Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

FIDO_CRED_NEW(3)           Library Functions Manual           FIDO_CRED_NEW(3)

NAME
     fido_cred_new, fido_cred_free, fido_cred_pin_minlen, fido_cred_prot,
     fido_cred_fmt, fido_cred_rp_id, fido_cred_rp_name, fido_cred_user_name,
     fido_cred_display_name, fido_cred_authdata_ptr,
     fido_cred_authdata_raw_ptr, fido_cred_clientdata_hash_ptr,
     fido_cred_id_ptr, fido_cred_aaguid_ptr, fido_cred_largeblob_key_ptr,
     fido_cred_pubkey_ptr, fido_cred_sig_ptr, fido_cred_user_id_ptr,
     fido_cred_x5c_ptr, fido_cred_attstmt_ptr, fido_cred_authdata_len,
     fido_cred_authdata_raw_len, fido_cred_clientdata_hash_len,
     fido_cred_id_len, fido_cred_aaguid_len, fido_cred_largeblob_key_len,
     fido_cred_pubkey_len, fido_cred_sig_len, fido_cred_user_id_len,
     fido_cred_x5c_len, fido_cred_attstmt_len, fido_cred_type,
     fido_cred_flags, fido_cred_sigcount - FIDO2 credential API

SYNOPSIS
     #include <fido.h>

     fido_cred_t *
     fido_cred_new(void);

     void
     fido_cred_free(fido_cred_t **cred_p);

     size_t
     fido_cred_pin_minlen(const fido_cred_t *cred);

     int
     fido_cred_prot(const fido_cred_t *cred);

     const char *
     fido_cred_fmt(const fido_cred_t *cred);

     const char *
     fido_cred_rp_id(const fido_cred_t *cred);

     const char *
     fido_cred_rp_name(const fido_cred_t *cred);

     const char *
     fido_cred_user_name(const fido_cred_t *cred);

     const char *
     fido_cred_display_name(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_authdata_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_authdata_raw_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_clientdata_hash_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_id_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_aaguid_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_largeblob_key_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_pubkey_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_sig_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_user_id_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_x5c_ptr(const fido_cred_t *cred);

     const unsigned char *
     fido_cred_attstmt_ptr(const fido_cred_t *cred);

     size_t
     fido_cred_authdata_len(const fido_cred_t *cred);

     size_t
     fido_cred_authdata_raw_len(const fido_cred_t *cred);

     size_t
     fido_cred_clientdata_hash_len(const fido_cred_t *cred);

     size_t
     fido_cred_id_len(const fido_cred_t *cred);

     size_t
     fido_cred_aaguid_len(const fido_cred_t *cred);

     size_t
     fido_cred_largeblob_key_len(const fido_cred_t *cred);

     size_t
     fido_cred_pubkey_len(const fido_cred_t *cred);

     size_t
     fido_cred_sig_len(const fido_cred_t *cred);

     size_t
     fido_cred_user_id_len(const fido_cred_t *cred);

     size_t
     fido_cred_x5c_len(const fido_cred_t *cred);

     size_t
     fido_cred_attstmt_len(const fido_cred_t *cred);

     int
     fido_cred_type(const fido_cred_t *cred);

     uint8_t
     fido_cred_flags(const fido_cred_t *cred);

     uint32_t
     fido_cred_sigcount(const fido_cred_t *cred);

DESCRIPTION
     FIDO2 credentials are abstracted in libfido2 by the fido_cred_t type.
     The functions described in this page allow a fido_cred_t type to be
     allocated, deallocated, and inspected.  For other operations on
     fido_cred_t, please refer to fido_cred_set_authdata(3),
     fido_cred_exclude(3), fido_cred_verify(3), and fido_dev_make_cred(3).

     The fido_cred_new() function returns a pointer to a newly allocated,
     empty fido_cred_t type.  If memory cannot be allocated, NULL is returned.

     The fido_cred_free() function releases the memory backing *cred_p, where
     *cred_p must have been previously allocated by fido_cred_new().  On
     return, *cred_p is set to NULL.  Either cred_p or *cred_p may be NULL, in
     which case fido_cred_free() is a NOP.

     If the CTAP 2.1 FIDO_EXT_MINPINLEN extension is enabled on cred, then the
     fido_cred_pin_minlen() function returns the minimum PIN length of cred.
     Otherwise, fido_cred_pin_minlen() returns zero.  See
     fido_cred_set_pin_minlen(3) on how to enable this extension.

     If the CTAP 2.1 FIDO_EXT_CRED_PROTECT extension is enabled on cred, then
     the fido_cred_prot() function returns the protection of cred.  Otherwise,
     fido_cred_prot() returns zero.  See fido_cred_set_prot(3) for the
     protection policies understood by libfido2.

     The fido_cred_fmt() function returns a pointer to a NUL-terminated string
     containing the attestation statement format identifier of cred, or NULL
     if cred does not have a format set.

     The fido_cred_rp_id(), fido_cred_rp_name(), fido_cred_user_name(), and
     fido_cred_display_name() functions return pointers to NUL-terminated
     strings holding the relying party ID, relying party name, user name, and
     user display name attributes of cred, or NULL if the respective entry is
     not set.

     The fido_cred_authdata_ptr(), fido_cred_authdata_raw_ptr(),
     fido_cred_clientdata_hash_ptr(), fido_cred_id_ptr(),
     fido_cred_aaguid_ptr(), fido_cred_largeblob_key_ptr(),
     fido_cred_pubkey_ptr(), fido_cred_sig_ptr(), fido_cred_user_id_ptr(),
     fido_cred_x5c_ptr(), and fido_cred_attstmt_ptr() functions return
     pointers to the CBOR-encoded and raw authenticator data, client data
     hash, ID, authenticator attestation GUID, "largeBlobKey", public key,
     signature, user ID, x509 certificate, and attestation statement parts of
     cred, or NULL if the respective entry is not set.

     The corresponding length can be obtained by fido_cred_authdata_len(),
     fido_cred_authdata_raw_len(), fido_cred_clientdata_hash_len(),
     fido_cred_id_len(), fido_cred_aaguid_len(),
     fido_cred_largeblob_key_len(), fido_cred_pubkey_len(),
     fido_cred_sig_len(), fido_cred_user_id_len(), fido_cred_x5c_len(), and
     fido_cred_attstmt_len().

     The authenticator data, x509 certificate, and signature parts of a
     credential are typically passed to a FIDO2 server for verification.

     The fido_cred_type() function returns the COSE algorithm of cred.

     The fido_cred_flags() function returns the authenticator data flags of
     cred.

     The fido_cred_sigcount() function returns the authenticator data
     signature counter of cred.

RETURN VALUES
     The authenticator data returned by fido_cred_authdata_ptr() is a CBOR-
     encoded byte string, as obtained from the authenticator.  To obtain the
     decoded byte string, use fido_cred_authdata_raw_ptr().

     If not NULL, pointers returned by fido_cred_fmt(),
     fido_cred_authdata_ptr(), fido_cred_clientdata_hash_ptr(),
     fido_cred_id_ptr(), fido_cred_aaguid_ptr(),
     fido_cred_largeblob_key_ptr(), fido_cred_pubkey_ptr(),
     fido_cred_sig_ptr(), and fido_cred_x5c_ptr() are guaranteed to exist
     until any API function that takes cred without the const qualifier is
     invoked.

SEE ALSO
     fido_cred_exclude(3), fido_cred_set_authdata(3),
     fido_cred_set_pin_minlen(3), fido_cred_set_prot(3), fido_cred_verify(3),
     fido_credman_metadata_new(3), fido_dev_largeblob_get(3),
     fido_dev_make_cred(3)

NetBSD 10.99               $Mdocdate: May 23 2018 $               NetBSD 10.99