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<p class='location'><a href='../index.html'>crypto</a>::<wbr><a href='index.html'>sha1</a></p><script>window.sidebarCurrent = {name: 'sha1_digest_block', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>crypto</a>::<wbr><a href='index.html'>sha1</a>::<wbr><a class="fn" href=''>sha1_digest_block</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/crypto/sha1.rs.html#348-353' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn sha1_digest_block(state: &mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 5]</a>, block: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>)</pre><div class='docblock'><p>Process a block with the SHA-1 algorithm. (See more...)</p>
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<p>SHA-1 is a cryptographic hash function, and as such, it operates
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on an arbitrary number of bytes. This function operates on a fixed
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number of bytes. If you call this function with anything other than
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64 bytes, then it will panic! This function takes two arguments:</p>
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<ul>
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<li><code>state</code> is reference to an <strong>array</strong> of 5 words.</li>
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<li><code>block</code> is reference to a <strong>slice</strong> of 64 bytes.</li>
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</ul>
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<p>If you want the function that performs a message digest on an arbitrary
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number of bytes, then see also the <code>Sha1</code> struct above.</p>
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<h1 id='implementation' class='section-header'><a href='#implementation'>Implementation</a></h1>
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<p>First, some background. Both ARM and Intel are releasing documentation
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that they plan to include instruction set extensions for SHA1 and SHA256
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sometime in the near future. Second, LLVM won't lower these intrinsics yet,
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so these functions were written emulate these instructions. Finally,
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the block function implemented with these emulated intrinsics turned out
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to be quite fast! What follows is a discussion of this CPU-level view
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of the SHA-1 algorithm and how it relates to the mathematical definition.</p>
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<p>The SHA instruction set extensions can be divided up into two categories:</p>
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<ul>
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<li>message work schedule update calculation ("schedule" v., "work" n.)</li>
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<li>message block 80-round digest calculation ("digest" v., "block" n.)</li>
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</ul>
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<p>The schedule-related functions can be used to easily perform 4 rounds
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of the message work schedule update calculation, as shown below:</p>
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<pre class="rust rust-example-rendered">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">schedule_x4</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v0</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v1</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v2</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v3</span>:<span class="ident">expr</span>) <span class="op">=></span> (
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<span class="ident">sha1msg2</span>(<span class="ident">sha1msg1</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">v0</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v1</span>) <span class="op">^</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v2</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">v3</span>)
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)
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}
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">round_x4</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">h0</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">h1</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">wk</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>) <span class="op">=></span> (
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<span class="ident">sha1rnds4</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">h0</span>, <span class="ident">sha1_first_half</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">h1</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">wk</span>), <span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>)
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)
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}</pre>
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<p>and also shown above is how the digest-related functions can be used to
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perform 4 rounds of the message block digest calculation.</p>
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