phpseclib zero byte padding

Question

How to add zero byte padding in phpseclib with encryption method 3des in EBC mode?

Here my current code:

$cipher = new TripleDES(TripleDES::MODE_ECB);
$cipher->setKey('1234567890ABCDEFGHIJKLMN');

Answer 1

Just figure it out:

1. Disable padding:

   $cipher->disablePadding();
   

2. Manually pad message:

   $message_padded = $urlencoded;
   if (strlen($message_padded) % 8) {
       $message_padded = str_pad($message_padded,
           strlen($message_padded) + 8 - strlen($message_padded) % 8, "\0");
   }
   

3. encrypt:

   $result = $cipher -> encrypt($message_padded);