Gnu-crypto PKCS7 NegativeArraySizeException

Question

Hi guys, i read a lot of topics in the forum, but i cant find something that
could help me, so i post a topics. I hope somebody help me.
Im trying to do a simple PKCS7 padding using gnu-crypto, but when
a run the padding example that come with the distribution of gnu-cypto
i got a NegativeArraySizeException. Thers's anybody here with the same error?
If you can please help me, i read the gnu-cypto documentation, but i cant
do the code run ok.
When reaches padding.pad the exception is thrown... :(
what am i doing wrong????
<code>
IPad padding = PadFactory.getInstance("PKCS7");
          byte[] input = inputString.getBytes("UTF8");
          byte[] pad = padding.pad(input, 0, input.length);
          byte[] pt = new byte[input.length + pad.length];
          byte[] ct = new byte[pt.length];
          byte[] cpt = new byte[pt.length];
          System.arraycopy(input, 0, pt, 0, input.length);
          System.arraycopy(pad, 0, pt, input.length, pad.length);
          int unpad = padding.unpad(cpt, 0, cpt.length);
          byte[] output = new byte[cpt.length - unpad];
          System.arraycopy(cpt, 0, output, 0, output.length);
          System.out.println("TEST " + input + " -- " + new String(output,"UTF8"));
</code>
<consoleOutput>
java.lang.NegativeArraySizeException
     at gnu.crypto.pad.PKCS7.pad(PKCS7.java:113)
     at org.Test.padding(Test.java:131)
     at org.Test.main(Test.java:48)
</consoleOutput>

Answer 1

You have not published enough code. You have not published the error messages.