PHP AES 加密解密

class Security{
public static $_key = '1234567890123456';
public static $_skey = '1234567890exampl';

public static function encrypt($input) {
$key = hex2bin(self::$_skey);
$input = hex2bin($input);
$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
//$input = Security::pkcs5_pad($input, $size);
$td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$data = base64_encode($data);
return $data;
}
private static function pkcs5_pad($text, $blocksize) {
$pad = $blocksize - (strlen($text) % $blocksize);
return $text . str_repeat('0d', $pad);
}
public static function decrypt($sStr) {
//echo "until_data:--";
$sStr = hex2bin($sStr);
//var_dump($sStr);
$sKey = hex2bin(self::$_skey);
$decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $sKey, base64_decode($sStr), MCRYPT_MODE_ECB);
$decrypted_hex = bin2hex($decrypted);
$complement = substr($decrypted_hex, strlen($decrypted_hex) - 2, 2);
return str_replace($complement, '', $decrypted_hex);
}
}