mbedtls 0.13.6

Idiomatic Rust wrapper for MbedTLS, allowing you to use MbedTLS with only safe code while being able to use such great Rust features like error handling and closures. Building on MbedTLS's focus on embedded use, this crate can be used in a no_std environment.
Documentation 
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/* Copyright (c) Fortanix, Inc.
 *
 * Licensed under the GNU General Public License, version 2 <LICENSE-GPL or
 * https://www.gnu.org/licenses/gpl-2.0.html> or the Apache License, Version
 * 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>, at your
 * option. This file may not be copied, modified, or distributed except
 * according to those terms. */

// needed to have common code for `mod support` in unit and integrations tests
extern crate mbedtls;

use std::io::stdin;
use std::net::UdpSocket;
use std::sync::Arc;

use mbedtls::rng::CtrDrbg;
use mbedtls::ssl::config::{Endpoint, Preset, Transport};
use mbedtls::ssl::{Config, Context, Io};
use mbedtls::x509::Certificate;
use mbedtls::Result as TlsResult;

#[path = "../tests/support/mod.rs"]
mod support;
use support::entropy::entropy_new;
use support::keys;

fn result_main(addr: &str) -> TlsResult<()> {
    let entropy = Arc::new(entropy_new());
    let rng = Arc::new(CtrDrbg::new(entropy, None)?);
    let cert = Arc::new(Certificate::from_pem_multiple(keys::ROOT_CA_CERT.as_bytes())?);
    let mut config = Config::new(Endpoint::Client, Transport::Datagram, Preset::Default);
    config.set_rng(rng);
    config.set_ca_list(cert, None);
    let mut ctx = Context::new(Arc::new(config));
    ctx.set_timer_callback(Box::new(mbedtls::ssl::context::Timer::new()));

    let sock = UdpSocket::bind("localhost:12345").unwrap();
    let sock = mbedtls::ssl::io::ConnectedUdpSocket::connect(sock, addr).unwrap();
    ctx.establish(sock, None).unwrap();

    let mut line = String::new();
    stdin().read_line(&mut line).unwrap();
    ctx.send(line.as_bytes()).unwrap();
    let mut resp = Vec::with_capacity(100);
    let len = ctx.recv(&mut resp).unwrap();
    if let Ok(s) = std::str::from_utf8(&resp[..len]) {
        println!("{}", s);
    } else {
        eprintln!("Invalid UTF-8 received");
    }
    Ok(())
}

fn main() {
    let mut args = std::env::args();
    args.next();
    result_main(&args.next().expect("supply destination in command-line argument")).unwrap();
}