sslshake

https://github.com/arlimus/sslshake

This is a library to simulate SSL and TLS handshake from SSLv2, SSLv3, to TLS 1.0-1.2. It does not rely on OpenSSL and is not designed as a replacement either. It targets full support for even older handshakes, which are not available in current releases of OpenSSL anymore. It also aims to be executable on all systems with a sufficiently modern version of Ruby without any additional requirements or pre-compiled binaries.