Does your Application or Device Need SSL/TLS?

The wolfSSL embedded SSL library (formerly CyaSSL) is a lightweight, portable, C-language-based SSL/TLS library targeted at IoT, embedded, and RTOS environments primarily because of its size, speed, and feature set. It works seamlessly in desktop, enterprise, and cloud environments as well. wolfSSL supports industry standards up to the current TLS 1.2 and DTLS 1.2, is up to 20 times smaller than OpenSSL, offers a simple API, an OpenSSL compatibility layer, OCSP and CRL support, is backed by the robust wolfCrypt cryptography library, and much more.

The CMVP has issued FIPS 140-2 Certificate #2425 for the wolfCrypt Module developed by wolfSSL Inc.  For more information, see our FIPS FAQ.

Providing secure communication for IoT, smart grid, connected home, automobiles, routers, applications, games, IP, mobile phones, the cloud, and more.

Copyright 2015 wolfSSL Inc.  All rights reserved.

Embedded SSL Library

for Applications, Devices, IoT, and the Cloud

wolfSSL 3.6.8

Release 3.6.8 fixes two high severity vulnerabilities. Also included are new extensions for cert generation, CRL buffer load, sniffer fixes, and more.

Read More

wolfCrypt Crypto Engine

A lightweight, embeddable, and easy-to-configure crypto library with a strong focus on portability, modularity, security, and feature set .  Read More.

wolfCrypt FIPS Module

The CMVP has issued FIPS 140-2 Certificate #2425 for the wolfCrypt Module developed by wolfSSL Inc.  More Information


A joint white paper published by wolfSSL and Intel titled “Implementation and Performance of AES-NI in CyaSSL Embedded SSL”, details using Intel’s hardware-accelerated AES instructions (AES-NI) with the CyaSSL lightweight SSL library. 

Implementation and Performance of AES-NI in wolfSSL Embedded SSL

wolfSSL | Intel

Download White Paper


wolfSSL focuses on creating high quality, portable, embedded security software.  Current products include the wolfSSL embedded SSL library, wolfCrypt embedded crypto engine, and wolfSSL JNI wrapper. As strong believers in open source, all of wolfSSL’s products are dual licensed under both the GPLv2 as well as standard commercial licensing.

To learn more about wolfSSL and the wolfSSL embedded SSL library, we invite you to read our About Us page, or visit a respective product page.


Are you curious about where wolfSSL products are used? wolfSSL (formerly CyaSSL) is actively being used in a wide range of markets and products including the smart grid, IoT, industrial automation, connected home, M2M, auto industry, games, applications, databases, sensors, VoIP, routers, appliances, cloud services, and more.

Over 500,000,000 applications and devices are secured with wolfSSL products.

To learn more about specific markets which are currently using wolfSSL products, please visit our Case Studies page.


  1. Support Forum

  2. Support Packages

  3. Contact Us

embedded ssl

Download Now

Get the latest open source GPLv2 version now!

Or learn more about commercial license options.

Questions? +1 (425) 245-8247