Add CBMC scaffolding + CI and initial (trivial) sha2_256_init proof#16
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This add a nix development setup that includes dependencies required for developing CBMC proofs. I have excluded various things from the mlkem-native setup that we can consider adding later - HOL-Light (including s2n-bignum proof infrastructure) - SLOTHY - Valgrind (including the KyberSlash paches) - Big-endian cross compilers Signed-off-by: Matthias J. Kannwischer <matthias@kannwischer.eu>
Setup heavily based on mlkem-native. Also see https://github.com/model-checking/cbmc-starter-kit Signed-off-by: Matthias J. Kannwischer <matthias@kannwischer.eu>
The setup is closely following mlkem-native (which makes it slightly more elaborate than we need right now, but it will make it easier in the future to align the functonality). Signed-off-by: Matthias J. Kannwischer <matthias@kannwischer.eu>
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This PR adds everything that is needed to get started with CBMC proofs:
nix develop)For getting started with CBMC take a look at the mlkem-native Proof Guide.
For inspiration about how to prove code, both the proofs in mlkem-native and mldsa-native are great resources.