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.\" Copyright (c) 2018 Yubico AB. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in
.\" the documentation and/or other materials provided with the
.\" distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
.\" HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
.\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.Dd $Mdocdate: May 24 2018 $
.Dt FIDO_DEV_GET_ASSERT 3
.Os
.Sh NAME
.Nm fido_dev_get_assert
.Nd obtains an assertion from a FIDO2 device
.Sh SYNOPSIS
.In fido.h
.Ft int
.Fn fido_dev_get_assert "fido_dev_t *dev" "fido_assert_t *assert" "const char *pin"
.Sh DESCRIPTION
The
.Fn fido_dev_get_assert
function asks the FIDO2 device represented by
.Fa dev
for an assertion according to the following parameters defined in
.Fa assert :
.Pp
.Bl -dash -compact
.It
.Nm relying party ID ;
.It
.Nm client data hash ;
.It
.Nm list of allowed credential IDs ;
.It
.Nm user presence and user verification attributes .
.El
.Pp
See
.Xr fido_assert_set_authdata 3
for information on how these values are set.
.Pp
If a PIN is not needed to authenticate the request against
.Fa dev ,
then
.Fa pin
may be NULL.
Otherwise
.Fa pin
must point to a NUL-terminated UTF-8 string.
.Pp
After a successful call to
.Fn fido_dev_get_assert ,
the
.Xr fido_assert_count 3 ,
.Xr fido_assert_user_display_name 3 ,
.Xr fido_assert_user_icon 3 ,
.Xr fido_assert_user_name 3 ,
.Xr fido_assert_authdata_ptr 3 ,
.Xr fido_assert_user_id_ptr 3 ,
.Xr fido_assert_sig_ptr 3 ,
and
.Xr fido_assert_sigcount 3
functions may be invoked on
.Fa assert
to retrieve the various attributes of the generated assertion.
.Pp
Please note that
.Fn fido_dev_get_assert
is synchronous and will block if necessary.
.Sh RETURN VALUES
The error codes returned by
.Fn fido_dev_get_assert
are defined in
.In fido/err.h .
On success,
.Dv FIDO_OK
is returned.
.Sh SEE ALSO
.Xr fido_assert_new 3 ,
.Xr fido_assert_set_authdata 3
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