| <!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/constant_time.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>constant_time.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 2015-2016 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="doccomment">//! Constant-time operations. |
| |
| </span><span class="kw">use crate</span>::{c, error}; |
| |
| <span class="doccomment">/// Returns `Ok(())` if `a == b` and `Err(error::Unspecified)` otherwise. |
| /// The comparison of `a` and `b` is done in constant time with respect to the |
| /// contents of each, but NOT in constant time with respect to the lengths of |
| /// `a` and `b`. |
| </span><span class="kw">pub fn </span>verify_slices_are_equal(a: <span class="kw-2">&</span>[u8], b: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><(), error::Unspecified> { |
| <span class="kw">if </span>a.len() != b.len() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Unspecified); |
| } |
| <span class="kw">let </span>result = <span class="kw">unsafe </span>{ GFp_memcmp(a.as_ptr(), b.as_ptr(), a.len()) }; |
| <span class="kw">match </span>result { |
| <span class="number">0 </span>=> <span class="prelude-val">Ok</span>(()), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(error::Unspecified), |
| } |
| } |
| |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_memcmp(a: <span class="kw-2">*const </span>u8, b: <span class="kw-2">*const </span>u8, len: c::size_t) -> c::int; |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use crate</span>::{bssl, error}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_constant_time() -> <span class="prelude-ty">Result</span><(), error::Unspecified> { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>bssl_constant_time_test_main() -> bssl::Result; |
| } |
| Result::from(<span class="kw">unsafe </span>{ bssl_constant_time_test_main() }) |
| } |
| } |
| </code></pre></div> |
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