FIDO_CRED_VERIFY(3) Library Functions Manual FIDO_CRED_VERIFY(3)
NAME
fido_cred_verify, fido_cred_verify_self — verify the attestation signa-
ture of a FIDO2 credential
SYNOPSIS
#include <fido.h>
int
fido_cred_verify(const fido_cred_t *cred);
int
fido_cred_verify_self(const fido_cred_t *cred);
DESCRIPTION
The fido_cred_verify() and fido_cred_verify_self() functions verify
whether the attestation signature contained in cred matches the attrib-
utes of the credential. Before using fido_cred_verify() or
fido_cred_verify_self() in a sensitive context, the reader is strongly
encouraged to make herself familiar with the FIDO2 credential attesta-
tion process as defined in the Web Authentication (webauthn) standard.
The fido_cred_verify() function verifies whether the client data hash,
relying party ID, credential ID, type, protection policy, minimum PIN
length, and resident/discoverable key and user verification attributes
of cred have been attested by the holder of the private counterpart of
the public key contained in the credential's x509 certificate.
Please note that the x509 certificate itself is not verified.
The attestation statement formats supported by fido_cred_verify() are
packed, fido-u2f, and tpm. The attestation type implemented by
fido_cred_verify() is Basic Attestation.
The fido_cred_verify_self() function verifies whether the client data
hash, relying party ID, credential ID, type, protection policy, minimum
PIN length, and resident/discoverable key and user verification attrib-
utes of cred have been attested by the holder of the credential's pri-
vate key.
The attestation statement formats supported by fido_cred_verify_self()
are packed and fido-u2f. The attestation type implemented by
fido_cred_verify_self() is Self Attestation.
Other attestation formats and types are not supported.
RETURN VALUES
The error codes returned by fido_cred_verify() and
fido_cred_verify_self() are defined in <fido/err.h>. If cred passes
verification, then FIDO_OK is returned.
SEE ALSO
fido_cred_new(3), fido_cred_set_authdata(3)
Debian May 23, 2018 FIDO_CRED_VERIFY(3)
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