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Chris Mahoney 3 months ago
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  1. 1
      .gitignore
  2. 603
      Cargo.lock
  3. 12
      Cargo.toml
  4. 93
      src/main.rs
  5. 54
      src/msqw.rs
  6. 32
      static/index.html
  7. 57
      static/index.js

1
.gitignore

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/target

603
Cargo.lock

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12
Cargo.toml

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[package]
name = "random"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
hyper = { version = "^0.14", features = ["full"] }
tokio = { version = "^1", features = ["full"] }
tokio-util = "^0.6.8"
pretty_env_logger = "0.4"

93
src/main.rs

@ -0,0 +1,93 @@
use std::sync::Arc;
use hyper::{Body, Method, Request, Response, Server, StatusCode, service::{make_service_fn, service_fn}};
use tokio::{fs::File, sync::Mutex};
use tokio_util::codec::{BytesCodec, FramedRead};
use crate::msqw::MSQW;
mod msqw;
type GenericError = Box<dyn std::error::Error + Send + Sync>;
type Result<T> = std::result::Result<T, GenericError>;
static NOTFOUND: &[u8] = b"Not Found";
async fn bits_api(
pool: Arc<Mutex<MSQW>>,
req: Request<Body>
) -> Result<Response<Body>> {
match (req.method(), req.uri().path()) {
(&Method::GET, "/") => simple_file_send("static/index.html").await,
(&Method::GET, "/index.js") => simple_file_send("static/index.js").await,
(&Method::GET, "/bits") => api_get_bits(pool).await,
(&Method::POST, "/zero") => api_post_zero(pool).await,
(&Method::POST, "/one") => api_post_one(pool).await,
_ => {
// Return 404 not found response.
Ok(not_found())
}
}
}
async fn api_get_bits(pool: Arc<Mutex<MSQW>>) -> Result<Response<Body>> {
// always return a u32
let bits = format!("{:032b}", pool.lock().await.update());
let response = Response::builder()
.status(200)
.header("Content-Type", "application/text")
.body(bits.into())
.unwrap();
Ok(response)
}
async fn api_post_zero(pool: Arc<Mutex<MSQW>>) -> Result<Response<Body>> {
pool.lock().await.add(false);
Ok(Response::new("OK".into()))
}
async fn api_post_one(pool: Arc<Mutex<MSQW>>) -> Result<Response<Body>> {
pool.lock().await.add(true);
Ok(Response::new("OK".into()))
}
async fn simple_file_send(filename: &str) -> Result<Response<Body>> {
// Serve a file by asynchronously reading it by chunks using tokio-util crate.
if let Ok(file) = File::open(filename).await {
let stream = FramedRead::new(file, BytesCodec::new());
let body = Body::wrap_stream(stream);
return Ok(Response::new(body));
}
Ok(not_found())
}
fn not_found() -> Response<Body> {
Response::builder()
.status(StatusCode::NOT_FOUND)
.body(NOTFOUND.into())
.unwrap()
}
#[tokio::main]
async fn main() {
let addr = ([127, 0, 0, 1], 3000).into();
let pool = Arc::new(Mutex::new(MSQW::new()));
let pool = &*Box::leak(Box::new(pool));
let service = make_service_fn(
move |_| async move {
Ok::<_, hyper::Error>(service_fn(move |req| bits_api(pool.clone(), req)))
});
let server = Server::bind(&addr).serve(service);
println!("Listening on http://{}", addr);
if let Err(e) = server.await {
eprintln!("server error: {}", e);
}
}

54
src/msqw.rs

@ -0,0 +1,54 @@
use std::num::Wrapping;
// An unremarkable odd number
const ODD: Wrapping<u64> = Wrapping(0x9f32e1cbc5e1374b);
pub(crate) struct MSQW {
reservoir: u64,
level: u8,
accumulator: Wrapping<u64>,
state: Wrapping<u64>,
}
impl MSQW {
pub fn new() -> Self {
Self { accumulator: Wrapping(0), state: Wrapping(0), reservoir: 0, level: 0 }
}
pub fn update(&mut self) -> u32 {
self.accumulator += ODD;
self.state += self.accumulator;
self.state = self.state * self.state;
self.state = Wrapping(self.state.0.rotate_left(32));
return self.state.0 as u32;
}
pub fn update_xor(&mut self) -> u32 {
self.accumulator += ODD;
self.state ^= self.accumulator;
self.state = self.state * self.state;
self.state = Wrapping(self.state.0.rotate_left(32));
return self.state.0 as u32;
}
pub fn mix(&mut self, randomness: u64) {
self.state ^= Wrapping(randomness);
self.update_xor();
}
pub fn add(&mut self, bit: bool) {
self.level += 1;
self.reservoir <<= 1;
if bit {
self.reservoir |= 1;
}
if self.level == 64 {
self.mix(self.reservoir);
self.level = 0;
}
}
}

32
static/index.html

@ -0,0 +1,32 @@
<html>
<head>
<meta charset="utf-8" />
<title>COSI Random</title>
</head>
<body class="content">
<h2>
Hello, welcome to COSI Random! Have a complementary bit:
<h3>
<div id="free_bit" style="height: 1em;"></div>
</h3>
</h2>
<h3>Add a bit to the entropy pool:</h3>
<button onClick="send(true)">One</button>
<button onClick="send(false)">Zero</button>
<h3>
Need a bit? Get one here:
<div id="bits" style="min-height: 1em;"></div>
</h3>
<button onClick="get_bit(1)">Get bit</button>
<button onClick="get_bits(10)">Get bit x10</button>
<button onClick="get_bits(100)">Get bit x100</button>
<button onClick="get_bits(1000)">Get bit x1000</button>
<script src="/index.js"></script>
</body>
</html>

57
static/index.js

@ -0,0 +1,57 @@
let bits = []
let free_bit = false;
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function get_bits(n) {
for (let i = 0; i < n; i++) {
get_bit();
await sleep(20);
}
}
function get_bit() {
let x;
if (bits.length == 0) {
if (x != undefined && x.readyState == XMLHttpRequest.OPENED) {
return;
}
x = new XMLHttpRequest();
x.onreadystatechange = () => {
if (x.readyState == XMLHttpRequest.DONE && x.status == 200) {
for (let bit of x.response) {
bits.push(bit);
}
if (!free_bit) {
document.getElementById("free_bit").innerHTML = bits.pop()
free_bit = true;
} else {
add_bit(bits.pop())
}
}
};
x.open('GET', "/bits");
x.responseType = "text";
x.setRequestHeader("Content-Type", "application/text");
x.send();
} else {
add_bit(bits.pop())
}
}
function add_bit(bit) {
document.getElementById("bits").innerHTML = document.getElementById("bits").innerHTML + " " + bit;
}
function send(bit) {
x = new XMLHttpRequest();
x.open('POST', bit ? "/one" : "/zero");
x.responseType = "text";
x.send();
}
get_bit();
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