bsc_api: Implement sending the cipher mode method
This will set the encryption algorithm, key and then
send the RR Cipher Mode message to the MS. The method
is also verifying the input.
diff --git a/openbsc/src/bsc_api.c b/openbsc/src/bsc_api.c
index 0dcb72b..566ead4 100644
--- a/openbsc/src/bsc_api.c
+++ b/openbsc/src/bsc_api.c
@@ -319,7 +319,23 @@
int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher,
const uint8_t *key, int len, int include_imeisv)
{
- return -1;
+ if (cipher > 0 && key == NULL) {
+ LOGP(DRSL, LOGL_ERROR, "Need to have an encrytpion key.\n");
+ return -1;
+ }
+
+ if (len > MAX_A5_KEY_LEN) {
+ LOGP(DRSL, LOGL_ERROR, "The key is too long: %d\n", len);
+ return -1;
+ }
+
+ conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher);
+ if (key) {
+ conn->lchan->encr.key_len = len;
+ memcpy(conn->lchan->encr.key, key, len);
+ }
+
+ return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv);
}
/*