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HomeBackend DevelopmentPHP TutorialDetailed explanation of steps to use encryption of php-app development interface

This time I will bring you a detailed explanation of the steps for using the encryption of the php-app development interface. What are the precautions for using the encryption of the php-app development interface? The following is a practical case, let's take a look.

/**
inc 
解析接口
客户端接口传输规则:
1.用cmd参数(base64)来动态调用不同的接口,接口地址统一为 http://a.lovexpp.com
2.将要传过来的参数组成一个数组,数组添加timestamp元素(当前时间戳,精确到秒),将数组的键值按照自然排序从大到小排序
3.将数组组成 key=val&key=val的形式的字符串,将字符串与XPP_KEY连接在一起,用md5加密一次(32位小写),得到sign
4.将sign添加到参数数组中
5.将参数数组转换成json用post请求请求接口地址,key值为param
服务端接口解析规则:
1.接收参数param,将结果解析json得到参数数组
2.取出sign,去掉参数数组中的sign
3.将参数数组key值按照自然排序从大到小排序
4.将排序后的参数数组按照key=val&key=val的形式组成字符串,将字符串与XPP_KEY连接,用md5加密一次(32位小写),得到sign
5.将sign与客户端传过来的sign进行比对,如不一样则可能是中途被篡改参数,服务器拒绝此次请求
6.将sign与session中的sign对比,如果一样,则为重复提交,服务器拒绝此次请求
7.此次的sign存入session
8.执行路由cmd(base64解析后),将参数带到该方法中
*/
 
$xpp_key = "xxx";
 
//接收参数param,将结果解析json得到参数数组
$param = json_decode($_POST['param'] , true);
 
//取出sign,去掉参数数组中的sign
$client_sign = $param['sign'];
unset($param['sign']);
 
//将参数数组key值按照自然排序从大到小排序
krsort($param);
 
//将排序后的参数数组按照key=val&key=val的形式组成字符串,将字符串与XPP_KEY连接,用md5加密一次(32位小写),得到sign
$sb = '';
foreach($param as $key=>$val){
  $sb .= $key . '=' . $val . '&';
}
$sb .= $xpp_key;
$server_sign = md5($sb);
 
//将sign与客户端传过来的sign进行比对,如不一样则可能是中途被篡改参数,服务器拒绝此次请求
if($server_sign !== $client_sign){
  echo json_encode(array('code'=>'invalid request'));
  exit;
}
 
//将sign与session中的sign对比,如果一样,则为重复提交,服务器拒绝此次请求
if($server_sign == $_SESSION['last_sign']){
  echo json_encode(array('code'=>'Repeated requests'));
  exit();
}
 
//此次的sign存入session
$_SESSION['last_sign'] = $server_sign;
 
//执行路由cmd(base64解析后),将参数带到该方法中
$cmd = base64_decode($param['cmd']);
list($controller,$action) = explode('-' , $cmd);
 
// 设置请求参数
unset($param['cmd']);
unset($param['timestamp']);
foreach($param as $key => $val){
  $_REQUEST[$key] = $val;
}

Client code demo:

package com.xpplove.newxpp.activity;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import org.apache.commons.codec.binary.Base64;
import android.os.Bundle;
import com.alibaba.fastjson.JSON;
import com.xpplove.newxpp.BaseActivity;
import com.xpplove.newxpp.bean.Params;
import com.xpplove.newxpp.net.NetPostTask;
import com.xpplove.newxpp.utils.DensityUtil;
public class TestActivity extends BaseActivity {
  private String url = "http://c.lovexpp.com/";
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    loadMesage();
  }
  private void loadMesage() {
    Base64 base64 = new Base64();
    Map<String, String> paramsMap = new HashMap<String, String>();
    paramsMap.put("timestamp", (System.currentTimeMillis() / 1000 + ""));
    String cmd = new String(base64.encode("user-camList".getBytes()));
    String dcmd = new String(base64.decode(cmd.getBytes()));
    paramsMap.put("cmd", cmd);
    paramsMap.put("sign", getString(paramsMap));
    String str = getKeyValues(paramsMap);
    paramsMap = new HashMap<String, String>();
    paramsMap.put("param", str);
    Params params = new Params();
    params.listener = this;
    params.url = url;
    //new NetWorkTask().executeProxy(params);
    new NetPostTask(paramsMap).executeProxy(params);
  }
  @Override
  public void onGetResult(int errorCode, Object result) {
    super.onGetResult(errorCode, result);
    System.out.println();
  }
  private String getString(Map<String, String> paramsMap) {
    TreeMap tm = new TreeMap(paramsMap);
    Iterator i = tm.descendingMap().entrySet().iterator();
    StringBuffer buffer = new StringBuffer();
    while (i.hasNext()) {
      buffer.append(i.next() + "&");
    }
    buffer.append(AppKey);
    return DensityUtil.MD5(buffer.toString());
  }
  // 得到键值对
  private String getKeyValues(Map<String, String> paramsMap) {
    TreeMap tm = new TreeMap(paramsMap);
    Iterator i = tm.descendingKeySet().iterator();
    String jsonText = JSON.toJSONString(tm.descendingMap(), true);
    return jsonText;
  }
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

Detailed explanation of PHP simple selection sorting case

Detailed explanation of the steps of PHP implementation of binary tree depth and breadth first traversal algorithm

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