How to Build OpenSSL 1.0 on Windows

In order to build OpenSSL on Windows for use with POCO using Visual Studio 2015, follow these steps:

Note: this covers OpenSSL 1.0. For OpenSSL 1.1, see here (coming soon).

Set Up Prerequisites

Download and install the following software packages:

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

Launch a VS2015 x86 Native Tools Command Prompt and cd into the openssl-1.0.2o directory. Then run the following commands below.

Note: each configuration (static, DLL, 32-bit, 64-bit) must be built in a fresh directory.

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

> nmake -f ms\nt.mak

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

> nmake -f ms\nt.mak install

> nmake -f ms\ntdll.mak

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

> nmake -f ms\ntdll.mak install

Congratulations, you have successfully built OpenSSL.

Launch a VS2015 x64 Native Tools Command Prompt and cd into a freshly extracted the openssl-1.0.2o directory. Then run the commands below.

Configure OpenSSL to be installed into C:\OpenSSL-Win64. You can of course also specify a different directory.

> perl Configure VC-WIN64A no-asm --prefix=C:\OpenSSL-Win64
> ms\do_win64a

> nmake -f ms\nt.mak

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

> nmake -f ms\nt.mak install

> nmake -f ms\ntdll.mak

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

> nmake -f ms\ntdll.mak install