How to Integrate OpenSSL into Visual Studio Projects?

How to Include OpenSSL in Visual Studio

Introduction

This guide applies to any OpenSSL version and any Visual Studio version.

Prerequisites

Ensure you have OpenSSL installed. The precompiled installer for Windows includes the necessary libraries.

Configuring the Compiler

1. In "Project Properties" under "C/C " and "General," add the OpenSSL include directory to "Additional Include Directories." This typically resembles:
   "C:Program FilesOpenssl-Win32-1.0.1p.....include"

Configuring the Linker

1. Under "Project Properties" > "Linker" > "General" > "Additional Library Directories," add the OpenSSL library directory. This typically looks like:
   "C:Program FilesOpenssl-Win32-1.0.1p.....lib"

2. Under "Project Properties" > "Linker" > "Input" > "Additional Dependencies," include the required OpenSSL libraries:

   • libcrypto-1_(-x64).lib (for versions 1.1.) or libeay32.lib (for older versions)
   • libssl-1_(-x64).lib (for versions 1.1.) or ssleay32.lib (for older versions)

   Note: _static versions are available but may not be necessary.

Building and Running

• Build the project.
• Ensure the OpenSSL library dependencies are located in the PATH environment variable, in the executable's folder, or in a directory included in the PATH.

Example Include

In your code, include the OpenSSL header file as follows:

#include <openssl/ssl.h>

Conclusion

By following these steps, you can incorporate OpenSSL into your Visual Studio projects, enabling you to work with SSL/TLS protocols and encryption operations.

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