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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Profile PIN: hashing, and the lockout policy that decides what a guess costs."><title>jellytau_lib::profiles::pin - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="jellytau_lib" data-themes="" data-resource-suffix="" data-rustdoc-version="1.97.1 (8bab26f4f 2026-07-14)" data-channel="1.97.1" data-search-js="search-fd9372ac.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-fcd733ba.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module pin</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../jellytau_lib/index.html">jellytau_<wbr>lib</a><span class="version">0.11.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module pin</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#enums" title="Enums">Enums</a></li><li><a href="#constants" title="Constants">Constants</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In jellytau_<wbr>lib::<wbr>profiles</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">jellytau_lib</a>::<wbr><a href="../index.html">profiles</a></div><h1>Module <span>pin</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/jellytau_lib/profiles/pin.rs.html#1-290">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Profile PIN: hashing, and the lockout policy that decides what a guess costs.</p>
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<p>The policy half is deliberately pure — it takes the stored counter state and
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the current time, and returns the decision plus the next state. That is what
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makes “five wrong guesses then a lockout that survives a restart” testable
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without a database, a clock, or a running app.</p>
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<p>What this is <em>not</em>: at-rest protection. The PIN gates switching to a profile;
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it does not encrypt that profile’s access token, so anyone holding the
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database and the keyring has every token regardless. That trade is deliberate
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and its reasoning lives in DR-268 — a wrapped token would leave a locked
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profile unable to resume its own downloads or drain its own sync queue until
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somebody walked past and typed the code.</p>
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<p>TRACES: UR-083 | DR-268</p>
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</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.PinState.html" title="struct jellytau_lib::profiles::pin::PinState">PinState</a></dt><dd>Persisted counter state for one profile’s PIN.</dd></dl><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><dl class="item-table"><dt><a class="enum" href="enum.PinDecision.html" title="enum jellytau_lib::profiles::pin::PinDecision">PinDecision</a></dt><dd>What the caller should do with an attempt.</dd></dl><h2 id="constants" class="section-header">Constants<a href="#constants" class="anchor">§</a></h2><dl class="item-table"><dt><a class="constant" href="constant.BASE_LOCKOUT_SECS.html" title="constant jellytau_lib::profiles::pin::BASE_LOCKOUT_SECS">BASE_<wbr>LOCKOUT_<wbr>SECS</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>How long the first lockout lasts. Each subsequent failure doubles it.</dd><dt><a class="constant" href="constant.MAX_ATTEMPTS.html" title="constant jellytau_lib::profiles::pin::MAX_ATTEMPTS">MAX_<wbr>ATTEMPTS</a></dt><dd>Wrong guesses allowed before the first lockout.</dd><dt><a class="constant" href="constant.MAX_LOCKOUT_SECS.html" title="constant jellytau_lib::profiles::pin::MAX_LOCKOUT_SECS">MAX_<wbr>LOCKOUT_<wbr>SECS</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Ceiling on the doubling, so a forgotten PIN never bricks the tile — the
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password route is always there, and a lockout measured in hours would push
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people towards not setting a PIN at all.</dd></dl><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.evaluate.html" title="fn jellytau_lib::profiles::pin::evaluate">evaluate</a></dt><dd>Decide an attempt and produce the state to persist.</dd><dt><a class="fn" href="fn.hash_pin.html" title="fn jellytau_lib::profiles::pin::hash_pin">hash_<wbr>pin</a></dt><dd>Hash a PIN for storage. Returns a PHC string with the salt embedded.</dd><dt><a class="fn" href="fn.validate_pin.html" title="fn jellytau_lib::profiles::pin::validate_pin">validate_<wbr>pin</a></dt><dd>A PIN must be 4–8 digits. Rejecting non-digits here rather than in the pad
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keeps the rule where the rule is enforced.</dd><dt><a class="fn" href="fn.verify_pin.html" title="fn jellytau_lib::profiles::pin::verify_pin">verify_<wbr>pin</a></dt><dd>Compare a candidate PIN against a stored PHC string.</dd></dl></section></div></main></body></html>
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