refactor: use rsa instead of openssl

[dessalines]

Requirements

• [X] Is this a feature request? For questions or discussions use https://lemmy.ml/c/lemmy_support
• [X] Did you check to see if this issue already exists?
• [X] Is this only a feature request? Do not put multiple feature requests in one issue.
• [X] Is this a backend issue? Use the lemmy-ui repo for UI / frontend issues.
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Is your proposal related to a problem?

Use the rsa crate instead of openssl, as this will make lemmy much more portable.

It also could potentially mean we could stop using these custom docker images (iirc bundling openssl was one of the main reasons they're necessary, and also possibly postres libs)

Describe the solution you'd like.

NA

Describe alternatives you've considered.

NA

Additional context

https://github.com/LemmyNet/activitypub-federation-rust/pull/116

cc @kwaa

[kwaa]

It looks like Lemmy is only using OpenSSL here, and this file is not used.

Maybe delete it to solve this issue? I can create a PR.

[kwaa]

Lemmy:

• [x] activitypub-federation (0.5.8) (https://github.com/LemmyNet/activitypub-federation-rust/pull/116, https://github.com/LemmyNet/activitypub-federation-rust/pull/118#event-13507502246)
• [x] lemmy-utils (https://github.com/LemmyNet/lemmy/pull/4901)

Other libraries with openssl / native-tls deps:

• [x] reqwest (https://github.com/LemmyNet/lemmy/pull/4901/commits/11e9d7a47fb490101f2c69699232f259b2e8b427)
• [x] lettre (https://github.com/LemmyNet/lemmy/pull/4901/commits/11e9d7a47fb490101f2c69699232f259b2e8b427)

[dessalines]

Ya, if its unused go ahead and delete it in a PR.

reqwest might already have a non-openssl feature that we just need to use: https://docs.rs/reqwest/latest/reqwest/#optional-features

lettre would also appreciate a PR I'm sure, and we stay on the latest versions of that also.

[kwaa]

lettre would also appreciate a PR I'm sure, and we stay on the latest versions of that also.

lettre also has rustls-tls feature: https://github.com/lettre/lettre/blob/0132bee59d4963ba21c532b35281e00aae8ce81e/Cargo.toml#L111

I can't test them since I don't plan to clone Lemmy locally.

[dessalines]

I'll test that one and add it to your PR

[kwaa]

Lemmy's Cargo.lock no longer contains openssl, so this issue can be closed.

[dessalines]

Thx for helping with this!

[Nutomic]

Blocked by https://github.com/LemmyNet/lemmy/pull/4904

[Nutomic]

https://github.com/LemmyNet/lemmy/pull/4976