fido_assert_verify

FIDO_ASSERT_VERIFY(3) Library Functions Manual FIDO_ASSERT_VERIFY(3)

fido_assert_verify
verifies the signature of a FIDO 2 assertion statement

#include <fido.h>
int
fido_assert_verify(fido_assert_t *assert, size_t idx, int cose_alg, const void *pk);

The fido_assert_verify() function verifies whether the signature contained 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 FIDO 2 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_RS256, or COSE_EDDSA, and pk points to a es256_pk_t, rs256_pk_t, or eddsa_pk_t type accordingly.
Please note that the first statement in assert has an idx of 0.

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.

fido_assert_new(3), fido_assert_set_authdata(3)
May 24, 2018 Linux 5.3.12-arch1-1