diff --git a/meson.build b/meson.build
index 392c56e01..00c2f1e13 100644
--- a/meson.build
+++ b/meson.build
@@ -262,6 +262,9 @@ else
   if get_option('plugin_uefi_pk')
     error('plugin_uefi_pk needs -Dgnutls=true to work')
   endif
+  if get_option('plugin_synaptics_rmi')
+    error('plugin_synaptics_rmi needs -Dgnutls=true to work')
+  endif
 endif
 
 platform_deps = []
diff --git a/meson_options.txt b/meson_options.txt
index 39c232778..d38840056 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -17,6 +17,7 @@ option('plugin_dell', type : 'boolean', value : true, description : 'enable Dell
 option('plugin_dummy', type : 'boolean', value : false, description : 'enable the dummy device')
 option('plugin_emmc', type : 'boolean', value : true, description : 'enable eMMC support')
 option('plugin_synaptics_mst', type: 'boolean', value: true, description : 'enable Synaptics MST hub support')
+option('plugin_synaptics_rmi', type: 'boolean', value: true, description : 'enable Synaptics RMI support')
 option('plugin_thunderbolt', type : 'boolean', value : true, description : 'enable Thunderbolt support')
 option('plugin_redfish', type : 'boolean', value : true, description : 'enable Redfish support')
 option('plugin_uefi_capsule', type : 'boolean', value : true, description : 'enable UEFI capsule support')
diff --git a/plugins/meson.build b/plugins/meson.build
index 55ce7ebf9..8f9dae448 100644
--- a/plugins/meson.build
+++ b/plugins/meson.build
@@ -25,11 +25,14 @@ subdir('ata')
 subdir('elantp')
 subdir('optionrom')
 subdir('superio')
-subdir('synaptics-rmi')
 subdir('thelio-io')
 subdir('wacom-raw')
 endif
 
+if get_option('gudev') and get_option('plugin_synaptics_rmi')
+subdir('synaptics-rmi')
+endif
+
 if get_option('gudev') and get_option('gusb')
 subdir('logitech-hidpp')
 endif
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-common.c b/plugins/synaptics-rmi/fu-synaptics-rmi-common.c
index 3282233d6..7455ff425 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-common.c
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-common.c
@@ -14,6 +14,9 @@
 
 #include <gio/gio.h>
 
+#include <gnutls/abstract.h>
+#include <gnutls/crypto.h>
+
 #include "fu-common.h"
 #include "fu-io-channel.h"
 #include "fu-synaptics-rmi-common.h"
@@ -30,6 +33,14 @@
 #define RMI_FUNCTION_VERSION_MASK		0x60
 #define RMI_FUNCTION_INTERRUPT_SOURCES_MASK	0x7
 
+
+typedef guchar gnutls_data_t;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(gnutls_data_t, gnutls_free)
+G_DEFINE_AUTO_CLEANUP_FREE_FUNC(gnutls_pubkey_t, gnutls_pubkey_deinit, NULL)
+#pragma clang diagnostic pop
+
 guint32
 fu_synaptics_rmi_generate_checksum (const guint8 *data, gsize len)
 {
@@ -100,3 +111,67 @@ fu_synaptics_rmi_device_writeln (const gchar *fn, const gchar *buf, GError **err
 	return fu_io_channel_write_raw (io, (const guint8 *) buf, strlen (buf),
 					1000, FU_IO_CHANNEL_FLAG_NONE, error);
 }
+
+gboolean
+fu_synaptics_verify_sha256_signature (GBytes *payload,
+				      GBytes *pubkey,
+				      GBytes *signature,
+				      GError **error)
+{
+	gnutls_datum_t hash;
+	gnutls_datum_t m;
+	gnutls_datum_t e;
+	gnutls_datum_t sig;
+	gnutls_hash_hd_t sha2;
+	g_auto(gnutls_pubkey_t) pub = NULL;
+	gint ec;
+	guint8 exponent[] = { 1, 0, 1 };
+	guint hash_length = gnutls_hash_get_len (GNUTLS_DIG_SHA256);
+	g_autoptr(gnutls_data_t) hash_data = NULL;
+
+	/* hash firmware data */
+	hash_data = gnutls_malloc (hash_length);
+	gnutls_hash_init (&sha2, GNUTLS_DIG_SHA256);
+	gnutls_hash (sha2, g_bytes_get_data (payload, NULL), g_bytes_get_size (payload));
+	gnutls_hash_deinit (sha2, hash_data);
+
+	/* hash */
+	hash.size = hash_length;
+	hash.data = hash_data;
+
+	/* modulus */
+	m.size = g_bytes_get_size (pubkey);
+	m.data = (guint8 *) g_bytes_get_data (pubkey, NULL);
+
+	/* exponent */
+	e.size = sizeof(exponent);
+	e.data = exponent;
+
+	/* signature */
+	sig.size = g_bytes_get_size (signature);
+	sig.data = (guint8 *) g_bytes_get_data (signature, NULL);
+
+	gnutls_pubkey_init (&pub);
+	ec = gnutls_pubkey_import_rsa_raw (pub, &m, &e);
+	if (ec < 0) {
+		g_set_error (error,
+			     FWUPD_ERROR,
+			     FWUPD_ERROR_NOT_SUPPORTED,
+			     "failed to import RSA key: %s",
+			     gnutls_strerror (ec));
+		return FALSE;
+	}
+	ec = gnutls_pubkey_verify_hash2 (pub, GNUTLS_SIGN_RSA_SHA256,
+					 0, &hash, &sig);
+	if (ec < 0) {
+		g_set_error (error,
+			     FWUPD_ERROR,
+			     FWUPD_ERROR_NOT_SUPPORTED,
+			     "failed to verify firmware: %s",
+			     gnutls_strerror (ec));
+		return FALSE;
+	}
+
+	/* success */
+	return TRUE;
+}
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-common.h b/plugins/synaptics-rmi/fu-synaptics-rmi-common.h
index a89f7725c..d2fe93a93 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-common.h
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-common.h
@@ -34,3 +34,7 @@ FuSynapticsRmiFunction *fu_synaptics_rmi_function_parse	(GByteArray	*buf,
 gboolean	 fu_synaptics_rmi_device_writeln	(const gchar	*fn,
 							 const gchar	*buf,
 							 GError		**error);
+gboolean	 fu_synaptics_verify_sha256_signature	(GBytes		*payload,
+							 GBytes		*pubkey,
+							 GBytes		*signature,
+							 GError		**error);
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-device.c b/plugins/synaptics-rmi/fu-synaptics-rmi-device.c
index ba95089c1..16892de49 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-device.c
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-device.c
@@ -91,6 +91,7 @@ typedef struct
 	FuSynapticsRmiFunction	*f01;
 	FuSynapticsRmiFunction	*f34;
 	guint8			 current_page;
+	guint16			 sig_size;	/* 0x0 for non-secure update */
 } FuSynapticsRmiDevicePrivate;
 
 G_DEFINE_TYPE_WITH_PRIVATE (FuSynapticsRmiDevice, fu_synaptics_rmi_device, FU_TYPE_UDEV_DEVICE)
@@ -127,6 +128,7 @@ fu_synaptics_rmi_device_to_string (FuUdevDevice *device, guint idt, GString *str
 	FuSynapticsRmiDevice *self = FU_SYNAPTICS_RMI_DEVICE (device);
 	FuSynapticsRmiDevicePrivate *priv = GET_PRIVATE (self);
 	fu_common_string_append_kx (str, idt, "CurrentPage", priv->current_page);
+	fu_common_string_append_kx (str, idt, "SigSize", priv->sig_size);
 	if (priv->f34 != NULL) {
 		fu_common_string_append_kx (str, idt, "BlVer",
 					    priv->f34->function_version + 0x5);
@@ -265,6 +267,19 @@ fu_synaptics_rmi_device_read (FuSynapticsRmiDevice *self, guint16 addr, gsize re
 	return g_steal_pointer (&buf);
 }
 
+GByteArray *
+fu_synaptics_rmi_device_read_packet_register (FuSynapticsRmiDevice *self,
+					      guint16 addr,
+					      gsize req_sz,
+					      GError **error)
+{
+	g_set_error_literal (error,
+			     FWUPD_ERROR,
+			     FWUPD_ERROR_NOT_SUPPORTED,
+			     "packet register reads not supported");
+	return NULL;
+}
+
 gboolean
 fu_synaptics_rmi_device_write (FuSynapticsRmiDevice *self, guint16 addr, GByteArray *req, GError **error)
 {
@@ -401,6 +416,21 @@ fu_synaptics_rmi_device_scan_pdt (FuSynapticsRmiDevice *self, GError **error)
 	return TRUE;
 }
 
+void
+fu_synaptics_rmi_device_set_sig_size (FuSynapticsRmiDevice *self,
+					guint16 sig_size)
+{
+	FuSynapticsRmiDevicePrivate *priv = GET_PRIVATE (self);
+	priv->sig_size = sig_size;
+}
+
+guint16
+fu_synaptics_rmi_device_get_sig_size (FuSynapticsRmiDevice *self)
+{
+	FuSynapticsRmiDevicePrivate *priv = GET_PRIVATE (self);
+	return priv->sig_size;
+}
+
 typedef enum {
 	HID_RMI4_MODE_MOUSE				= 0,
 	HID_RMI4_MODE_ATTN_REPORTS			= 1,
@@ -670,7 +700,8 @@ fu_synaptics_rmi_device_prepare_firmware (FuDevice *device,
 	bytes_bin = fu_firmware_get_image_by_id_bytes (firmware, "ui", error);
 	if (bytes_bin == NULL)
 		return NULL;
-	size_expected = (gsize) priv->flash.block_count_fw * (gsize) priv->flash.block_size;
+	size_expected = ((gsize) priv->flash.block_count_fw * (gsize) priv->flash.block_size) +
+			fu_synaptics_rmi_firmware_get_sig_size (FU_SYNAPTICS_RMI_FIRMWARE (firmware));
 	if (g_bytes_get_size (bytes_bin) != size_expected) {
 		g_set_error (error,
 			     FWUPD_ERROR,
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-device.h b/plugins/synaptics-rmi/fu-synaptics-rmi-device.h
index 058ca942a..22968515a 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-device.h
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-device.h
@@ -54,6 +54,10 @@ GByteArray		*fu_synaptics_rmi_device_read		(FuSynapticsRmiDevice	*self,
 								 guint16		 addr,
 								 gsize			 req_sz,
 								 GError			**error);
+GByteArray		*fu_synaptics_rmi_device_read_packet_register (FuSynapticsRmiDevice	*self,
+								 guint16		 addr,
+								 gsize			 req_sz,
+								 GError			**error);
 gboolean		 fu_synaptics_rmi_device_write		(FuSynapticsRmiDevice	*self,
 								 guint16		 addr,
 								 GByteArray		*req,
@@ -74,3 +78,6 @@ gboolean		 fu_synaptics_rmi_device_rebind_driver	(FuSynapticsRmiDevice	*self,
 								 GError			**error);
 gboolean		 fu_synaptics_rmi_device_poll_wait	(FuSynapticsRmiDevice	*self,
 								 GError			**error);
+void			 fu_synaptics_rmi_device_set_sig_size	(FuSynapticsRmiDevice	*self,
+								 guint16		 sig_size);
+guint16			 fu_synaptics_rmi_device_get_sig_size	(FuSynapticsRmiDevice	*self);
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.c b/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.c
index 1dc62b69f..8f02d206d 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.c
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.c
@@ -31,6 +31,7 @@ struct _FuSynapticsRmiFirmware {
 	guint32			 package_id;
 	guint16			 product_info;
 	gchar			*product_id;
+	guint32			 sig_size;
 };
 
 G_DEFINE_TYPE (FuSynapticsRmiFirmware, fu_synaptics_rmi_firmware, FU_TYPE_FIRMWARE)
@@ -42,6 +43,7 @@ G_DEFINE_TYPE (FuSynapticsRmiFirmware, fu_synaptics_rmi_firmware, FU_TYPE_FIRMWA
 #define RMI_IMG_CONFIG_SIZE_OFFSET		0x0c
 #define RMI_IMG_PACKAGE_ID_OFFSET		0x1a
 #define RMI_IMG_FW_BUILD_ID_OFFSET		0x50
+#define RMI_IMG_SIGNATURE_SIZE_OFFSET		0x54
 #define RMI_IMG_PRODUCT_ID_OFFSET		0x10
 #define RMI_IMG_PRODUCT_INFO_OFFSET		0x1e
 #define RMI_IMG_FW_OFFSET			0x100
@@ -174,6 +176,7 @@ fu_synaptics_rmi_firmware_to_string (FuFirmware *firmware, guint idt, GString *s
 	fu_common_string_append_kx (str, idt, "BuildId", self->build_id);
 	fu_common_string_append_kx (str, idt, "PackageId", self->package_id);
 	fu_common_string_append_kx (str, idt, "ProductInfo", self->product_info);
+	fu_common_string_append_kx (str, idt, "SigSize", self->sig_size);
 }
 
 static gboolean
@@ -318,6 +321,7 @@ fu_synaptics_rmi_firmware_parse_v10 (FuFirmware *firmware, GBytes *fw, GError **
 static gboolean
 fu_synaptics_rmi_firmware_parse_v0x (FuFirmware *firmware, GBytes *fw, GError **error)
 {
+	FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE (firmware);
 	guint32 cfg_sz;
 	guint32 img_sz = 0;
 	gsize sz = 0;
@@ -331,6 +335,15 @@ fu_synaptics_rmi_firmware_parse_v0x (FuFirmware *firmware, GBytes *fw, GError **
 					 error))
 		return FALSE;
 	if (img_sz > 0) {
+		/* payload, then signature appended */
+		if (self->sig_size > 0) {
+			img_sz -= self->sig_size;
+			if (!fu_synaptics_rmi_firmware_add_image (firmware, "sig", fw,
+								  RMI_IMG_FW_OFFSET + img_sz,
+								  self->sig_size,
+								  error))
+				return FALSE;
+		}
 		if (!fu_synaptics_rmi_firmware_add_image (firmware, "ui", fw,
 							  RMI_IMG_FW_OFFSET,
 							  img_sz, error))
@@ -363,6 +376,7 @@ fu_synaptics_rmi_firmware_parse (FuFirmware *firmware,
 	FuSynapticsRmiFirmware *self = FU_SYNAPTICS_RMI_FIRMWARE (firmware);
 	gsize sz = 0;
 	guint32 checksum_calculated;
+	guint32 firmware_size = 0;
 	const guint8 *data = g_bytes_get_data (fw, &sz);
 
 	/* check minimum size */
@@ -425,6 +439,12 @@ fu_synaptics_rmi_firmware_parse (FuFirmware *firmware,
 					 G_LITTLE_ENDIAN,
 					 error))
 		return FALSE;
+	if (!fu_common_read_uint32_safe (data, sz,
+					 RMI_IMG_IMAGE_SIZE_OFFSET,
+					 &firmware_size,
+					 G_LITTLE_ENDIAN,
+					 error))
+		return FALSE;
 
 	/* parse partitions, but ignore lockdown */
 	switch (self->bootloader_version) {
@@ -433,6 +453,14 @@ fu_synaptics_rmi_firmware_parse (FuFirmware *firmware,
 	case 4:
 	case 5:
 	case 6:
+		if ((self->io & 0x10) >> 1) {
+			if (!fu_common_read_uint32_safe (data, sz,
+							 RMI_IMG_SIGNATURE_SIZE_OFFSET,
+							 &self->sig_size,
+							 G_LITTLE_ENDIAN,
+							 error))
+				return FALSE;
+		}
 		if (!fu_synaptics_rmi_firmware_parse_v0x (firmware, fw, error))
 			return FALSE;
 		self->kind = RMI_FIRMWARE_KIND_0X;
@@ -455,6 +483,12 @@ fu_synaptics_rmi_firmware_parse (FuFirmware *firmware,
 	return TRUE;
 }
 
+guint32
+fu_synaptics_rmi_firmware_get_sig_size (FuSynapticsRmiFirmware *self)
+{
+	return self->sig_size;
+}
+
 static GBytes *
 fu_synaptics_rmi_firmware_write_v0x (FuFirmware *firmware, GError **error)
 {
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.h b/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.h
index ff9686d89..bb2e10660 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.h
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-firmware.h
@@ -12,3 +12,4 @@
 G_DECLARE_FINAL_TYPE (FuSynapticsRmiFirmware, fu_synaptics_rmi_firmware, FU, SYNAPTICS_RMI_FIRMWARE, FuFirmware)
 
 FuFirmware	*fu_synaptics_rmi_firmware_new			(void);
+guint32		 fu_synaptics_rmi_firmware_get_sig_size		(FuSynapticsRmiFirmware	*self);
diff --git a/plugins/synaptics-rmi/fu-synaptics-rmi-v5-device.c b/plugins/synaptics-rmi/fu-synaptics-rmi-v5-device.c
index dfcd123d7..2918b562e 100644
--- a/plugins/synaptics-rmi/fu-synaptics-rmi-v5-device.c
+++ b/plugins/synaptics-rmi/fu-synaptics-rmi-v5-device.c
@@ -10,6 +10,7 @@
 
 #include "fu-chunk.h"
 #include "fu-common.h"
+#include "fu-synaptics-rmi-firmware.h"
 #include "fu-synaptics-rmi-v5-device.h"
 
 #include "fwupd-error.h"
@@ -18,6 +19,7 @@
 #define RMI_F34_ERASE_ALL				0x03
 #define RMI_F34_WRITE_LOCKDOWN_BLOCK			0x04
 #define RMI_F34_WRITE_CONFIG_BLOCK			0x06
+#define RMI_F34_WRITE_SIGNATURE				0x0b
 #define RMI_F34_ENABLE_FLASH_PROG			0x0f
 
 #define RMI_F34_BLOCK_SIZE_OFFSET			1
@@ -118,19 +120,110 @@ fu_synaptics_rmi_v5_device_write_block (FuSynapticsRmiDevice *self,
 	return TRUE;
 }
 
+static gboolean
+fu_synaptics_rmi_v5_device_secure_check (FuDevice *device,
+					 GBytes *payload,
+					 GBytes *signature,
+					 GError **error)
+{
+	FuSynapticsRmiDevice *self = FU_SYNAPTICS_RMI_DEVICE (device);
+	FuSynapticsRmiFunction *f34;
+	guint16 rsa_pubkey_len = fu_synaptics_rmi_device_get_sig_size (self) / 8;
+	guint16 rsa_block_cnt = rsa_pubkey_len / 3;
+	guint16 rsa_block_remain = rsa_pubkey_len % 3;
+	g_autoptr(GByteArray) pubkey_buf = g_byte_array_new ();
+	g_autoptr(GBytes) pubkey = NULL;
+
+	if (g_getenv ("FWUPD_SYNAPTICS_RMI_VERBOSE") != NULL)
+		fu_common_dump_bytes (G_LOG_DOMAIN, "Signature", signature);
+
+	f34 = fu_synaptics_rmi_device_get_function (self, 0x34, error);
+	if (f34 == NULL)
+		return FALSE;
+
+	/* parse RSA public key modulus */
+	if (rsa_block_remain > 0)
+		rsa_block_cnt += 1;
+	for (guint retries = 0; ; retries++) {
+		/* need read another register to reset the offset of packet register */
+		if (!fu_synaptics_rmi_v5_device_query_status (self, error)) {
+			g_prefix_error (error, "failed to read status: ");
+			return FALSE;
+		}
+		for (guint16 block_num = 0; block_num < rsa_block_cnt; block_num++) {
+			g_autoptr(GByteArray) res = NULL;
+			res = fu_synaptics_rmi_device_read_packet_register (self,
+									    f34->query_base + 14, /* addr of flash properties + 5 */
+									    0x3,
+									    error);
+			if (res == NULL)
+				return FALSE;
+			if (res->len != 0x3)
+				g_debug ("read %u bytes in return", res->len);
+			if (rsa_block_remain && block_num + 1 == rsa_block_cnt) {
+				g_byte_array_remove_range (res,
+							   rsa_block_remain,
+							   res->len - rsa_block_remain);
+			}
+			for (guint i = 0 ; i < res->len / 2 ; i++) {
+				guint8 tmp = res->data[i];
+				res->data[i] = res->data[res->len - i - 1];
+				res->data[res->len - i - 1] = tmp;
+			}
+			if (rsa_block_remain && block_num + 1 == rsa_block_cnt) {
+				g_byte_array_prepend (pubkey_buf, res->data, rsa_block_remain);
+			} else {
+				g_byte_array_prepend (pubkey_buf, res->data, res->len);
+			}
+		}
+		if (rsa_pubkey_len != pubkey_buf->len) {
+			if (retries++ > 2) {
+				g_set_error (error,
+					     G_IO_ERROR, G_IO_ERROR_FAILED,
+					     "RSA public key length not matched %u: after %u retries: ",
+					     pubkey_buf->len, retries);
+				return FALSE;
+			}
+			g_byte_array_set_size (pubkey_buf, 0);
+			continue;
+		}
+
+		/* success */
+		break;
+	}
+	if (g_getenv ("FWUPD_SYNAPTICS_RMI_VERBOSE") != NULL) {
+		fu_common_dump_full (G_LOG_DOMAIN, "RSA public key",
+				     pubkey_buf->data, pubkey_buf->len,
+				     16, FU_DUMP_FLAGS_NONE);
+	}
+
+	/* sanity check size */
+	if (rsa_pubkey_len != pubkey_buf->len) {
+		g_set_error (error,
+			     FWUPD_ERROR,
+			     FWUPD_ERROR_NOT_SUPPORTED,
+			     "RSA public key length did not match: %u != %u: ",
+			     rsa_pubkey_len, pubkey_buf->len);
+		return FALSE;
+	}
+	pubkey = g_bytes_new (pubkey_buf->data, pubkey_buf->len);
+	return fu_synaptics_verify_sha256_signature (payload, pubkey, signature, error);
+}
+
 gboolean
 fu_synaptics_rmi_v5_device_write_firmware (FuDevice *device,
 					   FuFirmware *firmware,
 					   FwupdInstallFlags flags,
 					   GError **error)
 {
-
 	FuSynapticsRmiDevice *self = FU_SYNAPTICS_RMI_DEVICE (device);
 	FuSynapticsRmiFlash *flash = fu_synaptics_rmi_device_get_flash (self);
 	FuSynapticsRmiFunction *f34;
+	FuSynapticsRmiFirmware *rmi_firmware = FU_SYNAPTICS_RMI_FIRMWARE (firmware);
 	guint32 address;
 	g_autoptr(GBytes) bytes_bin = NULL;
 	g_autoptr(GBytes) bytes_cfg = NULL;
+	g_autoptr(GBytes) signature_bin = NULL;
 	g_autoptr(GPtrArray) chunks_bin = NULL;
 	g_autoptr(GPtrArray) chunks_cfg = NULL;
 	g_autoptr(GByteArray) req_addr = g_byte_array_new ();
@@ -151,6 +244,22 @@ fu_synaptics_rmi_v5_device_write_firmware (FuDevice *device,
 		g_prefix_error (error, "not idle: ");
 		return FALSE;
 	}
+	if (fu_synaptics_rmi_firmware_get_sig_size (rmi_firmware) == 0 &&
+	    fu_synaptics_rmi_device_get_sig_size (self) != 0) {
+		g_set_error_literal (error,
+				     FWUPD_ERROR,
+				     FWUPD_ERROR_INVALID_FILE,
+				     "device secure but firmware not secure");
+		return FALSE;
+	}
+	if (fu_synaptics_rmi_firmware_get_sig_size (rmi_firmware) != 0 &&
+	    fu_synaptics_rmi_device_get_sig_size (self) == 0) {
+		g_set_error_literal (error,
+				     FWUPD_ERROR,
+				     FWUPD_ERROR_INVALID_FILE,
+				     "device not secure but firmware secure");
+		return FALSE;
+	}
 
 	/* f34 */
 	f34 = fu_synaptics_rmi_device_get_function (self, 0x34, error);
@@ -165,6 +274,18 @@ fu_synaptics_rmi_v5_device_write_firmware (FuDevice *device,
 	if (bytes_cfg == NULL)
 		return FALSE;
 
+	/* verify signature if set */
+	signature_bin = fu_firmware_get_image_by_id_bytes (firmware, "sig", NULL);
+	if (signature_bin != NULL) {
+		if (!fu_synaptics_rmi_v5_device_secure_check (device,
+							      bytes_bin,
+							      signature_bin,
+							      error)) {
+			g_prefix_error (error, "secure check failed: ");
+			return FALSE;
+		}
+	}
+
 	/* disable powersaving */
 	if (!fu_synaptics_rmi_device_disable_sleep (self, error)) {
 		g_prefix_error (error, "failed to disable sleep: ");
@@ -220,6 +341,35 @@ fu_synaptics_rmi_v5_device_write_firmware (FuDevice *device,
 					     (gsize) chunks_bin->len + chunks_cfg->len);
 	}
 
+	/* payload signature */
+	if (signature_bin != NULL &&
+	    fu_synaptics_rmi_device_get_sig_size (self) != 0) {
+		g_autoptr(GPtrArray) chunks_sig = NULL;
+		chunks_sig = fu_chunk_array_new_from_bytes (signature_bin,
+							    0x00,	/* start addr */
+							    0x00,	/* page_sz */
+							    flash->block_size);
+		if (!fu_synaptics_rmi_device_write (self, f34->data_base, req_addr, error)) {
+			g_prefix_error (error, "failed to write 1st address zero: ");
+			return FALSE;
+		}
+		for (guint i = 0; i < chunks_sig->len; i++) {
+			FuChunk *chk = g_ptr_array_index (chunks_sig, i);
+			if (!fu_synaptics_rmi_v5_device_write_block (self,
+								     RMI_F34_WRITE_SIGNATURE,
+								     address,
+								     chk->data,
+								     chk->data_sz,
+								     error)) {
+				g_prefix_error (error, "failed to write bin block %u: ", chk->idx);
+				return FALSE;
+			}
+			fu_device_set_progress_full (device, (gsize) i,
+						     (gsize) chunks_bin->len + chunks_cfg->len);
+		}
+		g_usleep (1000 * 1000);
+	}
+
 	/* program the configuration image */
 	if (!fu_synaptics_rmi_device_write (self, f34->data_base, req_addr, error)) {
 		g_prefix_error (error, "failed to 2nd write address zero: ");
@@ -250,8 +400,10 @@ fu_synaptics_rmi_v5_device_setup (FuSynapticsRmiDevice *self, GError **error)
 {
 	FuSynapticsRmiFunction *f34;
 	FuSynapticsRmiFlash *flash = fu_synaptics_rmi_device_get_flash (self);
+	guint8 flash_properties2 = 0;
 	g_autoptr(GByteArray) f34_data0 = NULL;
 	g_autoptr(GByteArray) f34_data2 = NULL;
+	g_autoptr(GByteArray) buf_flash_properties2 = NULL;
 
 	/* f34 */
 	f34 = fu_synaptics_rmi_device_get_function (self, 0x34, error);
@@ -267,6 +419,45 @@ fu_synaptics_rmi_v5_device_setup (FuSynapticsRmiDevice *self, GError **error)
 	flash->bootloader_id[0] = f34_data0->data[0];
 	flash->bootloader_id[1] = f34_data0->data[1];
 
+	/* get flash properties */
+	buf_flash_properties2 = fu_synaptics_rmi_device_read (self, f34->query_base + 0x9, 1, error);
+	if (buf_flash_properties2 == NULL) {
+		g_prefix_error (error, "failed to read Flash Properties 2: ");
+		return FALSE;
+	}
+	if (!fu_common_read_uint8_safe (buf_flash_properties2->data,
+					buf_flash_properties2->len,
+					0x0, /* offset */
+					&flash_properties2,
+					error)) {
+		g_prefix_error (error, "failed to parse Flash Properties 2: ");
+		return FALSE;
+	}
+	if (flash_properties2 & 0x01) {
+		guint16 sig_size = 0;
+		g_autoptr(GByteArray) buf_rsa_key = NULL;
+		buf_rsa_key = fu_synaptics_rmi_device_read (self,
+							    f34->query_base + 0x9 + 0x1,
+							    2,
+							    error);
+		if (buf_rsa_key == NULL) {
+			g_prefix_error (error, "failed to read RSA key length: ");
+			return FALSE;
+		}
+		if (!fu_common_read_uint16_safe (buf_rsa_key->data,
+						 buf_rsa_key->len,
+						 0x0, /* offset */
+						 &sig_size,
+						 G_LITTLE_ENDIAN,
+						 error)) {
+			g_prefix_error (error, "failed to parse RSA key length: ");
+			return FALSE;
+		}
+		fu_synaptics_rmi_device_set_sig_size (self, sig_size);
+	} else {
+		fu_synaptics_rmi_device_set_sig_size (self, 0);
+	}
+
 	/* get flash properties */
 	f34_data2 = fu_synaptics_rmi_device_read (self, f34->query_base + 0x2, 0x7, error);
 	if (f34_data2 == NULL)
diff --git a/plugins/synaptics-rmi/meson.build b/plugins/synaptics-rmi/meson.build
index fa539157f..ddfbe7693 100644
--- a/plugins/synaptics-rmi/meson.build
+++ b/plugins/synaptics-rmi/meson.build
@@ -25,6 +25,7 @@ shared_module('fu_plugin_synaptics_rmi',
   c_args : cargs,
   dependencies : [
     plugin_deps,
+    gnutls,
   ],
   link_with : [
     fwupd,