| <!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/curve25519/ops.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ops.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">//! Elliptic curve operations on the birationally equivalent curves Curve25519 |
| //! and Edwards25519. |
| |
| </span><span class="kw">pub use </span><span class="kw">super</span>::scalar::{MaskedScalar, Scalar, SCALAR_LEN}; |
| <span class="kw">use crate</span>::{ |
| bssl, error, |
| limb::{Limb, LIMB_BITS}, |
| }; |
| <span class="kw">use </span>core::marker::PhantomData; |
| |
| <span class="comment">// Elem<T>` is `fe` in curve25519/internal.h. |
| // Elem<L> is `fe_loose` in curve25519/internal.h. |
| // Keep this in sync with curve25519/internal.h. |
| </span><span class="attribute">#[repr(C)] |
| </span><span class="kw">pub struct </span>Elem<E: Encoding> { |
| limbs: [Limb; ELEM_LIMBS], <span class="comment">// This is called `v` in the C code. |
| </span>encoding: PhantomData<E>, |
| } |
| |
| <span class="kw">pub trait </span>Encoding {} |
| <span class="kw">pub struct </span>T; |
| <span class="kw">impl </span>Encoding <span class="kw">for </span>T {} |
| |
| <span class="kw">const </span>ELEM_LIMBS: usize = <span class="number">5 </span>* <span class="number">64 </span>/ LIMB_BITS; |
| |
| <span class="kw">impl</span><E: Encoding> Elem<E> { |
| <span class="kw">fn </span>zero() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| limbs: Default::default(), |
| encoding: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Elem<T> { |
| <span class="kw">fn </span>negate(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">unsafe </span>{ |
| GFp_x25519_fe_neg(<span class="self">self</span>); |
| } |
| } |
| } |
| |
| <span class="comment">// An encoding of a curve point. If on Curve25519, it should be encoded as |
| // described in Section 5 of [RFC 7748]. If on Edwards25519, it should be |
| // encoded as described in section 5.1.2 of [RFC 8032]. |
| // |
| // [RFC 7748] https://tools.ietf.org/html/rfc7748#section-5 |
| // [RFC 8032] https://tools.ietf.org/html/rfc8032#section-5.1.2 |
| </span><span class="kw">pub type </span>EncodedPoint = [u8; ELEM_LEN]; |
| <span class="kw">pub const </span>ELEM_LEN: usize = <span class="number">32</span>; |
| |
| <span class="comment">// Keep this in sync with `ge_p3` in curve25519/internal.h. |
| </span><span class="attribute">#[repr(C)] |
| </span><span class="kw">pub struct </span>ExtPoint { |
| x: Elem<T>, |
| y: Elem<T>, |
| z: Elem<T>, |
| t: Elem<T>, |
| } |
| |
| <span class="kw">impl </span>ExtPoint { |
| <span class="kw">pub fn </span>new_at_infinity() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| x: Elem::zero(), |
| y: Elem::zero(), |
| z: Elem::zero(), |
| t: Elem::zero(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>from_encoded_point_vartime(encoded: <span class="kw-2">&</span>EncodedPoint) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, error::Unspecified> { |
| <span class="kw">let </span><span class="kw-2">mut </span>point = <span class="self">Self</span>::new_at_infinity(); |
| |
| Result::from(<span class="kw">unsafe </span>{ GFp_x25519_ge_frombytes_vartime(<span class="kw-2">&mut </span>point, encoded) }) |
| .map(|()| point) |
| } |
| |
| <span class="kw">pub fn </span>into_encoded_point(<span class="self">self</span>) -> EncodedPoint { |
| encode_point(<span class="self">self</span>.x, <span class="self">self</span>.y, <span class="self">self</span>.z) |
| } |
| |
| <span class="kw">pub fn </span>invert_vartime(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.x.negate(); |
| <span class="self">self</span>.t.negate(); |
| } |
| } |
| |
| <span class="comment">// Keep this in sync with `ge_p2` in curve25519/internal.h. |
| </span><span class="attribute">#[repr(C)] |
| </span><span class="kw">pub struct </span>Point { |
| x: Elem<T>, |
| y: Elem<T>, |
| z: Elem<T>, |
| } |
| |
| <span class="kw">impl </span>Point { |
| <span class="kw">pub fn </span>new_at_infinity() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| x: Elem::zero(), |
| y: Elem::zero(), |
| z: Elem::zero(), |
| } |
| } |
| |
| <span class="kw">pub fn </span>into_encoded_point(<span class="self">self</span>) -> EncodedPoint { |
| encode_point(<span class="self">self</span>.x, <span class="self">self</span>.y, <span class="self">self</span>.z) |
| } |
| } |
| |
| <span class="kw">fn </span>encode_point(x: Elem<T>, y: Elem<T>, z: Elem<T>) -> EncodedPoint { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = [<span class="number">0</span>; ELEM_LEN]; |
| |
| <span class="kw">let </span>sign_bit: u8 = <span class="kw">unsafe </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>recip = Elem::zero(); |
| GFp_x25519_fe_invert(<span class="kw-2">&mut </span>recip, <span class="kw-2">&</span>z); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>x_over_z = Elem::zero(); |
| GFp_x25519_fe_mul_ttt(<span class="kw-2">&mut </span>x_over_z, <span class="kw-2">&</span>x, <span class="kw-2">&</span>recip); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>y_over_z = Elem::zero(); |
| GFp_x25519_fe_mul_ttt(<span class="kw-2">&mut </span>y_over_z, <span class="kw-2">&</span>y, <span class="kw-2">&</span>recip); |
| GFp_x25519_fe_tobytes(<span class="kw-2">&mut </span>bytes, <span class="kw-2">&</span>y_over_z); |
| |
| GFp_x25519_fe_isnegative(<span class="kw-2">&</span>x_over_z) |
| }; |
| |
| <span class="comment">// The preceding computations must execute in constant time, but this |
| // doesn't need to. |
| </span>bytes[ELEM_LEN - <span class="number">1</span>] ^= sign_bit << <span class="number">7</span>; |
| |
| bytes |
| } |
| |
| <span class="kw">extern </span><span class="string">"C" </span>{ |
| <span class="kw">fn </span>GFp_x25519_fe_invert(out: <span class="kw-2">&mut </span>Elem<T>, z: <span class="kw-2">&</span>Elem<T>); |
| <span class="kw">fn </span>GFp_x25519_fe_isnegative(elem: <span class="kw-2">&</span>Elem<T>) -> u8; |
| <span class="kw">fn </span>GFp_x25519_fe_mul_ttt(h: <span class="kw-2">&mut </span>Elem<T>, f: <span class="kw-2">&</span>Elem<T>, g: <span class="kw-2">&</span>Elem<T>); |
| <span class="kw">fn </span>GFp_x25519_fe_neg(f: <span class="kw-2">&mut </span>Elem<T>); |
| <span class="kw">fn </span>GFp_x25519_fe_tobytes(bytes: <span class="kw-2">&mut </span>EncodedPoint, elem: <span class="kw-2">&</span>Elem<T>); |
| <span class="kw">fn </span>GFp_x25519_ge_frombytes_vartime(h: <span class="kw-2">&mut </span>ExtPoint, s: <span class="kw-2">&</span>EncodedPoint) -> bssl::Result; |
| } |
| </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> |
