt-nya.
Line 52 - 62: Penambahan method getSalt(); sebelumnya di MD5 tidak ada.

Implementasinya:

Line 67: variabel salt byte[] = getSalt();
Line 68: menambah String str2 = digest(pass, salt); sebelumnya: String str2 = digest(pass); tidak pakai salt.