@deftypefun {int} {gnutls_x509_crq_get_extension_info} (gnutls_x509_crq_t @var{crq}, unsigned @var{indx}, void * @var{oid}, size_t * @var{sizeof_oid}, unsigned int * @var{critical})

@var{crq}: should contain a @code{gnutls_x509_crq_t}  type

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

@var{oid}: a pointer to store the OID

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

holds actual size of  @code{oid} .

@var{critical}: output variable with critical flag, may be NULL.

This function will return the requested extension OID in the

certificate, and the critical flag for it.  The extension OID will

be stored as a string in the provided buffer.  Use

@code{gnutls_x509_crq_get_extension_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