Re: Triple DES Perl to Java

From:

Alex <root@example.com>

Newsgroups:

comp.lang.java.programmer,comp.lang.java.security

Date:

Wed, 23 Aug 2006 17:29:31 +0200

Message-ID:

<44ec746b$0$17995$892e7fe2@authen.yellow.readfreenews.net>

Alex wrote:

Hi,

I am having a base64 encoded data block, which has been triple des
encrypted with Perl's Crypt::TripleDES class
(http://search.cpan.org/dist/Crypt-TripleDES/lib/Crypt/TripleDES.pm) and
am trying to decrypt it with Java.

My problem is now that whatever I already tried I always get some
exception with messages from a wrong padding to nonexistent algorithms.
Below is some sample code with "O2OsvkIsfY0=" as base64 encoded data
block (decoded "data") and "key" as encryption key.

I just noticed that PBE is apparently not the right algorithm and by
using the following code I at least dont get exceptions anymore, but the
output is not the expected one.

   import java.security.*;

   import javax.crypto.*;
   import javax.crypto.spec.*;
   import sun.misc.BASE64Decoder;

   public class Test
   {
       public static void main(String args[]) throws Exception
       {
           String data="O2OsvkIsfY0=";
           String key="key ";

           byte b_data[]=new BASE64Decoder().decodeBuffer(data);

           SecretKeyFactory skf=SecretKeyFactory.getInstance("DESEDE");

           DESedeKeySpec dks=new DESedeKeySpec(key.getBytes());

           SecretKey sk=skf.generateSecret(dks);

           Cipher cipher=Cipher.getInstance("DESEDE/ECB/NOPADDING");
           cipher.init(Cipher.DECRYPT_MODE, sk);
           System.out.println(new String(cipher.doFinal(b_data)));
       }
   }

Does somebody know where I am wrong? Thanks.