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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>Web Crypto Key Generation</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 1rem;max-width:420px}button{padding:.55rem 1rem;border:none;border-radius:8px;background:#2563eb;color:#fff;font-size:.95rem;cursor:pointer}#status{margin-top:1rem;font-size:.95rem;color:#166534;font-weight:500}.hint{margin-top:.75rem;font-size:.875rem;color:#64748b;max-width:420px}</style>

</head>

<body>

  <h1>Modern Key Generation</h1>

  <p>Click the button to generate an RSA key pair using the Web Crypto API.</p>

  <button type=button id=genKey>Generate Key Pair</button>

  <p id=status aria-live=polite></p>

  <p class=hint>In production, export the public key and send it to your server over HTTPS.</p>

  <script>document.getElementById("genKey").addEventListener("click",(async function(){const e=document.getElementById("status");e.textContent="Generating keys...";try{await crypto.subtle.generateKey({name:"RSA-OAEP",modulusLength:2048,publicExponent:new Uint8Array([1,0,1]),hash:"SHA-256"},!0,["encrypt","decrypt"]),e.textContent="Key pair generated successfully."}catch(t){e.textContent="Error: "+t.message,e.style.color="#dc2626"}}))</script>

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Web Crypto API — Modern keygen Replacement