fetchcreds
while ((kret = krb5_cc_next_cred(context, id, &cursor, &fetchcreds)) == KRB5_OK) {
if (krb5int_cc_creds_match_request(context, whichfields, mcreds, &fetchcreds))
fetched.pref = pref (fetchcreds.keyblock.enctype,
*creds = fetchcreds;
krb5_free_cred_contents(context, &fetchcreds);