Question

DES Algorithm Example needed

Asked by: moneymama

Hello All,

I need to encrypt an Object using DES.  Please let me know is this possible if it is possible with java jdk tool kit

thanks
moneymama

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Asked On
2004-08-29 at 16:11:26ID21111657
Tags

algorithm

,

des

,

encryption

Topic

Java Programming Language

Participating Experts
3
Points
250
Comments
6

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Answers

 

by: sudhakar_koundinyaPosted on 2004-08-29 at 16:12:41ID: 11927742

use javax.cryto package

 

by: sudhakar_koundinyaPosted on 2004-08-29 at 16:13:04ID: 11927744

 

by: sudhakar_koundinyaPosted on 2004-08-29 at 16:13:39ID: 11927749

 

by: Giant2Posted on 2004-08-29 at 23:23:01ID: 11928900

To use the crypto package you must have JCE.
This is contained automatically with jdk1.4 (and greater).
This is downloadable from www.java.sun.com for previous jdk (see java Sun and JCE package)

If you want to build your own the implementation of DES algorithm you must study it before all and you can even not use the crypto package of JCE.


Bye, Giant.

 

by: rafiekPosted on 2004-08-30 at 03:09:00ID: 11929625

here's an example, i hope it helps...i had to implement it from scratch for an assigment...but using the javax package is so much more simpler, so use what is available to you.

//EXAMPLE

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.Cipher;

public class SymmetricCipherTest {
  private static byte[] iv =
      { 0x0a, 0x01, 0x02, 0x03, 0x04, 0x0b, 0x0c, 0x0d };

  private static byte[] encrypt(byte[] inpBytes,
      SecretKey key, String xform) throws Exception {
    Cipher cipher = Cipher.getInstance(xform);
    IvParameterSpec ips = new IvParameterSpec(iv);
    cipher.init(Cipher.ENCRYPT_MODE, key, ips);
    return cipher.doFinal(inpBytes);
  }

  private static byte[] decrypt(byte[] inpBytes,
      SecretKey key, String xform) throws Exception {
    Cipher cipher = Cipher.getInstance(xform);
    IvParameterSpec ips = new IvParameterSpec(iv);
    cipher.init(Cipher.DECRYPT_MODE, key, ips);
    return cipher.doFinal(inpBytes);
  }

  public static void main(String[] unused) throws Exception {
    String xform = "DES/ECB/PKCS5Padding";
    // Generate a secret key
    KeyGenerator kg = KeyGenerator.getInstance("DES");
    kg.init(56); // 56 is the keysize. Fixed for DES
    SecretKey key = kg.generateKey();

    byte[] dataBytes =
        "J2EE Security for Servlets, EJBs and Web Services".getBytes();

    byte[] encBytes = encrypt(dataBytes, key, xform);
    byte[] decBytes = decrypt(encBytes, key, xform);

    boolean expected = java.util.Arrays.equals(dataBytes, decBytes);
    System.out.println("Test " + (expected ? "SUCCEEDED!" : "FAILED!"));
  }
}

 

by: moneymamaPosted on 2004-08-30 at 04:40:08ID: 11929984

thanks for ur inputs.

Basically I need to encrypt and decrypt the objects.

thanks

20120131-EE-VQP-002

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