| <!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/ec/suite_b/public_key.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>public_key.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 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">//! Functionality shared by operations on public keys (ECDSA verification and |
| //! ECDH agreement). |
| |
| </span><span class="kw">use super</span>::{ops::<span class="kw-2">*</span>, verify_affine_point_is_on_the_curve}; |
| <span class="kw">use crate</span>::{arithmetic::montgomery::<span class="kw-2">*</span>, error}; |
| |
| <span class="doccomment">/// Parses a public key encoded in uncompressed form. The key is validated |
| /// using the ECC Partial Public-Key Validation Routine from |
| /// [NIST SP 800-56A, revision 2] Section 5.6.2.3.3, the NSA's |
| /// "Suite B Implementer's Guide to NIST SP 800-56A," Appendix B.3, and the |
| /// NSA's "Suite B Implementer's Guide to FIPS 186-3 (ECDSA)," Appendix A.3. |
| /// |
| /// [NIST SP 800-56A, revision 2]: |
| /// http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf |
| </span><span class="kw">pub fn </span>parse_uncompressed_point( |
| ops: <span class="kw-2">&</span>PublicKeyOps, |
| input: untrusted::Input, |
| ) -> <span class="prelude-ty">Result</span><(Elem<R>, Elem<R>), error::Unspecified> { |
| <span class="comment">// NIST SP 800-56A Step 1: "Verify that Q is not the point at infinity. |
| // This can be done by inspection if the point is entered in the standard |
| // affine representation." (We do it by inspection since we only accept |
| // the affine representation.) |
| </span><span class="kw">let </span>(x, y) = input.read_all(error::Unspecified, |input| { |
| <span class="comment">// The encoding must be 4, which is the encoding for "uncompressed". |
| </span><span class="kw">let </span>encoding = input.read_byte()<span class="question-mark">?</span>; |
| <span class="kw">if </span>encoding != <span class="number">4 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Unspecified); |
| } |
| |
| <span class="comment">// NIST SP 800-56A Step 2: "Verify that xQ and yQ are integers in the |
| // interval [0, p-1] in the case that q is an odd prime p[.]" |
| </span><span class="kw">let </span>x = ops.elem_parse(input)<span class="question-mark">?</span>; |
| <span class="kw">let </span>y = ops.elem_parse(input)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((x, y)) |
| })<span class="question-mark">?</span>; |
| |
| <span class="comment">// NIST SP 800-56A Step 3: "If q is an odd prime p, verify that |
| // yQ**2 = xQ**3 + axQ + b in GF(p), where the arithmetic is performed |
| // modulo p." |
| </span>verify_affine_point_is_on_the_curve(ops.common, (<span class="kw-2">&</span>x, <span class="kw-2">&</span>y))<span class="question-mark">?</span>; |
| |
| <span class="comment">// NIST SP 800-56A Note: "Since its order is not verified, there is no |
| // check that the public key is in the correct EC subgroup." |
| // |
| // NSA Suite B Implementer's Guide Note: "ECC Full Public-Key Validation |
| // includes an additional check to ensure that the point has the correct |
| // order. This check is not necessary for curves having prime order (and |
| // cofactor h = 1), such as P-256 and P-384." |
| |
| </span><span class="prelude-val">Ok</span>((x, y)) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::{<span class="kw">super</span>::ops, <span class="kw-2">*</span>}; |
| <span class="kw">use </span><span class="kw">crate</span>::test; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>parse_uncompressed_point_test() { |
| test::run( |
| <span class="macro">test_file!</span>(<span class="string">"suite_b_public_key_tests.txt"</span>), |
| |section, test_case| { |
| <span class="macro">assert_eq!</span>(section, <span class="string">""</span>); |
| |
| <span class="kw">let </span>curve_name = test_case.consume_string(<span class="string">"Curve"</span>); |
| |
| <span class="kw">let </span>public_key = test_case.consume_bytes(<span class="string">"Q"</span>); |
| <span class="kw">let </span>public_key = untrusted::Input::from(<span class="kw-2">&</span>public_key); |
| <span class="kw">let </span>is_valid = test_case.consume_string(<span class="string">"Result"</span>) == <span class="string">"P"</span>; |
| |
| <span class="kw">let </span>curve_ops = public_key_ops_from_curve_name(<span class="kw-2">&</span>curve_name); |
| |
| <span class="kw">let </span>result = parse_uncompressed_point(curve_ops, public_key); |
| <span class="macro">assert_eq!</span>(is_valid, result.is_ok()); |
| |
| <span class="comment">// TODO: Verify that we when we re-serialize the parsed (x, y), the |
| // output is equal to the input. |
| |
| </span><span class="prelude-val">Ok</span>(()) |
| }, |
| ); |
| } |
| |
| <span class="kw">fn </span>public_key_ops_from_curve_name(curve_name: <span class="kw-2">&</span>str) -> <span class="kw-2">&</span><span class="lifetime">'static </span>PublicKeyOps { |
| <span class="kw">if </span>curve_name == <span class="string">"P-256" </span>{ |
| <span class="kw-2">&</span>ops::p256::PUBLIC_KEY_OPS |
| } <span class="kw">else if </span>curve_name == <span class="string">"P-384" </span>{ |
| <span class="kw-2">&</span>ops::p384::PUBLIC_KEY_OPS |
| } <span class="kw">else </span>{ |
| <span class="macro">panic!</span>(<span class="string">"Unsupported curve: {}"</span>, curve_name); |
| } |
| } |
| } |
| </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> |
