Asynchronously look up the issuer of certificate in the database. See gio.tls_database.TlsDatabase.lookupCertificateIssuer for more information.
a #GTlsCertificate
used to interact with the user if necessary
flags which affect the lookup operation
a #GCancellable, or null
callback to call when the operation completes
Asynchronously look up the issuer of certificate in the database. See gio.tls_database.TlsDatabase.lookupCertificateIssuer for more information.