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.\" Copyright (c) 2018-2022 Yubico AB. All rights reserved.
.\"
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.\"
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.\" notice, this list of conditions and the following disclaimer.
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.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.Dd $Mdocdate: December 1 2022 $
.Dt FIDO_ASSERT_ALLOW_CRED 3
.Os
.Sh NAME
.Nm fido_assert_allow_cred ,
.Nm fido_assert_empty_allow_list
.Nd manage allow lists in a FIDO2 assertion
.Sh SYNOPSIS
.In fido.h
.Ft int
.Fn fido_assert_allow_cred "fido_assert_t *assert" "const unsigned char *ptr" "size_t len"
.Ft int
.Fn fido_assert_empty_allow_list "fido_assert_t *assert"
.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 FIDO2 credential ID, please refer to the
Web Authentication (webauthn) standard.
.Pp
The
.Fn fido_assert_empty_allow_list
function empties the list of credentials allowed in
.Fa assert .
.Sh RETURN VALUES
The error codes returned by
.Fn fido_assert_allow_cred
and
.Fn fido_assert_empty_allow_list
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
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