use sha2::Digest;

pub fn hash_bigint(n: usize, i: &num::BigInt) -> Vec<u8>
{
    let (_, bytes) = i.to_bytes_be();
    assert!(bytes.len() <= n);

    let mut hash = sha2::Sha512::new();
    hash.input(vec![0; n - bytes.len()]);
    hash.input(bytes);

    hash.result().to_vec()
}

pub fn show_hash(h: &Vec<u8>)
{
    for x in h
    {
        print!("{:02x}", x);
    }

    println!();
}