sha2_constants.rs

// date: 2020-01-10
// update: 2024-03-31
// license: GPLv3 https://www.gnu.org/licenses/gpl-3.0.txt
// author: nanpuyue <[email protected]> https://blog.nanpuyue.com

#![feature(coroutines)]
#![feature(coroutine_trait)]

use std::ops::{Coroutine, CoroutineState};
use std::pin::Pin;

struct CoroutineIter<T: Coroutine + Unpin>(T);

impl<T: Coroutine + Unpin> Iterator for CoroutineIter<T> {
    type Item = <T as Coroutine>::Yield;

    fn next(&mut self) -> Option<Self::Item> {
        match Pin::new(&mut self.0).resume(()) {
            CoroutineState::Yielded(x) => Some(x),
            _ => None,
        }
    }
}

fn prime_generator() -> impl Coroutine<Yield = u16, Return = ()> {
    || {
        yield 2;
        yield 3;
        let mut n = 3u16;
        let mut l = vec![n];
        while let Some(x) = n.checked_add(2) {
            n = x;
            let mut y = true;
            for &i in &l {
                let (q, r) = (n / i, n % i);
                if i > q {
                    break;
                } else if r == 0 {
                    y = false;
                    break;
                }
            }
            if y {
                l.push(n);
                yield n;
            }
        }
    }
}

fn sha2_constant(root: f64) -> u32 {
    (root.fract() * (1u64 << 32) as f64) as u32
}

fn main() {
    for v in CoroutineIter(prime_generator()).take(8) {
        print!("{:#010x}, ", sha2_constant((v as f64).sqrt()));
    }
    println!("\n");

    for (i, v) in CoroutineIter(prime_generator()).take(64).enumerate() {
        print!("{:#010x}, ", sha2_constant((v as f64).cbrt()));
        if i % 8 == 7 {
            println!();
        }
    }
}

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