diff --git a/plat/intel/soc/common/include/socfpga_fcs.h b/plat/intel/soc/common/include/socfpga_fcs.h
index 3fd71c1..cdb4060 100644
--- a/plat/intel/soc/common/include/socfpga_fcs.h
+++ b/plat/intel/soc/common/include/socfpga_fcs.h
@@ -80,6 +80,7 @@
 #define FCS_ECDSA_GET_PUBKEY_MAX_WORD_SIZE			5U
 #define FCS_ECDSA_SHA2_DATA_SIGN_CMD_MAX_WORD_SIZE		7U
 #define FCS_ECDSA_SHA2_DATA_SIG_VERIFY_CMD_MAX_WORD_SIZE	43U
+#define FCS_ECDH_REQUEST_CMD_MAX_WORD_SIZE			29U
 /* FCS Payload Structure */
 typedef struct fcs_rng_payload_t {
 	uint32_t session_id;
@@ -264,6 +265,14 @@
 				uint64_t dst_addr, uint32_t *dst_size,
 				uint32_t *mbox_error);
 
+int intel_fcs_ecdh_request_init(uint32_t session_id, uint32_t context_id,
+				uint32_t key_id, uint32_t param_size,
+				uint64_t param_data, uint32_t *mbox_error);
+int intel_fcs_ecdh_request_finalize(uint32_t session_id, uint32_t context_id,
+				uint32_t src_addr, uint32_t src_size,
+				uint64_t dst_addr, uint32_t *dst_size,
+				uint32_t *mbox_error);
+
 int intel_fcs_aes_crypt_init(uint32_t session_id, uint32_t context_id,
 				uint32_t key_id, uint64_t param_addr,
 				uint32_t param_size, uint32_t *mbox_error);
diff --git a/plat/intel/soc/common/include/socfpga_mailbox.h b/plat/intel/soc/common/include/socfpga_mailbox.h
index 042532c..f2780c2 100644
--- a/plat/intel/soc/common/include/socfpga_mailbox.h
+++ b/plat/intel/soc/common/include/socfpga_mailbox.h
@@ -81,6 +81,7 @@
 #define MBOX_FCS_ECDSA_SHA2_DATA_SIGN_REQ		0x85
 #define MBOX_FCS_ECDSA_SHA2_DATA_SIGN_VERIFY		0x87
 #define MBOX_FCS_ECDSA_GET_PUBKEY			0x88
+#define MBOX_FCS_ECDH_REQUEST				0x89
 #define MBOX_FCS_OPEN_CS_SESSION			0xA0
 #define MBOX_FCS_CLOSE_CS_SESSION			0xA1
 #define MBOX_FCS_IMPORT_CS_KEY				0xA5
diff --git a/plat/intel/soc/common/include/socfpga_sip_svc.h b/plat/intel/soc/common/include/socfpga_sip_svc.h
index 445fd64..9f966d3 100644
--- a/plat/intel/soc/common/include/socfpga_sip_svc.h
+++ b/plat/intel/soc/common/include/socfpga_sip_svc.h
@@ -103,6 +103,8 @@
 #define INTEL_SIP_SMC_FCS_ECDSA_SHA2_DATA_SIG_VERIFY_FINALIZE	0xC2000088
 #define INTEL_SIP_SMC_FCS_ECDSA_GET_PUBKEY_INIT			0xC2000089
 #define INTEL_SIP_SMC_FCS_ECDSA_GET_PUBKEY_FINALIZE		0xC200008B
+#define INTEL_SIP_SMC_FCS_ECDH_REQUEST_INIT			0xC200008C
+#define INTEL_SIP_SMC_FCS_ECDH_REQUEST_FINALIZE			0xC200008E
 
 #define INTEL_SIP_SMC_FCS_SHA_MODE_MASK				0xF
 #define INTEL_SIP_SMC_FCS_DIGEST_SIZE_MASK			0xF