Asynchronously look up the issuer of certificate in the database. See TlsDatabase.lookupCertificateIssuer for more information.
a gio.TlsCertificate
used to interact with the user if necessary
flags which affect the lookup operation
a gio.Cancellable, or NULL
callback to call when the operation completes
the data to pass to the callback function
2.30
Asynchronously look up the issuer of certificate in the database. See TlsDatabase.lookupCertificateIssuer for more information.