RSAキーペアを作ってそれをテキスト形式にするRustスクリプト

Cargo.toml

[package]
name = "rsa_pem_test"
version = "0.1.0"
authors = ["YuzuRyo61"]
edition = "2018"

[dependencies]
bcrypt = "*"
openssl = "*"
pem = "*"

main.rs

extern crate openssl;
extern crate pem;

use openssl::rsa::Rsa;
use pem::{Pem, encode};

fn main() {
    let rsa = Rsa::generate(2048).unwrap();
    // 無駄な変数をすぐに破棄するように改良
    let pem_pri_string = {
        let pem_rsa_pri = Pem {
            tag: String::from("RSA PRIVATE KEY"),
            contents: rsa.private_key_to_pem().unwrap()
        };
        encode(&pem_rsa_pri)
    };
    let pem_pub_string = {
        let pem_rsa_pub = Pem {
            tag: String::from("PUBLIC KEY"),
            contents: rsa.public_key_to_pem().unwrap()
        };
        encode(&pem_rsa_pub)
    };
    println!("{}", pem_pri_string);
    println!("{}", pem_pub_string);
}