[Windows] Installing OpenSSL

Getting tools and sources

To install OpenSSL, I have to build it from source.
I can get the source from its GitHub repository.

• openssl - GitHub

git clone https://github.com/openssl/openssl.git

To build it, I need install Visual Studio(and components for C++ Desktop Development), Perl and NASM.

I installed Visual Studio Community 2022, Strawberry Perl, and NASM.

• Visual Studio Community
• Strawberry Perl for Windows
• NASM

Most of the installation steps are described in the documentation.

• Notes for Windows platforms - openssl - GitHub

However, there are two things to note.

1. Should not use the default installed Command Prompt or PowerShell

I must use the "x64 Native Tools Command Prompt for VS 2022" installed with Visual Studio.
Otherwise I will get errors on executing "nmake".

2. Execute "nmake install" as Administrator

I must execute "nmake install" as Administrator to avoid permission denied.

Now I can execute OpenSSL commands.