Upgrade to rust 2024 edition

[dvaembit]

This bumps the rust edition to 2024, which includes:

• Requiring rust 1.85+ (released Feb. 20, 2025)
• Avoiding the new keyword gen re: the rand crate.
• Using the newer docsrs cfg check instead of docs_rs (doc link)

[fadeevab]

Wow, somebody still uses this crate (the first PR since 2024) 😄

Anyway. We also have to bump the version to 0.5.0 in Cargo.toml.

[dvaembit]

Wow, somebody still uses this crate (the first PR since 2024) 😄

No time like the present! 😄

I am in the process of evaluating it. The encryption scheme seems nicely defined. However I was curious whether it has been extensively battle tested. It doesn't have many dependents listed on crates.io but that seems like an unreliable indicator. Do you still use this yourself for anything production grade?

Anyway. We also have to bump the version to 0.5.0 in Cargo.toml.

I just pushed this change.

[fadeevab]

This crate is usually used by binaries, which are not usually published on crates.io, so I guess it doesn't have many dependents.

I built it for a project that eventually didn't take off, so I stopped actively developing it. That said, I think cocoon is well-defined, and I even fixed a medium-severity CVE a few years ago.

I guess what I don't know without feedback is whether the API has any inconveniences. You might also want to use an Argon2-based KDF, which could be added to the library.

You may want to start with MiniCocoon.

And I'd love to hear any feedback after accepting or rejecting the library!

P.S.: I will try to publish new version today.

[fadeevab]

@dvaembit Published v0.5.0. Thank you!