[GNU Crypto] Problem padding

[sgaston (sent by Nabble.com)]

Hi, (sorry for my english, im from ARgentine :( )

i have a very hard problem...well i think its hard :( 
i dont have a good understanding of cryptography or cipher...i
just wanna do a padding and unpadding text. 
im trying to padding a text just like the padding example say...but when
i try to unpadding the text remains padding...anyone can help me please?
Here is my code and my console output. 
Like you see, my input and output are padded... what am i doing wrong!!??
------------------
<code>
try {
        IPad padding = PadFactory.getInstance("PKCS7");
        Cipher cipher = getCipher();
        int blockSize = cipher.getBlockSize();
        
    padding.init(blockSize);
    byte[] input = "HOLA MMMMMMUNDO".getBytes(); 
    
    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 + " -- " + output);
</code>
<console output>
TEST address@hidden -- address@hidden
</console output>

---

Sent from the Gnu - Crypto - Discuss forum at Nabble.com:
Problem padding