NAME

     fido_cbor_info_new, fido_cbor_info_free, fido_dev_get_cbor_info, fido_cbor_info_aaguid_ptr,
     fido_cbor_info_extensions_ptr, fido_cbor_info_protocols_ptr, fido_cbor_info_versions_ptr,
     fido_cbor_info_options_name_ptr, fido_cbor_info_options_value_ptr,
     fido_cbor_info_aaguid_len, fido_cbor_info_extensions_len, fido_cbor_info_protocols_len,
     fido_cbor_info_versions_len, fido_cbor_info_options_len, fido_cbor_info_maxmsgsiz — FIDO 2
     CBOR Info API

SYNOPSIS

     #include <fido.h>

     fido_cbor_info_t *
     fido_cbor_info_new(void);

     void
     fido_cbor_info_free(fido_cbor_info_t **ci_p);

     int
     fido_dev_get_cbor_info(fido_dev_t *dev, fido_cbor_info_t *ci);

     const unsigned char *
     fido_cbor_info_aaguid_ptr(const fido_cbor_info_t *ci);

     char **
     fido_cbor_info_extensions_ptr(const fido_cbor_info_t *ci);

     const uint8_t *
     fido_cbor_info_protocols_ptr(const fido_cbor_info_t *ci);

     char **
     fido_cbor_info_versions_ptr(const fido_cbor_info_t *ci);

     char **
     fido_cbor_info_options_name_ptr(const fido_cbor_info_t *ci);

     const bool *
     fido_cbor_info_options_value_ptr(const fido_cbor_info_t *ci);

     size_t
     fido_cbor_info_aaguid_len(const fido_cbor_info_t *ci);

     size_t
     fido_cbor_info_extensions_len(const fido_cbor_info_t *ci);

     size_t
     fido_cbor_info_protocols_len(const fido_cbor_info_t *ci);

     size_t
     fido_cbor_info_versions_len(const fido_cbor_info_t *ci);

     size_t
     fido_cbor_info_options_len(const fido_cbor_info_t *ci);

     uint64_t
     fido_cbor_info_maxmsgsiz(const fido_cbor_info_t *ci);

DESCRIPTION

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

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

     The fido_dev_get_cbor_info() function transmits a CTAP_CBOR_GETINFO command to dev and fills
     ci with attributes retrieved from the command's response.  The fido_dev_get_cbor_info()
     function may block.

     The fido_cbor_info_aaguid_ptr(), fido_cbor_info_extensions_ptr(),
     fido_cbor_info_protocols_ptr(), and fido_cbor_info_versions_ptr() functions return pointers
     to the AAGUID, supported extensions, PIN protocol and CTAP version strings of ci.  The
     corresponding length of a given attribute can be obtained by fido_cbor_info_aaguid_len(),
     fido_cbor_info_extensions_len(), fido_cbor_info_protocols_len(), or
     fido_cbor_info_versions_len().

     The fido_cbor_info_options_name_ptr() and fido_cbor_info_options_value_ptr() functions
     return pointers to the array of option names and their respective values in ci.  The length
     of the options array is returned by fido_cbor_info_options_len().

     The fido_cbor_info_maxmsgsiz() function returns the maximum message size of ci.

     A complete example of how to use these functions can be found in the example/info.c file
     shipped with libfido2.

RETURN VALUES

     The fido_cbor_info_aaguid_ptr(), fido_cbor_info_extensions_ptr(),
     fido_cbor_info_protocols_ptr(), fido_cbor_info_versions_ptr(),
     fido_cbor_info_options_name_ptr(), and fido_cbor_info_options_value_ptr() functions return
     NULL if the respective field in ci is absent.  If not NULL, returned pointers are guaranteed
     to exist until any API function that takes ci without the const qualifier is invoked.

SEE ALSO

     fido_dev_open(3)