javax.crypto.BadPaddingException: data must begin with zero

Here's my problem, I have a java card containing a public and private key. I'm trying to extract the public key from the card, so the first thing I do is to get the module and the exponent of the map and regenerate a public key with her. Then I try to decipher an array of bytes previously encrypted and I get data must begin with error to zero. Here's the part of my code that does this job
cmdApdu = new CommandAPDU(commande2);
          r = channel.transmit(cmdApdu);
          byte[] temp = r.getData();
          byte[] modulus = Arrays.copyOfRange(temp, 3, temp.length);
          byte[] publicExponent = Arrays.copyOfRange(temp, 0, 3);
          
          byte[] modulus2 = new byte[65];
          modulus2[0] = (byte)0x00;
          for(int i = 1 ; i <= modulus.length; i++){
               modulus2[i] = modulus[i-1];
          }
          
          RSAPublicKeySpec spec = new RSAPublicKeySpec(new BigInteger(modulus2), new BigInteger(publicExponent));
          
          KeyFactory kf = KeyFactory.getInstance("RSA");
          
          Key pubKey = kf.generatePublic(spec);
          System.out.println(pubKey.toString());
          
          Cipher cipher = Cipher.getInstance("RSA");
          
          cipher.init(Cipher.DECRYPT_MODE, pubKey);
          
          byte[] encrypted = {(byte)0x8E, (byte)0x44, (byte)0x6E, (byte)0x42, (byte)0xF1, 
                    (byte)0xB7, (byte)0x0B, (byte)0x12, (byte)0x38, (byte)0x75, (byte)0x3A, 
                    (byte)0x50, (byte)0x3E, (byte)0x84, (byte)0x02, (byte)0x88, (byte)0xBC, 
                    (byte)0x0B, (byte)0x7A, (byte)0xFF, (byte)0x2F, (byte)0x39, (byte)0xE8, 
                    (byte)0x64, (byte)0xA4, (byte)0x3E, (byte)0x44, (byte)0x35, (byte)0x16, 
                    (byte)0xB1, (byte)0x16, (byte)0x49, (byte)0xDE, (byte)0xF9, (byte)0x73, 
                    (byte)0xFF, (byte)0x96, (byte)0x07, (byte)0x65, (byte)0xF0, (byte)0x4B, 
                    (byte)0xA8, (byte)0x7C, (byte)0x26, (byte)0xB6, (byte)0xBE, (byte)0xA5, 
                    (byte)0x90, (byte)0xBC, (byte)0xBC, (byte)0xD1, (byte)0x2C, (byte)0xF8, 
                    (byte)0x7B, (byte)0x11, (byte)0x6E, (byte)0x87, (byte)0xD4, (byte)0x97, 
                    (byte)0x04, (byte)0x96, (byte)0xA5, (byte)0x2E, (byte)0x11};
          byte[] decrypted = cipher.doFinal(encrypted);
On my card, it's a RSA_CRT algorithm, does this creat any problem?
I added a 0 x 00 at the beggening of the module because that feels a bit 511 key because it is negative or something, it's ok to do? (It was a previous bug I had and got this solution on the forum BadPaddingException problem )
The key on my card must be a 2048 bit size key but my pubKey.tostring () tells me that.
Public key RSA Sun, 512-bit. What's normal?

Thx for your help cheers!

Published by: FrancisOL on March 19, 2012 10:15

Published by: sabre150 on March 19, 2012 17:20

Moderator action: adding the tags [code] to make the code readable.

Sorry, I can't help. The values you have posted are inconsistent and you haven't posted the public exponent key...

Tags: Java

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