int gnutls_x509_crq_get_attribute_info(gnutls_x509_crq_t cert, int indx, void * oid, size_t * sizeof_oid);
should contain a gnutls_x509_crq_t structure
Specifies which attribute OID to send. Use zero to get the first one.
void * oid
a pointer to a structure to hold the OID
size_t * sizeof_oid
initially holds the maximum size of oid, on return
holds actual size of 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
gnutls_x509_crq_get_attribute_data() to extract the data.
If the buffer provided is not long enough to hold the output, then
*sizeof_oid is updated and GNUTLS_E_SHORT_MEMORY_BUFFER will be
On success, GNUTLS_E_SUCCESS is returned, otherwise a
negative value in case of an error. If your have reached the
last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE
will be returned.