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<p class='location'><a href='../index.html'>crypto</a>::<wbr><a href='index.html'>sha2</a></p><script>window.sidebarCurrent = {name: 'sha512_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'>sha2</a>::<wbr><a class="fn" href=''>sha512_digest_block</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/crypto/sha2.rs.html#638-643' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn sha512_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.u64.html">u64</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">; 8]</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-512 algorithm. (See more...)</p>
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<p>Internally, this uses functions that resemble the new Intel SHA
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instruction set extensions, but since no architecture seems to
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have any designs, these may not be the final designs if and/or when
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there are instruction set extensions with SHA-512. So to summarize:
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SHA-1 and SHA-256 are being implemented in hardware soon (at the time
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of this writing), but it doesn't look like SHA-512 will be hardware
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accelerated any time soon.</p>
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<h1 id='implementation' class='section-header'><a href='#implementation'>Implementation</a></h1>
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<p>These functions fall into two categories:
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message schedule calculation, and the message block 64-round digest calculation.
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The schedule-related functions allow 4 rounds to be calculated as:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">simd</span>::<span class="ident">u64x2</span>;
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<span class="kw">use</span> <span class="self">self</span>::<span class="ident">crypto</span>::<span class="ident">sha2</span>::{
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<span class="ident">sha512msg</span>,
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<span class="ident">sha512load</span>
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};
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<span class="kw">fn</span> <span class="ident">schedule4_data</span>(<span class="ident">work</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64x2</span>], <span class="ident">w</span>: <span class="kw-2">&</span>[<span class="ident">u64</span>]) {
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<span class="comment">// this is to illustrate the data order</span>
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<span class="ident">work</span>[<span class="number">0</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">1</span>], <span class="ident">w</span>[<span class="number">0</span>]);
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<span class="ident">work</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">3</span>], <span class="ident">w</span>[<span class="number">2</span>]);
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<span class="ident">work</span>[<span class="number">2</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">5</span>], <span class="ident">w</span>[<span class="number">4</span>]);
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<span class="ident">work</span>[<span class="number">3</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">7</span>], <span class="ident">w</span>[<span class="number">6</span>]);
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<span class="ident">work</span>[<span class="number">4</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">9</span>], <span class="ident">w</span>[<span class="number">8</span>]);
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<span class="ident">work</span>[<span class="number">5</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">11</span>], <span class="ident">w</span>[<span class="number">10</span>]);
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<span class="ident">work</span>[<span class="number">6</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">13</span>], <span class="ident">w</span>[<span class="number">12</span>]);
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<span class="ident">work</span>[<span class="number">7</span>] <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">w</span>[<span class="number">15</span>], <span class="ident">w</span>[<span class="number">14</span>]);
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}
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<span class="kw">fn</span> <span class="ident">schedule4_work</span>(<span class="ident">work</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64x2</span>], <span class="ident">t</span>: <span class="ident">usize</span>) {
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<span class="comment">// this is the core expression</span>
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<span class="ident">work</span>[<span class="ident">t</span>] <span class="op">=</span> <span class="ident">sha512msg</span>(<span class="ident">work</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">8</span>],
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<span class="ident">work</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">7</span>],
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<span class="ident">sha512load</span>(<span class="ident">work</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">4</span>], <span class="ident">work</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">3</span>]),
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<span class="ident">work</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">1</span>]);
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}</pre>
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<p>instead of 4 rounds of:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">schedule_work</span>(<span class="ident">w</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64</span>], <span class="ident">t</span>: <span class="ident">usize</span>) {
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<span class="ident">w</span>[<span class="ident">t</span>] <span class="op">=</span> <span class="macro">sigma1</span><span class="macro">!</span>(<span class="ident">w</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">2</span>]) <span class="op">+</span> <span class="ident">w</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">7</span>] <span class="op">+</span> <span class="macro">sigma0</span><span class="macro">!</span>(<span class="ident">w</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">15</span>]) <span class="op">+</span> <span class="ident">w</span>[<span class="ident">t</span> <span class="op">-</span> <span class="number">16</span>];
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}</pre>
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<p>and the digest-related functions allow 4 rounds to be calculated as:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">simd</span>::<span class="ident">u64x2</span>;
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<span class="kw">use</span> <span class="self">self</span>::<span class="ident">crypto</span>::<span class="ident">sha2</span>::{<span class="ident">K64X2</span>, <span class="ident">sha512rnd</span>};
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<span class="kw">fn</span> <span class="ident">rounds4</span>(<span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64</span>; <span class="number">8</span>], <span class="ident">work</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64x2</span>], <span class="ident">t</span>: <span class="ident">usize</span>) {
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<span class="kw">let</span> [<span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>, <span class="ident">d</span>, <span class="ident">e</span>, <span class="ident">f</span>, <span class="ident">g</span>, <span class="ident">h</span>]: [<span class="ident">u64</span>; <span class="number">8</span>] <span class="op">=</span> <span class="kw-2">*</span><span class="ident">state</span>;
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<span class="comment">// this is to illustrate the data order</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ae</span> <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">a</span>, <span class="ident">e</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">bf</span> <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">b</span>, <span class="ident">f</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cg</span> <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">c</span>, <span class="ident">g</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">dh</span> <span class="op">=</span> <span class="ident">u64x2</span>(<span class="ident">d</span>, <span class="ident">h</span>);
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<span class="kw">let</span> <span class="ident">u64x2</span>(<span class="ident">w1</span>, <span class="ident">w0</span>) <span class="op">=</span> <span class="ident">K64X2</span>[<span class="number">2</span><span class="kw-2">*</span><span class="ident">t</span>] <span class="op">+</span> <span class="ident">work</span>[<span class="number">2</span><span class="kw-2">*</span><span class="ident">t</span>];
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<span class="kw">let</span> <span class="ident">u64x2</span>(<span class="ident">w3</span>, <span class="ident">w2</span>) <span class="op">=</span> <span class="ident">K64X2</span>[<span class="number">2</span><span class="kw-2">*</span><span class="ident">t</span> <span class="op">+</span> <span class="number">1</span>] <span class="op">+</span> <span class="ident">work</span>[<span class="number">2</span><span class="kw-2">*</span><span class="ident">t</span> <span class="op">+</span> <span class="number">1</span>];
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<span class="comment">// this is the core expression</span>
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<span class="ident">dh</span> <span class="op">=</span> <span class="ident">sha512rnd</span>(<span class="ident">ae</span>, <span class="ident">bf</span>, <span class="ident">cg</span>, <span class="ident">dh</span>, <span class="ident">w0</span>);
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<span class="ident">cg</span> <span class="op">=</span> <span class="ident">sha512rnd</span>(<span class="ident">dh</span>, <span class="ident">ae</span>, <span class="ident">bf</span>, <span class="ident">cg</span>, <span class="ident">w1</span>);
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<span class="ident">bf</span> <span class="op">=</span> <span class="ident">sha512rnd</span>(<span class="ident">cg</span>, <span class="ident">dh</span>, <span class="ident">ae</span>, <span class="ident">bf</span>, <span class="ident">w2</span>);
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<span class="ident">ae</span> <span class="op">=</span> <span class="ident">sha512rnd</span>(<span class="ident">bf</span>, <span class="ident">cg</span>, <span class="ident">dh</span>, <span class="ident">ae</span>, <span class="ident">w3</span>);
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<span class="kw-2">*</span><span class="ident">state</span> <span class="op">=</span> [<span class="ident">ae</span>.<span class="number">0</span>, <span class="ident">bf</span>.<span class="number">0</span>, <span class="ident">cg</span>.<span class="number">0</span>, <span class="ident">dh</span>.<span class="number">0</span>,
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<span class="ident">ae</span>.<span class="number">1</span>, <span class="ident">bf</span>.<span class="number">1</span>, <span class="ident">cg</span>.<span class="number">1</span>, <span class="ident">dh</span>.<span class="number">1</span>];
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}</pre>
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<p>instead of 4 rounds of:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">round</span>(<span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64</span>; <span class="number">8</span>], <span class="ident">w</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u64</span>], <span class="ident">t</span>: <span class="ident">usize</span>) {
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<span class="kw">let</span> [<span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>, <span class="kw-2">mut</span> <span class="ident">d</span>, <span class="ident">e</span>, <span class="ident">f</span>, <span class="ident">g</span>, <span class="kw-2">mut</span> <span class="ident">h</span>]: [<span class="ident">u64</span>; <span class="number">8</span>] <span class="op">=</span> <span class="kw-2">*</span><span class="ident">state</span>;
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<span class="ident">h</span> <span class="op">+=</span> <span class="macro">big_sigma1</span><span class="macro">!</span>(<span class="ident">e</span>) <span class="op">+</span> <span class="macro">choose</span><span class="macro">!</span>(<span class="ident">e</span>, <span class="ident">f</span>, <span class="ident">g</span>) <span class="op">+</span> <span class="ident">K64</span>[<span class="ident">t</span>] <span class="op">+</span> <span class="ident">w</span>[<span class="ident">t</span>]; <span class="ident">d</span> <span class="op">+=</span> <span class="ident">h</span>;
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<span class="ident">h</span> <span class="op">+=</span> <span class="macro">big_sigma0</span><span class="macro">!</span>(<span class="ident">a</span>) <span class="op">+</span> <span class="macro">majority</span><span class="macro">!</span>(<span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>);
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<span class="kw-2">*</span><span class="ident">state</span> <span class="op">=</span> [<span class="ident">h</span>, <span class="ident">a</span>, <span class="ident">b</span>, <span class="ident">c</span>, <span class="ident">d</span>, <span class="ident">e</span>, <span class="ident">f</span>, <span class="ident">g</span>];
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