/**
* Default Constructor.
*
* Determines whether or not the mcrypt extension should be used.
*
* $mode could be:
*
* - CRYPT_DES_MODE_ECB
*
* - CRYPT_DES_MODE_CBC
*
* - CRYPT_DES_MODE_CTR
*
* - CRYPT_DES_MODE_CFB
*
* - CRYPT_DES_MODE_OFB
*
* - CRYPT_DES_MODE_3CBC
*
* If not explictly set, CRYPT_DES_MODE_CBC will be used.
*
* @see DES::DES()
* @see Base::Base()
* @param optional Integer $mode
* @access public
*/
function TripleDES($mode = CRYPT_DES_MODE_CBC)
{
switch ($mode) {
// In case of CRYPT_DES_MODE_3CBC, we init as CRYPT_DES_MODE_CBC
// and additional flag us internally as 3CBC
case CRYPT_DES_MODE_3CBC:
parent::DES(CRYPT_DES_MODE_CBC);
$this->mode_3cbc = true;
// This three $des'es will do the 3CBC work (if $key > 64bits)
$this->des = array(new DES(CRYPT_DES_MODE_CBC), new DES(CRYPT_DES_MODE_CBC), new DES(CRYPT_DES_MODE_CBC));
// we're going to be doing the padding, ourselves, so disable it in the DES objects
$this->des[0]->disablePadding();
$this->des[1]->disablePadding();
$this->des[2]->disablePadding();
break;
// If not 3CBC, we init as usual
// If not 3CBC, we init as usual
default:
parent::DES($mode);
}
}
