class SecretKeyUtil {
    public static SecretKey generalKey() {<FILL_FUNCTION_BODY>}

    public static SecretKey generalKeyByDecoders() {
        return Keys.hmacShaKeyFor(Decoders.BASE64.decode("cuAihCz53DZRjZwbsGcZJ2Ai6At+T142uphtJMsk7iQ="));

    }
}

        //自定义
        byte[] encodedKey = Base64.decodeBase64("cuAihCz53DZRjZwbsGcZJ2Ai6At+T142uphtJMsk7iQ=");
        SecretKey key = Keys.hmacShaKeyFor(encodedKey);
        return key;
    
<no_super_class>