Apply security to Deregistration Request (UE Originating)

srsue/src/stack/upper/nas_5g.cc

@@ -622,6 +622,8 @@ int nas_5g::send_deregistration_request_ue_originating(bool switch_off)
 
   nas_5gs_msg                              nas_msg;
   deregistration_request_ue_originating_t& deregistration_request = nas_msg.set_deregistration_request_ue_originating();
+  nas_msg.hdr.security_header_type = nas_5gs_hdr::security_header_type_opts::integrity_protected_and_ciphered;
+  nas_msg.hdr.sequence_number      = ctxt_base.tx_count;
 
   // Note 5.5.2.2.2 : AMF does not send a Deregistration Accept NAS message if De-registration type IE indicates "switch
   // off"
@@ -655,10 +657,17 @@ int nas_5g::send_deregistration_request_ue_originating(bool switch_off)
   }
 
   logger.info("Sending Deregistration Request (UE Originating)");
-  rrc_nr->write_sdu(std::move(pdu));
+  cipher_encrypt(pdu.get());
+  integrity_generate(&ctxt_base.k_nas_int[16],
+                     ctxt_base.tx_count,
+                     SECURITY_DIRECTION_UPLINK,
+                     &pdu->msg[SEQ_5G_OFFSET],
+                     pdu->N_bytes - SEQ_5G_OFFSET,
+                     &pdu->msg[MAC_5G_OFFSET]);
 
+  rrc_nr->write_sdu(std::move(pdu));
+  ctxt_base.tx_count++;
   reset_pdu_sessions();
-
   // TODO: Delete / Reset context (ctxt & ctxt_5g)
 
   return SRSASN_SUCCESS;