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