utils VS rusty-dos

I didn't use any inline asm, instead I wrote the simplest if statement possible, which I confirmed on x86_64, x86, and aarch64 compiles down to use the platform's supported conditional move instructions. If this changes in the future and there's a need to write inline asm, you can do so in a portable way, e.g. the cmov crate.

There's also cpufeatures which might suit your use case better (depending on exactly how you want to do it).

I have seen that RustCrypto also offers a create for securely zeroing memory with: zeroize

The zeroing routine itself looks fine to me. You might want to compare your code with the (already mentioned) zeroize crate, which does something similar (or maybe identical?).

To save a few clicks, this was found to be, indeed, a Y2K issue, and der v0.4.1 has just been released to fix it. Citing the comment added to the issue after the fact:

I opened a tracking issue for that.

https://github.com/RustCrypto/utils/pull/325#issuecomment-791503136

Some kind of framework: https://github.com/Serentty/rusty-dos

I assume that's what rusty-dos is using, given this bit from the README:

I know, but if you want to do dos, you can .

Now, being both a Rust enthusiast and MS-DOS nostalgic, I have, multiple times, tried closing the gap on writing applications for real DOS systems in Rust. Unfortunately, this is not without issues, and there is not a clear path on how to go with this yet. More on existing efforts here.