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Kensan

@hannesm @djm We did something like this for IKEv2 with TKM, which is part of strongSwan. (Library) Code generator which includes FSM and SPARK proof aspects for state transitions.

codelabs.ch/tkm/

@senier et al (now at AdaCore) has done a project called RecordFlux, which does much more: you can specify the protocol in a DSL and the tools will generate SPARK code with some formal guarantees. NVIDIA has actually used it in production.
Also, the code is opensource and up on GitHub.

codelabs.chTKMTrusted Key Manager in Ada