should contain a gnutls_x509_crt_t type
const char * oid
holds an Object Identified in null terminated string
In case multiple same OIDs exist in the RDN, this
specifies which to send. Use (0) to get the first
unsigned int raw_flag
If non-zero returns the raw DER data of the DN part.
void * buf a pointer where the DN part will be copied (may be
size_t * buf_size
initially holds the size of buf
This function will extract the part of the name of the
Certificate subject specified by the given OID. The output, if
the raw flag is not used, will be encoded as described in
RFC4514. Thus a string that is ASCII or UTF-8 encoded, depending
on the certificate data.
Some helper macros with popular OIDs can be found in
gnutls/x509.h If raw flag is (0), this function will only return
known OIDs as text. Other OIDs will be DER encoded, as described
in RFC4514 -- in hex format with a '#' prefix. You can check
about known OIDs using gnutls_x509_dn_oid_known().
If buf is null then only the size will be filled. If the
raw_flag is not specified the output is always null terminated,
buf_size will not include the null character.
GNUTLS_E_SHORT_MEMORY_BUFFER if the provided buffer is not long
enough, and in that case the buf_size will be updated with the
required size. GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE if there are
no data in the current index. On success 0 is returned.
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gnutls 3.7.1 gnutls_x509_crt_get_dn_by_oid(3)