krb5_test_key
ret = krb5_test_key(krb5, &base_key, &test->Kc, TEST_KC);
ret = krb5_test_key(krb5, &base_key, &test->Ke, TEST_KE);
ret = krb5_test_key(krb5, &base_key, &test->Ki, TEST_KI);