libosmogsm: Factor out the C2 derivation function
3GPP specifies the C2 derivation function (generating GSM SRES from UMTS XRES)
independent of the MILENAGE algorithm. So instead of open-coding it in
milenage.c:gsm_milenage(), let's create a separate public function
osmo_auth_c2() similar to the already-existing osmo_auth_c3() function.
gsm_milenage() can then simply use that function.
Change-Id: I0e7cd55f5578f891cb6cc1b0442920ba5beddae4
diff --git a/src/gsm/libosmogsm.map b/src/gsm/libosmogsm.map
index e03e014..0e45dc1 100644
--- a/src/gsm/libosmogsm.map
+++ b/src/gsm/libosmogsm.map
@@ -585,6 +585,7 @@
osmo_auth_load;
osmo_auth_register;
osmo_auth_supported;
+osmo_auth_c2;
osmo_auth_c3;
osmo_sub_auth_type_names;