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And it has a BSD license, too. Unfortunately it's written in Python. I don't see Python becoming a requirement to update FreeBSD.

There is also a BSD-licensed version that we wrote in Go: https://github.com/flynn/go-tuf

But then you would have to ship and support a go compiler with base, which is a similar problem but easier to overcome.

Or ship compiled static binaries.

This would be more feasible, but we'd still need Go in the src tree so users can reproduce them.

The website says there are Python, Ruby, Go, and Haskell implementations of the framework.