FireDaemon OpenSSL
OpenSSL Binary Distributions for Microsoft Windows
OpenSSL is a popular open-source software library that provides a robust, full-featured set of cryptographic functions and tools to secure communications over computer networks. It implements the Transport Layer Security (TLS) protocol, which is used to encrypt data transmissions between web servers and clients, such as web browsers. OpenSSL provides a wide range of cryptographic functions, including symmetric encryption, public-key encryption, message digest and hash functions, digital signatures, and random number generation. It supports a large number of classical cryptographic algorithms, such as AES, RSA, SHA, and post-quantum algorithms such as ML-KEM, ML-DSA, and SLH-DSA. In addition to cryptographic functions, OpenSSL also provides utilities for generating and managing digital certificates and keys, creating and verifying digital signatures, and performing TLS handshakes and negotiations. OpenSSL is available on various operating systems, including Linux, Windows, and macOS. It is used by many software applications, including FireDaemon Certify One, FireDaemon Fusion, and FireDaemon Lozenge. OpenSSL is an important component of many security-related operating systems and services. We have made available our binary distributions of OpenSSL for Microsoft Windows for packaged as Windows installers or ZIP files. Our OpenSSL binary distributions can be used for free, standalone or embedded in your own software projects or software products.
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FireDaemon OpenSSL Binary Distributions
3.6.0, 3.5.4 LTS, 3.0.18 LTS, 1.1.1w October 2025
Free
Features at a glance
Latest Versions
Latest versions of OpenSSL, including 3.6, 3.5, 3.0, and 1.1.1, with support for SSL/TLS, multiple cryptographic functions and algorithms, and certificate management.
Binary Distribution
Compiled for Microsoft Windows with no external dependencies. EXEs and DLLs are digitally signed with our Extended Validation (EV) code signing certificate.
Simple Installation
Available in ZIP format for you to integrate into your installer, platform, or for portable deployments. An MSI-based Windows installer is also available.
Screenshots

This screenshot shows how to create a certificate signing request (CSR) using an elevated PowerShell 7 window.

Tell your project where to find the OpenSSL header files by adding the include folder path in your C/C++ settings.

Tell your project which OpenSSL libraries to link by adding libcrypto.lib and libssl.lib to the Linker’s Additional Dependencies.

This screenshot shows how to create a certificate signing request (CSR) using an elevated PowerShell 7 window.