Java Tutorial/Security/DESede

Sealed Objects

   <source lang="java">

import java.security.Key; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SealedObject; public class MainClass {

 public static void main(String[] args) throws Exception {
   String creditCard = "1234567890";
   KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
   Key key = keyGenerator.generateKey();
   Cipher cipher = Cipher.getInstance("DESede");
   cipher.init(Cipher.ENCRYPT_MODE, key);
   SealedObject so = new SealedObject(creditCard, cipher);
   String unencryptedCreditCard = (String) so.getObject(key);
   System.out.println(unencryptedCreditCard);
 }

}</source>

using the name DESede rather than TripleDES

   <source lang="java">

import java.security.Key; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; public class MainClass {

 public static void main(String[] args) throws Exception {
   KeyGenerator keyGenerator = KeyGenerator.getInstance("DESede");
   keyGenerator.init(168);
   Key key = keyGenerator.generateKey();
   Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
   cipher.init(Cipher.ENCRYPT_MODE, key);
   byte[] ciphertext = cipher.doFinal("text".getBytes("UTF8"));
   for (int i = 0; i < ciphertext.length; i++) {
     System.out.print(ciphertext[i] + " ");
   }
   cipher.init(Cipher.DECRYPT_MODE, key);
   byte[] decryptedText = cipher.doFinal(ciphertext);
   System.out.println(new String(decryptedText, "UTF8"));
 }

} //-71 -27 -10 -67 -24 -37 -79 70 text</source>