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//! limitedclient: This example demonstrates usage of ClientConfig building
//! so that unused cryptography in rustls can be discarded by the linker. You can
//! observe using `nm` that the binary of this program does not contain any AES code.
use std::io::{Read, Write, stdout};
use std::net::TcpStream;
use std::sync::Arc;
use rustls::crypto::{CryptoProvider, ring as provider};
use rustls_native_certs::load_native_certs;
fn main() {
let mut root_store = rustls::RootCertStore::empty();
for cert in load_native_certs().expect("could not load platform certs") {
root_store.add(cert)
.expect("could not add certificate");
};
let config = rustls::ClientConfig::builder_with_provider(
CryptoProvider {
cipher_suites: vec![provider::cipher_suite::TLS13_CHACHA20_POLY1305_SHA256],
kx_groups: vec![provider::kx_group::X25519],
..provider::default_provider()
}
.into(),
)
.with_protocol_versions(&[&rustls::version::TLS13])
.unwrap()
.with_root_certificates(root_store)
.with_no_client_auth();
let server_name = "www.rust-lang.org".try_into().unwrap();
let mut conn = rustls::ClientConnection::new(Arc::new(config), server_name).unwrap();
let mut sock = TcpStream::connect("www.rust-lang.org:443").unwrap();
let mut tls = rustls::Stream::new(&mut conn, &mut sock);
tls.write_all(
concat!(
"GET / HTTP/1.1\r\n",
"Host: www.rust-lang.org\r\n",
"Connection: close\r\n",
"Accept-Encoding: identity\r\n",
"\r\n"
)
.as_bytes(),
)
.unwrap();
let ciphersuite = tls
.conn
.negotiated_cipher_suite()
.unwrap();
writeln!(
&mut std::io::stderr(),
"Current ciphersuite: {:?}",
ciphersuite.suite()
)
.unwrap();
let mut plaintext = Vec::new();
tls.read_to_end(&mut plaintext).unwrap();
stdout().write_all(&plaintext).unwrap();
}
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