- class aes {
-
- static public $mode = MCRYPT_MODE_NOFB;
-
- static public function generateKey($length=32) {
- if (!in_array($length,array(16,24,32)))
- return False;
-
- $str = '';
- for ($i=0;$i<$length;$i++) {
- $str .= chr(rand(33,126));
- }
-
- return $str;
- }
-
- static public function encrypt($data, $key) {
-
- if (strlen($key) > 32 || !$key)
- return trigger_error('key too large or key is empty.', E_USER_WARNING) && False;
-
- $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode);
- $iv = mcrypt_create_iv($ivSize, (substr(PHP_OS,0,1) == 'W' ? MCRYPT_RAND : MCRYPT_DEV_URANDOM ));
- $encryptedData = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv);
- $encryptedData = $iv . $encryptedData;
-
- return base64_encode($encryptedData);
- }
-
- static public function decrypt($data, $key) {
-
- if (strlen($key) > 32 || !$key)
- return trigger_error('key too large or key is empty.', E_USER_WARNING) && False;
-
- $data = base64_decode($data);
- if (!$data)
- return False;
-
- $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode);
- $iv = substr($data, 0, $ivSize);
-
- $data = substr($data, $ivSize);
-
- $decryptData = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv);
-
- return $decryptData;
- }}
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