wolfSSL is a lightweight, portable, C-language-based SSL/TLS library designed for standard, embedded, and RTOS environments. It also operates in desktop, enterprise, and cloud environments. The library supports TLS 1.3 and DTLS 1.3 on both client and server sides, and is up to 20 times smaller in footprint than OpenSSL. It includes an OpenSSL compatibility layer, OCSP and CRL support, and is backed by the wolfCrypt cryptography engine. wolfCrypt, the underlying crypto module, holds FIPS 140-3 validation (Certificates #4718 and #5041) and is DO-178C DAL-A certified for avionics use. wolfSSL's product suite includes: - wolfSSL/wolfCrypt: TLS library and embedded crypto engine - wolfCrypt FIPS 140-3: FIPS-validated cryptographic module - wolfHSM: Hardware Security Module support - wolfTPM: Portable TPM 2.0 library - wolfMQTT: MQTT client library - wolfSSH: SSH library - wolfBoot: Secure bootloader - wolfSentry: Embedded IDPS - curl/tinycurl: HTTP transfer library - wolfSSL JNI/JSSE and wolfCrypt JNI/JCE: Java provider integrations - wolfCLU: Command-line utility The library is dual-licensed under GPLv3 and a commercial license. It is used across markets including automotive, aviation, smart grid, military, government, IoT, mobile, cloud, and industrial automation. Over 5 billion devices and applications are reported to use wolfSSL products.