| <!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/ring-0.16.20/src/aead/gcm.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>gcm.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="../../../ring/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="../../../ring/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="comment">// Copyright 2018 Brian Smith. |
| // |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY |
| // SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| // OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| </span><span class="kw">use super</span>::{Aad, Block, BLOCK_LEN}; |
| <span class="kw">use </span><span class="kw">crate</span>::cpu; |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span><span class="kw">mod </span>gcm_nohw; |
| |
| <span class="kw">pub struct </span>Key(HTable); |
| |
| <span class="kw">impl </span>Key { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(h_be: Block, cpu_features: cpu::Features) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>h = h_be.u64s_be_to_native(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>key = <span class="self">Self</span>(HTable { |
| Htable: [u128 { hi: <span class="number">0</span>, lo: <span class="number">0 </span>}; HTABLE_LEN], |
| }); |
| <span class="kw">let </span>h_table = <span class="kw-2">&mut </span>key.<span class="number">0</span>; |
| |
| <span class="kw">match </span>detect_implementation(cpu_features) { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span>Implementation::CLMUL <span class="kw">if </span>has_avx_movbe(cpu_features) => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_init_avx(HTable: <span class="kw-2">&mut </span>HTable, h: <span class="kw-2">&</span>[u64; <span class="number">2</span>]); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_init_avx(h_table, <span class="kw-2">&</span>h); |
| } |
| } |
| |
| <span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>))] |
| </span>Implementation::CLMUL => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_init_clmul(Htable: <span class="kw-2">&mut </span>HTable, h: <span class="kw-2">&</span>[u64; <span class="number">2</span>]); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_init_clmul(h_table, <span class="kw-2">&</span>h); |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>))] |
| </span>Implementation::NEON => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_init_neon(Htable: <span class="kw-2">&mut </span>HTable, h: <span class="kw-2">&</span>[u64; <span class="number">2</span>]); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_init_neon(h_table, <span class="kw-2">&</span>h); |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span>Implementation::Fallback => { |
| h_table.Htable[<span class="number">0</span>] = gcm_nohw::init(h); |
| } |
| } |
| |
| key |
| } |
| } |
| |
| <span class="kw">pub struct </span>Context { |
| inner: ContextInner, |
| cpu_features: cpu::Features, |
| } |
| |
| <span class="kw">impl </span>Context { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(key: <span class="kw-2">&</span>Key, aad: Aad<<span class="kw-2">&</span>[u8]>, cpu_features: cpu::Features) -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = Context { |
| inner: ContextInner { |
| Xi: Xi(Block::zero()), |
| _unused: Block::zero(), |
| Htable: key.<span class="number">0</span>.clone(), |
| }, |
| cpu_features, |
| }; |
| |
| <span class="kw">for </span>ad <span class="kw">in </span>aad.<span class="number">0</span>.chunks(BLOCK_LEN) { |
| <span class="kw">let </span><span class="kw-2">mut </span>block = Block::zero(); |
| block.overwrite_part_at(<span class="number">0</span>, ad); |
| ctx.update_block(block); |
| } |
| |
| ctx |
| } |
| |
| <span class="doccomment">/// Access to `inner` for the integrated AES-GCM implementations only. |
| </span><span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| #[inline] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>inner(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>ContextInner { |
| <span class="kw-2">&mut </span><span class="self">self</span>.inner |
| } |
| |
| <span class="kw">pub fn </span>update_blocks(<span class="kw-2">&mut </span><span class="self">self</span>, input: <span class="kw-2">&</span>[u8]) { |
| <span class="macro">debug_assert!</span>(input.len() > <span class="number">0</span>); |
| <span class="macro">debug_assert_eq!</span>(input.len() % BLOCK_LEN, <span class="number">0</span>); |
| |
| <span class="comment">// Although these functions take `Xi` and `h_table` as separate |
| // parameters, one or more of them might assume that they are part of |
| // the same `ContextInner` structure. |
| </span><span class="kw">let </span>xi = <span class="kw-2">&mut </span><span class="self">self</span>.inner.Xi; |
| <span class="kw">let </span>h_table = <span class="kw-2">&</span><span class="self">self</span>.inner.Htable; |
| |
| <span class="kw">match </span>detect_implementation(<span class="self">self</span>.cpu_features) { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span>Implementation::CLMUL <span class="kw">if </span>has_avx_movbe(<span class="self">self</span>.cpu_features) => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_ghash_avx( |
| xi: <span class="kw-2">&mut </span>Xi, |
| Htable: <span class="kw-2">&</span>HTable, |
| inp: <span class="kw-2">*const </span>u8, |
| len: <span class="kw">crate</span>::c::size_t, |
| ); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_ghash_avx(xi, h_table, input.as_ptr(), input.len()); |
| } |
| } |
| |
| <span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>))] |
| </span>Implementation::CLMUL => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_ghash_clmul( |
| xi: <span class="kw-2">&mut </span>Xi, |
| Htable: <span class="kw-2">&</span>HTable, |
| inp: <span class="kw-2">*const </span>u8, |
| len: <span class="kw">crate</span>::c::size_t, |
| ); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_ghash_clmul(xi, h_table, input.as_ptr(), input.len()); |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>))] |
| </span>Implementation::NEON => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_ghash_neon( |
| xi: <span class="kw-2">&mut </span>Xi, |
| Htable: <span class="kw-2">&</span>HTable, |
| inp: <span class="kw-2">*const </span>u8, |
| len: <span class="kw">crate</span>::c::size_t, |
| ); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_ghash_neon(xi, h_table, input.as_ptr(), input.len()); |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span>Implementation::Fallback => { |
| gcm_nohw::ghash(xi, h_table.Htable[<span class="number">0</span>], input); |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>update_block(<span class="kw-2">&mut </span><span class="self">self</span>, a: Block) { |
| <span class="self">self</span>.inner.Xi.bitxor_assign(a); |
| |
| <span class="comment">// Although these functions take `Xi` and `h_table` as separate |
| // parameters, one or more of them might assume that they are part of |
| // the same `ContextInner` structure. |
| </span><span class="kw">let </span>xi = <span class="kw-2">&mut </span><span class="self">self</span>.inner.Xi; |
| <span class="kw">let </span>h_table = <span class="kw-2">&</span><span class="self">self</span>.inner.Htable; |
| |
| <span class="kw">match </span>detect_implementation(<span class="self">self</span>.cpu_features) { |
| <span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>))] |
| </span>Implementation::CLMUL => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_gmult_clmul(xi: <span class="kw-2">&mut </span>Xi, Htable: <span class="kw-2">&</span>HTable); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_gmult_clmul(xi, h_table); |
| } |
| } |
| |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>))] |
| </span>Implementation::NEON => { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_gcm_gmult_neon(xi: <span class="kw-2">&mut </span>Xi, Htable: <span class="kw-2">&</span>HTable); |
| } |
| <span class="kw">unsafe </span>{ |
| GFp_gcm_gmult_neon(xi, h_table); |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span>Implementation::Fallback => { |
| gcm_nohw::gmult(xi, h_table.Htable[<span class="number">0</span>]); |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>pre_finish<F>(<span class="self">self</span>, f: F) -> <span class="kw">super</span>::Tag |
| <span class="kw">where |
| </span>F: FnOnce(Xi) -> <span class="kw">super</span>::Tag, |
| { |
| f(<span class="self">self</span>.inner.Xi) |
| } |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_avx2(<span class="kw-2">&</span><span class="self">self</span>, cpu_features: cpu::Features) -> bool { |
| <span class="kw">match </span>detect_implementation(cpu_features) { |
| Implementation::CLMUL => has_avx_movbe(<span class="self">self</span>.cpu_features), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| } |
| |
| <span class="comment">// The alignment is required by non-Rust code that uses `GCM128_CONTEXT`. |
| </span><span class="attribute">#[derive(Clone)] |
| #[repr(C, align(<span class="number">16</span>))] |
| </span><span class="kw">struct </span>HTable { |
| Htable: [u128; HTABLE_LEN], |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy)] |
| #[repr(C)] |
| </span><span class="kw">struct </span>u128 { |
| hi: u64, |
| lo: u64, |
| } |
| |
| <span class="kw">const </span>HTABLE_LEN: usize = <span class="number">16</span>; |
| |
| <span class="attribute">#[repr(transparent)] |
| </span><span class="kw">pub struct </span>Xi(Block); |
| |
| <span class="kw">impl </span>Xi { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>bitxor_assign(<span class="kw-2">&mut </span><span class="self">self</span>, a: Block) { |
| <span class="self">self</span>.<span class="number">0</span>.bitxor_assign(a) |
| } |
| } |
| |
| <span class="kw">impl </span>From<Xi> <span class="kw">for </span>Block { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(Xi(block): Xi) -> <span class="self">Self </span>{ |
| block |
| } |
| } |
| |
| <span class="comment">// This corresponds roughly to the `GCM128_CONTEXT` structure in BoringSSL. |
| // Some assembly language code, in particular the MOVEBE+AVX2 X86-64 |
| // implementation, requires this exact layout. |
| </span><span class="attribute">#[repr(C, align(<span class="number">16</span>))] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>ContextInner { |
| Xi: Xi, |
| _unused: Block, |
| Htable: HTable, |
| } |
| |
| <span class="kw">enum </span>Implementation { |
| <span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>))] |
| </span>CLMUL, |
| |
| <span class="attribute">#[cfg(any(target_arch = <span class="string">"aarch64"</span>, target_arch = <span class="string">"arm"</span>))] |
| </span>NEON, |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span>Fallback, |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>detect_implementation(cpu_features: cpu::Features) -> Implementation { |
| <span class="comment">// `cpu_features` is only used for specific platforms. |
| </span><span class="attribute">#[cfg(not(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>)))] |
| </span><span class="kw">let </span>_cpu_features = cpu_features; |
| |
| <span class="attribute">#[cfg(any( |
| target_arch = <span class="string">"aarch64"</span>, |
| target_arch = <span class="string">"arm"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| target_arch = <span class="string">"x86" |
| </span>))] |
| </span>{ |
| <span class="kw">if </span>(cpu::intel::FXSR.available(cpu_features) |
| && cpu::intel::PCLMULQDQ.available(cpu_features)) |
| || cpu::arm::PMULL.available(cpu_features) |
| { |
| <span class="kw">return </span>Implementation::CLMUL; |
| } |
| } |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span>{ |
| <span class="kw">if </span>cpu::arm::NEON.available(cpu_features) { |
| <span class="kw">return </span>Implementation::NEON; |
| } |
| } |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span>{ |
| <span class="kw">return </span>Implementation::NEON; |
| } |
| |
| <span class="attribute">#[cfg(not(target_arch = <span class="string">"aarch64"</span>))] |
| </span>Implementation::Fallback |
| } |
| |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">fn </span>has_avx_movbe(cpu_features: cpu::Features) -> bool { |
| cpu::intel::AVX.available(cpu_features) && cpu::intel::MOVBE.available(cpu_features) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="ring" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
