@deftypefun {int} {gnutls_x509_crq_get_attribute_info} (gnutls_x509_crq_t @var{crq}, unsigned @var{indx}, void * @var{oid}, size_t * @var{sizeof_oid})
@var{crq}: should contain a @code{gnutls_x509_crq_t}  type

@var{indx}: Specifies which attribute number to get. Use (0) to get the first one.

@var{oid}: a pointer to a structure to hold the OID

@var{sizeof_oid}: initially holds the maximum size of  @code{oid} , on return
holds actual size of  @code{oid} .

This function will return the requested attribute OID in the
certificate, and the critical flag for it.  The attribute OID will
be stored as a string in the provided buffer.  Use
@code{gnutls_x509_crq_get_attribute_data()}  to extract the data.

If the buffer provided is not long enough to hold the output, then
* @code{sizeof_oid} is updated and @code{GNUTLS_E_SHORT_MEMORY_BUFFER}  will be
returned.

@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS}  (0) is returned, otherwise a
negative error code in case of an error.  If your have reached the
last extension available @code{GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE} 
will be returned.

@strong{Since:} 2.8.0
@end deftypefun