gsm0808: Add utils for Encryption Information
The planned support for true A over IP requires the encoding of
the an Encryption Information element (see also BSS_MAP_MSG_CIPHER_MODE_CMD).
This commt adds encoding/decoding functionality and tests for
the element mentioned above, however, it is not yet actively used.
Change-Id: I8262050a9d9fd3f17462cfbb046c6e034dccc6fb
diff --git a/tests/gsm0808/gsm0808_test.c b/tests/gsm0808/gsm0808_test.c
index 0dd9e84..5fe9c87 100644
--- a/tests/gsm0808/gsm0808_test.c
+++ b/tests/gsm0808/gsm0808_test.c
@@ -571,6 +571,45 @@
msgb_free(msg);
}
+static void test_gsm0808_enc_dec_encrypt_info()
+{
+ struct gsm0808_encrypt_info enc_ei;
+ struct gsm0808_encrypt_info dec_ei;
+ struct msgb *msg;
+ uint8_t ei_enc_expected[] =
+ { GSM0808_IE_ENCRYPTION_INFORMATION, 0x09, 0x03, 0xaa, 0xbb,
+ 0xcc, 0xdd, 0xee, 0xff, 0x23, 0x42
+ };
+ uint8_t rc_enc;
+ int rc_dec;
+
+ memset(&enc_ei, 0, sizeof(enc_ei));
+ enc_ei.perm_algo[0] = GSM0808_ALG_ID_A5_0;
+ enc_ei.perm_algo[1] = GSM0808_ALG_ID_A5_1;
+ enc_ei.perm_algo_len = 2;
+ enc_ei.key[0] = 0xaa;
+ enc_ei.key[1] = 0xbb;
+ enc_ei.key[2] = 0xcc;
+ enc_ei.key[3] = 0xdd;
+ enc_ei.key[4] = 0xee;
+ enc_ei.key[5] = 0xff;
+ enc_ei.key[6] = 0x23;
+ enc_ei.key[7] = 0x42;
+ enc_ei.key_len = 8;
+
+ msg = msgb_alloc(1024, "output buffer");
+ rc_enc = gsm0808_enc_encrypt_info(msg, &enc_ei);
+ OSMO_ASSERT(rc_enc == 11);
+ OSMO_ASSERT(memcmp(ei_enc_expected, msg->data, msg->len) == 0);
+
+ rc_dec = gsm0808_dec_encrypt_info(&dec_ei, msg->data + 2, msg->len - 2);
+ OSMO_ASSERT(rc_dec == 9);
+
+ OSMO_ASSERT(memcmp(&enc_ei, &dec_ei, sizeof(enc_ei)) == 0);
+
+ msgb_free(msg);
+}
+
int main(int argc, char **argv)
{
printf("Testing generation of GSM0808 messages\n");
@@ -597,6 +636,7 @@
test_gsm0808_enc_dec_speech_codec_ext_with_cfg();
test_gsm0808_enc_dec_speech_codec_list();
test_gsm0808_enc_dec_channel_type();
+ test_gsm0808_enc_dec_encrypt_info();
printf("Done\n");
return EXIT_SUCCESS;