67 lines
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67 lines
7.5 KiB
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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="The message digest context."><title>openssl::md_ctx - 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"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="openssl" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module md_ctx</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../openssl/index.html">openssl</a><span class="version">0.10.75</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module md_ctx</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate openssl</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">openssl</a></div><h1>Module <span>md_ctx</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/openssl/md_ctx.rs.html#1-552">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The message digest context.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>Compute the SHA256 checksum of data</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>openssl::md::Md;
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<span class="kw">use </span>openssl::md_ctx::MdCtx;
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<span class="kw">let </span><span class="kw-2">mut </span>ctx = MdCtx::new().unwrap();
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ctx.digest_init(Md::sha256()).unwrap();
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ctx.digest_update(<span class="string">b"Some Crypto Text"</span>).unwrap();
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<span class="kw">let </span><span class="kw-2">mut </span>digest = [<span class="number">0</span>; <span class="number">32</span>];
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ctx.digest_final(<span class="kw-2">&mut </span>digest).unwrap();
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<span class="macro">assert_eq!</span>(
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digest,
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<span class="kw-2">*</span><span class="string">b"\x60\x78\x56\x38\x8a\xca\x5c\x51\x83\xc4\xd1\x4d\xc8\xf9\xcc\xf2\
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\xa5\x21\xb3\x10\x93\x72\xfa\xd6\x7c\x55\xf5\xc9\xe3\xd1\x83\x19"</span>,
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);</code></pre></div>
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<p>Sign and verify data with RSA and SHA256</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>openssl::md::Md;
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<span class="kw">use </span>openssl::md_ctx::MdCtx;
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<span class="kw">use </span>openssl::pkey::PKey;
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<span class="kw">use </span>openssl::rsa::Rsa;
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<span class="comment">// Generate a random RSA key.
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</span><span class="kw">let </span>key = Rsa::generate(<span class="number">4096</span>).unwrap();
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<span class="kw">let </span>key = PKey::from_rsa(key).unwrap();
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<span class="kw">let </span>text = <span class="string">b"Some Crypto Text"</span>;
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<span class="comment">// Create the signature.
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</span><span class="kw">let </span><span class="kw-2">mut </span>ctx = MdCtx::new().unwrap();
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ctx.digest_sign_init(<span class="prelude-val">Some</span>(Md::sha256()), <span class="kw-2">&</span>key).unwrap();
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ctx.digest_sign_update(text).unwrap();
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<span class="kw">let </span><span class="kw-2">mut </span>signature = <span class="macro">vec!</span>[];
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ctx.digest_sign_final_to_vec(<span class="kw-2">&mut </span>signature).unwrap();
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<span class="comment">// Verify the signature.
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</span><span class="kw">let </span><span class="kw-2">mut </span>ctx = MdCtx::new().unwrap();
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ctx.digest_verify_init(<span class="prelude-val">Some</span>(Md::sha256()), <span class="kw-2">&</span>key).unwrap();
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ctx.digest_verify_update(text).unwrap();
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<span class="kw">let </span>valid = ctx.digest_verify_final(<span class="kw-2">&</span>signature).unwrap();
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<span class="macro">assert!</span>(valid);</code></pre></div>
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<p><br />
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Compute and verify an HMAC-SHA256</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>openssl::md::Md;
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<span class="kw">use </span>openssl::md_ctx::MdCtx;
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<span class="kw">use </span>openssl::memcmp;
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<span class="kw">use </span>openssl::pkey::PKey;
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<span class="comment">// Create a key with the HMAC secret.
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</span><span class="kw">let </span>key = PKey::hmac(<span class="string">b"my secret"</span>).unwrap();
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<span class="kw">let </span>text = <span class="string">b"Some Crypto Text"</span>;
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<span class="comment">// Compute the HMAC.
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</span><span class="kw">let </span><span class="kw-2">mut </span>ctx = MdCtx::new().unwrap();
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ctx.digest_sign_init(<span class="prelude-val">Some</span>(Md::sha256()), <span class="kw-2">&</span>key).unwrap();
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ctx.digest_sign_update(text).unwrap();
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<span class="kw">let </span><span class="kw-2">mut </span>hmac = <span class="macro">vec!</span>[];
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ctx.digest_sign_final_to_vec(<span class="kw-2">&mut </span>hmac).unwrap();
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<span class="comment">// Verify the HMAC. You can't use MdCtx to do this; instead use a constant time equality check.
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</span><span class="kw">let </span>valid = memcmp::eq(<span class="kw-2">&</span>hmac, <span class="kw-2">&</span>target);
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<span class="macro">assert!</span>(valid);</code></pre></div></div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.MdCtx.html" title="struct openssl::md_ctx::MdCtx">MdCtx</a></dt><dt><a class="struct" href="struct.MdCtxRef.html" title="struct openssl::md_ctx::MdCtxRef">MdCtx<wbr>Ref</a></dt><dd>A reference to an <a href="struct.MdCtx.html" title="struct openssl::md_ctx::MdCtx"><code>MdCtx</code></a>.</dd></dl></section></div></main></body></html> |