milenage: Add function to compute OPC from OP and K
diff --git a/src/gsm/milenage/milenage.h b/src/gsm/milenage/milenage.h
index d5054d6..a91e946 100644
--- a/src/gsm/milenage/milenage.h
+++ b/src/gsm/milenage/milenage.h
@@ -30,4 +30,6 @@
 int milenage_f2345(const u8 *opc, const u8 *k, const u8 *_rand,
 		   u8 *res, u8 *ck, u8 *ik, u8 *ak, u8 *akstar);
 
+int milenage_opc_gen(u8 *opc, const u8 *k, const u8 *op);
+
 #endif /* MILENAGE_H */