FIDO_CRED_EXCLUDE(3)       Library Functions Manual       FIDO_CRED_EXCLUDE(3)

NAME
     fido_cred_exclude, fido_cred_empty_exclude_list - manage exclude lists in
     a FIDO2 credential

SYNOPSIS
     #include <fido.h>

     int
     fido_cred_exclude(fido_cred_t *cred, const unsigned char *ptr,
         size_t len);

     int
     fido_cred_empty_exclude_list(fido_cred_t *cred);

DESCRIPTION
     The fido_cred_exclude() function adds ptr to the list of credentials
     excluded by cred, where ptr points to a credential ID of len bytes.  A
     copy of ptr is made, and no references to the passed pointer are kept.
     If fido_cred_exclude() fails, the existing list of excluded credentials
     is preserved.

     If fido_cred_exclude returns success and cred is later passed to
     fido_dev_make_cred(3) on a device that contains the credential denoted by
     ptr, then fido_dev_make_cred(3) will fail.

     For the format of a FIDO2 credential ID, please refer to the Web
     Authentication (webauthn) standard.

     The fido_cred_empty_exclude_list() function empties the list of
     credentials excluded by cred.

RETURN VALUES
     The error codes returned by fido_cred_exclude() and
     fido_cred_empty_exclude_list() are defined in <fido/err.h>.  On success,
     FIDO_OK is returned.

SEE ALSO
     fido_cred_new(3), fido_cred_set_authdata(3), fido_dev_make_cred(3)

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