Simple IOTA Seed & Argon2 Hash Generator written in Rust

iotaseed.rs

extern crate rand;
extern crate argon2rs;

use rand::distributions::{Range, IndependentSample};
use rand::OsRng;
use std::{thread, time};

fn main() {
    let alphabet = ["9", "A", "B", "C", "D", "E", "F", "G", "H", "I",
        "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S",
        "T", "U", "V", "W", "X", "Y", "Z"];

    let between = Range::new(0, alphabet.len());
    // use cryptographically secure OsRng, which collects entropy from current operating system
    let mut rng = OsRng::new().unwrap();

    for i in 1..6 {
        println!("Generating {}. IOTA seed...", i);
        println!("");

        let mut seed = String::new();
        for _ in 0..80 {
            seed += alphabet[between.ind_sample(&mut rng)];
        }

        println!("Seed");
        println!("{}", seed);
        println!("");

        // print argon2 hash

        println!("Argon2 Hash using salt 'cyka bylat'");
        let salt = "cyka bylat";

        let result = argon2rs::argon2i_simple(&seed, salt);
        for byte in result.iter() {
            print!("{:02x}", byte);
        }

        println!("");
        println!("");
    }
}