| <!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/suite_b/ops/elem.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>elem.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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| </pre><pre class="rust"><code><span class="comment">// Copyright 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="kw">use crate</span>::{ |
| arithmetic::montgomery::{Encoding, ProductEncoding}, |
| limb::{Limb, LIMB_BITS}, |
| }; |
| <span class="kw">use </span>core::marker::PhantomData; |
| |
| <span class="doccomment">/// Elements of ℤ/mℤ for some modulus *m*. Elements are always fully reduced |
| /// with respect to *m*; i.e. the 0 <= x < m for every value x. |
| </span><span class="attribute">#[derive(Clone, Copy)] |
| </span><span class="kw">pub struct </span>Elem<M, E: Encoding> { |
| <span class="comment">// XXX: pub |
| </span><span class="kw">pub </span>limbs: [Limb; MAX_LIMBS], |
| |
| <span class="doccomment">/// The modulus *m* for the ring ℤ/mℤ for which this element is a value. |
| </span><span class="kw">pub </span>m: PhantomData<M>, |
| |
| <span class="doccomment">/// The number of Montgomery factors that need to be canceled out from |
| /// `value` to get the actual value. |
| </span><span class="kw">pub </span>encoding: PhantomData<E>, |
| } |
| |
| <span class="kw">impl</span><M, E: Encoding> Elem<M, E> { |
| <span class="comment">// There's no need to convert `value` to the Montgomery domain since |
| // 0 * R**2 (mod m) == 0, so neither the modulus nor the encoding are needed |
| // as inputs for constructing a zero-valued element. |
| </span><span class="kw">pub fn </span>zero() -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| limbs: [<span class="number">0</span>; MAX_LIMBS], |
| m: PhantomData, |
| encoding: PhantomData, |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>mul_mont<M, EA: Encoding, EB: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb, b: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&</span>Elem<M, EA>, |
| b: <span class="kw-2">&</span>Elem<M, EB>, |
| ) -> Elem<M, <(EA, EB) <span class="kw">as </span>ProductEncoding>::Output> |
| <span class="kw">where |
| </span>(EA, EB): ProductEncoding, |
| { |
| binary_op(f, a, b) |
| } |
| |
| <span class="comment">// let r = f(a, b); return r; |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>binary_op<M, EA: Encoding, EB: Encoding, ER: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb, b: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&</span>Elem<M, EA>, |
| b: <span class="kw-2">&</span>Elem<M, EB>, |
| ) -> Elem<M, ER> { |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Elem { |
| limbs: [<span class="number">0</span>; MAX_LIMBS], |
| m: PhantomData, |
| encoding: PhantomData, |
| }; |
| <span class="kw">unsafe </span>{ f(r.limbs.as_mut_ptr(), a.limbs.as_ptr(), b.limbs.as_ptr()) } |
| r |
| } |
| |
| <span class="comment">// a := f(a, b); |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>binary_op_assign<M, EA: Encoding, EB: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb, b: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&mut </span>Elem<M, EA>, |
| b: <span class="kw-2">&</span>Elem<M, EB>, |
| ) { |
| <span class="kw">unsafe </span>{ f(a.limbs.as_mut_ptr(), a.limbs.as_ptr(), b.limbs.as_ptr()) } |
| } |
| |
| <span class="comment">// let r = f(a); return r; |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>unary_op<M, E: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&</span>Elem<M, E>, |
| ) -> Elem<M, E> { |
| <span class="kw">let </span><span class="kw-2">mut </span>r = Elem { |
| limbs: [<span class="number">0</span>; MAX_LIMBS], |
| m: PhantomData, |
| encoding: PhantomData, |
| }; |
| <span class="kw">unsafe </span>{ f(r.limbs.as_mut_ptr(), a.limbs.as_ptr()) } |
| r |
| } |
| |
| <span class="comment">// a := f(a); |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>unary_op_assign<M, E: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&mut </span>Elem<M, E>, |
| ) { |
| <span class="kw">unsafe </span>{ f(a.limbs.as_mut_ptr(), a.limbs.as_ptr()) } |
| } |
| |
| <span class="comment">// a := f(a, a); |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>unary_op_from_binary_op_assign<M, E: Encoding>( |
| f: <span class="kw">unsafe extern </span><span class="string">"C" </span><span class="kw">fn</span>(r: <span class="kw-2">*mut </span>Limb, a: <span class="kw-2">*const </span>Limb, b: <span class="kw-2">*const </span>Limb), |
| a: <span class="kw-2">&mut </span>Elem<M, E>, |
| ) { |
| <span class="kw">unsafe </span>{ f(a.limbs.as_mut_ptr(), a.limbs.as_ptr(), a.limbs.as_ptr()) } |
| } |
| |
| <span class="kw">pub const </span>MAX_LIMBS: usize = (<span class="number">384 </span>+ (LIMB_BITS - <span class="number">1</span>)) / LIMB_BITS; |
| </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> |
