php openssl_の使用encryptにおけるAES-128-ECB暗号解読

$key = ‘Hl2018@1212’;  //    

/**
 * @param string $string         
 * @param string $key   
 * @return string
 */
function encrypt($string, $key)
{

    // openssl_encrypt     Mcrypt，       ，  16      
    $data = openssl_encrypt($string, 'AES-128-ECB', $key, OPENSSL_RAW_DATA);

    $data = strtolower(bin2hex($data));

    return $data;
}

/**
 * @param string $string         
 * @param string $key   
 * @return string
 */
function decrypt($string, $key)
{
    $decrypted = openssl_decrypt(hex2bin($string), 'AES-128-ECB', $key, OPENSSL_RAW_DATA);

    return $decrypted;

}