Hash Comparison

main.rs

use crypto_hash::*;

// Converts a 32-bit unsigned integer into its respective byte array
fn u32_bytes (x: u32) -> [u8; 4] {
    [
        (x >> 0x0 * 8) as u8,
        (x >> 0x1 * 8) as u8,
        (x >> 0x2 * 8) as u8,
        (x >> 0x3 * 8) as u8,
    ]
}

fn main () {
    let matching = 3; // How many bytes from the beginning of the hash must match?
    let s = b"GeekLaunch"; // String to match hashes against

    println!("{:?}", s);
    let h = digest(Algorithm::SHA256, s);
    println!("{}", &hex::encode(&h)); // a17d5669f2148e2982baab7c0b4c7d81100c7cf52c45a8d7deb429aeba156ea6

    for x in 0..u32::max_value() {
        if x % 50000 == 0 {
            println!("{}", &x);
        }

        let b = u32_bytes(x);

        let h2 = digest(Algorithm::SHA256, &b);

        // Compare slices
        if h[0..matching] == h2[0..matching] {
            println!("{}: {:?} -> {:?}", &x, &b, &hex::encode(&h2)); // 1709934: [110, 23, 26, 0] -> "a17d560dfc6c675b65b33643fe8156f5ccdf97d8120e70c3c2e27cdc55142c50"
            break;
        }
    }
}