libfido2 is a library designed to facilitate the implementation of the FIDO2 protocol, which enables passwordless authentication using hardware security keys and biometrics. It provides a standardized interface for applications to interact with FIDO2 authenticators, allowing for secure and user-friendly authentication experiences.

• **FIDO2 Protocol Support:** libfido2 implements the core functionalities of the FIDO2 protocol, including registration, authentication, and credential management.
• **Cross-Platform Compatibility:** The library is designed to be portable across different operating systems and platforms, making it suitable for a wide range of applications.
• **Authenticator Abstraction:** libfido2 provides a consistent API for interacting with various FIDO2 authenticators, simplifying development and integration.
• **Security:** The library emphasizes security best practices to ensure the integrity and confidentiality of user credentials and authentication processes.

• **GitHub Repository:** s://github.com/Yubico/libfido2(https://github.com/Yubico/libfido2)
• **Yubico Developer Documentation:** s://developers.yubico.com/libfido2/(https://developers.yubico.com/libfido2/)
• **FIDO Alliance:** s://fidoalliance.org/(https://fidoalliance.org/)

```c

1. include <fido.h>

// … (Initialization and setup)

fido_dev_info_t *devlist; size_t devlist_len;

// Discover FIDO2 authenticators if (fido_dev_info_manifest(NULL, 0, &devlist, &devlist_len) != FIDO_OK) {

   // Handle error

// … (Select an authenticator and perform registration/authentication) ```

**Please note:** This is a simplified example. The actual implementation involves more steps, including error handling, credential management, and interaction with the user interface.