fips203 0.4.3

FIPS 203: Module-Lattice-Based Key-Encapsulation Mechanism
Documentation 
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// This file implements a variety of top-level tests, including: official vectors, random
// round trips, and (soon) fails.

use rand_core::{CryptoRng, RngCore};

mod cctv_vectors;
mod nist_vectors;

// ----- CUSTOM RNG TO REPLAY VALUES -----

struct TestRng {
    data: Vec<Vec<u8>>,
}

impl RngCore for TestRng {
    fn next_u32(&mut self) -> u32 { unimplemented!() }

    fn next_u64(&mut self) -> u64 { unimplemented!() }

    fn fill_bytes(&mut self, out: &mut [u8]) {
        let x = self.data.pop().expect("TestRng problem");
        out.copy_from_slice(&x)
    }

    fn try_fill_bytes(&mut self, out: &mut [u8]) -> Result<(), rand_core::Error> {
        self.fill_bytes(out);
        Ok(()) // panic on probs is OK
    }
}

impl CryptoRng for TestRng {}

impl TestRng {
    fn new() -> Self { TestRng { data: Vec::new() } }

    fn push(&mut self, new_data: &[u8]) {
        let x = new_data.to_vec();
        self.data.push(x);
    }
}