gnutls_x509_crt_get_issuer - API function
int gnutls_x509_crt_get_issuer(gnutls_x509_crt_t cert, gnutls_x509_dn_t * dn);
Return the Certificate's Issuer DN as a gnutls_x509_dn_t data type, that can be decoded using gnutls_x509_dn_get_rdn_ava().
Note that dn should be treated as constant. Because it points into the cert object, you should not use dn after cert is deallocated.
Returns 0 on success, or an error code.
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