An MD5 brute-forcer using Rust

main.rs

extern crate crypto;

use crypto::digest::Digest;
use crypto::md5::Md5;

fn brute_force(hash: &str, charset: &str, max_length: usize) {
    for length in 1..=max_length {
        let mut attempt = vec![0; length];
        loop {
            let guess: String = attempt
                .iter()
                .map(|&c| charset.chars().nth(c).unwrap())
                .collect();
            if md5(&guess) == hash {
                println!("Found match: {}", guess);
                return;
            }
            if !increment(&mut attempt, charset.len()) {
                break;
            }
        }
    }
}

fn md5(input: &str) -> String {
    let mut hasher = Md5::new();
    hasher.input_str(input);
    hasher.result_str()
}

fn increment(attempt: &mut Vec<usize>, length: usize) -> bool {
    for i in attempt.iter_mut().rev() {
        if *i < length - 1 {
            *i += 1;
            return true;
        }
        *i = 0;
    }
    false
}

fn main() {
    let hash = "YOUR_MD5_HASH"; // The MD5 hash 
    let charset = "abcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*(){}[]',./?~`\""; // Possible chars
    let max_length = 20; // max length of the md5
    brute_force(hash, charset, max_length);
}