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FIDO_CRED_VERIFY(3)        Library Functions Manual        FIDO_CRED_VERIFY(3)

NAME
     fido_cred_verify, fido_cred_verify_self - verify the attestation
     signature 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
     attributes 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 attestation
     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
     attributes of cred have been attested by the holder of the credential's
     private 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)

NetBSD 10.99               $Mdocdate: May 23 2018 $               NetBSD 10.99