| <!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/ring/src/aead/block.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>block.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 crate</span>::{endian::<span class="kw-2">*</span>, polyfill}; |
| |
| <span class="doccomment">/// An array of 16 bytes that can (in the x86_64 and AAarch64 ABIs, at least) |
| /// be efficiently passed by value and returned by value (i.e. in registers), |
| /// and which meets the alignment requirements of `u32` and `u64` (at least) |
| /// for the target. |
| </span><span class="attribute">#[repr(C)] |
| #[derive(Copy, Clone)] |
| </span><span class="kw">pub struct </span>Block { |
| subblocks: [u64; <span class="number">2</span>], |
| } |
| |
| <span class="kw">pub const </span>BLOCK_LEN: usize = <span class="number">16</span>; |
| |
| <span class="kw">impl </span>Block { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>zero() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ subblocks: [<span class="number">0</span>, <span class="number">0</span>] } |
| } |
| |
| <span class="comment">// TODO: Remove this. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>from_u64_le(first: LittleEndian<u64>, second: LittleEndian<u64>) -> <span class="self">Self </span>{ |
| <span class="attribute">#[allow(deprecated)] |
| </span><span class="self">Self </span>{ |
| subblocks: [first.into_raw_value(), second.into_raw_value()], |
| } |
| } |
| |
| <span class="comment">// TODO: Remove this. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>from_u64_be(first: BigEndian<u64>, second: BigEndian<u64>) -> <span class="self">Self </span>{ |
| <span class="attribute">#[allow(deprecated)] |
| </span><span class="self">Self </span>{ |
| subblocks: [first.into_raw_value(), second.into_raw_value()], |
| } |
| } |
| |
| <span class="kw">pub fn </span>u64s_be_to_native(<span class="kw-2">&</span><span class="self">self</span>) -> [u64; <span class="number">2</span>] { |
| [ |
| u64::from_be(<span class="self">self</span>.subblocks[<span class="number">0</span>]), |
| u64::from_be(<span class="self">self</span>.subblocks[<span class="number">1</span>]), |
| ] |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>overwrite_part_at(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize, a: <span class="kw-2">&</span>[u8]) { |
| <span class="kw">let </span><span class="kw-2">mut </span>tmp: [u8; BLOCK_LEN] = <span class="kw-2">*</span><span class="self">self</span>.as_ref(); |
| tmp[index..][..a.len()].copy_from_slice(a); |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">Self</span>::from(<span class="kw-2">&</span>tmp) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>zero_from(<span class="kw-2">&mut </span><span class="self">self</span>, index: usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>tmp: [u8; BLOCK_LEN] = <span class="kw-2">*</span><span class="self">self</span>.as_ref(); |
| polyfill::slice::fill(<span class="kw-2">&mut </span>tmp[index..], <span class="number">0</span>); |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">Self</span>::from(<span class="kw-2">&</span>tmp) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>bitxor_assign(<span class="kw-2">&mut </span><span class="self">self</span>, a: Block) { |
| <span class="kw">for </span>(r, a) <span class="kw">in </span><span class="self">self</span>.subblocks.iter_mut().zip(a.subblocks.iter()) { |
| <span class="kw-2">*</span>r ^= <span class="kw-2">*</span>a; |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<<span class="kw-2">&</span><span class="lifetime">'_ </span>[u8; BLOCK_LEN]> <span class="kw">for </span>Block { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>from(bytes: <span class="kw-2">&</span>[u8; BLOCK_LEN]) -> <span class="self">Self </span>{ |
| <span class="kw">unsafe </span>{ core::mem::transmute_copy(bytes) } |
| } |
| } |
| |
| <span class="kw">impl </span>AsRef<[u8; BLOCK_LEN]> <span class="kw">for </span>Block { |
| <span class="attribute">#[allow(clippy::transmute_ptr_to_ptr)] |
| #[inline] |
| </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8; BLOCK_LEN] { |
| <span class="kw">unsafe </span>{ core::mem::transmute(<span class="self">self</span>) } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_bitxor_assign() { |
| <span class="kw">const </span>ONES: u64 = -<span class="number">1i64 </span><span class="kw">as </span>u64; |
| <span class="kw">const </span>TEST_CASES: <span class="kw-2">&</span>[([u64; <span class="number">2</span>], [u64; <span class="number">2</span>], [u64; <span class="number">2</span>])] = <span class="kw-2">&</span>[ |
| ([<span class="number">0</span>, <span class="number">0</span>], [<span class="number">0</span>, <span class="number">0</span>], [<span class="number">0</span>, <span class="number">0</span>]), |
| ([<span class="number">0</span>, <span class="number">0</span>], [ONES, ONES], [ONES, ONES]), |
| ([<span class="number">0</span>, ONES], [ONES, <span class="number">0</span>], [ONES, ONES]), |
| ([ONES, <span class="number">0</span>], [<span class="number">0</span>, ONES], [ONES, ONES]), |
| ([ONES, ONES], [ONES, ONES], [<span class="number">0</span>, <span class="number">0</span>]), |
| ]; |
| <span class="kw">for </span>(expected_result, a, b) <span class="kw">in </span>TEST_CASES { |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Block::from_u64_le(a[<span class="number">0</span>].into(), a[<span class="number">1</span>].into()); |
| r.bitxor_assign(Block::from_u64_le(b[<span class="number">0</span>].into(), b[<span class="number">1</span>].into())); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>expected_result, r.subblocks); |
| |
| <span class="comment">// XOR is symmetric. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>r = Block::from_u64_le(b[<span class="number">0</span>].into(), b[<span class="number">1</span>].into()); |
| r.bitxor_assign(Block::from_u64_le(a[<span class="number">0</span>].into(), a[<span class="number">1</span>].into())); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>expected_result, r.subblocks); |
| } |
| } |
| } |
| </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> |
