PasswordFieldToMD5.java

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package passwordfieldtomd5;

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

public class PasswordFieldToMD5 {

    public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchProviderException {

byte [] salt = getSalt();
        char[] password ={ 'a', 'b', 'c', 'd', 'e' };
        String passwordMD5WithSalt = digest (password, salt);
        System.out.println("Your plaintext password is : " + new String(password));
        System.out.println("Your password MD5 with salt is : " + passwordMD5WithSalt);
        System.out.println("Nilai salt adalah : " +salt);
        System.out.println("Nilai char password adalah : " +password);

    }
    
    public static String digest (char [] in, byte[] salt) throws NoSuchAlgorithmException {
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        
        ArrayList<Byte> list = new ArrayList<>();
        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);
        messageDigest.update(inputInByte);
        
        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;
    }
}