OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.
You can download it from the following link: https://packetstormsecurity.com/files/download/161976/openssl-1.1.1k.tar.gz
Source: https://packetstormsecurity.com/files/161976/OpenSSL-Toolkit-1.1.1k.html