Idiomatic Rust Snippets

Bcrypt Algorithm (WIP)

Bcrypt is a password hashing function designed to be computationally expensive to resist brute-force attacks.

Below is a simple implementation of the bcrypt algorithm in Rust without using any external libraries.

extern crate rand;
use rand::{thread_rng, Rng};
use rand::distributions::Alphanumeric;
use std::time::{SystemTime, UNIX_EPOCH};
use std::convert::TryInto;

const BCRYPT_COST: u32 = 12;
const BCRYPT_SALT_LEN: usize = 16;
const BCRYPT_HASH_LEN: usize = 24;

fn generate_salt() -> String {
    let salt: String = thread_rng()
        .sample_iter(&Alphanumeric)
        .take(BCRYPT_SALT_LEN)
        .map(char::from)
        .collect();
    salt
}

fn bcrypt_hash(password: &str, salt: &str) -> String {
    let mut hash = vec![0u8; BCRYPT_HASH_LEN];
    let cost = BCRYPT_COST;
    let password_bytes = password.as_bytes();
    let salt_bytes = salt.as_bytes();

    // Simulate bcrypt hashing (this is a simplified version)
    for i in 0..BCRYPT_HASH_LEN {
        hash[i] = password_bytes[i % password_bytes.len()] ^ salt_bytes[i % salt_bytes.len()] ^ (cost as u8);
    }

    base64::encode(&hash)
}

fn main() {
    let password = "my_secure_password";
    let salt = generate_salt();
    let hashed_password = bcrypt_hash(password, &salt);

    println!("Password: {}", password);
    println!("Salt: {}", salt);
    println!("Hashed Password: {}", hashed_password);
}

A random salt of length 16 is generated using the rand crate. The bcrypt_hash function simulates the bcrypt hashing process. It combines the password, salt, and cost to produce a hashed password.

Note: This is a simplified version of the bcrypt algorithm for educational purposes. In a real-world application, you should use a well-tested library like bcrypt crate for password hashing.