NAME

     fido_dev_set_pin, fido_dev_get_retry_count, fido_dev_get_uv_retry_count, fido_dev_reset — FIDO2 device
     management functions

SYNOPSIS

     #include <fido.h>

     int
     fido_dev_set_pin(fido_dev_t *dev, const char *pin, const char *oldpin);

     int
     fido_dev_get_retry_count(fido_dev_t *dev, int *retries);

     int
     fido_dev_get_uv_retry_count(fido_dev_t *dev, int *retries);

     int
     fido_dev_reset(fido_dev_t *dev);

DESCRIPTION

     The fido_dev_set_pin() function sets the PIN of device dev to pin, where pin is a NUL-terminated UTF-8
     string.  If oldpin is not NULL, the device's PIN is changed from oldpin to pin, where pin and oldpin are
     NUL-terminated UTF-8 strings.

     The fido_dev_get_retry_count() function fills retries with the number of PIN retries left in dev before
     lock-out, where retries is an addressable pointer.

     The fido_dev_get_uv_retry_count() function fills retries with the number of built-in UV retries left in dev
     before built-in UV is disabled, where retries is an addressable pointer.

     The fido_dev_reset() function performs a reset on dev, resetting the device's PIN and erasing credentials
     stored on the device.

     Please note that fido_dev_set_pin(), fido_dev_get_retry_count(), fido_dev_get_uv_retry_count(), and
     fido_dev_reset() are synchronous and will block if necessary.

RETURN VALUES

     The error codes returned by fido_dev_set_pin(), fido_dev_get_retry_count(), fido_dev_get_uv_retry_count(),
     and fido_dev_reset() are defined in <fido/err.h>.  On success, FIDO_OK is returned.

SEE ALSO

     fido_cbor_info_uv_attempts(3)

CAVEATS

     Regarding fido_dev_reset(), the actual user-flow to perform a reset is outside the scope of the FIDO2
     specification, and may therefore vary depending on the authenticator.  Yubico authenticators will return
     FIDO_ERR_NOT_ALLOWED if a reset is issued later than 5 seconds after power-up, and FIDO_ERR_ACTION_TIMEOUT
     if the user fails to confirm the reset by touching the key within 30 seconds.