| <!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/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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| <span id="536">536</span> |
| <span id="537">537</span> |
| <span id="538">538</span> |
| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
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| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
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| <span id="551">551</span> |
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| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| </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">&</span><span class="self">self</span>, m: Message, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError>; |
| } |
| |
| <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">&</span><span class="self">self</span>, m: BorrowMessage, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError>; |
| } |
| |
| <span class="kw">impl dyn </span>MessageEncrypter { |
| <span class="kw">pub fn </span>invalid() -> Box<<span class="kw">dyn </span>MessageEncrypter> { |
| Box::new(InvalidMessageEncrypter {}) |
| } |
| } |
| |
| <span class="kw">impl dyn </span>MessageDecrypter { |
| <span class="kw">pub fn </span>invalid() -> Box<<span class="kw">dyn </span>MessageDecrypter> { |
| Box::new(InvalidMessageDecrypter {}) |
| } |
| } |
| |
| <span class="kw">pub type </span>MessageCipherPair = (Box<<span class="kw">dyn </span>MessageDecrypter>, Box<<span class="kw">dyn </span>MessageEncrypter>); |
| |
| <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, |
| ) -> ring::aead::Aad<[u8; TLS12_AAD_SIZE]> { |
| <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">&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">&mut </span>out[<span class="number">9</span>..]); |
| codec::put_u16(len <span class="kw">as </span>u16, <span class="kw-2">&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">&</span>[u8], explicit: <span class="kw-2">&</span>[u8]) -> 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 'salt' 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">&</span>[u8], <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageDecrypter>; |
| <span class="kw">pub type </span>BuildTLS12Encrypter = <span class="kw">fn</span>(<span class="kw-2">&</span>[u8], <span class="kw-2">&</span>[u8], <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageEncrypter>; |
| |
| <span class="kw">pub fn </span>build_tls12_gcm_128_decrypter(key: <span class="kw-2">&</span>[u8], iv: <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageDecrypter> { |
| Box::new(GCMMessageDecrypter::new(<span class="kw-2">&</span>aead::AES_128_GCM, key, iv)) |
| } |
| |
| <span class="kw">pub fn </span>build_tls12_gcm_128_encrypter( |
| key: <span class="kw-2">&</span>[u8], |
| iv: <span class="kw-2">&</span>[u8], |
| extra: <span class="kw-2">&</span>[u8], |
| ) -> Box<<span class="kw">dyn </span>MessageEncrypter> { |
| <span class="kw">let </span>nonce = make_tls12_gcm_nonce(iv, extra); |
| Box::new(GCMMessageEncrypter::new(<span class="kw-2">&</span>aead::AES_128_GCM, key, nonce)) |
| } |
| |
| <span class="kw">pub fn </span>build_tls12_gcm_256_decrypter(key: <span class="kw-2">&</span>[u8], iv: <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageDecrypter> { |
| Box::new(GCMMessageDecrypter::new(<span class="kw-2">&</span>aead::AES_256_GCM, key, iv)) |
| } |
| |
| <span class="kw">pub fn </span>build_tls12_gcm_256_encrypter( |
| key: <span class="kw-2">&</span>[u8], |
| iv: <span class="kw-2">&</span>[u8], |
| extra: <span class="kw-2">&</span>[u8], |
| ) -> Box<<span class="kw">dyn </span>MessageEncrypter> { |
| <span class="kw">let </span>nonce = make_tls12_gcm_nonce(iv, extra); |
| Box::new(GCMMessageEncrypter::new(<span class="kw-2">&</span>aead::AES_256_GCM, key, nonce)) |
| } |
| |
| <span class="kw">pub fn </span>build_tls12_chacha_decrypter(key: <span class="kw-2">&</span>[u8], iv: <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageDecrypter> { |
| Box::new(ChaCha20Poly1305MessageDecrypter::new( |
| <span class="kw-2">&</span>aead::CHACHA20_POLY1305, |
| key, |
| Iv::copy(iv), |
| )) |
| } |
| |
| <span class="kw">pub fn </span>build_tls12_chacha_encrypter(key: <span class="kw-2">&</span>[u8], iv: <span class="kw-2">&</span>[u8], <span class="kw">_</span>: <span class="kw-2">&</span>[u8]) -> Box<<span class="kw">dyn </span>MessageEncrypter> { |
| Box::new(ChaCha20Poly1305MessageEncrypter::new( |
| <span class="kw-2">&</span>aead::CHACHA20_POLY1305, |
| key, |
| Iv::copy(iv), |
| )) |
| } |
| |
| <span class="doccomment">/// Make a `MessageCipherPair` based on the given supported ciphersuite `scs`, |
| /// and the session's `secrets`. |
| </span><span class="kw">pub fn </span>new_tls12( |
| scs: <span class="kw-2">&</span><span class="lifetime">'static </span>SupportedCipherSuite, |
| secrets: <span class="kw-2">&</span>SessionSecrets, |
| ) -> MessageCipherPair { |
| <span class="comment">// Make a key block, and chop it up. |
| // nb. we don'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">&</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">&</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">&</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">&</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">&</span>key_block[offs..]), |
| ) |
| } |
| |
| <span class="kw">pub fn </span>new_tls13_read( |
| scs: <span class="kw-2">&</span><span class="lifetime">'static </span>SupportedCipherSuite, |
| secret: <span class="kw-2">&</span>hkdf::Prk, |
| ) -> Box<<span class="kw">dyn </span>MessageDecrypter> { |
| <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">&</span><span class="lifetime">'static </span>SupportedCipherSuite, |
| secret: <span class="kw-2">&</span>hkdf::Prk, |
| ) -> Box<<span class="kw">dyn </span>MessageEncrypter> { |
| <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">&</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <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() < 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">&</span><span class="self">self</span>.dec_salt) |
| .unwrap(); |
| nonce[<span class="number">4</span>..] |
| .as_mut() |
| .write_all(<span class="kw-2">&</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">&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 > 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">&</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&</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">&</span>nonce.as_ref()[<span class="number">4</span>..]); |
| payload.extend_from_slice(<span class="kw-2">&</span>msg.payload); |
| |
| <span class="self">self</span>.enc_key |
| .seal_in_place_separate_tag(nonce, aad, <span class="kw-2">&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">"encrypt failed"</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">&</span><span class="lifetime">'static </span>aead::Algorithm, enc_key: <span class="kw-2">&</span>[u8], iv: Iv) -> 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">&</span><span class="lifetime">'static </span>aead::Algorithm, dec_key: <span class="kw-2">&</span>[u8], dec_iv: <span class="kw-2">&</span>[u8]) -> 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]) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(value) |
| } |
| |
| <span class="kw">fn </span>copy(value: <span class="kw-2">&</span>[u8]) -> <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">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8; <span class="number">12</span>] { |
| <span class="kw-2">&</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">&</span><span class="self">self</span>) -> usize { |
| aead::NONCE_LEN |
| } |
| } |
| |
| <span class="kw">impl </span>From<hkdf::Okm<<span class="lifetime">'_</span>, IvLen>> <span class="kw">for </span>Iv { |
| <span class="kw">fn </span>from(okm: hkdf::Okm<IvLen>) -> <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">&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">&mut </span>Vec<u8>) -> ContentType { |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>v.pop() { |
| <span class="prelude-val">Some</span>(<span class="number">0</span>) => {} |
| |
| <span class="prelude-val">Some</span>(content_type) => <span class="kw">return </span>ContentType::read_bytes(<span class="kw-2">&</span>[content_type]).unwrap(), |
| |
| <span class="prelude-val">None </span>=> <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">&</span>Iv, seq: u64) -> 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">&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) -> ring::aead::Aad<[u8; <span class="number">1 </span>+ <span class="number">2 </span>+ <span class="number">2</span>]> { |
| 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 >> <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">&</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <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">&</span>msg.payload); |
| msg.typ.encode(<span class="kw-2">&mut </span>buf); |
| |
| <span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&</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">&mut </span>buf) |
| .map_err(|<span class="kw">_</span>| TLSError::General(<span class="string">"encrypt failed"</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">&</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <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() < <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">&</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">&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() > 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">&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">"peer sent bad TLSInnerPlaintext"</span>.to_string(); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(TLSError::PeerMisbehavedError(msg)); |
| } |
| |
| <span class="kw">if </span>buf.len() > 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) -> 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) -> 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">&</span><span class="lifetime">'static </span>aead::Algorithm, |
| enc_key: <span class="kw-2">&</span>[u8], |
| enc_iv: Iv, |
| ) -> 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">&</span><span class="lifetime">'static </span>aead::Algorithm, |
| dec_key: <span class="kw-2">&</span>[u8], |
| dec_iv: Iv, |
| ) -> 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">&</span><span class="self">self</span>, <span class="kw-2">mut </span>msg: Message, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <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() < 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">&</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">&mut </span>buf) |
| .map_err(|<span class="kw">_</span>| TLSError::DecryptError)<span class="question-mark">? |
| </span>.len(); |
| |
| <span class="kw">if </span>plain_len > 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">&</span><span class="self">self</span>, msg: BorrowMessage, seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <span class="kw">let </span>nonce = make_tls13_nonce(<span class="kw-2">&</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">&</span>msg.payload); |
| |
| <span class="self">self</span>.enc_key |
| .seal_in_place_append_tag(nonce, aad, <span class="kw-2">&mut </span>buf) |
| .map_err(|<span class="kw">_</span>| TLSError::General(<span class="string">"encrypt failed"</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'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">&</span><span class="self">self</span>, _m: BorrowMessage, _seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <span class="prelude-val">Err</span>(TLSError::General(<span class="string">"encrypt not yet available"</span>.to_string())) |
| } |
| } |
| |
| <span class="doccomment">/// A `MessageDecrypter` which doesn'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">&</span><span class="self">self</span>, _m: Message, _seq: u64) -> <span class="prelude-ty">Result</span><Message, TLSError> { |
| <span class="prelude-val">Err</span>(TLSError::DecryptError) |
| } |
| } |
| </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> |