gnutls_x509_rdn_get_oid - parse an RDN sequence and returns an OID.
int gnutls_x509_rdn_get_oid(const gnutls_datum_t * idn, int indx, void
* buf, size_t * sizeof_buf);
const gnutls_datum_t * idn
should contain a DER encoded RDN sequence
int indx Indicates which OID to return. Use 0 for the first one.
void * buf a pointer to a structure to hold the peer’s name OID
size_t * sizeof_buf
holds the size of buf
This function will return the specified Object identifier, of the RDN
On success, GNUTLS_E_SUCCESS is returned, or
GNUTLS_E_SHORT_MEMORY_BUFFER is returned and *sizeof_buf is updated if
the provided buffer is not long enough, otherwise a negative error
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