| <!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/ecdh.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ecdh.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 2015-2017 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">//! ECDH key agreement using the P-256 and P-384 curves. |
| |
| </span><span class="kw">use super</span>::{ops::<span class="kw-2">*</span>, private_key::<span class="kw-2">*</span>, public_key::<span class="kw-2">*</span>}; |
| <span class="kw">use crate</span>::{agreement, ec, error}; |
| |
| <span class="doccomment">/// A key agreement algorithm. |
| </span><span class="macro">macro_rules! </span>ecdh { |
| ( <span class="macro-nonterminal">$NAME</span>:ident, <span class="macro-nonterminal">$curve</span>:expr, <span class="macro-nonterminal">$name_str</span>:expr, <span class="macro-nonterminal">$private_key_ops</span>:expr, |
| <span class="macro-nonterminal">$public_key_ops</span>:expr, <span class="macro-nonterminal">$ecdh</span>:ident ) => { |
| <span class="attribute">#[doc = <span class="string">"ECDH using the NSA Suite B"</span>] |
| #[doc=<span class="macro-nonterminal">$name_str</span>] |
| #[doc = <span class="string">"curve."</span>] |
| </span><span class="doccomment">/// |
| /// Public keys are encoding in uncompressed form using the |
| /// Octet-String-to-Elliptic-Curve-Point algorithm in |
| /// [SEC 1: Elliptic Curve Cryptography, Version 2.0]. Public keys are |
| /// validated during key agreement according to |
| /// [NIST Special Publication 800-56A, revision 2] and Appendix B.3 of |
| /// the NSA's [Suite B Implementer's Guide to NIST SP 800-56A]. |
| /// |
| /// [SEC 1: Elliptic Curve Cryptography, Version 2.0]: |
| /// http://www.secg.org/sec1-v2.pdf |
| /// [NIST Special Publication 800-56A, revision 2]: |
| /// http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf |
| /// [Suite B Implementer's Guide to NIST SP 800-56A]: |
| /// https://github.com/briansmith/ring/blob/main/doc/ecdh.pdf |
| </span><span class="kw">pub static </span><span class="macro-nonterminal">$NAME</span>: agreement::Algorithm = agreement::Algorithm { |
| curve: <span class="macro-nonterminal">$curve</span>, |
| ecdh: <span class="macro-nonterminal">$ecdh</span>, |
| }; |
| |
| <span class="kw">fn </span><span class="macro-nonterminal">$ecdh</span>( |
| out: <span class="kw-2">&mut </span>[u8], |
| my_private_key: <span class="kw-2">&</span>ec::Seed, |
| peer_public_key: untrusted::Input, |
| ) -> <span class="prelude-ty">Result</span><(), error::Unspecified> { |
| ecdh( |
| <span class="macro-nonterminal">$private_key_ops</span>, |
| <span class="macro-nonterminal">$public_key_ops</span>, |
| out, |
| my_private_key, |
| peer_public_key, |
| ) |
| } |
| }; |
| } |
| |
| <span class="macro">ecdh!</span>( |
| ECDH_P256, |
| <span class="kw-2">&</span>ec::suite_b::curve::P256, |
| <span class="string">"P-256 (secp256r1)"</span>, |
| <span class="kw-2">&</span>p256::PRIVATE_KEY_OPS, |
| <span class="kw-2">&</span>p256::PUBLIC_KEY_OPS, |
| p256_ecdh |
| ); |
| |
| <span class="macro">ecdh!</span>( |
| ECDH_P384, |
| <span class="kw-2">&</span>ec::suite_b::curve::P384, |
| <span class="string">"P-384 (secp384r1)"</span>, |
| <span class="kw-2">&</span>p384::PRIVATE_KEY_OPS, |
| <span class="kw-2">&</span>p384::PUBLIC_KEY_OPS, |
| p384_ecdh |
| ); |
| |
| <span class="kw">fn </span>ecdh( |
| private_key_ops: <span class="kw-2">&</span>PrivateKeyOps, |
| public_key_ops: <span class="kw-2">&</span>PublicKeyOps, |
| out: <span class="kw-2">&mut </span>[u8], |
| my_private_key: <span class="kw-2">&</span>ec::Seed, |
| peer_public_key: untrusted::Input, |
| ) -> <span class="prelude-ty">Result</span><(), error::Unspecified> { |
| <span class="comment">// The NIST SP 800-56Ar2 steps are from section 5.7.1.2 Elliptic Curve |
| // Cryptography Cofactor Diffie-Hellman (ECC CDH) Primitive. |
| // |
| // The "NSA Guide" steps are from section 3.1 of the NSA guide, "Ephemeral |
| // Unified Model." |
| |
| // NSA Guide Step 1 is handled separately. |
| |
| // NIST SP 800-56Ar2 5.6.2.2.2. |
| // NSA Guide Step 2. |
| // |
| // `parse_uncompressed_point` verifies that the point is not at infinity |
| // and that it is on the curve, using the Partial Public-Key Validation |
| // Routine. |
| </span><span class="kw">let </span>peer_public_key = parse_uncompressed_point(public_key_ops, peer_public_key)<span class="question-mark">?</span>; |
| |
| <span class="comment">// NIST SP 800-56Ar2 Step 1. |
| // NSA Guide Step 3 (except point at infinity check). |
| // |
| // Note that the cofactor (h) is one since we only support prime-order |
| // curves, so we can safely ignore the cofactor. |
| // |
| // It is impossible for the result to be the point at infinity because our |
| // private key is in the range [1, n) and the curve has prime order and |
| // `parse_uncompressed_point` verified that the peer public key is on the |
| // curve and not at infinity. However, since the standards require the |
| // check, we do it using `assert!`. |
| // |
| // NIST SP 800-56Ar2 defines "Destroy" thusly: "In this Recommendation, to |
| // destroy is an action applied to a key or a piece of secret data. After |
| // a key or a piece of secret data is destroyed, no information about its |
| // value can be recovered." We interpret "destroy" somewhat liberally: we |
| // assume that since we throw away the values to be destroyed, no |
| // information about their values can be recovered. This doesn't meet the |
| // NSA guide's explicit requirement to "zeroize" them though. |
| // TODO: this only needs common scalar ops |
| </span><span class="kw">let </span>my_private_key = private_key_as_scalar(private_key_ops, my_private_key); |
| <span class="kw">let </span>product = private_key_ops.point_mul(<span class="kw-2">&</span>my_private_key, <span class="kw-2">&</span>peer_public_key); |
| |
| <span class="comment">// NIST SP 800-56Ar2 Steps 2, 3, 4, and 5. |
| // NSA Guide Steps 3 (point at infinity check) and 4. |
| // |
| // Again, we have a pretty liberal interpretation of the NIST's spec's |
| // "Destroy" that doesn't meet the NSA requirement to "zeroize." |
| // `big_endian_affine_from_jacobian` verifies that the result is not at |
| // infinity and also does an extra check to verify that the point is on |
| // the curve. |
| </span>big_endian_affine_from_jacobian(private_key_ops, <span class="prelude-val">Some</span>(out), <span class="prelude-val">None</span>, <span class="kw-2">&</span>product) |
| |
| <span class="comment">// NSA Guide Step 5 & 6 are deferred to the caller. Again, we have a |
| // pretty liberal interpretation of the NIST's spec's "Destroy" that |
| // doesn't meet the NSA requirement to "zeroize." |
| </span>} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::ops; |
| <span class="kw">use crate</span>::{agreement, ec, limb, test}; |
| |
| <span class="kw">static </span>SUPPORTED_SUITE_B_ALGS: [(<span class="kw-2">&</span>str, <span class="kw-2">&</span>agreement::Algorithm, <span class="kw-2">&</span>ec::Curve, <span class="kw-2">&</span>ops::CommonOps); <span class="number">2</span>] = [ |
| ( |
| <span class="string">"P-256"</span>, |
| <span class="kw-2">&</span>agreement::ECDH_P256, |
| <span class="kw-2">&</span><span class="kw">super</span>::<span class="kw">super</span>::curve::P256, |
| <span class="kw-2">&</span><span class="kw">super</span>::<span class="kw">super</span>::ops::p256::COMMON_OPS, |
| ), |
| ( |
| <span class="string">"P-384"</span>, |
| <span class="kw-2">&</span>agreement::ECDH_P384, |
| <span class="kw-2">&</span><span class="kw">super</span>::<span class="kw">super</span>::curve::P384, |
| <span class="kw-2">&</span><span class="kw">super</span>::<span class="kw">super</span>::ops::p384::COMMON_OPS, |
| ), |
| ]; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_agreement_suite_b_ecdh_generate() { |
| <span class="comment">// Generates a string of bytes 0x00...00, which will always result in |
| // a scalar value of zero. |
| </span><span class="kw">let </span>random_00 = test::rand::FixedByteRandom { byte: <span class="number">0x00 </span>}; |
| |
| <span class="comment">// Generates a string of bytes 0xFF...FF, which will be larger than the |
| // group order of any curve that is supported. |
| </span><span class="kw">let </span>random_ff = test::rand::FixedByteRandom { byte: <span class="number">0xff </span>}; |
| |
| <span class="kw">for </span><span class="kw-2">&</span>(<span class="kw">_</span>, alg, curve, ops) <span class="kw">in </span>SUPPORTED_SUITE_B_ALGS.iter() { |
| <span class="comment">// Test that the private key value zero is rejected and that |
| // `generate` gives up after a while of only getting zeros. |
| </span><span class="macro">assert!</span>(agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>random_00).is_err()); |
| |
| <span class="comment">// Test that the private key value larger than the group order is |
| // rejected and that `generate` gives up after a while of only |
| // getting values larger than the group order. |
| </span><span class="macro">assert!</span>(agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>random_ff).is_err()); |
| |
| <span class="comment">// Test that a private key value exactly equal to the group order |
| // is rejected and that `generate` gives up after a while of only |
| // getting that value from the PRNG. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>n_bytes = [<span class="number">0u8</span>; ec::SCALAR_MAX_BYTES]; |
| <span class="kw">let </span>num_bytes = curve.elem_scalar_seed_len; |
| limb::big_endian_from_limbs(<span class="kw-2">&</span>ops.n.limbs[..ops.num_limbs], <span class="kw-2">&mut </span>n_bytes[..num_bytes]); |
| { |
| <span class="kw">let </span>n_bytes = <span class="kw-2">&mut </span>n_bytes[..num_bytes]; |
| <span class="kw">let </span>rng = test::rand::FixedSliceRandom { bytes: n_bytes }; |
| <span class="macro">assert!</span>(agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>rng).is_err()); |
| } |
| |
| <span class="comment">// Test that a private key value exactly equal to the group order |
| // minus 1 is accepted. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>n_minus_1_bytes = n_bytes; |
| { |
| <span class="kw">let </span>n_minus_1_bytes = <span class="kw-2">&mut </span>n_minus_1_bytes[..num_bytes]; |
| n_minus_1_bytes[num_bytes - <span class="number">1</span>] -= <span class="number">1</span>; |
| <span class="kw">let </span>rng = test::rand::FixedSliceRandom { |
| bytes: n_minus_1_bytes, |
| }; |
| <span class="kw">let </span>key = agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>rng).unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>n_minus_1_bytes[..], key.bytes()); |
| } |
| |
| <span class="comment">// Test that n + 1 also fails. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>n_plus_1_bytes = n_bytes; |
| { |
| <span class="kw">let </span>n_plus_1_bytes = <span class="kw-2">&mut </span>n_plus_1_bytes[..num_bytes]; |
| n_plus_1_bytes[num_bytes - <span class="number">1</span>] += <span class="number">1</span>; |
| <span class="kw">let </span>rng = test::rand::FixedSliceRandom { |
| bytes: n_plus_1_bytes, |
| }; |
| <span class="macro">assert!</span>(agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>rng).is_err()); |
| } |
| |
| <span class="comment">// Test recovery from initial RNG failure. The first value will be |
| // n, then n + 1, then zero, the next value will be n - 1, which |
| // will be accepted. |
| </span>{ |
| <span class="kw">let </span>bytes = [ |
| <span class="kw-2">&</span>n_bytes[..num_bytes], |
| <span class="kw-2">&</span>n_plus_1_bytes[..num_bytes], |
| <span class="kw-2">&</span>[<span class="number">0u8</span>; ec::SCALAR_MAX_BYTES][..num_bytes], |
| <span class="kw-2">&</span>n_minus_1_bytes[..num_bytes], |
| ]; |
| <span class="kw">let </span>rng = test::rand::FixedSliceSequenceRandom { |
| bytes: <span class="kw-2">&</span>bytes, |
| current: core::cell::UnsafeCell::new(<span class="number">0</span>), |
| }; |
| <span class="kw">let </span>key = agreement::EphemeralPrivateKey::generate(alg, <span class="kw-2">&</span>rng).unwrap(); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>n_minus_1_bytes[..num_bytes], key.bytes()); |
| } |
| } |
| } |
| } |
| </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> |
