int gnutls_x509_crt_get_dn(gnutls_x509_crt_t cert, char * buf, size_t * sizeof_buf);
should contain a gnutls_x509_crt_t structure
char * buf
a pointer to a structure to hold the name (may be null)
size_t * sizeof_buf
initially holds the size of buf
This function will copy the name of the Certificate in the
provided buffer. The name will be in the form
"C=xxxx,O=yyyy,CN=zzzz" as described in RFC2253. The output string
will be ASCII or UTF-8 encoded, depending on the certificate data.
If buf is null then only the size will be filled.
GNUTLS_E_SHORT_MEMORY_BUFFER if the provided buffer is not
long enough, and in that case the *sizeof_buf will be updated with
the required size. On success 0 is returned.