notes/school/intro-crypto/uebung/05/p/src/main.rs

const P: [usize; 32] = [
    16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19,
    13, 30, 6, 22, 11, 4, 25,
];

fn p<T: Copy + Default>(i: [T; 32]) -> [T; 32] {
    let mut res: [T; 32] = [T::default(); 32];
    for (i, p) in i.iter().zip(P.iter()) {
        res[*p - 1] = *i;
    }
    res
}

fn main() {
    let i: [u8; 32] = [
        1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1,
        0, 1,
    ];
    p(i).iter().for_each(|i| print!("{}", i));
    println!();

    let p = &[
        true, false, false, false, false, false, true, false, false, true, true, true, true, false,
        false, true, true, true, false, true, false, true, true, true, true, false, true, true,
        true, false, true, true,
    ];
    let l0 = &[
        true, true, true, true, true, true, true, true, true, true, true, true, true, true, true,
        true, true, true, true, true, true, true, true, true, true, true, true, true, true, true,
        true, true,
    ];

    p.iter()
        .zip(l0.iter())
        .map(|(a, b)| a ^ b)
        .map(|x| if x { '1' } else { '0' })
        .for_each(|x| print!("{}", x));
    println!();

    let lo = b"11111111111111111111111111111101";
    let ln = b"11111111111111111111111111111111";
    let cl = lo.iter().zip(ln.iter()).filter(|(a, b)| a != b).count();
    println!("cl = {}", cl);

    let ro = b"01111101101001100010100011000100";
    let rn = b"01111101100001100010100001000100";
    let cr = ro.iter().zip(rn.iter()).filter(|(a, b)| a != b).count();
    println!("cr = {}", cr);
}