| <!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/nonce.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>nonce.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 </span><span class="kw">crate</span>::error; |
| <span class="kw">use </span>core::convert::TryInto; |
| |
| <span class="doccomment">/// A nonce for a single AEAD opening or sealing operation. |
| /// |
| /// The user must ensure, for a particular key, that each nonce is unique. |
| /// |
| /// `Nonce` intentionally doesn't implement `Clone` to ensure that each one is |
| /// consumed at most once. |
| </span><span class="kw">pub struct </span>Nonce([u8; NONCE_LEN]); |
| |
| <span class="kw">impl </span>Nonce { |
| <span class="doccomment">/// Constructs a `Nonce` with the given value, assuming that the value is |
| /// unique for the lifetime of the key it is being used with. |
| /// |
| /// Fails if `value` isn't `NONCE_LEN` bytes long. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>try_assume_unique_for_key(value: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::Unspecified> { |
| <span class="kw">let </span>value: <span class="kw-2">&</span>[u8; NONCE_LEN] = value.try_into()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">Self</span>::assume_unique_for_key(<span class="kw-2">*</span>value)) |
| } |
| |
| <span class="doccomment">/// Constructs a `Nonce` with the given value, assuming that the value is |
| /// unique for the lifetime of the key it is being used with. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>assume_unique_for_key(value: [u8; NONCE_LEN]) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(value) |
| } |
| } |
| |
| <span class="kw">impl </span>AsRef<[u8; NONCE_LEN]> <span class="kw">for </span>Nonce { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8; NONCE_LEN] { |
| <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="doccomment">/// All the AEADs we support use 96-bit nonces. |
| </span><span class="kw">pub const </span>NONCE_LEN: usize = <span class="number">96 </span>/ <span class="number">8</span>; |
| </code></pre></div> |
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