一般用于两个系统之间，共同持有相同salt的时候使用。

    /**
     * 加盐签名
     * @uses CommonLogic::ensign(['aaa'=>123,'bbb'=>'efg']);
     * @param array $params 参数
     * @return array 参数多了个signature
     */
    public static function ensign(array $params)
    {
        $salt = config('custom.default.project_salt');
        $authorized = [
            //'basework_appkey' => $appkey,
            'timestamp' => microtime(true),
            'datetime' => date('Y-m-d H:i:s'),
            'formater' => 'json',
            'signtype' => 'md5',
            'version' => '1.0.0',
        ];
        $authorized = ['authorized'=>json_encode($authorized)];
        $params = array_merge($authorized,$params);//halt($params);
        ksort($params);//halt($params);
        $str = '';
        foreach ($params as $k => $v) {
            $str .= $k . $v;
        }//halt($str);
        $signature = md5($salt . $str . $salt);//halt($sign);
        $params['signature'] = strtoupper($signature);
        return $params;
    }


    /**
     * 加盐解签
     * @uses CommonLogic::design($result)
     * @param $params 入参
     * @return bool 布尔值
     */
    public static function design($params): bool
    {
        if (!isset($params['signature'])) {
            return false;
        }//halt($params);
        $signature = $params['signature'];
        unset($params['signature']);//halt($sign);
        $result = self::ensign($params);
        if ($signature === $result['signature']) {
            return true;
        }
        return false;
    }

或者直接使用base64全串加解密：

    /**
     * 加盐签名
     * @param array $params 参数
     * @return array 参数多了个signature
     * @uses CommonLogic::ensign(['aaa'=>123,'bbb'=>'efg']);
     */
    public static function ensign(array $params)
    {
        $salt = config('custom.default.project_salt');//粤盐集团
        $result = ['auth' => [], 'params' => [], 'sign' => ''];//结果

        ksort($params);//halt($params);
        $str = '';
        foreach ($params as $k => $v) {
            $str .= $k . $v;
        }//halt($str);
        $result['params'] = $params;

        $result['auth'] = ['t' => microtime(true), 'v' => '1.0.0'];
        $result['sign'] = md5($salt . $str . json_encode($result['auth']));
        //halt($result);

        return base64_encode(json_encode($result));
    }


    /**
     * 加盐解签
     * @param $params 入参
     * @return bool 布尔值
     * @uses CommonLogic::design($result)
     */
    public static function design($result): array
    {
        $result = json_decode(base64_decode($result), true);//halt($result);
        if (!isset($result['auth']) or !isset($result['auth']['t']) or !isset($result['auth']['v'])) {
            throw new ValidateException('auth construct error');
        }//halt($params);
        if (!isset($result['params'])) {
            throw new ValidateException('params construct error');
        }
        if (!isset($result['sign']) or strlen($result['sign']) != 32) {
            throw new ValidateException('sign construct error');
        }
        $auth = $result['auth'];
        $params = $result['params'];
        $sign = $result['sign'];

        //超过5分钟算失效
        if (!is_numeric($auth['t']) or $auth['t'] < time() - 300) {
            throw new ValidateException('auth t expire');
        }
        $salt = config('custom.default.project_salt');//粤盐集团

        ksort($params);//halt($params);
        $str = '';
        foreach ($params as $k => $v) {
            $str .= $k . $v;
        }//halt($str);
        $signCalc = md5($salt . $str . json_encode($auth));
        if ($signCalc === $sign) {
            return $params;
        }
        return [];
    }