openssl-ktls 0.2.3

Openssl KTLS support (with tokio)
Documentation 
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# openssl-ktls
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[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://raw.githubusercontent.com/youyuanwu/rust-openssl-ktls/main/LICENSE)
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[![Documentation](https://docs.rs/openssl-ktls/badge.svg)](https://docs.rs/openssl-ktls)

Use openssl with [kernel TLS offload](https://www.kernel.org/doc/html/latest/networking/tls-offload.html), optionally with tokio.

This crate implements sync SslStream and async tokio SslStream that are ktls capable, extending the [openssl](https://crates.io/crates/openssl) crate.

## Get started
Add to Cargo.toml
```toml
openssl-ktls = { version = "*", default-features = false, features = ["tokio", "vendored"]}
```
* feature `tokio` enables tokio based async SslStream.
* feature `vendored` enableds build openssl from source with ktls enabled. If your system openssl is already built with ktls enabled, you can skip this feature.

## Examples
SslStream works the same way as `openssl::ssl::SslStream`.
```rs
let mut connector =
    openssl::ssl::SslConnector::builder(openssl::ssl::SslMethod::tls()).unwrap();
let connector = connector.set_options(openssl_ktls::option::SSL_OP_ENABLE_KTLS)
    .set_cipher_list(openssl_ktls::option::ECDHE_RSA_AES128_GCM_SHA256).unwrap()
    .configure().unwrap();
let ssl = connector.into_ssl("localhost").unwrap();
let tcp_stream = tokio::net::TcpStream::connect("localhost:8080").await.unwrap();
let mut ssl_stream = openssl_ktls::TokioSslStream::new(tcp_stream, ssl).unwrap();
// read and write data on ssl_stream...
// check ktls is used.
let receive_enabled = ssl_s.ktls_recv_enabled();
let send_enabled = ssl_s.ktls_send_enabled();
```

# License
This project is licensed under the MIT license.