diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index b6903d8..f969a35 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -77,6 +77,10 @@
 #define MBOX_FCS_RANDOM_GEN				0x80
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1
+#define MBOX_FCS_IMPORT_CS_KEY				0xA5
+#define MBOX_FCS_EXPORT_CS_KEY				0xA6
+#define MBOX_FCS_REMOVE_CS_KEY				0xA7
+#define MBOX_FCS_GET_CS_KEY_INFO			0xA8
 
 /* PSG SIGMA Commands */
 #define MBOX_PSG_SIGMA_TEARDOWN				0xD5