Contoh Java

public class TripleDESTest {
public static void main(String[] args) {

    String text = "kyle boon";

    byte[] codedtext = new TripleDESTest().encrypt(text);
    String decodedtext  = new TripleDESTest().decrypt(codedtext);

    System.out.println(codedtext);
    System.out.println(decodedtext);
}
public byte[] encrypt(String message)
{
    try
        {
                final MessageDigest md = MessageDigest.getInstance("md5");
        final byte[] digestOfPassword = md.digest("HG58YZ3CR9".getBytes("utf-8"));
        final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        for (int j = 0,  k = 16; j < 8;)
        {
            keyBytes[k++] = keyBytes[j++];
        }

        final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
        final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, key, iv);

        final byte[] plainTextBytes = message.getBytes("utf-8");
        final byte[] cipherText = cipher.doFinal(plainTextBytes);
        final String encodedCipherText = new sun.misc.BASE64Encoder().encode(cipherText);

        return cipherText;    
    }
    catch (java.security.InvalidAlgorithmParameterException e) { System.out.println("Invalid Algorithm"); }
    catch (javax.crypto.NoSuchPaddingException e) { System.out.println("No Such Padding"); }
    catch (java.security.NoSuchAlgorithmException e) { System.out.println("No Such Algorithm"); }
    catch (java.security.InvalidKeyException e) { System.out.println("Invalid Key"); }
    catch (BadPaddingException e) { System.out.println("Invalid Key");}
    catch (IllegalBlockSizeException e) { System.out.println("Invalid Key");}
    catch (UnsupportedEncodingException e) { System.out.println("Invalid Key");}

    return null;
}
public String decrypt(byte[] message)
{
    try
        {
                final MessageDigest md = MessageDigest.getInstance("md5");
        final byte[] digestOfPassword = md.digest("HG58YZ3CR9".getBytes("utf-8"));
        final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
        for (int j = 0,  k = 16; j < 8;)
        {
            keyBytes[k++] = keyBytes[j++];
        }

        final SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        final IvParameterSpec iv = new IvParameterSpec(new byte[8]);
        final Cipher decipher = Cipher.getInstance("DESede/CBC/PKCS5Padding");
        decipher.init(Cipher.DECRYPT_MODE, key, iv);

        //final byte[] encData = new sun.misc.BASE64Decoder().decodeBuffer(message);
        final byte[] plainText = decipher.doFinal(message);

        return plainText.toString();            
    }
    catch (java.security.InvalidAlgorithmParameterException e) { System.out.println("Invalid Algorithm"); }
    catch (javax.crypto.NoSuchPaddingException e) { System.out.println("No Such Padding"); }
    catch (java.security.NoSuchAlgorithmException e) { System.out.println("No Such Algorithm"); }
    catch (java.security.InvalidKeyException e) { System.out.println("Invalid Key"); }
    catch (BadPaddingException e) { System.out.println("Invalid Key");}
    catch (IllegalBlockSizeException e) { System.out.println("Invalid Key");}
    catch (UnsupportedEncodingException e) { System.out.println("Invalid Key");} catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
        }

    return null;
}