CKey is a Chrome extension developed by chomekeyextension that emulates a Hardware Authentication Device (HAD). This extension allows developers to test their applications without the need for an actual physical device. It is available for free on the Chrome platform.

With CKey, developers can answer Webauthn requests for both registering new keys and authenticating with existing ones. The extension utilizes browser standards such as the Web Cryptography API and Concise Binary Object Representation for generating and interacting with key material.

However, it is important to note that CKey cannot provide the same level of security as a real HAD. Therefore, it is recommended to use it solely for development, debugging, and testing purposes.