shiro 忘记加密后的密码怎么办?

    public static void main(String[] args) {
        String hashAlgorithmName = "MD5";//加密
        String credentials = "123456";//密码
        int hashIterations = 1024; //加密次数
           
        Object obj = new SimpleHash(hashAlgorithmName, credentials, null, hashIterations);//null 为盐
        System.out.println(obj);
    }