.\" 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 11 2020 $
.Dt FIDO_BIO_DEV_GET_INFO 3
.Os
.Sh NAME
.Nm fido_bio_dev_get_info ,
.Nm fido_bio_dev_enroll_begin ,
.Nm fido_bio_dev_enroll_continue ,
.Nm fido_bio_dev_enroll_cancel ,
.Nm fido_bio_dev_enroll_remove ,
.Nm fido_bio_dev_get_template_array ,
.Nm fido_bio_dev_set_template_name
.Nd FIDO 2 biometric authenticator API
.Sh SYNOPSIS
.In fido.h
.In fido/bio.h
.Ft int
.Fn fido_bio_dev_get_info "fido_dev_t *dev" "fido_bio_info_t *info"
.Ft int
.Fn fido_bio_dev_enroll_begin "fido_dev_t *dev" "fido_bio_template_t *template" "fido_bio_enroll_t *enroll" "uint32_t timeout_ms" "const char *pin"
.Ft int
.Fn fido_bio_dev_enroll_continue "fido_dev_t *dev" "const fido_bio_template_t *template" "fido_bio_enroll_t *enroll" "uint32_t timeout_ms"
.Ft int
.Fn fido_bio_dev_enroll_cancel "fido_dev_t *dev"
.Ft int
.Fn fido_bio_dev_enroll_remove "fido_dev_t *dev" "const fido_bio_template_t *template" "const char *pin"
.Ft int
.Fn fido_bio_dev_get_template_array "fido_dev_t *dev" "fido_bio_template_array_t *template_array" "const char *pin"
.Ft int
.Fn fido_bio_dev_set_template_name "fido_dev_t *dev" "const fido_bio_template_t *template" "const char *pin"
.Sh DESCRIPTION
The functions described in this page allow biometric
templates on a FIDO2 authenticator to be listed, created,
removed, and customised.
Please note that not all FIDO2 authenticators support biometric
enrollment.
For a description of the types involved, please refer to
.Xr fido_bio_info_new 3 ,
.Xr fido_bio_enroll_new 3 ,
and
.Xr fido_bio_template 3 .
.Pp
The
.Fn fido_bio_dev_get_info
function populates
.Fa info
with sensor information from
.Fa dev .
.Pp
The
.Fn fido_bio_dev_enroll_begin
function initiates a biometric enrollment on
.Fa dev ,
instructing the authenticator to wait
.Fa timeout_ms
milliseconds.
On success,
.Fa template
and
.Fa enroll
will be populated with the newly created template's
information and enrollment status, respectively.
.Pp
The
.Fn fido_bio_dev_enroll_continue
function continues an ongoing enrollment on
.Fa dev ,
instructing the authenticator to wait
.Fa timeout_ms
milliseconds.
On success,
.Fa enroll
will be updated to reflect the status of the biometric
enrollment.
.Pp
The
.Fn fido_bio_dev_enroll_cancel
function cancels an ongoing enrollment on
.Fa dev .
.Pp
The
.Fn fido_bio_dev_enroll_remove
function removes
.Fa template
from
.Fa dev .
.Pp
The
.Fn fido_bio_dev_get_template_array
function populates
.Fa template_array
with the templates currently enrolled on
.Fa dev .
.Pp
The
.Fn fido_bio_dev_set_template_name
function sets the friendly name of
.Fa template
on
.Fa dev .
.Pp
The error codes returned by
.Fn fido_bio_dev_get_info ,
.Fn fido_bio_dev_enroll_begin ,
.Fn fido_bio_dev_enroll_continue ,
.Fn fido_bio_dev_enroll_cancel ,
.Fn fido_bio_dev_enroll_remove ,
.Fn fido_bio_dev_get_template_array ,
and
.Fn fido_bio_dev_set_template_name
are defined in
.In fido/err.h .
On success,
.Dv FIDO_OK
is returned.
.Sh SEE ALSO
.Xr fido_bio_enroll_new 3 ,
.Xr fido_bio_info_new 3 ,
.Xr fido_bio_template 3
.Sh CAVEATS
Biometric enrollment is a tentative feature of FIDO 2.1.
Applications willing to strictly abide by FIDO 2.0 should refrain
from using biometric enrollment.
Applications using biometric enrollment should ensure it is
supported by the authenticator prior to using the API.
Since FIDO 2.1 hasn't been finalised, there is a chance the
functionality and associated data structures may change.