gnutls_x509_crt_get_issuer_dn3 - API function
int gnutls_x509_crt_get_issuer_dn3(gnutls_x509_crt_t cert, gnutls_datum_t * dn, unsigned flags);
This function will allocate buffer and copy the name of issuer of the Certificate. The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as described in RFC4514. The output string will be ASCII or UTF-8 encoded, depending on the certificate data.
When the flag GNUTLS_X509_DN_FLAG_COMPAT is specified, the output format will match the format output by previous to 3.5.6 versions of GnuTLS which was not not fully RFC4514-compliant.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error value.
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