Galileo OSNMA (Open Service Navigation Message Authentication) is a protocol that will allow Galileo GNSS receivers to authenticate cryptographically the navigation data that is broadcast by Galileo satellites. The system is currently in a public test phase and according to the roadmap it will begin the initial service in 2023.
This month I have spent some time working in a new Rust library that implements the receiver-side processing of OSNMA. The library is called galileo-osnma. Although there are still some features that are not implemented, and some other future ideas that I have for this library, it has already reached a point where I feel it can be released and used by others. In its present state it is already able to perform all the steps that are needed to check all the OSNMA authentication data that is currently being transmitted by the satellites during the test phase. The library is licensed under a permissive open source license (Apache + MIT, which is common in the Rust ecosystem).