should contain a gnutls_x509_crt_t type
This specifies which OID to return. Use (0) to get
the first one.
void * oid a pointer to a buffer to hold the OID (may be null)
size_t * oid_size
initially holds the size of oid
This function will extract the OIDs of the name of the
Certificate issuer specified by the given index.
If oid is null then only the size will be filled. The oid
returned will be null terminated, although oid_size will not
account for the trailing null.
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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