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+<title>Crypto.sha256 — Ludic</title>
+<meta name="description" content="SHA-256 of a string, as 64 hex characters.">
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-crypto.html">Crypto</a> <span>›</span> <span class="here">Crypto.sha256</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-method">method</span>
+    <h1 id="top">Crypto.sha256</h1>
+  </div>
+  <code class="sig">Crypto.sha256(s) -&gt; string</code>
+  <div class="desc"><p>Computes the SHA-256 digest of the bytes of <code>s</code> and returns it as a 64-character lowercase hex string. This is the standard, FIPS 180-4 algorithm — the same digest every other conforming implementation produces — so it is deterministic across platforms and runs and is backed by published known-answer vectors. Use it to fingerprint content, or as the building block under <a href="crypto-hmac_sha256"><code>Crypto.hmac_sha256</code></a> for signing. On its own SHA-256 is <em>not</em> a message authentication code: anyone can recompute it, so it proves what the data is, not who produced it.</p></div>
+  <div class="params"><h2>Parameters</h2><div class="param" id="param-s"><code class="pname">s</code><span class="pdesc">the string whose bytes are hashed</span></div></div>
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Fingerprint {
+  entry {
+    let digest = Crypto.sha256("abc")
+    print(digest)   # ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
+  }
+}</pre></div>
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