The HaveIBeenPwned service provided by Troy Hunt contains a whole trove of breach information. It enables you to look up single email address, whole domains and whether a password has been seen in a data breach, for example. It's the latter one that we're interested in for this feature. Let's implement this using the icawebdesign/hibp-php framework-agostic composer package. Install this with…
composer require icawebdesign/hibp-php
HIBP uses a k-anonymity model, meaning that when you request to see if a password is contained in a breach, you don't actually send the plaintext password across the internet, but a subset of a hashed version of it, making it secure.
Laravel, when using Jetstream or Breeze starter-kits uses Fortify under the hood. This also provides a useful authentication system when implementing yourself if you're not using one of the starter kits. It allows creating new users, logging in users and updating users, amongst other things. The part we want to focus on that integrates into all 3 of these sections, though in a single area, is the
password validation rules section.