Java EE (Java Enterprise Edition) General Discussion

I have the encryption code, but cant figure the decryption part, anyone have the idea?


**** Encryption Code ****
String plainText = "123456";
MessageDigest mdAlgorithm = MessageDigest.getInstance("MD5");
mdAlgorithm.update(plainText.getBytes());

byte[] digest = mdAlgorithm.digest();
StringBuffer hexString = new StringBuffer();

for (int i = 0; i < digest.length; i++) {
plainText = Integer.toHexString(0xFF & digest);

if (plainText.length() < 2) {
plainText = "0" + plainText;
}

hexString.append(plainText);
}

out.print(hexString.toString());