Crate embedded_tls

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Embedded-TLS

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Embedded-TLS is a Rust-native TLS 1.3 implementation that works in a no-std environment. The Rust crate was formerly known as drogue-tls. The implementation is work in progress, but the example clients should work against the rustls echo server.

The client supports both async and blocking modes. By default, the std feature is enabled, but can be disabled for bare metal usage.

To use the async mode, import embedded_tls::*. To use the blocking mode, import embedded_tls::blocking::*.

Some features and extensions are not yet implemented, have a look at open issues.

Only supports writing/receiving one frame at a time, hence using a frame buffer larger than 16k is not currently needed. You may use a lower frame buffer size, but there is no guarantee that it will be able to parse any TLS 1.3 frame.

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Example

use embedded_tls::*;
use embedded_io_adapters::tokio_1::FromTokio;
use rand::rngs::OsRng;
use tokio::net::TcpStream;

#[tokio::main]
async fn main() {
    let stream = TcpStream::connect("http.sandbox.drogue.cloud:443").await.expect("error creating TCP connection");

    println!("TCP connection opened");
    let mut read_record_buffer = [0; 16384];
    let mut write_record_buffer = [0; 16384];
    let config = TlsConfig::new()
        .with_server_name("http.sandbox.drogue.cloud");
    let mut tls: TlsConnection<FromTokio<TcpStream>, Aes128GcmSha256> =
        TlsConnection::new(FromTokio::new(stream), &mut read_record_buffer, &mut write_record_buffer);

    // Allows disabling cert verification, in case you are using PSK and don't need it, or are just testing.
    // otherwise, use embedded_tls::webpki::CertVerifier, which only works on std for now.
    tls.open::<OsRng, NoVerify>(TlsContext::new(&config, &mut OsRng)).await.expect("error establishing TLS connection");

    println!("TLS session opened");
}

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