C# 今日头条as,cp 算法

网上找了下全是PHP或者JS 的，自己写了个C#的：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace WpfApplication1
{
public class ToutiaoASCP
{

/*
* auther : wgscd
* date: 2018-4-28
*/
//https://www.toutiao.com/c/user/article/?page_type=1&user_id=58865304456&max_behot_time=1520622925&count=20&as=A1554AEA1B13257&cp=5AABC3D275071E1&_signature=wQ7S9xAbm68jAWE21IUZHsEO0u
/*
js CODE:
function getAsCp()
{
$as = ''; $cp = '';

$time = time();
$key = strtoupper(dechex($time));
$md5Key = strtoupper(md5($time));

if (8 !== strlen($key)) {
$as = '479BB4B7254C150';
$cp = '7E0AC8874BB0985';
} else {
$md5KeyAsc5 = substr($md5Key, 0, 5);
$md5KeyDesc5 = substr($md5Key, -5);
$as = ''; $cp = '';
for ($i = 0; $i < 5; $i ++) {
$as .= $md5KeyAsc5[$i] . $key[$i];
$cp .= $key[$i + 3] . $md5KeyDesc5[$i];
}
$as = 'A1' . $as . substr($key, -3);
$cp = substr($key, 0, 3) . $cp . 'E1';
}

return array($as, $cp);

*/

 

 

public static string generateASCP()
{

string AS = "";
string CP = "";
string md5KeyAsc5 = "";
string md5KeyDesc5 = "";
long time = Timestamp();
string key = time.ToString("X2").ToUpper();
string md5Key = EncryptWithMD5("" + time).ToUpper();
if (8 != key.Length)
{
AS = "479BB4B7254C150";
CP = "7E0AC8874BB0985";
}
else
{
md5KeyAsc5 = md5Key.Substring(0, 5);
md5KeyDesc5 = md5Key.Substring(md5Key.Length - 5);
AS = "";
CP = "";
for (int i = 0; i < 5; i++)
{

        AS += md5KeyAsc5[i].ToString() + key[i].ToString();
        CP += key[i + 3].ToString() + md5KeyDesc5[i].ToString();

}
AS = "" + "A1" + AS + key.Substring(key.Length - 3);
CP = key.Substring(0, 3) + CP + "E1";


}

return "as=" + AS + "&cp=" + CP;

}

 

 

 

/// 

/// 当前时间戳
/// 
/// 
static long Timestamp()
{

System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
long timeStamp = (long)(DateTime.Now - startTime).TotalSeconds; // 相差秒数
System.Console.WriteLine(timeStamp);
return timeStamp;

}

 

/// 

/// 时间戳转日期
/// 
/// 
/// 
static DateTime TimestampToDatetime(long time)
{

long unixTimeStamp = 1478162177;
System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
DateTime dt = startTime.AddSeconds (unixTimeStamp);
System.Console.WriteLine(dt.ToString("yyyy/MM/dd HH:mm:ss:ffff"));
return dt;

}

 

static string EncryptWithMD5(string source)
{
byte[] sor = Encoding.UTF8.GetBytes(source);
MD5 md5 = MD5.Create();
byte[] result = md5.ComputeHash(sor);
StringBuilder strbul = new StringBuilder(40);
for (int i = 0; i < result.Length; i++)
{
strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位

}
return strbul.ToString();
}

 

}

 


}

 

 

　　

 

 

转载个JAVA的：

 

public class ToutiaoUtil {

    /**
     * 生成 as 和 cp , 用作 API 的请求参数
     * 

     * function () {
     * var t = Math.floor((new Date).getTime() / 1e3), i = t.toString(16).toUpperCase(), e = md5(t).toString().toUpperCase();
     * if (8 != i.length)return {as: "479BB4B7254C150", cp: "7E0AC8874BB0985"};
     * for (var s = e.slice(0, 5), o = e.slice(-5), n = "", a = 0; 5 > a; a++)n += s[a] + i[a];
     * for (var l = "", r = 0; 5 > r; r++)l += i[r + 3] + o[r];
     * return {as: "A1" + n + i.slice(-3), cp: i.slice(0, 3) + l + "E1"}
     * }
     * 
     */
    public static Map getAsCp() {
        int t = (int) (System.currentTimeMillis() / 1000);
        String i = Integer.toHexString(t).toUpperCase();
        String e = getMD5(t + "").toUpperCase();

        String s = e.substring(0, 5);
        String o = e.substring(e.length() - 5, e.length());
        String n = "";
        for (int j = 0; 5 > j; j++) {
            n += s.substring(j, j + 1) + i.substring(j, j + 1);
        }

        String l = "";
        for (int r = 0; 5 > r; r++) {
            l += i.substring(r + 3, r + 3 + 1) + o.substring(r, r + 1);
        }

        String as = "A1" + n + i.substring(i.length() - 3, i.length());
        String cp = i.substring(0, 3) + l + "E1";

        Map map = new HashMap<>();
        map.put(Constant.AS, as);
        map.put(Constant.CP, cp);
        return map;
    }

    /**
     * 对字符串 MD5 加密
     */
    public static String getMD5(String str) {
        try {
            // 生成一个 MD5 加密计算摘要
            MessageDigest md = MessageDigest.getInstance("MD5");
            // 计算 MD5 函数
            md.update(str.getBytes());
            // digest() 最后确定返回 MD5 hash 值, 返回值为8为字符串
            // 因为 MD5 hash 值是16位的hex值, 实际上就是8位的字符
            // BigInteger 函数则将8位的字符串转换成 16 位 hex 值, 用字符串来表示得到字符串形式的 hash 值
            return new BigInteger(1, md.digest()).toString(16);
        } catch (Exception e) {
            ErrorAction.print(e);
        }
        return "";
    }
}

　　

 

 

 

java refer:

package com.meiji.toutiao.api;
	import com.meiji.toutiao.bean.media.MediaProfileBean;
	import com.meiji.toutiao.bean.media.MediaWendaBean;
	import com.meiji.toutiao.bean.media.MultiMediaArticleBean;
	import io.reactivex.Observable;
	import okhttp3.ResponseBody;
	import retrofit2.Call;
	import retrofit2.http.GET;
	import retrofit2.http.Query;
	/**
	* Created by Meiji on 2017/5/20.
	*/
	public interface IMobileMediaApi {
	/**
	* 头条号主页信息
	* https://is.snssdk.com/user/profile/homepage/v3/json/?media_id=4377795668&to_html=0&source=article_top_author&refer=all
	*
	* @param mediaId 头条号ID
	*/
	@GET("https://is.snssdk.com/user/profile/homepage/v3/json/?to_html=0&source=article_top_author&refer=all&aid=13")
	Observable<MediaProfileBean> getMediaProfile(
	@Query("media_id") String mediaId);
	/**
	* 获取头条号文章
	* https://is.snssdk.com/pgc/ma/?page_type=1&max_behot_time=1495181160&media_id=52445544609&output=json&is_json=1&count=10&from=user_profile_app&version=2&as=479BB4B7254C150&cp=585DB1871ED64E1
	*
	* @param mediaId 头条号ID
	* @param maxBehotTime 时间轴
	*/
	@GET("https://is.snssdk.com/pgc/ma/?page_type=1&output=json&is_json=1&count=20&from=user_profile_app&version=2")
	Observable<MultiMediaArticleBean> getMediaArticle(
	@Query("media_id") String mediaId,
	@Query("max_behot_time") String maxBehotTime,
	@Query("as") String as,
	@Query("cp") String cp);
	/**
	* 获取头条号视频
	* https://is.snssdk.com/pgc/ma/?page_type=0&max_behot_time=1495181160&media_id=52445544609&output=json&is_json=1&count=10&from=user_profile_app&version=2&as=479BB4B7254C150&cp=585DB1871ED64E1
	*
	* @param mediaId 头条号ID
	* @param maxBehotTime 时间轴
	*/
	@GET("https://is.snssdk.com/pgc/ma/?page_type=0&output=json&is_json=1&count=10&from=user_profile_app&version=2")
	Observable<MultiMediaArticleBean> getMediaVideo(
	@Query("media_id") String mediaId,
	@Query("max_behot_time") String maxBehotTime,
	@Query("as") String as,
	@Query("cp") String cp);
	/**
	* 获取头条号问答
	* https://is.snssdk.com/wenda/profile/wendatab/brow/?other_id=6619635172&format=json&from_channel=media_channel
	*
	* @param mediaId 头条号ID
	*/
	@GET("https://is.snssdk.com/wenda/profile/wendatab/brow/?format=json&from_channel=media_channel")
	Observable<MediaWendaBean> getMediaWenda(
	@Query("other_id") String mediaId);
	/**
	* 获取头条号问答(加载更多)
	* http://is.snssdk.com/wenda/profile/wendatab/loadmore/?other_id=53294853357&format=json&from_channel=media_channel&cursor=6428177292098273538&count=10&offset=undefined
	*
	* @param mediaId 头条号ID
	* @param cursor 偏移量
	*/
	@GET("http://is.snssdk.com/wenda/profile/wendatab/loadmore/?format=json&from_channel=media_channel&count=10&offset=undefined")
	Observable<MediaWendaBean> getMediaWendaLoadMore(
	@Query("other_id") String mediaId,
	@Query("cursor") String cursor);
	/**
	* 获取头条号动态
	* https://is.snssdk.com/dongtai/list/v11/?user_id=6619635172&max_cursor=1494916016999
	*
	* @param mediaId 头条号ID
	* @param maxCursor 偏移量
	*/
	@GET("https://is.snssdk.com/dongtai/list/v11/?")
	Call<ResponseBody> getMediaDongtai(
	@Query("user_id") String mediaId,
	@Query("max_cursor") int maxCursor);
	}

转载于:https://www.cnblogs.com/wgscd/articles/8968323.html