Building OpenSSL on Windows

In order to build OpenSSL on Windows for WebTunnelAgent using Visual Studio 2015/2017, follow these steps:

Set Up Prerequisites

Download and install the following software packages:

• 7-Zip to unpack the OpenSSL source code archive (.tar.gz)
• Perl (ActiveState) in order to build OpenSSL

Get OpenSSL Sources

• Get the OpenSSL sources from the OpenSSL Downloads Page.
• Unpack the source code package (openssl-1.0.2l.tar.gz) using 7-zip. This is a two-step process. First, expand the GZip-compressed .tar.gz, then unpack the openssl-1.0.2l.tar file, resulting in a directory named openssl-1.0.2l.

Build OpenSSL Static Libraries

Launch a x86 Native Tools Command Prompt for Visual Studio 2015/2017 and cd into the openssl-1.0.2l directory. Then run the following commands:

Configure OpenSSL

Configure OpenSSL to be installed into C:\OpenSSL-Win32. You can of course also specify a different directory.

> perl Configure VC-WIN32 no-asm --prefix=C:\OpenSSL-Win32
> ms\do_ms

Build OpenSSL Libraries

This will take a couple of minutes.

> nmake -f ms\nt.mak 

Install OpenSSL Libraries

This will install the libraries, executables and header files into the directory specified in the Configure step.

> nmake -f ms\nt.mak install

Congratulations, you have successfully built OpenSSL.