use hmac::{Hmac, Mac};
use sha1::Sha1;

const SHA1_DIGEST_SIZE: usize = 20;

type HmacSha1 = Hmac<Sha1>;

fn main() {
    let args = std::env::args().into_iter().collect::<Vec<String>>();
    println!("Args: {:?}", args);
    let key = hex::decode(&args[1]).expect("Key hex parse failed");
    let data = hex::decode(&args[2]).expect("Data hex parse failed");
    let mut hmac_sha1 = HmacSha1::new_from_slice(&key).unwrap();
    hmac_sha1.update(&data);
    let result = hmac_sha1.finalize();

    let mut code = [0; SHA1_DIGEST_SIZE];
    code.copy_from_slice(result.into_bytes().as_slice());

    println!("{}", hex::encode(&code));
}