Secure messaging is a chatting application that offers confidentiality, integrity and reliability. It achieves confidentiality and integrity through authenticated encryption, whereas reliability with TCP communications. Secure messaging works on Unix-like systems; we tested it on x86_64 Linux and intel/apple-silicon Mac.
Just make (or make all) to compile the code. We tested it on gcc 9.3.0 and clang 12.0.5. Openssl >= 1.1 is required (check the makefile for the install path on mac). After compiling, two files are created (server_main.out and client_main.out). Just open at least two terminal windows and execute them.
The entire documentation is available on the wiki.