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<meta name="description" content="API documentation for the Rust `sha1` mod in crate `crypto`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, sha1">
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<title>crypto::sha1 - Rust</title>
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<nav class="sidebar">
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<p class='location'>Module sha1</p><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'><a href='../index.html'>crypto</a></p><script>window.sidebarCurrent = {name: 'sha1', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>crypto</a>::<wbr><a class="mod" href=''>sha1</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/crypto/sha1.rs.html#11-581' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>An implementation of the SHA-1 cryptographic hash algorithm.</p>
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<p>To use this module, first create a <code>Sha1</code> object using the <code>Sha1</code> constructor,
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then feed it an input message using the <code>input</code> or <code>input_str</code> methods,
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which may be called any number of times; they will buffer the input until
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there is enough to call the block algorithm.</p>
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<p>After the entire input has been fed to the hash read the result using
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the <code>result</code> or <code>result_str</code> methods. The first will return bytes, and
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the second will return a <code>String</code> object of the same bytes represented
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in hexadecimal form.</p>
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<p>The <code>Sha1</code> object may be reused to create multiple hashes by calling
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the <code>reset()</code> method. These traits are implemented by all hash digest
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algorithms that implement the <code>Digest</code> trait. An example of use is:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="self">self</span>::<span class="ident">crypto</span>::<span class="ident">digest</span>::<span class="ident">Digest</span>;
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<span class="kw">use</span> <span class="self">self</span>::<span class="ident">crypto</span>::<span class="ident">sha1</span>::<span class="ident">Sha1</span>;
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<span class="comment">// create a Sha1 object</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">Sha1</span>::<span class="ident">new</span>();
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<span class="comment">// write input message</span>
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<span class="ident">hasher</span>.<span class="ident">input_str</span>(<span class="string">"hello world"</span>);
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<span class="comment">// read hash digest</span>
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<span class="kw">let</span> <span class="ident">hex</span> <span class="op">=</span> <span class="ident">hasher</span>.<span class="ident">result_str</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">hex</span>, <span class="string">"2aae6c35c94fcfb415dbe95f408b9ce91ee846ed"</span>);</pre>
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<h1 id='mathematics' class='section-header'><a href='#mathematics'>Mathematics</a></h1>
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<p>The mathematics of the SHA-1 algorithm are quite interesting. In its
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definition, The SHA-1 algorithm uses:</p>
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<ul>
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<li>1 binary operation on bit-arrays:
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<ul>
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<li>"exclusive or" (XOR)</li>
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</ul></li>
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<li>2 binary operations on integers:
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<ul>
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<li>"addition" (ADD)</li>
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<li>"rotate left" (ROL)</li>
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</ul></li>
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<li>3 ternary operations on bit-arrays:
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<ul>
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<li>"choose" (CH)</li>
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<li>"parity" (PAR)</li>
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<li>"majority" (MAJ)</li>
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</ul></li>
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</ul>
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<p>Some of these functions are commonly found in all hash digest
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algorithms, but some, like "parity" is only found in SHA-1.</p>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Sha1.html"
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title='struct crypto::sha1::Sha1'>Sha1</a></td>
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<td class='docblock-short'>
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<p>Structure representing the state of a Sha1 computation</p>
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</td>
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</tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_digest_block.html"
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title='fn crypto::sha1::sha1_digest_block'>sha1_digest_block</a></td>
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<td class='docblock-short'>
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<p>Process a block with the SHA-1 algorithm. (See more...)</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_digest_block_u32.html"
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title='fn crypto::sha1::sha1_digest_block_u32'>sha1_digest_block_u32</a></td>
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<td class='docblock-short'>
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<p>Process a block with the SHA-1 algorithm.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_digest_round_x4.html"
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title='fn crypto::sha1::sha1_digest_round_x4'>sha1_digest_round_x4</a></td>
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<td class='docblock-short'>
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<p>Emulates <code>llvm.x86.sha1rnds4</code> intrinsic.
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Performs 4 rounds of the message block digest.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_first.html"
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title='fn crypto::sha1::sha1_first'>sha1_first</a></td>
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<td class='docblock-short'>
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<p>Not an intrinsic, but gets the first element of a vector.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_first_add.html"
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title='fn crypto::sha1::sha1_first_add'>sha1_first_add</a></td>
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<td class='docblock-short'>
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<p>Not an intrinsic, but adds a word to the first element of a vector.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_first_half.html"
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title='fn crypto::sha1::sha1_first_half'>sha1_first_half</a></td>
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<td class='docblock-short'>
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<p>Emulates <code>llvm.x86.sha1nexte</code> intrinsic.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="fn" href="fn.sha1_schedule_x4.html"
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title='fn crypto::sha1::sha1_schedule_x4'>sha1_schedule_x4</a></td>
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<td class='docblock-short'>
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<p>Performs 4 rounds of the message schedule update.</p>
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</td>
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</tr></table></section>
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