Accessing Server APIs

import (
   "crypto/md5"
   "crypto/rand"
   "encoding/hex"
   "fmt"
   "log"
   "time"
)
// Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
func GenerateSignature(appId uint32, signatureNonce string, serverSecret string, timestamp int64) (Signature string){
   data := fmt.Sprintf("%d%s%s%d", appId, signatureNonce, serverSecret, timestamp)
   h := md5.New()
   h.Write([]byte(data))
   return hex.EncodeToString(h.Sum(nil))
}
func main() {
   /*Generate hexadecimal random string (16 bits)*/
   nonceByte := make([]byte, 8)
   rand.Read(nonceByte)
   signatureNonce := hex.EncodeToString(nonceByte)
   log.Printf(signatureNonce)
   appId := 12345       // use your appId and serverSecret
   serverSecret := "9193cc662a4c0ec135ec71fb57194b38"
   timestamp := time.Now().Unix()
   /* appId:12345
      signatureNonce:4fd24687296dd9f3
      serverSecret:9193cc662a4c0ec135ec71fb57194b38
      timestamp:1615186943      2021/03/08 15:02:23
      signature:43e5cfcca828314675f91b001390566a
    */
   log.Printf("signature:%v", GenerateSignature(uint32(appId), signatureNonce, serverSecret, timestamp))
}

# -*- coding: UTF-8 -*-
import secrets
import string
import hashlib
import time
#Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
def GenerateSignature(appId, signatureNonce, serverSecret, timestamp):
    str1 = str(appId) + signatureNonce + serverSecret + str(timestamp)
    hash = hashlib.md5()
    hash.update(str1.encode("utf8"))
    signature = hash.hexdigest()
    return signature

def main():
    #Generate hexadecimal random string (16 bits)
    signatureNonce = secrets.token_hex(8)

    #Use your appId and serverSecret
    appId = 12345
    serverSecret = "9193cc662a4c0ec135ec71fb57194b38"
    #Get 10 digit unix timestamp
    timestamp = int(time.time())
    print(GenerateSignature(appId,signatureNonce,serverSecret,timestamp))

if __name__ == '__main__':
    main()

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
public class md5{
    /**
     * byte array to hexadecimal
     * @param bytes The byte array that needs to be converted
     * @return  Converted Hex string
     */
    public static String bytesToHex(byte[] bytes) {
        StringBuffer md5str = new StringBuffer();
        //Replace each byte of the array into hexadecimal and connect it to an md5 string
        int digital;
        for (int i = 0; i < bytes.length; i++) {
            digital = bytes[i];
            if (digital < 0) {
                digital += 256;
            }
            if (digital < 16) {
                md5str.append("0");
            }
            md5str.append(Integer.toHexString(digital));
        }
        return md5str.toString();
    }
    // Signature=md5(AppId + SignatureNonce + ServerSecret + Timestamp)
    public static String GenerateSignature(long appId, String signatureNonce, String serverSecret, long timestamp){
        String str = String.valueOf(appId) + signatureNonce + serverSecret + String.valueOf(timestamp);
        String signature = "";
        try{
            //Create an object that provides the information digest algorithm, initialized to the md5 algorithm object
            MessageDigest md = MessageDigest.getInstance("MD5");
            // get byte array after calculation
            byte[] bytes = md.digest(str.getBytes("utf-8"));
            //Replace each byte of the array into hexadecimal and connect it to an md5 string
            signature = bytesToHex(bytes);
        }catch (Exception e) {
            e.printStackTrace();
        }
        return signature;
    }


    public static void main(String[] args){
        //Generate hexadecimal random string (16 bits)
        byte[] bytes = new byte[8];
        SecureRandom sr = null;
        //Use SecureRandom to obtain a high-strength secure random number generator
        try{
            sr = SecureRandom.getInstanceStrong();
        }catch(Exception e){
            e.printStackTrace();
        }
        sr.nextBytes(bytes);
        String signatureNonce = bytesToHex(bytes);
        long appId = 12345L;       //Use your appId and serverSecret, add uppercase L or lowercase l after the number to indicate long type
        String serverSecret = "9193cc662a4c0ec135ec71fb57194b38";
        long timestamp = System.currentTimeMillis() / 1000L;
        System.out.println(GenerateSignature(appId,signatureNonce,serverSecret,timestamp));
    }
}

<?php
function GenerateSignature($appId, $signatureNonce, $serverSecret, $timestamp)
{
    $str = $appId.$signatureNonce.$serverSecret.$timestamp;
    $signature = md5($str);
    return $signature;
}

//Generate hexadecimal random string (16 bits)
$signatureNonce = bin2hex(random_bytes(8));
// use your appId and serverSecret
$appId = 12345;
$serverSecret = "9193cc662a4c0ec135ec71fb57194b38";
$timestamp = time();
$signature = GenerateSignature($appId, $signatureNonce, $serverSecret, $timestamp);
echo $signature;
?>