fido_bio_template - Man Page

FIDO 2 biometric template API

Synopsis

#include <fido.h>
#include <fido/bio.h>

fido_bio_template_t *
fido_bio_template_new(void);

void
fido_bio_template_free(fido_bio_template_t **template_p);

const char *
fido_bio_template_name(const fido_bio_template_t *template);

const unsigned char *
fido_bio_template_id_ptr(const fido_bio_template_t *template);

size_t
fido_bio_template_id_len(const fido_bio_template_t *template);

int
fido_bio_template_set_id(fido_bio_template_t *template, const unsigned char *ptr, size_t len);

int
fido_bio_template_set_name(fido_bio_template_t *template, const char *name);

fido_bio_template_array_t *
fido_bio_template_array_new(void);

void
fido_bio_template_array_free(fido_bio_template_array_t **array_p);

size_t
fido_bio_template_array_count(const fido_bio_template_array_t *array);

const fido_bio_template_t *
fido_bio_template(const fido_bio_template_array_t *array, size_t idx);

Description

Existing FIDO 2 biometric enrollments are abstracted in libfido2 by the fido_bio_template_t and fido_bio_template_array_t types.

The functions described in this page allow a fido_bio_template_t type to be allocated, deallocated, changed, and inspected, and a fido_bio_template_array_t type to be allocated, deallocated, and inspected. For device operations on fido_bio_template_t and fido_bio_template_array_t, please refer to fido_bio_dev_get_info(3).

The fido_bio_template_new() function returns a pointer to a newly allocated, empty fido_bio_template_t type. If memory cannot be allocated, NULL is returned.

The fido_bio_template_free() function releases the memory backing *template_p, where *template_p must have been previously allocated by fido_bio_template_new(). On return, *template_p is set to NULL. Either template_p or *template_p may be NULL, in which case fido_bio_template_free() is a NOP.

The fido_bio_template_name() function returns a pointer to a NUL-terminated string containing the friendly name of template, or NULL if template does not have a friendly name set.

The fido_bio_template_id_ptr() function returns a pointer to the template id of template, or NULL if template does not have an id. The corresponding length can be obtained by fido_bio_template_id_len().

The fido_bio_template_set_name() function sets the friendly name of template to name. If name is NULL, the friendly name of template is unset.

The fido_bio_template_array_new() function returns a pointer to a newly allocated, empty fido_bio_template_array_t type. If memory cannot be allocated, NULL is returned.

The fido_bio_template_array_free() function releases the memory backing *array_p, where *array_p must have been previously allocated by fido_bio_template_array_new(). On return, *array_p is set to NULL. Either array_p or *array_p may be NULL, in which case fido_bio_template_array_free() is a NOP.

The fido_bio_template_array_count() function returns the number of templates in array.

The fido_bio_template() function returns a pointer to the template at index idx in array. Please note that the first template in array has an idx (index) value of 0.

See Also

fido_bio_dev_get_info(3), fido_bio_enroll_new(3)

Referenced By

fido_bio_dev_get_info(3), fido_bio_enroll_new(3), fido_bio_info_new(3).

The man pages fido_bio_template_array_count(3), fido_bio_template_array_free(3), fido_bio_template_array_new(3), fido_bio_template_free(3), fido_bio_template_id_len(3), fido_bio_template_id_ptr(3), fido_bio_template_name(3), fido_bio_template_new(3), fido_bio_template_set_id(3) and fido_bio_template_set_name(3) are aliases of fido_bio_template(3).

September 13, 2019