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<?
class AES{
private static $secretKey = '';
private static $vector = '';
/**
*
* @param String $secretKey
* @param String $vector
*/
function __construct($secretKey = '', $vector = '')
{
// secretKey, vector 가 존재하지 않다면 return false;
if(!$secretKey || !$vector) {
return false;
}else{
self::$secretKey = $secretKey;
self::$vector = $vector;
}
}
/**
*
* @param string $string
* @param int $blocksize Blocksize
* @return String
*/
private function addPkcs7Padding($string, $blocksize = 16) {
$len = strlen($string);
$pad = $blocksize - ($len % $blocksize);
$string .= str_repeat(chr($pad), $pad);
return $string;
}
/**
*
* @param String *
* @return String
*/
private function stripPkcs7Padding($string){
$slast = ord(substr($string, -1));
$slastc = chr($slast);
$pcheck = substr($string, -$slast);
if(preg_match("/$slastc{".$slast."}/", $string)){
$string = substr($string, 0, strlen($string)-$slast);
return $string;
} else {
return false;
}
}
private function decodeBytes($hex)
{
$str = '';
for($i=0;$i<strlen($hex);$i+=2){
$tmpValue = (((ord($hex[$i]) - ord('a')) & 0xf ) <<4) + ((ord($hex[$i+1])- ord('a')) & 0xf);
$str .= chr($tmpValue);
}
return $str;
}
private function encodeBytes($string)
{
$str = '';
for($i=0;$i<strlen($string);$i++)
{
$tmpValue = ord($string[$i]);
$ch = ($tmpValue >> 4 & 0xf) + ord('a');
$str .= chr($ch);
$ch = ($tmpValue & 0xf) + ord('a');
$str .= chr($ch);
}
return $str;
}
/**
*
* @param String $encryptedText
* @return String
*/
function decrypt($encryptedText) {
$secretKey = self::$secretKey;
$vector = self::$vector;
$str = $this->decodeBytes($encryptedText);
return $this->stripPkcs7Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $secretKey, $str, MCRYPT_MODE_CBC, $vector));
}
/**
*
* @param String $encryptedText
* @return String
*/
function encrypt($decData) {
$secretKey = self::$secretKey;
$vector = self::$vector;
if(is_array($decData)){
$decData = json_encode($decData);
}
$base = (mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $secretKey,$this->addPkcs7Padding($decData,16) , MCRYPT_MODE_CBC, $vector));
return $this->encodeBytes($base);
}
}
?>