I tried my hands at programming in Rust. This is supposedly a "ransomware" but it's not functional at all. I'd say please don't use this for nefarious reasons, but given the state of this, please don't use it at all, as currently it only has the potential to fuck shit up, and nothing more.
As far as I remember this was only successfully encrypting/decrypting text files, not binaries or images, or anything remotely useful for that matter.