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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/registry/src/github.com-1ecc6299db9ec823/rustls-0.19.1/src/cipher.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cipher.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="kw">use </span><span class="kw">crate</span>::key_schedule::{derive_traffic_iv, derive_traffic_key};
<span class="kw">use </span><span class="kw">crate</span>::msgs::codec;
<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::{ContentType, ProtocolVersion};
<span class="kw">use </span><span class="kw">crate</span>::msgs::fragmenter::MAX_FRAGMENT_LEN;
<span class="kw">use </span><span class="kw">crate</span>::msgs::message::{BorrowMessage, Message, MessagePayload};
<span class="kw">use </span><span class="kw">crate</span>::session::SessionSecrets;
<span class="kw">use </span><span class="kw">crate</span>::suites::SupportedCipherSuite;
<span class="kw">use </span>ring::{aead, hkdf};
<span class="kw">use </span>std::io::Write;
<span class="doccomment">/// Objects with this trait can decrypt TLS messages.
</span><span class="kw">pub trait </span>MessageDecrypter: Send + Sync {
<span class="kw">fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, m: Message, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt;;
}
<span class="doccomment">/// Objects with this trait can encrypt TLS messages.
</span><span class="kw">pub trait </span>MessageEncrypter: Send + Sync {
<span class="kw">fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, m: BorrowMessage, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt;;
}
<span class="kw">impl dyn </span>MessageEncrypter {
<span class="kw">pub fn </span>invalid() -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt; {
Box::new(InvalidMessageEncrypter {})
}
}
<span class="kw">impl dyn </span>MessageDecrypter {
<span class="kw">pub fn </span>invalid() -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt; {
Box::new(InvalidMessageDecrypter {})
}
}
<span class="kw">pub type </span>MessageCipherPair = (Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt;, Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt;);
<span class="kw">const </span>TLS12_AAD_SIZE: usize = <span class="number">8 </span>+ <span class="number">1 </span>+ <span class="number">2 </span>+ <span class="number">2</span>;
<span class="kw">fn </span>make_tls12_aad(
seq: u64,
typ: ContentType,
vers: ProtocolVersion,
len: usize,
) -&gt; ring::aead::Aad&lt;[u8; TLS12_AAD_SIZE]&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>out = [<span class="number">0</span>; TLS12_AAD_SIZE];
codec::put_u64(seq, <span class="kw-2">&amp;mut </span>out[<span class="number">0</span>..]);
out[<span class="number">8</span>] = typ.get_u8();
codec::put_u16(vers.get_u16(), <span class="kw-2">&amp;mut </span>out[<span class="number">9</span>..]);
codec::put_u16(len <span class="kw">as </span>u16, <span class="kw-2">&amp;mut </span>out[<span class="number">11</span>..]);
ring::aead::Aad::from(out)
}
<span class="kw">fn </span>make_tls12_gcm_nonce(write_iv: <span class="kw-2">&amp;</span>[u8], explicit: <span class="kw-2">&amp;</span>[u8]) -&gt; Iv {
<span class="macro">debug_assert_eq!</span>(write_iv.len(), <span class="number">4</span>);
<span class="macro">debug_assert_eq!</span>(explicit.len(), <span class="number">8</span>);
<span class="comment">// The GCM nonce is constructed from a 32-bit &#39;salt&#39; derived
// from the master-secret, and a 64-bit explicit part,
// with no specified construction. Thanks for that.
//
// We use the same construction as TLS1.3/ChaCha20Poly1305:
// a starting point extracted from the key block, xored with
// the sequence number.
</span><span class="kw">let </span><span class="kw-2">mut </span>iv = Iv(Default::default());
iv.<span class="number">0</span>[..<span class="number">4</span>].copy_from_slice(write_iv);
iv.<span class="number">0</span>[<span class="number">4</span>..].copy_from_slice(explicit);
iv
}
<span class="kw">pub type </span>BuildTLS12Decrypter = <span class="kw">fn</span>(<span class="kw-2">&amp;</span>[u8], <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt;;
<span class="kw">pub type </span>BuildTLS12Encrypter = <span class="kw">fn</span>(<span class="kw-2">&amp;</span>[u8], <span class="kw-2">&amp;</span>[u8], <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt;;
<span class="kw">pub fn </span>build_tls12_gcm_128_decrypter(key: <span class="kw-2">&amp;</span>[u8], iv: <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt; {
Box::new(GCMMessageDecrypter::new(<span class="kw-2">&amp;</span>aead::AES_128_GCM, key, iv))
}
<span class="kw">pub fn </span>build_tls12_gcm_128_encrypter(
key: <span class="kw-2">&amp;</span>[u8],
iv: <span class="kw-2">&amp;</span>[u8],
extra: <span class="kw-2">&amp;</span>[u8],
) -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt; {
<span class="kw">let </span>nonce = make_tls12_gcm_nonce(iv, extra);
Box::new(GCMMessageEncrypter::new(<span class="kw-2">&amp;</span>aead::AES_128_GCM, key, nonce))
}
<span class="kw">pub fn </span>build_tls12_gcm_256_decrypter(key: <span class="kw-2">&amp;</span>[u8], iv: <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt; {
Box::new(GCMMessageDecrypter::new(<span class="kw-2">&amp;</span>aead::AES_256_GCM, key, iv))
}
<span class="kw">pub fn </span>build_tls12_gcm_256_encrypter(
key: <span class="kw-2">&amp;</span>[u8],
iv: <span class="kw-2">&amp;</span>[u8],
extra: <span class="kw-2">&amp;</span>[u8],
) -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt; {
<span class="kw">let </span>nonce = make_tls12_gcm_nonce(iv, extra);
Box::new(GCMMessageEncrypter::new(<span class="kw-2">&amp;</span>aead::AES_256_GCM, key, nonce))
}
<span class="kw">pub fn </span>build_tls12_chacha_decrypter(key: <span class="kw-2">&amp;</span>[u8], iv: <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt; {
Box::new(ChaCha20Poly1305MessageDecrypter::new(
<span class="kw-2">&amp;</span>aead::CHACHA20_POLY1305,
key,
Iv::copy(iv),
))
}
<span class="kw">pub fn </span>build_tls12_chacha_encrypter(key: <span class="kw-2">&amp;</span>[u8], iv: <span class="kw-2">&amp;</span>[u8], <span class="kw">_</span>: <span class="kw-2">&amp;</span>[u8]) -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt; {
Box::new(ChaCha20Poly1305MessageEncrypter::new(
<span class="kw-2">&amp;</span>aead::CHACHA20_POLY1305,
key,
Iv::copy(iv),
))
}
<span class="doccomment">/// Make a `MessageCipherPair` based on the given supported ciphersuite `scs`,
/// and the session&#39;s `secrets`.
</span><span class="kw">pub fn </span>new_tls12(
scs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>SupportedCipherSuite,
secrets: <span class="kw-2">&amp;</span>SessionSecrets,
) -&gt; MessageCipherPair {
<span class="comment">// Make a key block, and chop it up.
// nb. we don&#39;t implement any ciphersuites with nonzero mac_key_len.
</span><span class="kw">let </span>key_block = secrets.make_key_block(scs.key_block_len());
<span class="kw">let </span><span class="kw-2">mut </span>offs = <span class="number">0</span>;
<span class="kw">let </span>client_write_key = <span class="kw-2">&amp;</span>key_block[offs..offs + scs.enc_key_len];
offs += scs.enc_key_len;
<span class="kw">let </span>server_write_key = <span class="kw-2">&amp;</span>key_block[offs..offs + scs.enc_key_len];
offs += scs.enc_key_len;
<span class="kw">let </span>client_write_iv = <span class="kw-2">&amp;</span>key_block[offs..offs + scs.fixed_iv_len];
offs += scs.fixed_iv_len;
<span class="kw">let </span>server_write_iv = <span class="kw-2">&amp;</span>key_block[offs..offs + scs.fixed_iv_len];
offs += scs.fixed_iv_len;
<span class="kw">let </span>(write_key, write_iv) = <span class="kw">if </span>secrets.randoms.we_are_client {
(client_write_key, client_write_iv)
} <span class="kw">else </span>{
(server_write_key, server_write_iv)
};
<span class="kw">let </span>(read_key, read_iv) = <span class="kw">if </span>secrets.randoms.we_are_client {
(server_write_key, server_write_iv)
} <span class="kw">else </span>{
(client_write_key, client_write_iv)
};
(
scs.build_tls12_decrypter.unwrap()(read_key, read_iv),
scs.build_tls12_encrypter.unwrap()(write_key, write_iv, <span class="kw-2">&amp;</span>key_block[offs..]),
)
}
<span class="kw">pub fn </span>new_tls13_read(
scs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>SupportedCipherSuite,
secret: <span class="kw-2">&amp;</span>hkdf::Prk,
) -&gt; Box&lt;<span class="kw">dyn </span>MessageDecrypter&gt; {
<span class="kw">let </span>key = derive_traffic_key(secret, scs.aead_algorithm);
<span class="kw">let </span>iv = derive_traffic_iv(secret);
Box::new(TLS13MessageDecrypter::new(key, iv))
}
<span class="kw">pub fn </span>new_tls13_write(
scs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>SupportedCipherSuite,
secret: <span class="kw-2">&amp;</span>hkdf::Prk,
) -&gt; Box&lt;<span class="kw">dyn </span>MessageEncrypter&gt; {
<span class="kw">let </span>key = derive_traffic_key(secret, scs.aead_algorithm);
<span class="kw">let </span>iv = derive_traffic_iv(secret);
Box::new(TLS13MessageEncrypter::new(key, iv))
}
<span class="doccomment">/// A `MessageEncrypter` for AES-GCM AEAD ciphersuites. TLS 1.2 only.
</span><span class="kw">pub struct </span>GCMMessageEncrypter {
enc_key: aead::LessSafeKey,
iv: Iv,
}
<span class="doccomment">/// A `MessageDecrypter` for AES-GCM AEAD ciphersuites. TLS1.2 only.
</span><span class="kw">pub struct </span>GCMMessageDecrypter {
dec_key: aead::LessSafeKey,
dec_salt: [u8; <span class="number">4</span>],
}
<span class="kw">const </span>GCM_EXPLICIT_NONCE_LEN: usize = <span class="number">8</span>;
<span class="kw">const </span>GCM_OVERHEAD: usize = GCM_EXPLICIT_NONCE_LEN + <span class="number">16</span>;
<span class="kw">impl </span>MessageDecrypter <span class="kw">for </span>GCMMessageDecrypter {
<span class="kw">fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>payload = msg
.take_opaque_payload()
.ok_or(TLSError::DecryptError)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>buf = payload.<span class="number">0</span>;
<span class="kw">if </span>buf.len() &lt; GCM_OVERHEAD {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::DecryptError);
}
<span class="kw">let </span>nonce = {
<span class="kw">let </span><span class="kw-2">mut </span>nonce = [<span class="number">0u8</span>; <span class="number">12</span>];
nonce
.as_mut()
.write_all(<span class="kw-2">&amp;</span><span class="self">self</span>.dec_salt)
.unwrap();
nonce[<span class="number">4</span>..]
.as_mut()
.write_all(<span class="kw-2">&amp;</span>buf[..<span class="number">8</span>])
.unwrap();
aead::Nonce::assume_unique_for_key(nonce)
};
<span class="kw">let </span>aad = make_tls12_aad(seq, msg.typ, msg.version, buf.len() - GCM_OVERHEAD);
<span class="kw">let </span>plain_len = <span class="self">self
</span>.dec_key
.open_within(nonce, aad, <span class="kw-2">&amp;mut </span>buf, GCM_EXPLICIT_NONCE_LEN..)
.map_err(|<span class="kw">_</span>| TLSError::DecryptError)<span class="question-mark">?
</span>.len();
<span class="kw">if </span>plain_len &gt; MAX_FRAGMENT_LEN {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerSentOversizedRecord);
}
buf.truncate(plain_len);
<span class="prelude-val">Ok</span>(Message {
typ: msg.typ,
version: msg.version,
payload: MessagePayload::new_opaque(buf),
})
}
}
<span class="kw">impl </span>MessageEncrypter <span class="kw">for </span>GCMMessageEncrypter {
<span class="kw">fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.iv, seq);
<span class="kw">let </span>aad = make_tls12_aad(seq, msg.typ, msg.version, msg.payload.len());
<span class="kw">let </span>total_len = msg.payload.len() + <span class="self">self</span>.enc_key.algorithm().tag_len();
<span class="kw">let </span><span class="kw-2">mut </span>payload = Vec::with_capacity(GCM_EXPLICIT_NONCE_LEN + total_len);
payload.extend_from_slice(<span class="kw-2">&amp;</span>nonce.as_ref()[<span class="number">4</span>..]);
payload.extend_from_slice(<span class="kw-2">&amp;</span>msg.payload);
<span class="self">self</span>.enc_key
.seal_in_place_separate_tag(nonce, aad, <span class="kw-2">&amp;mut </span>payload[GCM_EXPLICIT_NONCE_LEN..])
.map(|tag| payload.extend(tag.as_ref()))
.map_err(|<span class="kw">_</span>| TLSError::General(<span class="string">&quot;encrypt failed&quot;</span>.to_string()))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Message {
typ: msg.typ,
version: msg.version,
payload: MessagePayload::new_opaque(payload),
})
}
}
<span class="kw">impl </span>GCMMessageEncrypter {
<span class="kw">fn </span>new(alg: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>aead::Algorithm, enc_key: <span class="kw-2">&amp;</span>[u8], iv: Iv) -&gt; GCMMessageEncrypter {
<span class="kw">let </span>key = aead::UnboundKey::new(alg, enc_key).unwrap();
GCMMessageEncrypter {
enc_key: aead::LessSafeKey::new(key),
iv,
}
}
}
<span class="kw">impl </span>GCMMessageDecrypter {
<span class="kw">fn </span>new(alg: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>aead::Algorithm, dec_key: <span class="kw-2">&amp;</span>[u8], dec_iv: <span class="kw-2">&amp;</span>[u8]) -&gt; GCMMessageDecrypter {
<span class="kw">let </span>key = aead::UnboundKey::new(alg, dec_key).unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>ret = GCMMessageDecrypter {
dec_key: aead::LessSafeKey::new(key),
dec_salt: [<span class="number">0u8</span>; <span class="number">4</span>],
};
<span class="macro">debug_assert_eq!</span>(dec_iv.len(), <span class="number">4</span>);
ret.dec_salt
.as_mut()
.write_all(dec_iv)
.unwrap();
ret
}
}
<span class="doccomment">/// A TLS 1.3 write or read IV.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Iv([u8; ring::aead::NONCE_LEN]);
<span class="kw">impl </span>Iv {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(value: [u8; ring::aead::NONCE_LEN]) -&gt; <span class="self">Self </span>{
<span class="self">Self</span>(value)
}
<span class="kw">fn </span>copy(value: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="self">Self </span>{
<span class="macro">debug_assert_eq!</span>(value.len(), ring::aead::NONCE_LEN);
<span class="kw">let </span><span class="kw-2">mut </span>iv = Iv::new(Default::default());
iv.<span class="number">0</span>.copy_from_slice(value);
iv
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>value(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8; <span class="number">12</span>] {
<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0
</span>}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>IvLen;
<span class="kw">impl </span>hkdf::KeyType <span class="kw">for </span>IvLen {
<span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
aead::NONCE_LEN
}
}
<span class="kw">impl </span>From&lt;hkdf::Okm&lt;<span class="lifetime">&#39;_</span>, IvLen&gt;&gt; <span class="kw">for </span>Iv {
<span class="kw">fn </span>from(okm: hkdf::Okm&lt;IvLen&gt;) -&gt; <span class="self">Self </span>{
<span class="kw">let </span><span class="kw-2">mut </span>r = Iv(Default::default());
okm.fill(<span class="kw-2">&amp;mut </span>r.<span class="number">0</span>[..]).unwrap();
r
}
}
<span class="kw">struct </span>TLS13MessageEncrypter {
enc_key: aead::LessSafeKey,
iv: Iv,
}
<span class="kw">struct </span>TLS13MessageDecrypter {
dec_key: aead::LessSafeKey,
iv: Iv,
}
<span class="kw">fn </span>unpad_tls13(v: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) -&gt; ContentType {
<span class="kw">loop </span>{
<span class="kw">match </span>v.pop() {
<span class="prelude-val">Some</span>(<span class="number">0</span>) =&gt; {}
<span class="prelude-val">Some</span>(content_type) =&gt; <span class="kw">return </span>ContentType::read_bytes(<span class="kw-2">&amp;</span>[content_type]).unwrap(),
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span>ContentType::Unknown(<span class="number">0</span>),
}
}
}
<span class="kw">fn </span>make_tls13_nonce(iv: <span class="kw-2">&amp;</span>Iv, seq: u64) -&gt; ring::aead::Nonce {
<span class="kw">let </span><span class="kw-2">mut </span>nonce = [<span class="number">0u8</span>; ring::aead::NONCE_LEN];
codec::put_u64(seq, <span class="kw-2">&amp;mut </span>nonce[<span class="number">4</span>..]);
nonce
.iter_mut()
.zip(iv.<span class="number">0</span>.iter())
.for_each(|(nonce, iv)| {
<span class="kw-2">*</span>nonce ^= <span class="kw-2">*</span>iv;
});
aead::Nonce::assume_unique_for_key(nonce)
}
<span class="kw">fn </span>make_tls13_aad(len: usize) -&gt; ring::aead::Aad&lt;[u8; <span class="number">1 </span>+ <span class="number">2 </span>+ <span class="number">2</span>]&gt; {
ring::aead::Aad::from([
<span class="number">0x17</span>, <span class="comment">// ContentType::ApplicationData
</span><span class="number">0x3</span>, <span class="comment">// ProtocolVersion (major)
</span><span class="number">0x3</span>, <span class="comment">// ProtocolVersion (minor)
</span>(len &gt;&gt; <span class="number">8</span>) <span class="kw">as </span>u8,
len <span class="kw">as </span>u8,
])
}
<span class="kw">impl </span>MessageEncrypter <span class="kw">for </span>TLS13MessageEncrypter {
<span class="kw">fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>total_len = msg.payload.len() + <span class="number">1 </span>+ <span class="self">self</span>.enc_key.algorithm().tag_len();
<span class="kw">let </span><span class="kw-2">mut </span>buf = Vec::with_capacity(total_len);
buf.extend_from_slice(<span class="kw-2">&amp;</span>msg.payload);
msg.typ.encode(<span class="kw-2">&amp;mut </span>buf);
<span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.iv, seq);
<span class="kw">let </span>aad = make_tls13_aad(total_len);
<span class="self">self</span>.enc_key
.seal_in_place_append_tag(nonce, aad, <span class="kw-2">&amp;mut </span>buf)
.map_err(|<span class="kw">_</span>| TLSError::General(<span class="string">&quot;encrypt failed&quot;</span>.to_string()))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Message {
typ: ContentType::ApplicationData,
version: ProtocolVersion::TLSv1_2,
payload: MessagePayload::new_opaque(buf),
})
}
}
<span class="kw">impl </span>MessageDecrypter <span class="kw">for </span>TLS13MessageDecrypter {
<span class="kw">fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>payload = msg
.take_opaque_payload()
.ok_or(TLSError::DecryptError)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>buf = payload.<span class="number">0</span>;
<span class="kw">if </span>buf.len() &lt; <span class="self">self</span>.dec_key.algorithm().tag_len() {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::DecryptError);
}
<span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.iv, seq);
<span class="kw">let </span>aad = make_tls13_aad(buf.len());
<span class="kw">let </span>plain_len = <span class="self">self
</span>.dec_key
.open_in_place(nonce, aad, <span class="kw-2">&amp;mut </span>buf)
.map_err(|<span class="kw">_</span>| TLSError::DecryptError)<span class="question-mark">?
</span>.len();
buf.truncate(plain_len);
<span class="kw">if </span>buf.len() &gt; MAX_FRAGMENT_LEN + <span class="number">1 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerSentOversizedRecord);
}
<span class="kw">let </span>content_type = unpad_tls13(<span class="kw-2">&amp;mut </span>buf);
<span class="kw">if </span>content_type == ContentType::Unknown(<span class="number">0</span>) {
<span class="kw">let </span>msg = <span class="string">&quot;peer sent bad TLSInnerPlaintext&quot;</span>.to_string();
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerMisbehavedError(msg));
}
<span class="kw">if </span>buf.len() &gt; MAX_FRAGMENT_LEN {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerSentOversizedRecord);
}
<span class="prelude-val">Ok</span>(Message {
typ: content_type,
version: ProtocolVersion::TLSv1_3,
payload: MessagePayload::new_opaque(buf),
})
}
}
<span class="kw">impl </span>TLS13MessageEncrypter {
<span class="kw">fn </span>new(key: aead::UnboundKey, enc_iv: Iv) -&gt; TLS13MessageEncrypter {
TLS13MessageEncrypter {
enc_key: aead::LessSafeKey::new(key),
iv: enc_iv,
}
}
}
<span class="kw">impl </span>TLS13MessageDecrypter {
<span class="kw">fn </span>new(key: aead::UnboundKey, dec_iv: Iv) -&gt; TLS13MessageDecrypter {
TLS13MessageDecrypter {
dec_key: aead::LessSafeKey::new(key),
iv: dec_iv,
}
}
}
<span class="doccomment">/// The RFC7905/RFC7539 ChaCha20Poly1305 construction.
/// This implementation does the AAD construction required in TLS1.2.
/// TLS1.3 uses `TLS13MessageEncrypter`.
</span><span class="kw">pub struct </span>ChaCha20Poly1305MessageEncrypter {
enc_key: aead::LessSafeKey,
enc_offset: Iv,
}
<span class="doccomment">/// The RFC7905/RFC7539 ChaCha20Poly1305 construction.
/// This implementation does the AAD construction required in TLS1.2.
/// TLS1.3 uses `TLS13MessageDecrypter`.
</span><span class="kw">pub struct </span>ChaCha20Poly1305MessageDecrypter {
dec_key: aead::LessSafeKey,
dec_offset: Iv,
}
<span class="kw">impl </span>ChaCha20Poly1305MessageEncrypter {
<span class="kw">fn </span>new(
alg: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>aead::Algorithm,
enc_key: <span class="kw-2">&amp;</span>[u8],
enc_iv: Iv,
) -&gt; ChaCha20Poly1305MessageEncrypter {
<span class="kw">let </span>key = aead::UnboundKey::new(alg, enc_key).unwrap();
ChaCha20Poly1305MessageEncrypter {
enc_key: aead::LessSafeKey::new(key),
enc_offset: enc_iv,
}
}
}
<span class="kw">impl </span>ChaCha20Poly1305MessageDecrypter {
<span class="kw">fn </span>new(
alg: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>aead::Algorithm,
dec_key: <span class="kw-2">&amp;</span>[u8],
dec_iv: Iv,
) -&gt; ChaCha20Poly1305MessageDecrypter {
<span class="kw">let </span>key = aead::UnboundKey::new(alg, dec_key).unwrap();
ChaCha20Poly1305MessageDecrypter {
dec_key: aead::LessSafeKey::new(key),
dec_offset: dec_iv,
}
}
}
<span class="kw">const </span>CHACHAPOLY1305_OVERHEAD: usize = <span class="number">16</span>;
<span class="kw">impl </span>MessageDecrypter <span class="kw">for </span>ChaCha20Poly1305MessageDecrypter {
<span class="kw">fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>payload = msg
.take_opaque_payload()
.ok_or(TLSError::DecryptError)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>buf = payload.<span class="number">0</span>;
<span class="kw">if </span>buf.len() &lt; CHACHAPOLY1305_OVERHEAD {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::DecryptError);
}
<span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.dec_offset, seq);
<span class="kw">let </span>aad = make_tls12_aad(
seq,
msg.typ,
msg.version,
buf.len() - CHACHAPOLY1305_OVERHEAD,
);
<span class="kw">let </span>plain_len = <span class="self">self
</span>.dec_key
.open_in_place(nonce, aad, <span class="kw-2">&amp;mut </span>buf)
.map_err(|<span class="kw">_</span>| TLSError::DecryptError)<span class="question-mark">?
</span>.len();
<span class="kw">if </span>plain_len &gt; MAX_FRAGMENT_LEN {
<span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerSentOversizedRecord);
}
buf.truncate(plain_len);
<span class="prelude-val">Ok</span>(Message {
typ: msg.typ,
version: msg.version,
payload: MessagePayload::new_opaque(buf),
})
}
}
<span class="kw">impl </span>MessageEncrypter <span class="kw">for </span>ChaCha20Poly1305MessageEncrypter {
<span class="kw">fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&amp;</span><span class="self">self</span>.enc_offset, seq);
<span class="kw">let </span>aad = make_tls12_aad(seq, msg.typ, msg.version, msg.payload.len());
<span class="kw">let </span>total_len = msg.payload.len() + <span class="self">self</span>.enc_key.algorithm().tag_len();
<span class="kw">let </span><span class="kw-2">mut </span>buf = Vec::with_capacity(total_len);
buf.extend_from_slice(<span class="kw-2">&amp;</span>msg.payload);
<span class="self">self</span>.enc_key
.seal_in_place_append_tag(nonce, aad, <span class="kw-2">&amp;mut </span>buf)
.map_err(|<span class="kw">_</span>| TLSError::General(<span class="string">&quot;encrypt failed&quot;</span>.to_string()))<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Message {
typ: msg.typ,
version: msg.version,
payload: MessagePayload::new_opaque(buf),
})
}
}
<span class="doccomment">/// A `MessageEncrypter` which doesn&#39;t work.
</span><span class="kw">pub struct </span>InvalidMessageEncrypter {}
<span class="kw">impl </span>MessageEncrypter <span class="kw">for </span>InvalidMessageEncrypter {
<span class="kw">fn </span>encrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, _m: BorrowMessage, _seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="prelude-val">Err</span>(TLSError::General(<span class="string">&quot;encrypt not yet available&quot;</span>.to_string()))
}
}
<span class="doccomment">/// A `MessageDecrypter` which doesn&#39;t work.
</span><span class="kw">pub struct </span>InvalidMessageDecrypter {}
<span class="kw">impl </span>MessageDecrypter <span class="kw">for </span>InvalidMessageDecrypter {
<span class="kw">fn </span>decrypt(<span class="kw-2">&amp;</span><span class="self">self</span>, _m: Message, _seq: u64) -&gt; <span class="prelude-ty">Result</span>&lt;Message, TLSError&gt; {
<span class="prelude-val">Err</span>(TLSError::DecryptError)
}
}
</code></pre></div>
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