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-rw-r--r--utils/osmo-auc-gen.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/utils/osmo-auc-gen.c b/utils/osmo-auc-gen.c
index 6fa7cec7..4e2456a7 100644
--- a/utils/osmo-auc-gen.c
+++ b/utils/osmo-auc-gen.c
@@ -198,6 +198,10 @@ int main(int argc, char **argv)
}
ul = strtoul(optarg, 0, 10);
test_aud.u.umts.sqn = ul;
+ /* Before calculating the UMTS auth vector,
+ * osmo_auth_gen_vec() increments the SQN. SQN-1 here
+ * to end up with the SQN the user requested. */
+ test_aud.u.umts.sqn--;
break;
case 'r':
rc = osmo_hexparse(optarg, _rand, sizeof(_rand));
@@ -260,16 +264,14 @@ int main(int argc, char **argv)
else {
dump_auth_vec(vec);
if (test_aud.type == OSMO_AUTH_TYPE_UMTS)
- /* After generating, SQN is incremented, so -1 */
- printf("SQN:\t%" PRIu64 "\n", test_aud.u.umts.sqn - 1);
+ printf("SQN:\t%" PRIu64 "\n", test_aud.u.umts.sqn);
}
/* After recovering SQN.MS from AUTS, milenage_gen_vec_auts() does
- * aud->u.umts.sqn++, and after vector generation milenage_gen_vec()
- * does another ++, so to show SQN.MS we need to -2 */
+ * aud->u.umts.sqn++, so to show SQN.MS we need to -1 */
if (auts_is_set)
printf("AUTS success: SQN.MS = %" PRIu64 "\n",
- test_aud.u.umts.sqn - 2);
+ test_aud.u.umts.sqn - 1);
exit(0);
}