OpenSSL is only needed for signing the bootloader and application images when booting using a bootloader.

Below are the steps for installing OpenSSL:

For Windows

1. Download OpenSSL v1.1.1w Light: OpenSSL Download.
2. Install to the default path and follow the prompted steps.
3. When prompted, select to install binaries to /bin folder instead of the Windows system path.
4. Add path to OpenSSL in enviroment "Path" variables: C:/Program Files/OpenSSL-Win64/bin.
   
   

   

   
   Figure 2-1 OpenSSL Path in System Environment Variables

For Linux

1. Run the following command in Linux Ubuntu shell to install:

   $ sudo apt install openssl