---
tests/unit_tests/openvpn/test_crypto.c | 28 ++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/tests/unit_tests/openvpn/test_crypto.c
b/tests/unit_tests/openvpn/test_crypto.c
index 7fb9d624..ca170547 100644
--- a/tests/unit_tests/openvpn/test_crypto.c
+++ b/tests/unit_tests/openvpn/test_crypto.c
@@ -426,6 +426,34 @@ test_mssfix_mtu_calculation(void **state)
assert_int_equal(f.mss_fix, 927);
}
}
+#ifdef USE_COMP
+ o.comp.alg = COMP_ALG_LZO;
+
+ /* Same but with compression added. Compression adds one byte extra to the
+ * payload so the payload should be reduced by compared to the no
+ * compression calculation before */
+ for (int i = 990;i <= 1010;i++)
+ {
+ /* 992 - 1008 should end up with the same mssfix value all they
+ * all result in the same CBC block size/padding and <= 991 and >=1008
+ * should be one block less and more respectively */
+ o.ce.mssfix = i;
+ frame_calculate_dynamic(&f, &kt, &o, NULL);
+ if (i <= 991)
+ {
+ assert_int_equal(f.mss_fix, 910);
+ }
+ else if (i >= 1008)
+ {
+ assert_int_equal(f.mss_fix, 942);
+ }
+ else
+ {
+ assert_int_equal(f.mss_fix, 926);
+ }
+ }
+ o.comp.alg = COMP_ALG_UNDEF;
+#endif
/* tls client, auth SHA1, cipher AES-256-GCM */
o.authname = "SHA1";
--
2.33.0
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