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<!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="Download the Zcash Sapling parameters if needed, and store them in the default location. Always checks the sizes and hashes of the files, even if they didn’t need to be downloaded."><title>download_parameters in zcash_proofs - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-0ce1a80b.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="zcash_proofs" data-themes="" data-resource-suffix="" data-rustdoc-version="1.89.0-nightly (60dabef95 2025-05-19)" data-channel="nightly" data-search-js="search-f7877310.js" data-settings-js="settings-5514c975.js" ><script src="../static.files/storage-4e99c027.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-7ef8a74a.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../zcash_proofs/index.html">zcash_<wbr>proofs</a><span class="version">0.22.0</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">zcash_proofs</a></div><h1>Function <span class="fn">download_parameters</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/zcash_proofs/lib.rs.html#108-110">Source</a> </span></div><pre class="rust item-decl"><code>pub fn download_parameters() -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error></code></pre><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.6.0: please replace with <code>download_sapling_parameters</code>, and use <code>download_sprout_parameters</code> if needed</span></div><div class="stab portability">Available on <strong>crate feature <code>download-params</code></strong> only.</div></span><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Download the Zcash Sapling parameters if needed, and store them in the default location.
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Always checks the sizes and hashes of the files, even if they didn’t need to be downloaded.</p>
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<p>A download timeout can be set using the <code>MINREQ_TIMEOUT</code> environmental variable.</p>
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<p>This mirrors the behaviour of the <code>fetch-params.sh</code> script from <code>zcashd</code>.</p>
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