| <!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/signing.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>signing.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, ED25519_PUBLIC_KEY_LEN}; |
| <span class="kw">use crate</span>::{ |
| digest, error, |
| io::der, |
| pkcs8, rand, |
| signature::{<span class="self">self</span>, KeyPair <span class="kw">as </span>SigningKeyPair}, |
| }; |
| <span class="kw">use </span>core::convert::TryInto; |
| |
| <span class="doccomment">/// An Ed25519 key pair, for signing. |
| </span><span class="kw">pub struct </span>Ed25519KeyPair { |
| <span class="comment">// RFC 8032 Section 5.1.6 calls this *s*. |
| </span>private_scalar: Scalar, |
| |
| <span class="comment">// RFC 8032 Section 5.1.6 calls this *prefix*. |
| </span>private_prefix: Prefix, |
| |
| <span class="comment">// RFC 8032 Section 5.1.5 calls this *A*. |
| </span>public_key: PublicKey, |
| } |
| |
| <span class="macro">derive_debug_via_field!</span>(Ed25519KeyPair, <span class="macro">stringify!</span>(Ed25519KeyPair), public_key); |
| |
| <span class="kw">impl </span>Ed25519KeyPair { |
| <span class="doccomment">/// Generates a new key pair and returns the key pair serialized as a |
| /// PKCS#8 document. |
| /// |
| /// The PKCS#8 document will be a v2 `OneAsymmetricKey` with the public key, |
| /// as described in [RFC 5958 Section 2]; see [RFC 8410 Section 10.3] for an |
| /// example. |
| /// |
| /// [RFC 5958 Section 2]: https://tools.ietf.org/html/rfc5958#section-2 |
| /// [RFC 8410 Section 10.3]: https://tools.ietf.org/html/rfc8410#section-10.3 |
| </span><span class="kw">pub fn </span>generate_pkcs8( |
| rng: <span class="kw-2">&</span><span class="kw">dyn </span>rand::SecureRandom, |
| ) -> <span class="prelude-ty">Result</span><pkcs8::Document, error::Unspecified> { |
| <span class="kw">let </span>seed: [u8; SEED_LEN] = rand::generate(rng)<span class="question-mark">?</span>.expose(); |
| <span class="kw">let </span>key_pair = <span class="self">Self</span>::from_seed_(<span class="kw-2">&</span>seed); |
| <span class="prelude-val">Ok</span>(pkcs8::wrap_key( |
| <span class="kw-2">&</span>PKCS8_TEMPLATE, |
| <span class="kw-2">&</span>seed[..], |
| key_pair.public_key().as_ref(), |
| )) |
| } |
| |
| <span class="doccomment">/// Constructs an Ed25519 key pair by parsing an unencrypted PKCS#8 v2 |
| /// Ed25519 private key. |
| /// |
| /// `openssl genpkey -algorithm ED25519` generates PKCS# v1 keys, which |
| /// require the use of `Ed25519KeyPair::from_pkcs8_maybe_unchecked()` |
| /// instead of `Ed25519KeyPair::from_pkcs8()`. |
| /// |
| /// The input must be in PKCS#8 v2 format, and in particular it must contain |
| /// the public key in addition to the private key. `from_pkcs8()` will |
| /// verify that the public key and the private key are consistent with each |
| /// other. |
| /// |
| /// If you need to parse PKCS#8 v1 files (without the public key) then use |
| /// `Ed25519KeyPair::from_pkcs8_maybe_unchecked()` instead. |
| </span><span class="kw">pub fn </span>from_pkcs8(pkcs8: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::KeyRejected> { |
| <span class="kw">let </span>(seed, public_key) = |
| unwrap_pkcs8(pkcs8::Version::V2Only, untrusted::Input::from(pkcs8))<span class="question-mark">?</span>; |
| <span class="self">Self</span>::from_seed_and_public_key( |
| seed.as_slice_less_safe(), |
| public_key.unwrap().as_slice_less_safe(), |
| ) |
| } |
| |
| <span class="doccomment">/// Constructs an Ed25519 key pair by parsing an unencrypted PKCS#8 v1 or v2 |
| /// Ed25519 private key. |
| /// |
| /// `openssl genpkey -algorithm ED25519` generates PKCS# v1 keys. |
| /// |
| /// It is recommended to use `Ed25519KeyPair::from_pkcs8()`, which accepts |
| /// only PKCS#8 v2 files that contain the public key. |
| /// `from_pkcs8_maybe_unchecked()` parses PKCS#2 files exactly like |
| /// `from_pkcs8()`. It also accepts v1 files. PKCS#8 v1 files do not contain |
| /// the public key, so when a v1 file is parsed the public key will be |
| /// computed from the private key, and there will be no consistency check |
| /// between the public key and the private key. |
| /// |
| /// PKCS#8 v2 files are parsed exactly like `Ed25519KeyPair::from_pkcs8()`. |
| </span><span class="kw">pub fn </span>from_pkcs8_maybe_unchecked(pkcs8: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::KeyRejected> { |
| <span class="kw">let </span>(seed, public_key) = |
| unwrap_pkcs8(pkcs8::Version::V1OrV2, untrusted::Input::from(pkcs8))<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(public_key) = public_key { |
| <span class="self">Self</span>::from_seed_and_public_key( |
| seed.as_slice_less_safe(), |
| public_key.as_slice_less_safe(), |
| ) |
| } <span class="kw">else </span>{ |
| <span class="self">Self</span>::from_seed_unchecked(seed.as_slice_less_safe()) |
| } |
| } |
| |
| <span class="doccomment">/// Constructs an Ed25519 key pair from the private key seed `seed` and its |
| /// public key `public_key`. |
| /// |
| /// It is recommended to use `Ed25519KeyPair::from_pkcs8()` instead. |
| /// |
| /// The private and public keys will be verified to be consistent with each |
| /// other. This helps avoid misuse of the key (e.g. accidentally swapping |
| /// the private key and public key, or using the wrong private key for the |
| /// public key). This also detects any corruption of the public or private |
| /// key. |
| </span><span class="kw">pub fn </span>from_seed_and_public_key( |
| seed: <span class="kw-2">&</span>[u8], |
| public_key: <span class="kw-2">&</span>[u8], |
| ) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::KeyRejected> { |
| <span class="kw">let </span>pair = <span class="self">Self</span>::from_seed_unchecked(seed)<span class="question-mark">?</span>; |
| |
| <span class="comment">// This implicitly verifies that `public_key` is the right length. |
| // XXX: This rejects ~18 keys when they are partially reduced, though |
| // those keys are virtually impossible to find. |
| </span><span class="kw">if </span>public_key != pair.public_key.as_ref() { |
| <span class="kw">let </span>err = <span class="kw">if </span>public_key.len() != pair.public_key.as_ref().len() { |
| error::KeyRejected::invalid_encoding() |
| } <span class="kw">else </span>{ |
| error::KeyRejected::inconsistent_components() |
| }; |
| <span class="kw">return </span><span class="prelude-val">Err</span>(err); |
| } |
| |
| <span class="prelude-val">Ok</span>(pair) |
| } |
| |
| <span class="doccomment">/// Constructs a Ed25519 key pair from the private key seed `seed`. |
| /// |
| /// It is recommended to use `Ed25519KeyPair::from_pkcs8()` instead. When |
| /// that is not practical, it is recommended to use |
| /// `Ed25519KeyPair::from_seed_and_public_key()` instead. |
| /// |
| /// Since the public key is not given, the public key will be computed from |
| /// the private key. It is not possible to detect misuse or corruption of |
| /// the private key since the public key isn't given as input. |
| </span><span class="kw">pub fn </span>from_seed_unchecked(seed: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::KeyRejected> { |
| <span class="kw">let </span>seed = seed |
| .try_into() |
| .map_err(|<span class="kw">_</span>| error::KeyRejected::invalid_encoding())<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(<span class="self">Self</span>::from_seed_(seed)) |
| } |
| |
| <span class="kw">fn </span>from_seed_(seed: <span class="kw-2">&</span>Seed) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>h = digest::digest(<span class="kw-2">&</span>digest::SHA512, seed); |
| <span class="kw">let </span>(private_scalar, private_prefix) = h.as_ref().split_at(SCALAR_LEN); |
| |
| <span class="kw">let </span>private_scalar = |
| MaskedScalar::from_bytes_masked(private_scalar.try_into().unwrap()).into(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>a = ExtPoint::new_at_infinity(); |
| <span class="kw">unsafe </span>{ |
| GFp_x25519_ge_scalarmult_base(<span class="kw-2">&mut </span>a, <span class="kw-2">&</span>private_scalar); |
| } |
| |
| <span class="self">Self </span>{ |
| private_scalar, |
| private_prefix: private_prefix.try_into().unwrap(), |
| public_key: PublicKey(a.into_encoded_point()), |
| } |
| } |
| |
| <span class="doccomment">/// Returns the signature of the message `msg`. |
| </span><span class="kw">pub fn </span>sign(<span class="kw-2">&</span><span class="self">self</span>, msg: <span class="kw-2">&</span>[u8]) -> signature::Signature { |
| signature::Signature::new(|signature_bytes| { |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_x25519_sc_muladd( |
| s: <span class="kw-2">&mut </span>[u8; SCALAR_LEN], |
| a: <span class="kw-2">&</span>Scalar, |
| b: <span class="kw-2">&</span>Scalar, |
| c: <span class="kw-2">&</span>Scalar, |
| ); |
| } |
| |
| <span class="kw">let </span>(signature_bytes, _unused) = signature_bytes.split_at_mut(ELEM_LEN + SCALAR_LEN); |
| <span class="kw">let </span>(signature_r, signature_s) = signature_bytes.split_at_mut(ELEM_LEN); |
| <span class="kw">let </span>nonce = { |
| <span class="kw">let </span><span class="kw-2">mut </span>ctx = digest::Context::new(<span class="kw-2">&</span>digest::SHA512); |
| ctx.update(<span class="kw-2">&</span><span class="self">self</span>.private_prefix); |
| ctx.update(msg); |
| ctx.finish() |
| }; |
| <span class="kw">let </span>nonce = Scalar::from_sha512_digest_reduced(nonce); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>r = ExtPoint::new_at_infinity(); |
| <span class="kw">unsafe </span>{ |
| GFp_x25519_ge_scalarmult_base(<span class="kw-2">&mut </span>r, <span class="kw-2">&</span>nonce); |
| } |
| signature_r.copy_from_slice(<span class="kw-2">&</span>r.into_encoded_point()); |
| <span class="kw">let </span>hram_digest = eddsa_digest(signature_r, <span class="kw-2">&</span><span class="self">self</span>.public_key.as_ref(), msg); |
| <span class="kw">let </span>hram = Scalar::from_sha512_digest_reduced(hram_digest); |
| <span class="kw">unsafe </span>{ |
| GFp_x25519_sc_muladd( |
| signature_s.try_into().unwrap(), |
| <span class="kw-2">&</span>hram, |
| <span class="kw-2">&</span><span class="self">self</span>.private_scalar, |
| <span class="kw-2">&</span>nonce, |
| ); |
| } |
| |
| SIGNATURE_LEN |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>signature::KeyPair <span class="kw">for </span>Ed25519KeyPair { |
| <span class="kw">type </span>PublicKey = PublicKey; |
| |
| <span class="kw">fn </span>public_key(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::PublicKey { |
| <span class="kw-2">&</span><span class="self">self</span>.public_key |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone, Copy)] |
| </span><span class="kw">pub struct </span>PublicKey([u8; ED25519_PUBLIC_KEY_LEN]); |
| |
| <span class="kw">impl </span>AsRef<[u8]> <span class="kw">for </span>PublicKey { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.<span class="number">0</span>.as_ref() |
| } |
| } |
| |
| <span class="macro">derive_debug_self_as_ref_hex_bytes!</span>(PublicKey); |
| |
| <span class="kw">fn </span>unwrap_pkcs8( |
| version: pkcs8::Version, |
| input: untrusted::Input, |
| ) -> <span class="prelude-ty">Result</span><(untrusted::Input, <span class="prelude-ty">Option</span><untrusted::Input>), error::KeyRejected> { |
| <span class="kw">let </span>(private_key, public_key) = pkcs8::unwrap_key(<span class="kw-2">&</span>PKCS8_TEMPLATE, version, input)<span class="question-mark">?</span>; |
| <span class="kw">let </span>private_key = private_key |
| .read_all(error::Unspecified, |input| { |
| der::expect_tag_and_get_value(input, der::Tag::OctetString) |
| }) |
| .map_err(|error::Unspecified| error::KeyRejected::invalid_encoding())<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((private_key, public_key)) |
| } |
| |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_x25519_ge_scalarmult_base(h: <span class="kw-2">&mut </span>ExtPoint, a: <span class="kw-2">&</span>Scalar); |
| } |
| |
| <span class="kw">type </span>Prefix = [u8; PREFIX_LEN]; |
| <span class="kw">const </span>PREFIX_LEN: usize = digest::SHA512_OUTPUT_LEN - SCALAR_LEN; |
| |
| <span class="kw">const </span>SIGNATURE_LEN: usize = ELEM_LEN + SCALAR_LEN; |
| |
| <span class="kw">type </span>Seed = [u8; SEED_LEN]; |
| <span class="kw">const </span>SEED_LEN: usize = <span class="number">32</span>; |
| |
| <span class="kw">static </span>PKCS8_TEMPLATE: pkcs8::Template = pkcs8::Template { |
| bytes: <span class="macro">include_bytes!</span>(<span class="string">"ed25519_pkcs8_v2_template.der"</span>), |
| alg_id_range: core::ops::Range { start: <span class="number">7</span>, end: <span class="number">12 </span>}, |
| curve_id_index: <span class="number">0</span>, |
| private_key_index: <span class="number">0x10</span>, |
| }; |
| </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> |
