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Exemplo Rust: Gerar par de chaves pública/privada usando sodiumoxide e salvar em arquivo

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Este programa simples em Rust demonstra como gerar um par de chaves pública/privada usando o crate sodiumoxide e salvar as chaves em arquivos no formato base64.

src/main.rs
use sodiumoxide::crypto::sign;
use std::fs::File;
use std::io::Write;
use std::path::Path;
use base64::{Engine as _, engine::general_purpose};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Inicializar sodiumoxide
    sodiumoxide::init().expect("Failed to initialize sodiumoxide");

    // Gerar um novo par de chaves
    let (public_key, secret_key) = sign::gen_keypair();

    // Converter chaves para base64
    let public_key_b64 = general_purpose::STANDARD.encode(public_key.as_ref());
    let secret_key_b64 = general_purpose::STANDARD.encode(secret_key.as_ref());

    // Definir caminhos dos arquivos
    let public_key_path = Path::new("public_key.b64");
    let secret_key_path = Path::new("secret_key.b64");

    // Salvar chave pública em arquivo
    let mut public_key_file = File::create(public_key_path)?;
    public_key_file.write_all(public_key_b64.as_bytes())?;

    // Salvar chave secreta em arquivo
    let mut secret_key_file = File::create(secret_key_path)?;
    secret_key_file.write_all(secret_key_b64.as_bytes())?;

    println!("Key pair generated and saved successfully!");
    println!("Public key saved to: {:?}", public_key_path);
    println!("Secret key saved to: {:?}", secret_key_path);

    Ok(())
}
Cargo.toml
[package]
name = "MakeKeyPair"
version = "0.1.0"
edition = "2021"

[dependencies]
sodiumoxide = "0.2"
base64 = "0.21"

Como executar

run.sh
cargo run

Saída

output.txt
Public key saved to: "public_key.b64"
Secret key saved to: "secret_key.b64"
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