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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Codehead Systems — open source by Ned Wolpert</title>
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<meta name="description" content="An open-source workshop of cryptography, authentication, and infrastructure libraries by engineer Ned Wolpert. Featuring pk-auth, the Hofmann Elimination (OPAQUE PAKE), and a collection of JVM utilities." />
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<meta name="theme-color" content="#0B0B0D" />
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<link rel="preconnect" href="https://fonts.googleapis.com" />
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
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<link href="https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght,SOFT,WONK@0,9..144,300..900,0..100,0..1;1,9..144,300..900,0..100,0..1&family=JetBrains+Mono:ital,wght@0,300..800;1,300..800&display=swap" rel="stylesheet" />
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<link rel="stylesheet" href="styles.css" />
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</head>
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<body>
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<div class="grain" aria-hidden="true"></div>
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<div class="vignette" aria-hidden="true"></div>
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<header class="topbar">
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<a href="#top" class="topbar__brand">
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<span class="brand-mark" aria-hidden="true"></span>
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<span class="mono-tiny">CODEHEAD&nbsp;&nbsp;SYSTEMS</span>
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</a>
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<nav class="topbar__nav" aria-label="primary">
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<a href="#projects" class="mono-tiny">↓&nbsp;catalogue</a>
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<a href="#contact" class="mono-tiny">↓&nbsp;contact</a>
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<a href="https://github.com/codeheadsystems" class="mono-tiny">↗&nbsp;github</a>
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</nav>
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</header>
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<main id="top">
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<!-- ─────────── HERO ─────────── -->
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<section class="hero">
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<div class="hero__meta">
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<span class="rule" aria-hidden="true"></span>
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<span class="mono-tiny">CODEHEAD&nbsp;SINCE&nbsp;2005 · APACHE&nbsp;2.0&nbsp;/&nbsp;MIT</span>
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</div>
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<h1 class="hero__title">
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<span class="hero__title-line">An open-source</span>
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<span class="hero__title-line">workshop, <em>since 2005</em>.</span>
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</h1>
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<div class="hero__split">
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<p class="hero__lead">
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Run by <a href="https://github.com/wolpert">Ned Wolpert</a> — coding
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since 1994, Codehead since 2005 (Amazon&nbsp;·&nbsp;Alexa, and points
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before and after). Libraries I've reached for too many times to keep
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rebuilding.
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</p>
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<aside class="hero__sidecar" aria-label="workshop facts">
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<dl>
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<div><dt>Curator</dt><dd>Ned Wolpert</dd></div>
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<div><dt>Coding since</dt><dd>1994</dd></div>
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<div><dt>Codehead since</dt><dd>2005</dd></div>
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<div><dt>License</dt><dd>Apache 2.0 / MIT</dd></div>
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<div><dt>Status</dt><dd><span class="status-dot" aria-hidden="true"></span>actively maintained</dd></div>
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</dl>
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</aside>
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</div>
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<div class="hero__cta">
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<a href="#projects" class="btn btn--primary">enter the catalogue →</a>
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<a href="#contact" class="btn btn--ghost">make contact</a>
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</div>
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</section>
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<!-- ─────────── PROJECTS ─────────── -->
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<section id="projects" class="projects">
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<header class="section-head">
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<span class="mono-tiny">§&nbsp;THE&nbsp;CATALOGUE</span>
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<h2 class="section-head__title">Three corners of the workshop.</h2>
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<p class="section-head__lede">
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Three projects, each with its own discipline — passkeys, password-less
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cryptography, and the small Java tools in between.
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</p>
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</header>
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<!-- ─── 01 · pk-auth ─── -->
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<article class="project">
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<header class="project__rail">
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<span class="mono-tiny">PROJECT</span>
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<span class="project__num" aria-hidden="true">01</span>
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<span class="mono-tiny project__rail-tag">A&nbsp;–&nbsp;AUTH</span>
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</header>
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<div class="project__body">
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<div class="project__heading">
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<h3 class="project__title">pk-auth</h3>
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<span class="project__kicker mono-tiny">passkeys · jvm · webauthn</span>
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</div>
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<p class="project__lede">
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A production-grade, <strong>passkeys-first</strong> authentication
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template for the&nbsp;JVM.
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</p>
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<p class="project__text">
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Ships as a reusable library set you can drop into a Spring Boot,
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Dropwizard, or Micronaut application. The core is framework-neutral;
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the host's user and credential storage is a plug-in SPI.
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</p>
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<ul class="chips">
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<li>Java</li><li>Spring Boot</li><li>Dropwizard</li><li>Micronaut</li><li>WebAuthn / FIDO2</li>
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</ul>
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<div class="project__links">
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<a class="link-arrow link-arrow--lead" href="https://codeheadsystems.github.io/pk-auth/">
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<span>visit the project site</span><span class="link-arrow__icon">↗</span>
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</a>
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<a class="link-arrow" href="https://github.com/codeheadsystems/pk-auth">
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<span>view source</span><span class="link-arrow__icon">↗</span>
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</a>
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</div>
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</div>
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</article>
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<!-- ─── 02 · Hofmann Elimination ─── -->
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<article class="project">
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<header class="project__rail">
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<span class="mono-tiny">PROJECT</span>
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<span class="project__num" aria-hidden="true">02</span>
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<span class="mono-tiny project__rail-tag">B&nbsp;–&nbsp;CRYPTO</span>
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</header>
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<div class="project__body">
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<div class="project__heading">
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<h3 class="project__title">
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<span class="project__title-pre">the</span>
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Hofmann Elimination
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</h3>
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<span class="project__kicker mono-tiny">opaque · oprf · elliptic curves</span>
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</div>
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<p class="project__lede">
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OPAQUE&nbsp;PAKE — a server that <em>never</em> sees your password.
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</p>
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<p class="project__text">
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An implementation of the OPAQUE password-authenticated key exchange,
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written directly from its RFC specifications. Built on OPRF and
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elliptic-curve cryptography. The server authenticates the client
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without ever receiving — or being able to derive — the password.
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</p>
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<div class="rfc-block" role="list" aria-label="implemented RFCs">
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<div role="listitem">
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<span class="mono-tiny rfc-block__id">RFC&nbsp;9380</span>
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<span class="rfc-block__name">Hash-to-Elliptic-Curve</span>
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</div>
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<div role="listitem">
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<span class="mono-tiny rfc-block__id">RFC&nbsp;9497</span>
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<span class="rfc-block__name">OPRF&nbsp;<span class="muted">(mode&nbsp;0)</span></span>
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</div>
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<div role="listitem">
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<span class="mono-tiny rfc-block__id">RFC&nbsp;9807</span>
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<span class="rfc-block__name">OPAQUE-3DH</span>
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</div>
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</div>
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<p class="project__text">
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Java implementation via Bouncy Castle, with a TypeScript client library
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bundled. Rust, Go, and C# implementations are next, alongside a
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cross-language test suite.
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</p>
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<ul class="chips">
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<li>Java</li><li>TypeScript</li><li>Bouncy Castle</li><li>PAKE</li><li>Crypto Research</li>
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</ul>
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<div class="project__links">
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<a class="link-arrow link-arrow--lead" href="https://codeheadsystems.github.io/hofmann-elimination/">
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<span>visit the project site</span><span class="link-arrow__icon">↗</span>
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</a>
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<a class="link-arrow" href="https://github.com/codeheadsystems/hofmann-elimination">
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<span>view source</span><span class="link-arrow__icon">↗</span>
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</a>
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</div>
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</div>
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</article>
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<!-- ─── 03 · Libraries ─── -->
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<article class="project">
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<header class="project__rail">
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<span class="mono-tiny">PROJECT</span>
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<span class="project__num" aria-hidden="true">03</span>
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<span class="mono-tiny project__rail-tag">C&nbsp;–&nbsp;UTILS</span>
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</header>
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<div class="project__body">
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<div class="project__heading">
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<h3 class="project__title">
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<span class="project__title-pre">the</span>
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Libraries
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</h3>
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<span class="project__kicker mono-tiny">java · utilities · testing</span>
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</div>
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<p class="project__lede">
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Small, sharp Java libraries — the things I keep reaching&nbsp;for.
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</p>
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<p class="project__text">
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A growing collection of well-scoped tools, extracted from real
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services so they stay practical rather than aspirational.
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</p>
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<ol class="sub-list">
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">Feature-Flag</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/feature-flag" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Lightweight A/B testing &amp; feature toggles, inspired by an internal Alexa tool.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">Codehead Test</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/codehead-test" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Test utilities for Jupiter, Immutables, and Jackson. Small, easy to consume.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">Database Test</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/database-test" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Test helpers for Cassandra and unique-string generation.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">Metrics</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/metrics" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Dropwizard / Micrometer integration with Dagger support and unit-test helpers.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">OOP Mock</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/oop-mock" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">Out-of-process mocking for functional tests — a spiritual successor to Amazon's Chameleon.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">State Machine Redux</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/smr" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">A KISS state machine. Import/export, games and services. The simpler successor.</p>
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</li>
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<li>
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<div class="sub-list__row">
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<span class="sub-list__name">Local Queue</span>
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<a href="https://github.com/codeheadsystems/libraries/tree/main/local-queue" class="sub-list__link mono-tiny">view&nbsp;→</a>
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</div>
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<p class="sub-list__note">In-process queueing primitives.</p>
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</li>
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</ol>
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<div class="project__links">
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<a class="link-arrow link-arrow--lead" href="https://github.com/codeheadsystems/libraries/">
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<span>view the libraries repo</span><span class="link-arrow__icon">↗</span>
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</a>
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</div>
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</div>
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</article>
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</section>
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<!-- ─────────── PULL QUOTE ─────────── -->
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<section class="pull">
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<span class="mono-tiny pull__mark"></span>
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<p class="pull__text">
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These libraries started life inside of other service,
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then got cleaned up enough to live on its own.
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</p>
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</section>
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<!-- ─────────── CONTACT ─────────── -->
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<section id="contact" class="contact">
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<header class="section-head">
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<span class="mono-tiny">§&nbsp;MAKE&nbsp;CONTACT</span>
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<h2 class="section-head__title">Find Ned in the wild.</h2>
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</header>
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<ul class="contact__grid">
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<li>
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<span class="mono-tiny">Mastodon</span>
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<a rel="me" href="https://hachyderm.io/@CodeHead">@CodeHead<span class="muted">@hachyderm.io</span></a>
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</li>
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<li>
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<span class="mono-tiny">GitHub</span>
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<a href="https://github.com/wolpert">github.com/<span class="muted">wolpert</span></a>
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</li>
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<li>
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<span class="mono-tiny">LinkedIn</span>
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<a href="https://www.linkedin.com/in/wolpert">linkedin.com/in/<span class="muted">wolpert</span></a>
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</li>
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<li>
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<span class="mono-tiny">Email</span>
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<a href="mailto:ned.wolpert@gmail.com">ned.wolpert<span class="muted">@gmail.com</span></a>
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</li>
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</ul>
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</section>
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</main>
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<footer class="footer">
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<div class="footer__col">
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<span class="mono-tiny">Colophon</span>
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<p>Set in <em>Fraunces</em> &amp; JetBrains&nbsp;Mono. Hand-written HTML and CSS. No frameworks, no trackers, no analytics.</p>
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</div>
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<div class="footer__col">
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<span class="mono-tiny">License</span>
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<p>All projects released under Apache&nbsp;2.0 or MIT.</p>
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</div>
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<div class="footer__col">
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<span class="mono-tiny">©&nbsp;2005&nbsp;–&nbsp;present</span>
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<p>Codehead Systems · Ned Wolpert.</p>
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</div>
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</footer>
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</body>
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</html>

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