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