FaCT

In general you don’t need things that fancy. Instead, you can take 1. Some known set of architectures, with 2. Some known set of (constant time/variable time) operations And then prove things about programs written against those architectures. See for example https://github.com/PLSysSec/FaCT That being said, practically the operations that are variable time are known, and are mostly* the same on all modern architectures. In particular 1. Branching on a secret-dependent variable, or 2. Indexing an array with a secret-dependent index, or 3. Some architecture specific operations (typically things like division, occasionally things like multiplications/shifting).

There's been plenty, like RobustIsoCrypt or FaCT: https://github.com/PLSysSec/FaCT They struggle to guarantee constant time for subroutines within a non-constant time application, which is how most people want to use cryptography.

While it would be nice, this is somewhat mitigated by the fact that they've got a top-level directory called "example." https://github.com/PLSysSec/FaCT/blob/master/example/example...

A follow-up to the FaCT paper can be found here: https://github.com/PLSysSec/FaCT/blob/master/FaCT_extended.p.... The source for the compiler is in the same repo. (Full disclosure: I’m a co-author.) There were a few interesting issues we ran into when implementing the compiler that we did not anticipate when writing the paper you linked (e.g., there are cases where making code constant-time can inadvertently introduce memory errors). You can try out the language here (based on Compiler Explorer): https://fact.sysnet.ucsd.edu/

Something like FaCT? https://github.com/PLSysSec/FaCT

Their README did not say anything about what the project is but they have another document in the repo root that does. https://github.com/PLSysSec/FaCT/blob/rewrite/proposal.md

If that interests you you should take a look at https://github.com/PLSysSec/FaCT

The language is actually called ConstantC, and its implementation has just been made public on GitHub: https://github.com/PLSysSec/FaCT