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<meta name="description" content="Sign a message with a shared secret key.">
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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.hmac_sha256</span></div>
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<span class="kind-badge kind-method">method</span>
<h1 id="top">Crypto.hmac_sha256</h1>
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<code class="sig">Crypto.hmac_sha256(key, msg) -&gt; string</code>
<div class="desc"><p>Computes HMAC-SHA256 over <code>msg</code> under the secret <code>key</code> (RFC 2104) and returns the 64-character lowercase hex tag. Unlike a bare hash, a MAC cannot be recomputed without the key, so it authenticates the message: attach the tag to a save file or a network packet, and a receiver who shares the key can tell whether the payload was altered or forged. To check the tag on the other side, pass it to <a href="crypto-verify_hmac"><code>Crypto.verify_hmac</code></a> rather than comparing hex with <code>==</code>.</p></div>
<div class="params"><h2>Parameters</h2><div class="param" id="param-key"><code class="pname">key</code><span class="pdesc">the shared secret; keep it out of the shipped client where you can</span></div><div class="param" id="param-msg"><code class="pname">msg</code><span class="pdesc">the payload being signed</span></div></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program SignSave {
entry {
let key = "s3cret"
let payload = "score=9001;level=12"
let mac = Crypto.hmac_sha256(key, payload)
print(mac)
}
}</pre></div>
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