ciph 0.1.0

Symmetric cipher layer for async read/write connections.
Documentation 
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//! Integration tests with the SalsaStream
use std::{
    io,
    thread,
    str::FromStr,
    net::SocketAddr,
    sync::mpsc,
};

use futures::TryFutureExt;
use tokio::{    
    io::{split, copy, AsyncWriteExt, AsyncReadExt},
    net::{TcpListener, TcpStream},
};

use ciph::salsa::{Psk, Acceptor, Connector, Randomness};

const PSK_B64: &str = include_str!("test.psk");

fn spawn_localhost_acceptor(psk: Psk, randomness: Randomness) -> SocketAddr {
    let (addr_send, addr_recv) = mpsc::channel();
    
    thread::spawn(move || {
        let rt = tokio::runtime::Builder::new_current_thread()
            .enable_io()
            .build()
            .unwrap();

        let handle = rt.handle().clone();
        let acceptor = Acceptor::new(psk, randomness);

        let server_fut = async move {
            let addr = SocketAddr::from(([127, 0, 0, 1], 0));
            let listener = TcpListener::bind(&addr).await?;

            let bound_addr = listener
                .local_addr()
                .unwrap();
            
            addr_send
                .send(bound_addr)
                .unwrap();

            loop {
                let (stream, _) = listener
                    .accept()
                    .await?;
                let establish = acceptor.accept(stream);
                
                let service_fut = async move {
                    let stream = establish.await?;
                    let (mut reader, mut writer) = split(stream);
                    copy(&mut reader, &mut writer).await?;

                    Ok(()) as io::Result<()>
                }
                .unwrap_or_else(|err| eprintln!("Server: {:?}", err));

                handle.spawn(service_fut);
            }
        }
        .unwrap_or_else(|err: io::Error| eprintln!("Server: {:?}", err));

        rt.block_on(server_fut);
    });

    addr_recv
        .recv()
        .unwrap()    
}

#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
async fn salsa_stream_cipher_works() {
    const FILE: &'static [u8] = include_bytes!("../README.md");
    let mut buffer: [u8; FILE.len()] = [0; FILE.len()];
    let psk = Psk::from_str(PSK_B64).unwrap();
    let addr = spawn_localhost_acceptor(psk.clone(), Randomness::Entropy);
    let tcp_stream = TcpStream::connect(&addr)
        .await
        .unwrap();
    let connector = Connector::new(psk, Randomness::Entropy);    
    let connect = connector.connect(tcp_stream);    
    let mut stream = connect
        .await
        .unwrap();

    stream
        .write_all(FILE)
        .await
        .unwrap();
    
    stream
        .flush()
        .await
        .unwrap();
    
    stream
        .read_exact(&mut buffer)
        .await
        .unwrap();

    assert_eq!(&buffer[..], FILE);   
}