The Illustrated DTLS Connection
Published at https://dtls.xargs.org
site/: page source for the finished product
server/server.c: server code
client/client.c: client code
wolfssl/: patch and build of wolfSSL that removes any random aspects of the documented connection
captures/: PCAP and keylog files
See also https://github.com/syncsynchalt/illustrated-tls13 for a TLS 1.3 version of this project.
If you'd like a working example that reproduces the exact handshake documented on the site:
git clone https://github.com/syncsynchalt/illustrated-dtls.git cd illustrated-dtls/ cd wolfssl/ make cd ../server/ make cd ../client/ make
Then open two terminals and run
./server in the server/ subdir and
./client in the client/ subdir.
This has been shown to work on MacOS 12 and various Linuxes and only has a few easy-to-find dependencies: gcc or clang, make, patch, etc.