gnutls_x509_crt_get_issuer_dn - This function returns the Certificate’s
issuer distinguished name
int gnutls_x509_crt_get_issuer_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 issuer 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.
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