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Rust example: Generate public/private key pair using sodiumoxide and save to file

This simple Rust program demonstrates how to generate a public/private key pair using the sodiumoxide crate and save the keys to files in base64 format.

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>> {
    // Initialize sodiumoxide
    sodiumoxide::init().expect("Failed to initialize sodiumoxide");

    // Generate a new key pair
    let (public_key, secret_key) = sign::gen_keypair();

    // Convert keys to 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());

    // Define file paths
    let public_key_path = Path::new("public_key.b64");
    let secret_key_path = Path::new("secret_key.b64");

    // Save public key to file
    let mut public_key_file = File::create(public_key_path)?;
    public_key_file.write_all(public_key_b64.as_bytes())?;

    // Save secret key to file
    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"

How to run

run.sh
cargo run

Output

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