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;

}

 

 

 

/// <summary>
/// 当前时间戳
/// </summary>
/// <returns></returns>
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;

}

 

/// <summary>
/// 时间戳转日期
/// </summary>
/// <param name="time"></param>
/// <returns></returns>
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();
}

 

}

 


}

 

 

public class ToutiaoUtil {

    /**
     * 生成 as 和 cp , 用作 API 的请求参数
     * <p>
     * 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"}
     * }
     * </p>
     */
    public static Map<String, String> 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<String, String> 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 "";
    }
}