/**
* Default Constructor.
*
* Determines whether or not the mcrypt extension should be used.
*
* $mode could be:
*
* - CRYPT_AES_MODE_ECB
*
* - CRYPT_AES_MODE_CBC
*
* - CRYPT_AES_MODE_CTR
*
* - CRYPT_AES_MODE_CFB
*
* - CRYPT_AES_MODE_OFB
*
* If not explictly set, CRYPT_AES_MODE_CBC will be used.
*
* @see Crypt_Rijndael::Crypt_Rijndael()
* @see Crypt_Base::Crypt_Base()
* @param optional Integer $mode
* @access public
*/
function __construct($mode = CRYPT_AES_MODE_CBC)
{
parent::__construct($mode);
}
/**
* Default Constructor.
*
* Determines whether or not the mcrypt extension should be used. $mode should only, at present, be
* CRYPT_AES_MODE_ECB or CRYPT_AES_MODE_CBC. If not explictly set, CRYPT_AES_MODE_CBC will be used.
*
* @param
* optional Integer $mode
* @return Crypt_AES
* @access public
*/
function __construct($mode = CRYPT_AES_MODE_CBC)
{
if (!defined('CRYPT_AES_MODE')) {
switch (true) {
case extension_loaded('mcrypt'):
// i'd check to see if aes was supported, by doing in_array('des', mcrypt_list_algorithms('')),
// but since that can be changed after the object has been created, there doesn't seem to be
// a lot of point...
define('CRYPT_AES_MODE', CRYPT_AES_MODE_MCRYPT);
break;
default:
define('CRYPT_AES_MODE', CRYPT_AES_MODE_INTERNAL);
}
}
switch (CRYPT_AES_MODE) {
case CRYPT_AES_MODE_MCRYPT:
switch ($mode) {
case CRYPT_AES_MODE_ECB:
$this->paddable = true;
$this->mode = MCRYPT_MODE_ECB;
break;
case CRYPT_AES_MODE_CTR:
// ctr doesn't have a constant associated with it even though it appears to be fairly widely
// supported. in lieu of knowing just how widely supported it is, i've, for now, opted not to
// include a compatibility layer. the layer has been implemented but, for now, is commented out.
$this->mode = 'ctr';
// $this->mode = in_array('ctr', mcrypt_list_modes()) ? 'ctr' : CRYPT_AES_MODE_CTR;
break;
case CRYPT_AES_MODE_CFB:
$this->mode = 'ncfb';
break;
case CRYPT_AES_MODE_OFB:
$this->mode = MCRYPT_MODE_NOFB;
break;
case CRYPT_AES_MODE_CBC:
default:
$this->paddable = true;
$this->mode = MCRYPT_MODE_CBC;
}
$this->debuffer = $this->enbuffer = '';
break;
default:
switch ($mode) {
case CRYPT_AES_MODE_ECB:
$this->paddable = true;
$this->mode = CRYPT_RIJNDAEL_MODE_ECB;
break;
case CRYPT_AES_MODE_CTR:
$this->mode = CRYPT_RIJNDAEL_MODE_CTR;
break;
case CRYPT_AES_MODE_CFB:
$this->mode = CRYPT_RIJNDAEL_MODE_CFB;
break;
case CRYPT_AES_MODE_OFB:
$this->mode = CRYPT_RIJNDAEL_MODE_OFB;
break;
case CRYPT_AES_MODE_CBC:
default:
$this->paddable = true;
$this->mode = CRYPT_RIJNDAEL_MODE_CBC;
}
}
if (CRYPT_AES_MODE == CRYPT_AES_MODE_INTERNAL) {
parent::__construct($this->mode);
}
}