| <!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/ec/curve25519/ed25519/verification.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>verification.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">//! EdDSA Signatures. |
| |
| </span><span class="kw">use super</span>::{<span class="kw">super</span>::ops::<span class="kw-2">*</span>, eddsa_digest}; |
| <span class="kw">use crate</span>::{error, sealed, signature}; |
| <span class="kw">use </span>core::convert::TryInto; |
| |
| <span class="doccomment">/// Parameters for EdDSA signing and verification. |
| </span><span class="kw">pub struct </span>EdDSAParameters; |
| |
| <span class="kw">impl </span>core::fmt::Debug <span class="kw">for </span>EdDSAParameters { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>core::fmt::Formatter) -> <span class="prelude-ty">Result</span><(), core::fmt::Error> { |
| <span class="macro">write!</span>(f, <span class="string">"ring::signature::ED25519"</span>) |
| } |
| } |
| |
| <span class="doccomment">/// Verification of [Ed25519] signatures. |
| /// |
| /// Ed25519 uses SHA-512 as the digest algorithm. |
| /// |
| /// [Ed25519]: https://ed25519.cr.yp.to/ |
| </span><span class="kw">pub static </span>ED25519: EdDSAParameters = EdDSAParameters {}; |
| |
| <span class="kw">impl </span>signature::VerificationAlgorithm <span class="kw">for </span>EdDSAParameters { |
| <span class="kw">fn </span>verify( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| public_key: untrusted::Input, |
| msg: untrusted::Input, |
| signature: untrusted::Input, |
| ) -> <span class="prelude-ty">Result</span><(), error::Unspecified> { |
| <span class="kw">let </span>public_key: <span class="kw-2">&</span>[u8; ELEM_LEN] = public_key.as_slice_less_safe().try_into()<span class="question-mark">?</span>; |
| <span class="kw">let </span>(signature_r, signature_s) = signature.read_all(error::Unspecified, |input| { |
| <span class="kw">let </span>signature_r: <span class="kw-2">&</span>[u8; ELEM_LEN] = input |
| .read_bytes(ELEM_LEN)<span class="question-mark">? |
| </span>.as_slice_less_safe() |
| .try_into()<span class="question-mark">?</span>; |
| <span class="kw">let </span>signature_s: <span class="kw-2">&</span>[u8; SCALAR_LEN] = input |
| .read_bytes(SCALAR_LEN)<span class="question-mark">? |
| </span>.as_slice_less_safe() |
| .try_into()<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((signature_r, signature_s)) |
| })<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>signature_s = Scalar::from_bytes_checked(<span class="kw-2">*</span>signature_s)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>a = ExtPoint::from_encoded_point_vartime(public_key)<span class="question-mark">?</span>; |
| a.invert_vartime(); |
| |
| <span class="kw">let </span>h_digest = eddsa_digest(signature_r, public_key, msg.as_slice_less_safe()); |
| <span class="kw">let </span>h = Scalar::from_sha512_digest_reduced(h_digest); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Point::new_at_infinity(); |
| <span class="kw">unsafe </span>{ GFp_x25519_ge_double_scalarmult_vartime(<span class="kw-2">&mut </span>r, <span class="kw-2">&</span>h, <span class="kw-2">&</span>a, <span class="kw-2">&</span>signature_s) }; |
| <span class="kw">let </span>r_check = r.into_encoded_point(); |
| <span class="kw">if </span><span class="kw-2">*</span>signature_r != r_check { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Unspecified); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>sealed::Sealed <span class="kw">for </span>EdDSAParameters {} |
| |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_x25519_ge_double_scalarmult_vartime( |
| r: <span class="kw-2">&mut </span>Point, |
| a_coeff: <span class="kw-2">&</span>Scalar, |
| a: <span class="kw-2">&</span>ExtPoint, |
| b_coeff: <span class="kw-2">&</span>Scalar, |
| ); |
| } |
| </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> |
