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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/incubator-teaclave-crates-c8106113f74feefc/ede1f68/rustls-0.19.1/rustls/src/server/hs.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>hs.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../rustls/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../rustls/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::error::TLSError;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;logging&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::log::{debug, trace};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::codec::Codec;
 <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{AlertDescription, ExtensionType};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{CipherSuite, Compression, ECPointFormat, NamedGroup};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{ClientCertificateType, SignatureScheme};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::enums::{ContentType, HandshakeType, ProtocolVersion};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::CertificateRequestPayload;
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::CertificateStatus;
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::ClientExtension;
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{ClientHelloPayload, ServerExtension, SessionID};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{ConvertProtocolNameList, ConvertServerNameList};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{DigitallySignedStruct, ServerECDHParams};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{ECDHEServerKeyExchange, ServerKeyExchangePayload};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{ECPointFormatList, SupportedPointFormats};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{HandshakeMessagePayload, Random, ServerHelloPayload};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::handshake::{HandshakePayload, SupportedSignatureSchemes};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::message::{Message, MessagePayload};
 <span class="kw">use </span><span class="kw">crate</span>::msgs::persist;
 <span class="kw">use </span><span class="kw">crate</span>::rand;
 <span class="kw">use </span><span class="kw">crate</span>::server::{ClientHello, ServerConfig, ServerSessionImpl};
 <span class="attribute">#[cfg(feature = <span class="string">&quot;quic&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::session::Protocol;
 <span class="kw">use </span><span class="kw">crate</span>::session::SessionSecrets;
 <span class="kw">use </span><span class="kw">crate</span>::sign;
 <span class="kw">use </span><span class="kw">crate</span>::suites;
 <span class="kw">use </span>webpki;

 <span class="kw">use </span><span class="kw">crate</span>::server::common::{HandshakeDetails, ServerKXDetails};
 <span class="kw">use </span><span class="kw">crate</span>::server::{tls12, tls13};

 <span class="kw">pub type </span>NextState = Box&lt;<span class="kw">dyn </span>State + Send + Sync&gt;;
 <span class="kw">pub type </span>NextStateOrError = <span class="prelude-ty">Result</span>&lt;NextState, TLSError&gt;;

 <span class="kw">pub trait </span>State {
     <span class="kw">fn </span>handle(<span class="self">self</span>: Box&lt;<span class="self">Self</span>&gt;, sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, m: Message) -&gt; NextStateOrError;

     <span class="kw">fn </span>export_keying_material(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         _output: <span class="kw-2">&amp;mut </span>[u8],
         _label: <span class="kw-2">&amp;</span>[u8],
         _context: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>[u8]&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), TLSError&gt; {
         <span class="prelude-val">Err</span>(TLSError::HandshakeNotComplete)
     }

     <span class="kw">fn </span>perhaps_write_key_update(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl) {}
 }

 <span class="kw">pub fn </span>incompatible(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, why: <span class="kw-2">&amp;</span>str) -&gt; TLSError {
     sess.common
         .send_fatal_alert(AlertDescription::HandshakeFailure);
     TLSError::PeerIncompatibleError(why.to_string())
 }

 <span class="kw">fn </span>bad_version(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, why: <span class="kw-2">&amp;</span>str) -&gt; TLSError {
     sess.common
         .send_fatal_alert(AlertDescription::ProtocolVersion);
     TLSError::PeerIncompatibleError(why.to_string())
 }

 <span class="kw">pub fn </span>illegal_param(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, why: <span class="kw-2">&amp;</span>str) -&gt; TLSError {
     sess.common
         .send_fatal_alert(AlertDescription::IllegalParameter);
     TLSError::PeerMisbehavedError(why.to_string())
 }

 <span class="kw">pub fn </span>decode_error(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, why: <span class="kw-2">&amp;</span>str) -&gt; TLSError {
     sess.common
         .send_fatal_alert(AlertDescription::DecodeError);
     TLSError::PeerMisbehavedError(why.to_string())
 }

 <span class="kw">pub fn </span>can_resume(
     sess: <span class="kw-2">&amp;</span>ServerSessionImpl,
     handshake: <span class="kw-2">&amp;</span>HandshakeDetails,
     resumedata: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;persist::ServerSessionValue&gt;,
 ) -&gt; bool {
     <span class="comment">// The RFCs underspecify what happens if we try to resume to
     // an unoffered/varying suite.  We merely don&#39;t resume in weird cases.
     //
     // RFC 6066 says &quot;A server that implements this extension MUST NOT accept
     // the request to resume the session if the server_name extension contains
     // a different name. Instead, it proceeds with a full handshake to
     // establish a new session.&quot;

     </span><span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>resume) = <span class="kw-2">*</span>resumedata {
         resume.cipher_suite == sess.common.get_suite_assert().suite
             &amp;&amp; (resume.extended_ms == handshake.using_ems
                 || (resume.extended_ms &amp;&amp; !handshake.using_ems))
             &amp;&amp; same_dns_name_or_both_none(resume.sni.as_ref(), sess.sni.as_ref())
     } <span class="kw">else </span>{
         <span class="bool-val">false
     </span>}
 }

 <span class="comment">// Require an exact match for the purpose of comparing SNI DNS Names from two
 // client hellos, even though a case-insensitive comparison might also be OK.
 </span><span class="kw">fn </span>same_dns_name_or_both_none(a: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>webpki::DNSName&gt;, b: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>webpki::DNSName&gt;) -&gt; bool {
     <span class="kw">match </span>(a, b) {
         (<span class="prelude-val">Some</span>(a), <span class="prelude-val">Some</span>(b)) =&gt; {
             <span class="kw">let </span>a: <span class="kw-2">&amp;</span>str = a.as_ref().into();
             <span class="kw">let </span>b: <span class="kw-2">&amp;</span>str = b.as_ref().into();
             a == b
         }
         (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; <span class="bool-val">true</span>,
         <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
     }
 }

 <span class="comment">// Changing the keys must not span any fragmented handshake
 // messages.  Otherwise the defragmented messages will have
 // been protected with two different record layer protections,
 // which is illegal.  Not mentioned in RFC.
 </span><span class="kw">pub fn </span>check_aligned_handshake(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl) -&gt; <span class="prelude-ty">Result</span>&lt;(), TLSError&gt; {
     <span class="kw">if </span>!sess.common.handshake_joiner.is_empty() {
         sess.common
             .send_fatal_alert(AlertDescription::UnexpectedMessage);
         <span class="prelude-val">Err</span>(TLSError::PeerMisbehavedError(
             <span class="string">&quot;key epoch or handshake flight with pending fragment&quot;</span>.to_string(),
         ))
     } <span class="kw">else </span>{
         <span class="prelude-val">Ok</span>(())
     }
 }

 <span class="kw">pub fn </span>save_sni(sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, sni: <span class="prelude-ty">Option</span>&lt;webpki::DNSName&gt;) {
     <span class="kw">if let </span><span class="prelude-val">Some</span>(sni) = sni {
         <span class="comment">// Save the SNI into the session.
         </span>sess.set_sni(sni);
     }
 }

 <span class="attribute">#[derive(Default)]
 </span><span class="kw">pub struct </span>ExtensionProcessing {
     <span class="comment">// extensions to reply with
     </span><span class="kw">pub </span>exts: Vec&lt;ServerExtension&gt;,

     <span class="comment">// effects on later handshake steps
     </span><span class="kw">pub </span>send_cert_status: bool,
     <span class="kw">pub </span>send_sct: bool,
     <span class="kw">pub </span>send_ticket: bool,
 }

 <span class="kw">impl </span>ExtensionProcessing {
     <span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
         Default::default()
     }

     <span class="kw">pub fn </span>process_common(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         server_key: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;mut </span>sign::CertifiedKey&gt;,
         hello: <span class="kw-2">&amp;</span>ClientHelloPayload,
         resumedata: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>persist::ServerSessionValue&gt;,
         handshake: <span class="kw-2">&amp;</span>HandshakeDetails,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), TLSError&gt; {
         <span class="comment">// ALPN
         </span><span class="kw">let </span>our_protocols = <span class="kw-2">&amp;</span>sess.config.alpn_protocols;
         <span class="kw">let </span>maybe_their_protocols = hello.get_alpn_extension();
         <span class="kw">if let </span><span class="prelude-val">Some</span>(their_protocols) = maybe_their_protocols {
             <span class="kw">let </span>their_protocols = their_protocols.to_slices();

             <span class="kw">if </span>their_protocols
                 .iter()
                 .any(|protocol| protocol.is_empty())
             {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerMisbehavedError(
                     <span class="string">&quot;client offered empty ALPN protocol&quot;</span>.to_string(),
                 ));
             }

             sess.alpn_protocol = our_protocols
                 .iter()
                 .filter(|protocol| their_protocols.contains(<span class="kw-2">&amp;</span>protocol.as_slice()))
                 .nth(<span class="number">0</span>)
                 .cloned();
             <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>selected_protocol) = sess.alpn_protocol {
                 <span class="macro">debug!</span>(<span class="string">&quot;Chosen ALPN protocol {:?}&quot;</span>, selected_protocol);
                 <span class="self">self</span>.exts
                     .push(ServerExtension::make_alpn(<span class="kw-2">&amp;</span>[selected_protocol]));
             } <span class="kw">else </span>{
                 <span class="comment">// For compatibility, strict ALPN validation is not employed unless targeting QUIC
                 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;quic&quot;</span>)]
                 </span>{
                     <span class="kw">if </span>sess.common.protocol == Protocol::Quic &amp;&amp; !our_protocols.is_empty() {
                         sess.common
                             .send_fatal_alert(AlertDescription::NoApplicationProtocol);
                         <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::NoApplicationProtocol);
                     }
                 }
             }
         }

         <span class="attribute">#[cfg(feature = <span class="string">&quot;quic&quot;</span>)]
         </span>{
             <span class="kw">if </span>sess.common.protocol == Protocol::Quic {
                 <span class="kw">if let </span><span class="prelude-val">Some</span>(params) = hello.get_quic_params_extension() {
                     sess.common.quic.params = <span class="prelude-val">Some</span>(params);
                 }

                 <span class="kw">if let </span><span class="prelude-val">Some</span>(resume) = resumedata {
                     <span class="kw">if </span>sess.config.max_early_data_size &gt; <span class="number">0
                         </span>&amp;&amp; hello.early_data_extension_offered()
                         &amp;&amp; resume.version == sess.common.negotiated_version.unwrap()
                         &amp;&amp; resume.cipher_suite == sess.common.get_suite_assert().suite
                         &amp;&amp; resume.alpn.as_ref().map(|x| <span class="kw-2">&amp;</span>x.<span class="number">0</span>) == sess.alpn_protocol.as_ref()
                         &amp;&amp; !sess.reject_early_data
                     {
                         <span class="self">self</span>.exts
                             .push(ServerExtension::EarlyData);
                     } <span class="kw">else </span>{
                         <span class="comment">// Clobber value set in tls13::emit_server_hello
                         </span>sess.common.quic.early_secret = <span class="prelude-val">None</span>;
                     }
                 }
             }
         }

         <span class="kw">let </span>for_resume = resumedata.is_some();
         <span class="comment">// SNI
         </span><span class="kw">if </span>!for_resume &amp;&amp; hello.get_sni_extension().is_some() {
             <span class="self">self</span>.exts
                 .push(ServerExtension::ServerNameAck);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(server_key) = server_key {
             <span class="comment">// Send status_request response if we have one.  This is not allowed
             // if we&#39;re resuming, and is only triggered if we have an OCSP response
             // to send.
             </span><span class="kw">if </span>!for_resume
                 &amp;&amp; hello
                     .find_extension(ExtensionType::StatusRequest)
                     .is_some()
                 &amp;&amp; server_key.has_ocsp()
             {
                 <span class="self">self</span>.send_cert_status = <span class="bool-val">true</span>;

                 <span class="kw">if </span>!sess.common.is_tls13() {
                     <span class="comment">// Only TLS1.2 sends confirmation in ServerHello
                     </span><span class="self">self</span>.exts
                         .push(ServerExtension::CertificateStatusAck);
                 }
             }

             <span class="kw">if </span>!for_resume
                 &amp;&amp; hello
                     .find_extension(ExtensionType::SCT)
                     .is_some()
                 &amp;&amp; server_key.has_sct_list()
             {
                 <span class="self">self</span>.send_sct = <span class="bool-val">true</span>;

                 <span class="kw">if </span>!sess.common.is_tls13() {
                     <span class="kw">let </span>sct_list = server_key.take_sct_list().unwrap();
                     <span class="self">self</span>.exts
                         .push(ServerExtension::make_sct(sct_list));
                 }
             }
         }

         <span class="kw">if </span>!sess.common.is_tls13() {}

         <span class="self">self</span>.exts
             .extend(handshake.extra_exts.iter().cloned());

         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>process_tls12(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;</span>ServerSessionImpl,
         hello: <span class="kw-2">&amp;</span>ClientHelloPayload,
         handshake: <span class="kw-2">&amp;</span>HandshakeDetails,
     ) {
         <span class="comment">// Renegotiation.
         // (We don&#39;t do reneg at all, but would support the secure version if we did.)
         </span><span class="kw">let </span>secure_reneg_offered = hello
             .find_extension(ExtensionType::RenegotiationInfo)
             .is_some()
             || hello
                 .cipher_suites
                 .contains(<span class="kw-2">&amp;</span>CipherSuite::TLS_EMPTY_RENEGOTIATION_INFO_SCSV);

         <span class="kw">if </span>secure_reneg_offered {
             <span class="self">self</span>.exts
                 .push(ServerExtension::make_empty_renegotiation_info());
         }

         <span class="comment">// Tickets:
         // If we get any SessionTicket extension and have tickets enabled,
         // we send an ack.
         </span><span class="kw">if </span>hello
             .find_extension(ExtensionType::SessionTicket)
             .is_some()
             &amp;&amp; sess.config.ticketer.enabled()
         {
             <span class="self">self</span>.send_ticket = <span class="bool-val">true</span>;
             <span class="self">self</span>.exts
                 .push(ServerExtension::SessionTicketAck);
         }

         <span class="comment">// Confirm use of EMS if offered.
         </span><span class="kw">if </span>handshake.using_ems {
             <span class="self">self</span>.exts
                 .push(ServerExtension::ExtendedMasterSecretAck);
         }
     }
 }

 <span class="kw">pub struct </span>ExpectClientHello {
     <span class="kw">pub </span>handshake: HandshakeDetails,
     <span class="kw">pub </span>done_retry: bool,
     <span class="kw">pub </span>send_cert_status: bool,
     <span class="kw">pub </span>send_sct: bool,
     <span class="kw">pub </span>send_ticket: bool,
 }

 <span class="kw">impl </span>ExpectClientHello {
     <span class="kw">pub fn </span>new(
         server_config: <span class="kw-2">&amp;</span>ServerConfig,
         extra_exts: Vec&lt;ServerExtension&gt;,
     ) -&gt; ExpectClientHello {
         <span class="kw">let </span><span class="kw-2">mut </span>ech = ExpectClientHello {
             handshake: HandshakeDetails::new(extra_exts),
             done_retry: <span class="bool-val">false</span>,
             send_cert_status: <span class="bool-val">false</span>,
             send_sct: <span class="bool-val">false</span>,
             send_ticket: <span class="bool-val">false</span>,
         };

         <span class="kw">if </span>server_config
             .verifier
             .offer_client_auth()
         {
             ech.handshake
                 .transcript
                 .set_client_auth_enabled();
         }

         ech
     }

     <span class="kw">fn </span>into_expect_tls12_ccs(<span class="self">self</span>, secrets: SessionSecrets) -&gt; NextState {
         Box::new(tls12::ExpectCCS {
             secrets,
             handshake: <span class="self">self</span>.handshake,
             resuming: <span class="bool-val">true</span>,
             send_ticket: <span class="self">self</span>.send_ticket,
         })
     }

     <span class="kw">fn </span>into_complete_tls13_client_hello_handling(<span class="self">self</span>) -&gt; tls13::CompleteClientHelloHandling {
         tls13::CompleteClientHelloHandling {
             handshake: <span class="self">self</span>.handshake,
             done_retry: <span class="self">self</span>.done_retry,
             send_cert_status: <span class="self">self</span>.send_cert_status,
             send_sct: <span class="self">self</span>.send_sct,
             send_ticket: <span class="self">self</span>.send_ticket,
         }
     }

     <span class="kw">fn </span>into_expect_tls12_certificate(<span class="self">self</span>, kx: suites::KeyExchange) -&gt; NextState {
         Box::new(tls12::ExpectCertificate {
             handshake: <span class="self">self</span>.handshake,
             server_kx: ServerKXDetails::new(kx),
             send_ticket: <span class="self">self</span>.send_ticket,
         })
     }

     <span class="kw">fn </span>into_expect_tls12_client_kx(<span class="self">self</span>, kx: suites::KeyExchange) -&gt; NextState {
         Box::new(tls12::ExpectClientKX {
             handshake: <span class="self">self</span>.handshake,
             server_kx: ServerKXDetails::new(kx),
             client_cert: <span class="prelude-val">None</span>,
             send_ticket: <span class="self">self</span>.send_ticket,
         })
     }

     <span class="kw">fn </span>emit_server_hello(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         server_key: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;mut </span>sign::CertifiedKey&gt;,
         hello: <span class="kw-2">&amp;</span>ClientHelloPayload,
         resumedata: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>persist::ServerSessionValue&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(), TLSError&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>ep = ExtensionProcessing::new();
         ep.process_common(sess, server_key, hello, resumedata, <span class="kw-2">&amp;</span><span class="self">self</span>.handshake)<span class="question-mark">?</span>;
         ep.process_tls12(sess, hello, <span class="kw-2">&amp;</span><span class="self">self</span>.handshake);

         <span class="self">self</span>.send_ticket = ep.send_ticket;
         <span class="self">self</span>.send_cert_status = ep.send_cert_status;
         <span class="self">self</span>.send_sct = ep.send_sct;

         <span class="kw">let </span>sh = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::ServerHello,
                 payload: HandshakePayload::ServerHello(ServerHelloPayload {
                     legacy_version: ProtocolVersion::TLSv1_2,
                     random: Random::from_slice(<span class="kw-2">&amp;</span><span class="self">self</span>.handshake.randoms.server),
                     session_id: <span class="self">self</span>.handshake.session_id,
                     cipher_suite: sess.common.get_suite_assert().suite,
                     compression_method: Compression::Null,
                     extensions: ep.exts,
                 }),
             }),
         };

         <span class="macro">trace!</span>(<span class="string">&quot;sending server hello {:?}&quot;</span>, sh);
         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>sh);
         sess.common.send_msg(sh, <span class="bool-val">false</span>);
         <span class="prelude-val">Ok</span>(())
     }

     <span class="kw">fn </span>emit_certificate(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         server_certkey: <span class="kw-2">&amp;mut </span>sign::CertifiedKey,
     ) {
         <span class="kw">let </span>cert_chain = server_certkey.take_cert();

         <span class="kw">let </span>c = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::Certificate,
                 payload: HandshakePayload::Certificate(cert_chain),
             }),
         };

         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>c);
         sess.common.send_msg(c, <span class="bool-val">false</span>);
     }

     <span class="kw">fn </span>emit_cert_status(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         server_certkey: <span class="kw-2">&amp;mut </span>sign::CertifiedKey,
     ) {
         <span class="kw">if </span>!<span class="self">self</span>.send_cert_status || !server_certkey.has_ocsp() {
             <span class="kw">return</span>;
         }

         <span class="kw">let </span>ocsp = server_certkey.take_ocsp();
         <span class="kw">let </span>st = CertificateStatus::new(ocsp.unwrap());

         <span class="kw">let </span>c = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::CertificateStatus,
                 payload: HandshakePayload::CertificateStatus(st),
             }),
         };

         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>c);
         sess.common.send_msg(c, <span class="bool-val">false</span>);
     }

     <span class="kw">fn </span>emit_server_kx(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         sigschemes: Vec&lt;SignatureScheme&gt;,
         group: NamedGroup,
         server_certkey: <span class="kw-2">&amp;mut </span>sign::CertifiedKey,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;suites::KeyExchange, TLSError&gt; {
         <span class="kw">let </span>kx = sess
             .common
             .get_suite_assert()
             .start_server_kx(group)
             .ok_or_else(|| TLSError::PeerMisbehavedError(<span class="string">&quot;key exchange failed&quot;</span>.to_string()))<span class="question-mark">?</span>;
         <span class="kw">let </span>secdh = ServerECDHParams::new(group, kx.pubkey.as_ref());

         <span class="kw">let </span><span class="kw-2">mut </span>msg = Vec::new();
         msg.extend(<span class="kw-2">&amp;</span><span class="self">self</span>.handshake.randoms.client);
         msg.extend(<span class="kw-2">&amp;</span><span class="self">self</span>.handshake.randoms.server);
         secdh.encode(<span class="kw-2">&amp;mut </span>msg);

         <span class="kw">let </span>signing_key = <span class="kw-2">&amp;</span>server_certkey.key;
         <span class="kw">let </span>signer = signing_key
             .choose_scheme(<span class="kw-2">&amp;</span>sigschemes)
             .ok_or_else(|| TLSError::General(<span class="string">&quot;incompatible signing key&quot;</span>.to_string()))<span class="question-mark">?</span>;
         <span class="kw">let </span>sigscheme = signer.get_scheme();
         <span class="kw">let </span>sig = signer.sign(<span class="kw-2">&amp;</span>msg)<span class="question-mark">?</span>;

         <span class="kw">let </span>skx = ServerKeyExchangePayload::ECDHE(ECDHEServerKeyExchange {
             params: secdh,
             dss: DigitallySignedStruct::new(sigscheme, sig),
         });

         <span class="kw">let </span>m = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::ServerKeyExchange,
                 payload: HandshakePayload::ServerKeyExchange(skx),
             }),
         };

         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>m);
         sess.common.send_msg(m, <span class="bool-val">false</span>);
         <span class="prelude-val">Ok</span>(kx)
     }

     <span class="kw">fn </span>emit_certificate_req(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl) -&gt; <span class="prelude-ty">Result</span>&lt;bool, TLSError&gt; {
         <span class="kw">let </span>client_auth = sess.config.get_verifier();

         <span class="kw">if </span>!client_auth.offer_client_auth() {
             <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
         }

         <span class="kw">let </span>verify_schemes = client_auth.supported_verify_schemes();

         <span class="kw">let </span>names = client_auth
             .client_auth_root_subjects(sess.get_sni())
             .ok_or_else(|| {
                 <span class="macro">debug!</span>(<span class="string">&quot;could not determine root subjects based on SNI&quot;</span>);
                 sess.common
                     .send_fatal_alert(AlertDescription::AccessDenied);
                 TLSError::General(<span class="string">&quot;client rejected by client_auth_root_subjects&quot;</span>.into())
             })<span class="question-mark">?</span>;

         <span class="kw">let </span>cr = CertificateRequestPayload {
             certtypes: <span class="macro">vec!</span>[
                 ClientCertificateType::RSASign,
                 ClientCertificateType::ECDSASign,
             ],
             sigschemes: verify_schemes,
             canames: names,
         };

         <span class="kw">let </span>m = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::CertificateRequest,
                 payload: HandshakePayload::CertificateRequest(cr),
             }),
         };

         <span class="macro">trace!</span>(<span class="string">&quot;Sending CertificateRequest {:?}&quot;</span>, m);
         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>m);
         sess.common.send_msg(m, <span class="bool-val">false</span>);
         <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
     }

     <span class="kw">fn </span>emit_server_hello_done(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl) {
         <span class="kw">let </span>m = Message {
             typ: ContentType::Handshake,
             version: ProtocolVersion::TLSv1_2,
             payload: MessagePayload::Handshake(HandshakeMessagePayload {
                 typ: HandshakeType::ServerHelloDone,
                 payload: HandshakePayload::ServerHelloDone,
             }),
         };

         <span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>m);
         sess.common.send_msg(m, <span class="bool-val">false</span>);
     }

     <span class="kw">fn </span>start_resumption(
         <span class="kw-2">mut </span><span class="self">self</span>,
         sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl,
         client_hello: <span class="kw-2">&amp;</span>ClientHelloPayload,
         sni: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>webpki::DNSName&gt;,
         id: <span class="kw-2">&amp;</span>SessionID,
         resumedata: persist::ServerSessionValue,
     ) -&gt; NextStateOrError {
         <span class="macro">debug!</span>(<span class="string">&quot;Resuming session&quot;</span>);

         <span class="kw">if </span>resumedata.extended_ms &amp;&amp; !<span class="self">self</span>.handshake.using_ems {
             <span class="kw">return </span><span class="prelude-val">Err</span>(illegal_param(sess, <span class="string">&quot;refusing to resume without ems&quot;</span>));
         }

         <span class="self">self</span>.handshake.session_id = <span class="kw-2">*</span>id;
         <span class="self">self</span>.emit_server_hello(sess, <span class="prelude-val">None</span>, client_hello, <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>resumedata))<span class="question-mark">?</span>;

         <span class="kw">let </span>hashalg = sess
             .common
             .get_suite_assert()
             .get_hash();
         <span class="kw">let </span>secrets = SessionSecrets::new_resume(
             <span class="kw-2">&amp;</span><span class="self">self</span>.handshake.randoms,
             hashalg,
             <span class="kw-2">&amp;</span>resumedata.master_secret.<span class="number">0</span>,
         );
         sess.config.key_log.log(
             <span class="string">&quot;CLIENT_RANDOM&quot;</span>,
             <span class="kw-2">&amp;</span>secrets.randoms.client,
             <span class="kw-2">&amp;</span>secrets.master_secret,
         );
         sess.common
             .start_encryption_tls12(<span class="kw-2">&amp;</span>secrets);
         sess.client_cert_chain = resumedata.client_cert_chain;

         <span class="kw">if </span><span class="self">self</span>.send_ticket {
             tls12::emit_ticket(<span class="kw-2">&amp;</span>secrets, <span class="kw-2">&amp;mut </span><span class="self">self</span>.handshake, sess);
         }
         tls12::emit_ccs(sess);
         sess.common
             .record_layer
             .start_encrypting();
         tls12::emit_finished(<span class="kw-2">&amp;</span>secrets, <span class="kw-2">&amp;mut </span><span class="self">self</span>.handshake, sess);

         <span class="macro">assert!</span>(same_dns_name_or_both_none(sni, sess.get_sni()));

         <span class="prelude-val">Ok</span>(<span class="self">self</span>.into_expect_tls12_ccs(secrets))
     }
 }

 <span class="kw">impl </span>State <span class="kw">for </span>ExpectClientHello {
     <span class="kw">fn </span>handle(<span class="kw-2">mut </span><span class="self">self</span>: Box&lt;<span class="self">Self</span>&gt;, sess: <span class="kw-2">&amp;mut </span>ServerSessionImpl, m: Message) -&gt; NextStateOrError {
         <span class="kw">let </span>client_hello =
             <span class="macro">require_handshake_msg!</span>(m, HandshakeType::ClientHello, HandshakePayload::ClientHello)<span class="question-mark">?</span>;
         <span class="kw">let </span>tls13_enabled = sess
             .config
             .supports_version(ProtocolVersion::TLSv1_3);
         <span class="kw">let </span>tls12_enabled = sess
             .config
             .supports_version(ProtocolVersion::TLSv1_2);
         <span class="macro">trace!</span>(<span class="string">&quot;we got a clienthello {:?}&quot;</span>, client_hello);

         <span class="kw">if </span>!client_hello
             .compression_methods
             .contains(<span class="kw-2">&amp;</span>Compression::Null)
         {
             sess.common
                 .send_fatal_alert(AlertDescription::IllegalParameter);
             <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerIncompatibleError(
                 <span class="string">&quot;client did not offer Null compression&quot;</span>.to_string(),
             ));
         }

         <span class="kw">if </span>client_hello.has_duplicate_extension() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(decode_error(sess, <span class="string">&quot;client sent duplicate extensions&quot;</span>));
         }

         <span class="comment">// No handshake messages should follow this one in this flight.
         </span>check_aligned_handshake(sess)<span class="question-mark">?</span>;

         <span class="comment">// Are we doing TLS1.3?
         </span><span class="kw">let </span>maybe_versions_ext = client_hello.get_versions_extension();
         <span class="kw">if let </span><span class="prelude-val">Some</span>(versions) = maybe_versions_ext {
             <span class="kw">if </span>versions.contains(<span class="kw-2">&amp;</span>ProtocolVersion::TLSv1_3) &amp;&amp; tls13_enabled {
                 sess.common.negotiated_version = <span class="prelude-val">Some</span>(ProtocolVersion::TLSv1_3);
             } <span class="kw">else if </span>!versions.contains(<span class="kw-2">&amp;</span>ProtocolVersion::TLSv1_2) || !tls12_enabled {
                 <span class="kw">return </span><span class="prelude-val">Err</span>(bad_version(sess, <span class="string">&quot;TLS1.2 not offered/enabled&quot;</span>));
             }
         } <span class="kw">else if </span>client_hello.client_version.get_u16() &lt; ProtocolVersion::TLSv1_2.get_u16() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(bad_version(sess, <span class="string">&quot;Client does not support TLSv1_2&quot;</span>));
         } <span class="kw">else if </span>!tls12_enabled &amp;&amp; tls13_enabled {
             <span class="kw">return </span><span class="prelude-val">Err</span>(bad_version(
                 sess,
                 <span class="string">&quot;Server requires TLS1.3, but client omitted versions ext&quot;</span>,
             ));
         }

         <span class="kw">if </span>sess.common.negotiated_version == <span class="prelude-val">None </span>{
             sess.common.negotiated_version = <span class="prelude-val">Some</span>(ProtocolVersion::TLSv1_2);
         }

         <span class="comment">// --- Common to TLS1.2 and TLS1.3: ciphersuite and certificate selection.

         // Extract and validate the SNI DNS name, if any, before giving it to
         // the cert resolver. In particular, if it is invalid then we should
         // send an Illegal Parameter alert instead of the Internal Error alert
         // (or whatever) that we&#39;d send if this were checked later or in a
         // different way.
         </span><span class="kw">let </span>sni: <span class="prelude-ty">Option</span>&lt;webpki::DNSName&gt; = <span class="kw">match </span>client_hello.get_sni_extension() {
             <span class="prelude-val">Some</span>(sni) =&gt; {
                 <span class="kw">if </span>sni.has_duplicate_names_for_type() {
                     <span class="kw">return </span><span class="prelude-val">Err</span>(decode_error(
                         sess,
                         <span class="string">&quot;ClientHello SNI contains duplicate name types&quot;</span>,
                     ));
                 }

                 <span class="kw">if let </span><span class="prelude-val">Some</span>(hostname) = sni.get_single_hostname() {
                     <span class="prelude-val">Some</span>(hostname.into())
                 } <span class="kw">else </span>{
                     <span class="kw">return </span><span class="prelude-val">Err</span>(illegal_param(
                         sess,
                         <span class="string">&quot;ClientHello SNI did not contain a hostname&quot;</span>,
                     ));
                 }
             }
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">None</span>,
         };

         <span class="kw">if </span>!<span class="self">self</span>.done_retry {
             <span class="comment">// save only the first SNI
             </span>save_sni(sess, sni.clone());
         }

         <span class="comment">// We communicate to the upper layer what kind of key they should choose
         // via the sigschemes value.  Clients tend to treat this extension
         // orthogonally to offered ciphersuites (even though, in TLS1.2 it is not).
         // So: reduce the offered sigschemes to those compatible with the
         // intersection of ciphersuites.
         </span><span class="kw">let </span><span class="kw-2">mut </span>common_suites = sess.config.ciphersuites.clone();
         common_suites.retain(|scs| {
             client_hello
                 .cipher_suites
                 .contains(<span class="kw-2">&amp;</span>scs.suite)
         });

         <span class="kw">let </span><span class="kw-2">mut </span>sigschemes_ext = client_hello
             .get_sigalgs_extension()
             .cloned()
             .unwrap_or_else(SupportedSignatureSchemes::default);
         sigschemes_ext
             .retain(|scheme| suites::compatible_sigscheme_for_suites(<span class="kw-2">*</span>scheme, <span class="kw-2">&amp;</span>common_suites));

         <span class="kw">let </span>alpn_protocols = client_hello
             .get_alpn_extension()
             .map(|protos| protos.to_slices());

         <span class="comment">// Choose a certificate.
         </span><span class="kw">let </span><span class="kw-2">mut </span>certkey = {
             <span class="kw">let </span>sni_ref = sni
                 .as_ref()
                 .map(webpki::DNSName::as_ref);
             <span class="macro">trace!</span>(<span class="string">&quot;sni {:?}&quot;</span>, sni_ref);
             <span class="macro">trace!</span>(<span class="string">&quot;sig schemes {:?}&quot;</span>, sigschemes_ext);
             <span class="macro">trace!</span>(<span class="string">&quot;alpn protocols {:?}&quot;</span>, alpn_protocols);

             <span class="kw">let </span>alpn_slices = <span class="kw">match </span>alpn_protocols {
                 <span class="prelude-val">Some</span>(<span class="kw-2">ref </span>vec) =&gt; <span class="prelude-val">Some</span>(vec.as_slice()),
                 <span class="prelude-val">None </span>=&gt; <span class="prelude-val">None</span>,
             };

             <span class="kw">let </span>client_hello = ClientHello::new(sni_ref, <span class="kw-2">&amp;</span>sigschemes_ext, alpn_slices);

             <span class="kw">let </span>certkey = sess
                 .config
                 .cert_resolver
                 .resolve(client_hello);
             certkey.ok_or_else(|| {
                 sess.common
                     .send_fatal_alert(AlertDescription::AccessDenied);
                 TLSError::General(<span class="string">&quot;no server certificate chain resolved&quot;</span>.to_string())
             })<span class="question-mark">?
         </span>};

         <span class="comment">// Reduce our supported ciphersuites by the certificate.
         // (no-op for TLS1.3)
         </span><span class="kw">let </span>suitable_suites =
             suites::reduce_given_sigalg(<span class="kw-2">&amp;</span>sess.config.ciphersuites, certkey.key.algorithm());

         <span class="comment">// And version
         </span><span class="kw">let </span>protocol_version = sess.common.negotiated_version.unwrap();
         <span class="kw">let </span>suitable_suites = suites::reduce_given_version(<span class="kw-2">&amp;</span>suitable_suites, protocol_version);

         <span class="kw">let </span>maybe_ciphersuite = <span class="kw">if </span>sess.config.ignore_client_order {
             suites::choose_ciphersuite_preferring_server(
                 <span class="kw-2">&amp;</span>client_hello.cipher_suites,
                 <span class="kw-2">&amp;</span>suitable_suites,
             )
         } <span class="kw">else </span>{
             suites::choose_ciphersuite_preferring_client(
                 <span class="kw-2">&amp;</span>client_hello.cipher_suites,
                 <span class="kw-2">&amp;</span>suitable_suites,
             )
         };

         <span class="kw">if </span>maybe_ciphersuite.is_none() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(incompatible(sess, <span class="string">&quot;no ciphersuites in common&quot;</span>));
         }

         <span class="macro">debug!</span>(
             <span class="string">&quot;decided upon suite {:?}&quot;</span>,
             maybe_ciphersuite.as_ref().unwrap()
         );
         sess.common
             .set_suite(maybe_ciphersuite.unwrap());

         <span class="comment">// Start handshake hash.
         </span><span class="kw">let </span>starting_hash = sess
             .common
             .get_suite_assert()
             .get_hash();
         <span class="kw">if </span>!<span class="self">self
             </span>.handshake
             .transcript
             .start_hash(starting_hash)
         {
             sess.common
                 .send_fatal_alert(AlertDescription::IllegalParameter);
             <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerIncompatibleError(
                 <span class="string">&quot;hash differed on retry&quot;</span>.to_string(),
             ));
         }

         <span class="comment">// Save their Random.
         </span>client_hello
             .random
             .write_slice(<span class="kw-2">&amp;mut </span><span class="self">self</span>.handshake.randoms.client);

         <span class="kw">if </span>sess.common.is_tls13() {
             <span class="kw">return </span><span class="self">self
                 </span>.into_complete_tls13_client_hello_handling()
                 .handle_client_hello(sess, certkey, <span class="kw-2">&amp;</span>m);
         }

         <span class="comment">// -- TLS1.2 only from hereon in --
         </span><span class="self">self</span>.handshake
             .transcript
             .add_message(<span class="kw-2">&amp;</span>m);

         <span class="kw">if </span>client_hello.ems_support_offered() {
             <span class="self">self</span>.handshake.using_ems = <span class="bool-val">true</span>;
         }

         <span class="kw">let </span>groups_ext = client_hello
             .get_namedgroups_extension()
             .ok_or_else(|| incompatible(sess, <span class="string">&quot;client didn&#39;t describe groups&quot;</span>))<span class="question-mark">?</span>;
         <span class="kw">let </span>ecpoints_ext = client_hello
             .get_ecpoints_extension()
             .ok_or_else(|| incompatible(sess, <span class="string">&quot;client didn&#39;t describe ec points&quot;</span>))<span class="question-mark">?</span>;

         <span class="macro">trace!</span>(<span class="string">&quot;namedgroups {:?}&quot;</span>, groups_ext);
         <span class="macro">trace!</span>(<span class="string">&quot;ecpoints {:?}&quot;</span>, ecpoints_ext);

         <span class="kw">if </span>!ecpoints_ext.contains(<span class="kw-2">&amp;</span>ECPointFormat::Uncompressed) {
             sess.common
                 .send_fatal_alert(AlertDescription::IllegalParameter);
             <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerIncompatibleError(
                 <span class="string">&quot;client didn&#39;t support uncompressed ec points&quot;</span>.to_string(),
             ));
         }

         <span class="comment">// -- If TLS1.3 is enabled, signal the downgrade in the server random
         </span><span class="kw">if </span>tls13_enabled {
             <span class="self">self</span>.handshake
                 .randoms
                 .set_tls12_downgrade_marker();
         }

         <span class="comment">// -- Check for resumption --
         // We can do this either by (in order of preference):
         // 1. receiving a ticket that decrypts
         // 2. receiving a sessionid that is in our cache
         //
         // If we receive a ticket, the sessionid won&#39;t be in our
         // cache, so don&#39;t check.
         //
         // If either works, we end up with a ServerSessionValue
         // which is passed to start_resumption and concludes
         // our handling of the ClientHello.
         //
         </span><span class="kw">let </span><span class="kw-2">mut </span>ticket_received = <span class="bool-val">false</span>;

         <span class="kw">if let </span><span class="prelude-val">Some</span>(ticket_ext) = client_hello.get_ticket_extension() {
             <span class="kw">if let </span>ClientExtension::SessionTicketOffer(<span class="kw-2">ref </span>ticket) = <span class="kw-2">*</span>ticket_ext {
                 ticket_received = <span class="bool-val">true</span>;
                 <span class="macro">debug!</span>(<span class="string">&quot;Ticket received&quot;</span>);

                 <span class="kw">let </span>maybe_resume = sess
                     .config
                     .ticketer
                     .decrypt(<span class="kw-2">&amp;</span>ticket.<span class="number">0</span>)
                     .and_then(|plain| persist::ServerSessionValue::read_bytes(<span class="kw-2">&amp;</span>plain));

                 <span class="kw">if </span>can_resume(sess, <span class="kw-2">&amp;</span><span class="self">self</span>.handshake, <span class="kw-2">&amp;</span>maybe_resume) {
                     <span class="kw">return </span><span class="self">self</span>.start_resumption(
                         sess,
                         client_hello,
                         sni.as_ref(),
                         <span class="kw-2">&amp;</span>client_hello.session_id,
                         maybe_resume.unwrap(),
                     );
                 } <span class="kw">else </span>{
                     <span class="macro">debug!</span>(<span class="string">&quot;Ticket didn&#39;t decrypt&quot;</span>);
                 }
             }
         }

         <span class="comment">// If we&#39;re not offered a ticket or a potential session ID,
         // allocate a session ID.
         </span><span class="kw">if </span><span class="self">self</span>.handshake.session_id.is_empty() &amp;&amp; !ticket_received {
             <span class="kw">let </span><span class="kw-2">mut </span>bytes = [<span class="number">0u8</span>; <span class="number">32</span>];
             rand::fill_random(<span class="kw-2">&amp;mut </span>bytes);
             <span class="self">self</span>.handshake.session_id = SessionID::new(<span class="kw-2">&amp;</span>bytes);
         }

         <span class="comment">// Perhaps resume?  If we received a ticket, the sessionid
         // does not correspond to a real session.
         </span><span class="kw">if </span>!client_hello.session_id.is_empty() &amp;&amp; !ticket_received {
             <span class="kw">let </span>maybe_resume = sess
                 .config
                 .session_storage
                 .get(<span class="kw-2">&amp;</span>client_hello.session_id.get_encoding())
                 .and_then(|x| persist::ServerSessionValue::read_bytes(<span class="kw-2">&amp;</span>x));

             <span class="kw">if </span>can_resume(sess, <span class="kw-2">&amp;</span><span class="self">self</span>.handshake, <span class="kw-2">&amp;</span>maybe_resume) {
                 <span class="kw">return </span><span class="self">self</span>.start_resumption(
                     sess,
                     client_hello,
                     sni.as_ref(),
                     <span class="kw-2">&amp;</span>client_hello.session_id,
                     maybe_resume.unwrap(),
                 );
             }
         }

         <span class="comment">// Now we have chosen a ciphersuite, we can make kx decisions.
         </span><span class="kw">let </span>sigschemes = sess
             .common
             .get_suite_assert()
             .resolve_sig_schemes(<span class="kw-2">&amp;</span>sigschemes_ext);

         <span class="kw">if </span>sigschemes.is_empty() {
             <span class="kw">return </span><span class="prelude-val">Err</span>(incompatible(sess, <span class="string">&quot;no supported sig scheme&quot;</span>));
         }

         <span class="kw">let </span>group = suites::KeyExchange::supported_groups()
             .iter()
             .filter(|group| groups_ext.contains(group))
             .nth(<span class="number">0</span>)
             .cloned()
             .ok_or_else(|| incompatible(sess, <span class="string">&quot;no supported group&quot;</span>))<span class="question-mark">?</span>;

         <span class="kw">let </span>ecpoint = ECPointFormatList::supported()
             .iter()
             .filter(|format| ecpoints_ext.contains(format))
             .nth(<span class="number">0</span>)
             .cloned()
             .ok_or_else(|| incompatible(sess, <span class="string">&quot;no supported point format&quot;</span>))<span class="question-mark">?</span>;

         <span class="macro">debug_assert_eq!</span>(ecpoint, ECPointFormat::Uncompressed);

         <span class="self">self</span>.emit_server_hello(sess, <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>certkey), client_hello, <span class="prelude-val">None</span>)<span class="question-mark">?</span>;
         <span class="self">self</span>.emit_certificate(sess, <span class="kw-2">&amp;mut </span>certkey);
         <span class="self">self</span>.emit_cert_status(sess, <span class="kw-2">&amp;mut </span>certkey);
         <span class="kw">let </span>kx = <span class="self">self</span>.emit_server_kx(sess, sigschemes, group, <span class="kw-2">&amp;mut </span>certkey)<span class="question-mark">?</span>;
         <span class="kw">let </span>doing_client_auth = <span class="self">self</span>.emit_certificate_req(sess)<span class="question-mark">?</span>;
         <span class="self">self</span>.emit_server_hello_done(sess);

         <span class="kw">if </span>doing_client_auth {
             <span class="prelude-val">Ok</span>(<span class="self">self</span>.into_expect_tls12_certificate(kx))
         } <span class="kw">else </span>{
             <span class="prelude-val">Ok</span>(<span class="self">self</span>.into_expect_tls12_client_kx(kx))
         }
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rustls" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>