k5_etypes_contains
krb5_boolean k5_etypes_contains(const krb5_enctype *list, krb5_enctype etype);
in_list = k5_etypes_contains(etypes, enctype);
if (!k5_etypes_contains(enctypes, cred.keyblock.enctype)) {
if (k5_etypes_contains(keytab_list, req_list[i]))
ret = k5_etypes_contains(list, etype);