Re: Encripting with PBE key

rossum <>
Thu, 04 Oct 2007 17:33:42 +0100
On Thu, 04 Oct 2007 07:58:58 -0700,


I'm trying to encript simple text with PBE key which is generated from
the password.
This code is generating the same output for the different passwords.
What's wrong?

Thanks a lot for your help,

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

public class Test05
 public static void main( String args[] ) throws Exception
   byte[] salt = {
           (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
           (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
   int iterationCount = 19;
   String password = "password";
// String password = "different password";

// PBEKeySpec keySpec = new PBEKeySpec( password.toCharArray(), salt,
iterationCount, 8 );
   PBEKeySpec keySpec = new PBEKeySpec( password.toCharArray() );
   System.out.println( "keySpec: " + keySpec.getPassword() );

getPassword() returns an array of char. toString(), which is called
in the background of your println(), will treat this as an array. You
will get "C[XXXXXX", where the X are hex digits making up the hash
code of the array. This is probably not what you were expecting. You
need to explicitly convert the returned char[] to a String for it to
print the actual contents of the array.

   SecretKeyFactory keyFactory =
SecretKeyFactory.getInstance( "PBE" );
   System.out.println( "keyFactory: " + keyFactory.getAlgorithm() );

Different passwords will not change the algorithm, so you will always
get the same output here from getAlgorithm().

   SecretKey key = keyFactory.generateSecret( keySpec );
   System.out.println( "key: " + key.getAlgorithm() );


   Cipher cipher = Cipher.getInstance( key.getAlgorithm() );
   System.out.println( "cipher.getInstance" );

   cipher.init( Cipher.ENCRYPT_MODE, key );
   System.out.println( "cipher.init" );

   String input = "open text to be encrypted";
   System.out.println( cipher.doFinal( input.getBytes() ) );

Again, you will not get the contents of the array, just "B[XXXXXX".



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