FIDO_ASSERT_VERIFY(3) Library Functions Manual FIDO_ASSERT_VERIFY(3)
NAME
fido_assert_verify — verifies the signature of a FIDO2 assertion state-
ment
SYNOPSIS
#include <fido.h>
int
fido_assert_verify(const fido_assert_t *assert, size_t idx,
int cose_alg, const void *pk);
DESCRIPTION
The fido_assert_verify() function verifies whether the signature con-
tained in statement index idx of assert matches the parameters of the
assertion. Before using fido_assert_verify() in a sensitive context,
the reader is strongly encouraged to make herself familiar with the
FIDO2 assertion statement process as defined in the Web Authentication
(webauthn) standard.
A brief description follows:
The fido_assert_verify() function verifies whether the client data hash,
relying party ID, user presence and user verification attributes of
assert have been attested by the holder of the private counterpart of
the public key pk of COSE type cose_alg, where cose_alg is COSE_ES256,
COSE_ES384, COSE_RS256, or COSE_EDDSA, and pk points to a es256_pk_t,
es384_pk_t, rs256_pk_t, or eddsa_pk_t type accordingly.
Please note that the first statement in assert has an idx of 0.
RETURN VALUES
The error codes returned by fido_assert_verify() are defined in
<fido/err.h>. If statement idx of assert passes verification with pk,
then FIDO_OK is returned.
SEE ALSO
fido_assert_new(3), fido_assert_set_authdata(3)
Debian July 15, 2022 FIDO_ASSERT_VERIFY(3)
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