Rust code shared from the playground

playground.rs

const _INPUT: &str = "1,2,4";
const INPUT: &str = "63,144,180,149,1,255,167,84,125,65,188,0,2,254,229,24";

const SIZE: usize = 256;
const ROUNDS: usize = 64;

fn main() {
    let mut circle: Vec<usize> = (0..SIZE).collect();
    let mut pos = 0;
    let mut skip_size = 0;
    
    for _ in 0..ROUNDS {
        for length in INPUT.bytes().chain(vec![17, 31, 73, 47, 23]) {
            let length = length as usize;
            for i in 0..length / 2 {
                circle.swap((pos + i) % SIZE, (pos + length - 1 - i) % SIZE);
            }
            
            pos += length + skip_size;
            skip_size += 1;
        }
    }
    
    let hash: String = circle
        .chunks(16)
        .map(|block| block.iter().fold(0, |x, &y| x ^ y))
        .map(|byte| format!("{:02x}", byte))
        .collect();
    
    println!("{}", hash);
}