rsa decrypt rust lang example

gistfile1.txt

[package]
name = "rsa-decrypt"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
openssl = "0.10.53"

main.rs

use openssl::rsa::{Padding, Rsa};
use std::fs::File;
use std::io::Read;
use std::str;

fn main() {
    // Read the private key from a PEM file
    let mut key_file = File::open("priv.pem").unwrap();
    let mut key_buffer = Vec::new();
    key_file.read_to_end(&mut key_buffer).unwrap();

    // Load the private key from the PEM data
    let rsa = Rsa::private_key_from_pem(&key_buffer).unwrap();

    let data = b"foobar";
    let mut buf = vec![0; rsa.size() as usize];
    let encrypted_len = rsa.public_encrypt(data, &mut buf, Padding::PKCS1).unwrap();

    let mut decrypted_buf = vec![0; rsa.size() as usize];
    let decrypted_len = rsa.private_decrypt(&buf[..encrypted_len], &mut decrypted_buf, Padding::PKCS1).unwrap();

    let decrypted_data = &decrypted_buf[..decrypted_len];
    println!("Decrypted data: {:?}", str::from_utf8(decrypted_data));
}