.\" Copyright (c) 2018 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: February 7 2020 $
.Dt FIDO_ASSERT_ALLOW_CRED 3
.Os
.Sh NAME
.Nm fido_assert_allow_cred
.Nd appends a credential ID to the list of credentials allowed in an assertion
.Sh SYNOPSIS
.In fido.h
.Ft int
.Fn fido_assert_allow_cred "fido_assert_t *assert" "const unsigned char *ptr" "size_t len"
.Sh DESCRIPTION
The
.Fn fido_assert_allow_cred
function adds
.Fa ptr
to the list of credentials allowed in
.Fa assert ,
where
.Fa ptr
points to a credential ID of
.Fa len
bytes.
A copy of
.Fa ptr
is made, and no references to the passed pointer are kept.
If
.Fn fido_assert_allow_cred
fails, the existing list of allowed credentials is preserved.
.Pp
For the format of a FIDO 2 credential ID, please refer to the
Web Authentication (webauthn) standard.
.Sh RETURN VALUES
The error codes returned by
.Fn fido_assert_allow_cred
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 ,
.Xr fido_dev_get_assert 3