/**
* Encrypt a block of data using the supplied string key
*
* Note that the supplied data should be the same size as the block size of
* the cipher being used.
*
* @param string $data The data to encrypt
*
* @return string The result encrypted data
*/
protected function encryptBlockData($data)
{
$key = $this->key;
$this->key = substr($key, 0, 8);
$this->initialize();
$data = parent::encryptBlockData($data);
$this->key = substr($key, 8, 8);
$this->initialize();
$data = parent::decryptBlockData($data);
$this->key = substr($key, 16, 8);
$this->initialize();
$data = parent::encryptBlockData($data);
$this->key = $key;
return $data;
}
