C# / Generate a 1024 bits symmetric key for HMAC-SHA256

Here is the way to generate a symmetric key for HMAC-SHA256 encryption, that is needed, for example, in using JWT Security Tokens when providing a REST API :

        private static void GenerateEncryptionKey()
        {
            RNGCryptoServiceProvider cryptoProvider = new RNGCryptoServiceProvider();
            byte[] keyForHmacSha256 = new byte[64];
            cryptoProvider.GetNonZeroBytes(keyForHmacSha256);
            StringBuilder hex = new StringBuilder(keyForHmacSha256.Length * 2);
            foreach (byte b in keyForHmacSha256)
            {
                hex.AppendFormat("{0:x2}", b);
            }
            Console.WriteLine(hex.ToString());
        }

An example of output is composed of 128 bytes, that means 128x8 bits, so 1024 bits :
"401b09eab3c013c48a54922bb802bec8fd531819211125f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f59d3ed1"

You could then copy and paste this generated key into your Token Validation Handler if needed for this purpose...

Android Retrofit2 Image Upload Example (to RESTful API server)

If you need to use Retrofit 2 in your Android application source code, then you can check the following example on GitHub :

https://github.com/reuniware/AndroidRetrofit2ImageUpload

Extension Facebook "Je Suis Suivi" pour Google Chrome

Voici le lien d'installation de l'extension :

http://app.getresponse.com/click.html?x=a62b&lc=BvUFaM&mc=JK&s=5E7lzR&u=hVZ3B&y=d&

How to install the KB2919355 update for Windows (Security update)

In order to install the KB2919355 update (for Windows 8.1 or Windows Server 2012 R2), you must have installed the KB2919442 update before.

This is mandatory when you want to install Microsoft SQL Server 2017 on a Windows Server 2012 R2 machine.

Commet installer la mise-à-jour Windows KB2919355 ?

Si vous avez des problèmes pour installer la mise-à-jour de sécurité KB2919355, sâchez qu'il faut installer préalablement la mise-à-jour KB2919442 avant de lancer l'installation de la KB2919355.

J'ai obtenu cette information sur la page suivante :
https://social.technet.microsoft.com/Forums/en-US/963711a4-e77c-418c-b088-ac54f5e5b4b3/server-2012-r2-unable-to-install-kb2919355?forum=winserver8gen

La mise-à-jour KB2919355 est nécessaire par exemple quand vous souhaitez installer Microsoft SQL Server 2017 sur une machine Windows Server 2012 R2.

How to manually uninstall SQL Server (2017) or any other application

1- Download the following executable file, msiinv.zip from :

https://onedrive.live.com/?authkey=%21ANs8Pr0aVhaT_qQ&cid=27E6A35D1A492AF7&id=27E6A35D1A492AF7%21910&parId=27E6A35D1A492AF7%21376&action=locate

Alternative download link :
https://ufile.io/wv3c3

2- Unpack this file in a temp folder (such as C:\tmp\)

3- In command line, launch powershell


4- In powershell enter :
c:\tmp\msiinv.exe -s | Select-String "SQL Server" -Context 0,1


5- Then you have a list of SQL Server related applications


6- Take each product code and for each one launch msiexe /x such as :
msiexec /x {327B1B40-2434-4DC5-9D4D-B9B24D4B2EDE}


7- Follow steps on screen each time you launch msiexec


8- Launch Regedt32 and delete SQL services in the following key : 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services

How to use ChromeDriver (PhantomJS) through Socks5 proxy in C# ?

Here is a sample project that can be opened with Visual Studio 2017, and that will be a basic sample showing how to connect to a remote website (ipleak.com) through a Socks5 proxy (default is 127.0.0.1:9150) :

Download at :
https://github.com/reuniware/SeleniumChromeDriverBase/blob/master/PhantomJsTest3-Socks5-Proxy.zip

Info at :
https://github.com/reuniware/SeleniumChromeDriverBase

Exemple d'expression lambda en C++ 11

Expression lambda, exemple créé avec Visual Studio 2017

#include "pch.h"
#include <iostream>
using namespace std;
int main()
{
auto p = [] (int a, int b) { cout << "a+b = " << (a+b) << endl; };
p(5,2);
return 0;
}

DI-FileSearch : New file search application for Windows

Direct download of DI-FileSearch from GitHub

Le JavaScript moderne expliqué aux dinosaures :)

Ci-après un lien vers une page expliquant l'utilité de Node.JS, de WebPack, de Babel, et des Task Runners... Un lien en or pour celles et ceux qui souhaitent démystifier ce monde du Node !

Welcome to the Node World !

Modern JavaScript Explained For Dinosaurs