AES

class aes {

 static public $mode = MCRYPT_MODE_NOFB;

 static public functiongenerateKey($length=32) {
 if (!in_array($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)
 returntrigger_error('キーが大きすぎるか、キーが空です。', 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;

 returnbase64_encode($encryptedData);
 }

 static public function decrypt($data, $key) {

 if (strlen($key) > 32 || !$key)
 returntrigger_error( 'キーが大きすぎるか、キーが空です。', 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;
 }}

AES