/**
* Encrypt the input string.
* @param $n (int) object number
* @param $s (string) data string to encrypt
* @return encrypted string
* @protected
* @author Nicola Asuni
* @since 5.0.005 (2010-05-11)
*/
protected function _encrypt_data($n, $s)
{
if (!$this->encrypted) {
return $s;
}
switch ($this->encryptdata['mode']) {
case 0:
// RC4-40
// RC4-40
case 1:
// RC4-128
$s = TCPDF_STATIC::_RC4($this->_objectkey($n), $s, $this->last_enc_key, $this->last_enc_key_c);
break;
case 2:
// AES-128
$s = TCPDF_STATIC::_AES($this->_objectkey($n), $s);
break;
case 3:
// AES-256
$s = TCPDF_STATIC::_AES($this->encryptdata['key'], $s);
break;
}
return $s;
}
