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 one.
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 null).
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
If buf is null then only the size will be filled. If the raw_flag
is not specified the output is always null terminated, although the
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 3.5.9 gnutls_x509_crt_get_dn_by_oid(3)