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.\" Copyright (c) 2019 Yubico AB. All rights reserved.
.\" Use of this source code is governed by a BSD-style
.\" license that can be found in the LICENSE file.
.\"
.Dd $Mdocdate: August 29 2022 $
.Dt FIDO_BIO_TEMPLATE 3
.Os
.Sh NAME
.Nm fido_bio_template ,
.Nm fido_bio_template_array_count ,
.Nm fido_bio_template_array_free ,
.Nm fido_bio_template_array_new ,
.Nm fido_bio_template_free ,
.Nm fido_bio_template_id_len ,
.Nm fido_bio_template_id_ptr ,
.Nm fido_bio_template_name ,
.Nm fido_bio_template_new ,
.Nm fido_bio_template_set_id ,
.Nm fido_bio_template_set_name
.Nd FIDO2 biometric template API
.Sh SYNOPSIS
.In fido.h
.In fido/bio.h
.Ft fido_bio_template_t *
.Fn fido_bio_template_new "void"
.Ft void
.Fn fido_bio_template_free "fido_bio_template_t **template_p"
.Ft const char *
.Fn fido_bio_template_name "const fido_bio_template_t *template"
.Ft const unsigned char *
.Fn fido_bio_template_id_ptr "const fido_bio_template_t *template"
.Ft size_t
.Fn fido_bio_template_id_len "const fido_bio_template_t *template"
.Ft int
.Fn fido_bio_template_set_id "fido_bio_template_t *template" "const unsigned char *ptr" "size_t len"
.Ft int
.Fn fido_bio_template_set_name "fido_bio_template_t *template" "const char *name"
.Ft fido_bio_template_array_t *
.Fn fido_bio_template_array_new "void"
.Ft void
.Fn fido_bio_template_array_free "fido_bio_template_array_t **array_p"
.Ft size_t
.Fn fido_bio_template_array_count "const fido_bio_template_array_t *array"
.Ft const fido_bio_template_t *
.Fn fido_bio_template "const fido_bio_template_array_t *array" "size_t idx"
.Sh DESCRIPTION
Existing FIDO2 biometric enrollments are abstracted in
.Em libfido2
by the
.Vt fido_bio_template_t
and
.Vt fido_bio_template_array_t
types.
.Pp
The functions described in this page allow a
.Vt fido_bio_template_t
type to be allocated, deallocated, changed, and inspected,
and a
.Vt fido_bio_template_array_t
type to be allocated, deallocated, and inspected.
For device operations on
.Vt fido_bio_template_t
and
.Vt fido_bio_template_array_t ,
please refer to
.Xr fido_bio_dev_get_info 3 .
.Pp
The
.Fn fido_bio_template_new
function returns a pointer to a newly allocated, empty
.Vt fido_bio_template_t
type.
If memory cannot be allocated, NULL is returned.
.Pp
The
.Fn fido_bio_template_free
function releases the memory backing
.Fa *template_p ,
where
.Fa *template_p
must have been previously allocated by
.Fn fido_bio_template_new .
On return,
.Fa *template_p
is set to NULL.
Either
.Fa template_p
or
.Fa *template_p
may be NULL, in which case
.Fn fido_bio_template_free
is a NOP.
.Pp
The
.Fn fido_bio_template_name
function returns a pointer to a NUL-terminated string containing
the friendly name of
.Fa template ,
or NULL if
.Fa template
does not have a friendly name set.
.Pp
The
.Fn fido_bio_template_id_ptr
function returns a pointer to the template id of
.Fa template ,
or NULL if
.Fa template
does not have an id.
The corresponding length can be obtained by
.Fn fido_bio_template_id_len .
.Pp
The
.Fn fido_bio_template_set_name
function sets the friendly name of
.Fa template
to
.Fa name .
If
.Fa name
is NULL, the friendly name of
.Fa template
is unset.
.Pp
The
.Fn fido_bio_template_array_new
function returns a pointer to a newly allocated, empty
.Vt fido_bio_template_array_t
type.
If memory cannot be allocated, NULL is returned.
.Pp
The
.Fn fido_bio_template_array_free
function releases the memory backing
.Fa *array_p ,
where
.Fa *array_p
must have been previously allocated by
.Fn fido_bio_template_array_new .
On return,
.Fa *array_p
is set to NULL.
Either
.Fa array_p
or
.Fa *array_p
may be NULL, in which case
.Fn fido_bio_template_array_free
is a NOP.
.Pp
The
.Fn fido_bio_template_array_count
function returns the number of templates in
.Fa array .
.Pp
The
.Fn fido_bio_template
function returns a pointer to the template at index
.Fa idx
in
.Fa array .
Please note that the first template in
.Fa array
has an
.Fa idx
(index) value of 0.
.Sh RETURN VALUES
The error codes returned by
.Fn fido_bio_template_set_id
and
.Fn fido_bio_template_set_name
are defined in
.In fido/err.h .
On success,
.Dv FIDO_OK
is returned.
.Sh SEE ALSO
.Xr fido_bio_dev_get_info 3 ,
.Xr fido_bio_enroll_new 3
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