Secure authentication with userSig

Overview
This document outlines two authentication methods for Tencent-RTC services, with a focus on UserSig, a security signature by Tencent Cloud to safeguard against unauthorized access. For basic cloud service usage, provide SDKAppID, UserID, and UserSig during SDK initialization or login.
SDKAppID is used to identify your application.
UserID is used to identify your user.
UserSig is a security signature calculated based on the first two using the HMAC SHA256 encryption algorithm. As long as attackers cannot forge the UserSig, they cannot steal your cloud service traffic.
How to calculate UserSig during the debugging phase?
you can calculate and obtain UserSig using either Client Sample Code or the Console. Please refer to the following introduction for details.
Unsafe:
Note that the following two UserSig acquisition calculation schemes are only suitable for debugging. If the product is to be officially launched, using these schemes is not recommended because the SECRETKEY in the client code (especially on the Web) is easily vulnerable to decompilation and reverse engineering. 
Client calculation of UserSig
1. Get SDKAPPID and Key:
Log in to Tencent-RTC Console > App Management.
Locate the app with the desired SDKAppID, click its name for details.
Click on SDKSecretKey to reveal and copy.
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2. Calculate UserSig:
To facilitate client use, we provide source files for calculating UserSig on various platforms. You can download and use them directly:
Android
iOS
Web
Windows(C++)
Windows(C#)
Flutter
Mac
﻿Github﻿
﻿Github﻿
﻿Github﻿
﻿Github﻿
﻿Github﻿
﻿Github﻿
﻿Github﻿
The sample code is as follows (of course, you can also refer to the demo projects of our products, see the development documentation of each product):
Android
iOS
Web
Window(C++)
Window(C#)
Flutter
Mac
// Step 1: Import the source file
import com.xxx.xxx.GenerateTestUserSig;
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps
GenerateTestUserSig.SDKAPPID = xxxxxx;
GenerateTestUserSig.SECRETKEY = "xxxxxx";
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// Step 3: Generate userSig based on userID
String userSig = GenerateTestUserSig.genTestUserSig("userID");
// Step 1: Import the header file
#import "GenerateTestUserSig.h"
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps
[GenerateTestUserSig setSDKAPPID:xxxxxx];
[GenerateTestUserSig setSECRETKEY:@"xxxxxx"];
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// Step 3: Generate userSig based on userID
NSString *userSig = [GenerateTestUserSig genTestUserSig:@"userID"];
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// Step 1: Import the module
<script src='js/libs/lib-generate-test-usersig.min.js'></script>
<script src='js/libs/generateTestUserSig.js'></script>
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps, enter the custom userID, and generate userSig
const {sdkAppId, userSig } = genTestUserSig({
	sdkAppId: xxxxxx, 
	userId: 'xxxxxx',
	sdkSecretKey: 'xxxxxx',
}
// Step 1: Import the header file
#include "GenerateTestUserSig.h"
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps
const int SDKAPPID = xxxxxx;
const char* SECRETKEY = "xxxxxx";
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// Step 3: Generate userSig based on userID
const char* userSig = GenerateTestUserSig::genTestUserSig("userID", SDKAPPID, SECRETKEY);
// Step 1: Import the header file
using GenerateTestUserSig;
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps
GenerateTestUserSig.SDKAPPID = xxxxxx; 
GenerateTestUserSig.SECRETKEY = "xxxxxx";
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// Step 3: Generate userSig based on userID
string userSig = GenerateTestUserSig.GetInstance().GenTestUserSig("userID");
// Step 1: Import the source file
import 'package:xxx/GenerateTestUserSig.dart';
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// Step 2: Fill in the SDKAppID and SDK key obtained from the previous steps
GenerateTestUserSig.SDKAPPID = xxxxxx;
GenerateTestUserSig.SECRETKEY = "xxxxxx";
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// Step 3: Generate userSig based on userID
String userSig = GenerateTestUserSig.genTestUserSig("userID");
// Step 1: Import the header file
#import "GenerateTestUserSig.h"
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// Step2: Enter the SDKAppID and SDK secret obtained in the Back step
[GenerateTestUserSig setSDKAPPID:xxxxxx];
[GenerateTestUserSig setSECRETKEY:@"xxxxxx"];
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// Step 3: Generate userSig based on userID
NSString *userSig = [GenerateTestUserSig genTestUserSig:@"userID"];
Get UserSig from the console
Log in to Tencent-RTC Console, navigate to Development Tools > UserSig Tools.
Under the UserSig Generation Tool, select the corresponding SDKAppID and UserID.
Click the Generate button to compute the corresponding UserSig.
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How to calculate UserSig during the official operation phase?
During the official operation phase, Tencent-RTC provides a more secure server-side UserSig calculation solution. This maximizes the protection of the key used to calculate UserSig from being leaked, as compromising a server is more difficult than reverse engineering an app. The specific implementation process is as follows:
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1. Before your app calls the SDK initialization function, it must first request UserSig from your server.
2. Your server calculates UserSig based on SDKAppID and UserID. Refer to the first part of the documentation for the source code.
3. The server returns the calculated UserSig to your app.
4. Your app passes the obtained UserSig to the SDK via a specific API.
5. The SDK submits SDKAppID + UserID + UserSig to Tencent CVM for verification.
6. Tencent Cloud verifies UserSig to confirm its validity.
7. After verification, Tencent-RTC services will be provided to the Tencent-RTC SDK.
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To simplify your implementation process, we provide UserSig Calculation Source Code and examples in multiple language versions:
Language Version
Signature algorithm
Source Code
Usage Examples
Java
HMAC-SHA256
﻿genSig﻿
﻿Github﻿
GO
HMAC-SHA256
﻿genSig﻿
﻿Github﻿
PHP
HMAC-SHA256
﻿genSig﻿
﻿Github﻿
Node.js
HMAC-SHA256
﻿genSig﻿
﻿Github﻿
Python
HMAC-SHA256
﻿genSig﻿
﻿Github﻿
C#
HMAC-SHA256
﻿GenSig﻿
﻿Github﻿
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Android	iOS	Web	Windows(C++)	Windows(C#)	Flutter	Mac
Github	Github	Github	Github	Github	Github	Github
Language Version	Signature algorithm	Source Code	Usage Examples
Java	HMAC-SHA256	genSig	Github
GO	HMAC-SHA256	genSig	Github
PHP	HMAC-SHA256	genSig	Github
Node.js	HMAC-SHA256	genSig	Github
Python	HMAC-SHA256	genSig	Github
C#	HMAC-SHA256	GenSig	Github