diff --git a/src/firmware_update.c b/src/firmware_update.c
new file mode 100644
index 0000000..59d1f9d
--- /dev/null
+++ b/src/firmware_update.c
@@ -0,0 +1,1568 @@
+#include "firmware_update.h"
+#include <endian.h>
+#include <string.h>
+
+/** @brief Check whether string type value is valid
+ *
+ *  @return true if string type value is valid, false if not
+ */
+static bool is_string_type_valid(uint8_t string_type)
+{
+	switch (string_type) {
+	case PLDM_STR_TYPE_UNKNOWN:
+		return false;
+	case PLDM_STR_TYPE_ASCII:
+	case PLDM_STR_TYPE_UTF_8:
+	case PLDM_STR_TYPE_UTF_16:
+	case PLDM_STR_TYPE_UTF_16LE:
+	case PLDM_STR_TYPE_UTF_16BE:
+		return true;
+	default:
+		return false;
+	}
+}
+
+/** @brief Return the length of the descriptor type described in firmware update
+ *         specification
+ *
+ *  @return length of the descriptor type if descriptor type is valid else
+ *          return 0
+ */
+static uint16_t get_descriptor_type_length(uint16_t descriptor_type)
+{
+	switch (descriptor_type) {
+
+	case PLDM_FWUP_PCI_VENDOR_ID:
+		return PLDM_FWUP_PCI_VENDOR_ID_LENGTH;
+	case PLDM_FWUP_IANA_ENTERPRISE_ID:
+		return PLDM_FWUP_IANA_ENTERPRISE_ID_LENGTH;
+	case PLDM_FWUP_UUID:
+		return PLDM_FWUP_UUID_LENGTH;
+	case PLDM_FWUP_PNP_VENDOR_ID:
+		return PLDM_FWUP_PNP_VENDOR_ID_LENGTH;
+	case PLDM_FWUP_ACPI_VENDOR_ID:
+		return PLDM_FWUP_ACPI_VENDOR_ID_LENGTH;
+	case PLDM_FWUP_IEEE_ASSIGNED_COMPANY_ID:
+		return PLDM_FWUP_IEEE_ASSIGNED_COMPANY_ID_LENGTH;
+	case PLDM_FWUP_SCSI_VENDOR_ID:
+		return PLDM_FWUP_SCSI_VENDOR_ID_LENGTH;
+	case PLDM_FWUP_PCI_DEVICE_ID:
+		return PLDM_FWUP_PCI_DEVICE_ID_LENGTH;
+	case PLDM_FWUP_PCI_SUBSYSTEM_VENDOR_ID:
+		return PLDM_FWUP_PCI_SUBSYSTEM_VENDOR_ID_LENGTH;
+	case PLDM_FWUP_PCI_SUBSYSTEM_ID:
+		return PLDM_FWUP_PCI_SUBSYSTEM_ID_LENGTH;
+	case PLDM_FWUP_PCI_REVISION_ID:
+		return PLDM_FWUP_PCI_REVISION_ID_LENGTH;
+	case PLDM_FWUP_PNP_PRODUCT_IDENTIFIER:
+		return PLDM_FWUP_PNP_PRODUCT_IDENTIFIER_LENGTH;
+	case PLDM_FWUP_ACPI_PRODUCT_IDENTIFIER:
+		return PLDM_FWUP_ACPI_PRODUCT_IDENTIFIER_LENGTH;
+	case PLDM_FWUP_ASCII_MODEL_NUMBER_LONG_STRING:
+		return PLDM_FWUP_ASCII_MODEL_NUMBER_LONG_STRING_LENGTH;
+	case PLDM_FWUP_ASCII_MODEL_NUMBER_SHORT_STRING:
+		return PLDM_FWUP_ASCII_MODEL_NUMBER_SHORT_STRING_LENGTH;
+	case PLDM_FWUP_SCSI_PRODUCT_ID:
+		return PLDM_FWUP_SCSI_PRODUCT_ID_LENGTH;
+	case PLDM_FWUP_UBM_CONTROLLER_DEVICE_CODE:
+		return PLDM_FWUP_UBM_CONTROLLER_DEVICE_CODE_LENGTH;
+	default:
+		return 0;
+	}
+}
+
+/** @brief Check whether ComponentResponse is valid
+ *
+ *  @return true if ComponentResponse is valid, false if not
+ */
+static bool is_comp_resp_valid(uint8_t comp_resp)
+{
+	switch (comp_resp) {
+	case PLDM_CR_COMP_CAN_BE_UPDATED:
+	case PLDM_CR_COMP_MAY_BE_UPDATEABLE:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/** @brief Check whether ComponentResponseCode is valid
+ *
+ *  @return true if ComponentResponseCode is valid, false if not
+ */
+static bool is_comp_resp_code_valid(uint8_t comp_resp_code)
+{
+	switch (comp_resp_code) {
+	case PLDM_CRC_COMP_CAN_BE_UPDATED:
+	case PLDM_CRC_COMP_COMPARISON_STAMP_IDENTICAL:
+	case PLDM_CRC_COMP_COMPARISON_STAMP_LOWER:
+	case PLDM_CRC_INVALID_COMP_COMPARISON_STAMP:
+	case PLDM_CRC_COMP_CONFLICT:
+	case PLDM_CRC_COMP_PREREQUISITES_NOT_MET:
+	case PLDM_CRC_COMP_NOT_SUPPORTED:
+	case PLDM_CRC_COMP_SECURITY_RESTRICTIONS:
+	case PLDM_CRC_INCOMPLETE_COMP_IMAGE_SET:
+	case PLDM_CRC_ACTIVE_IMAGE_NOT_UPDATEABLE_SUBSEQUENTLY:
+	case PLDM_CRC_COMP_VER_STR_IDENTICAL:
+	case PLDM_CRC_COMP_VER_STR_LOWER:
+		return true;
+
+	default:
+		if (comp_resp_code >=
+			PLDM_CRC_VENDOR_COMP_RESP_CODE_RANGE_MIN &&
+		    comp_resp_code <=
+			PLDM_CRC_VENDOR_COMP_RESP_CODE_RANGE_MAX) {
+			return true;
+		}
+		return false;
+	}
+}
+
+/** @brief Check whether ComponentCompatibilityResponse is valid
+ *
+ *  @return true if ComponentCompatibilityResponse is valid, false if not
+ */
+static bool is_comp_compatibility_resp_valid(uint8_t comp_compatibility_resp)
+{
+	switch (comp_compatibility_resp) {
+	case PLDM_CCR_COMP_CAN_BE_UPDATED:
+	case PLDM_CCR_COMP_CANNOT_BE_UPDATED:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/** @brief Check whether ComponentCompatibilityResponse Code is valid
+ *
+ *  @return true if ComponentCompatibilityResponse Code is valid, false if not
+ */
+static bool
+is_comp_compatibility_resp_code_valid(uint8_t comp_compatibility_resp_code)
+{
+	switch (comp_compatibility_resp_code) {
+	case PLDM_CCRC_NO_RESPONSE_CODE:
+	case PLDM_CCRC_COMP_COMPARISON_STAMP_IDENTICAL:
+	case PLDM_CCRC_COMP_COMPARISON_STAMP_LOWER:
+	case PLDM_CCRC_INVALID_COMP_COMPARISON_STAMP:
+	case PLDM_CCRC_COMP_CONFLICT:
+	case PLDM_CCRC_COMP_PREREQUISITES_NOT_MET:
+	case PLDM_CCRC_COMP_NOT_SUPPORTED:
+	case PLDM_CCRC_COMP_SECURITY_RESTRICTIONS:
+	case PLDM_CRC_INCOMPLETE_COMP_IMAGE_SET:
+	case PLDM_CCRC_COMP_INFO_NO_MATCH:
+	case PLDM_CCRC_COMP_VER_STR_IDENTICAL:
+	case PLDM_CCRC_COMP_VER_STR_LOWER:
+		return true;
+
+	default:
+		if (comp_compatibility_resp_code >=
+			PLDM_CCRC_VENDOR_COMP_RESP_CODE_RANGE_MIN &&
+		    comp_compatibility_resp_code <=
+			PLDM_CCRC_VENDOR_COMP_RESP_CODE_RANGE_MAX) {
+			return true;
+		}
+		return false;
+	}
+}
+
+/** @brief Check whether SelfContainedActivationRequest is valid
+ *
+ *  @return true if SelfContainedActivationRequest is valid, false if not
+ */
+static bool
+is_self_contained_activation_req_valid(bool8_t self_contained_activation_req)
+{
+	switch (self_contained_activation_req) {
+	case PLDM_NOT_ACTIVATE_SELF_CONTAINED_COMPONENTS:
+	case PLDM_ACTIVATE_SELF_CONTAINED_COMPONENTS:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/** @brief Check if current or previous status in GetStatus command response is
+ *         valid
+ *
+ *	@param[in] state - current or previous different state machine state of
+ *                     the FD
+ *	@return true if state is valid, false if not
+ */
+static bool is_state_valid(uint8_t state)
+{
+	switch (state) {
+	case PLDM_FD_STATE_IDLE:
+	case PLDM_FD_STATE_LEARN_COMPONENTS:
+	case PLDM_FD_STATE_READY_XFER:
+	case PLDM_FD_STATE_DOWNLOAD:
+	case PLDM_FD_STATE_VERIFY:
+	case PLDM_FD_STATE_APPLY:
+	case PLDM_FD_STATE_ACTIVATE:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/** @brief Check if aux state in GetStatus command response is valid
+ *
+ *  @param[in] aux_state - provides additional information to the UA to describe
+ *                         the current operation state of the FD/FDP
+ *
+ *	@return true if aux state is valid, false if not
+ */
+static bool is_aux_state_valid(uint8_t aux_state)
+{
+	switch (aux_state) {
+	case PLDM_FD_OPERATION_IN_PROGRESS:
+	case PLDM_FD_OPERATION_SUCCESSFUL:
+	case PLDM_FD_OPERATION_FAILED:
+	case PLDM_FD_IDLE_LEARN_COMPONENTS_READ_XFER:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+/** @brief Check if aux state status in GetStatus command response is valid
+ *
+ *	@param[in] aux_state_status - aux state status
+ *
+ *	@return true if aux state status is valid, false if not
+ */
+static bool is_aux_state_status_valid(uint8_t aux_state_status)
+{
+	if (aux_state_status == PLDM_FD_AUX_STATE_IN_PROGRESS_OR_SUCCESS ||
+	    aux_state_status == PLDM_FD_TIMEOUT ||
+	    aux_state_status == PLDM_FD_GENERIC_ERROR) {
+		return true;
+	} else if (aux_state_status >=
+		       PLDM_FD_VENDOR_DEFINED_STATUS_CODE_START &&
+		   aux_state_status <= PLDM_FD_VENDOR_DEFINED_STATUS_CODE_END) {
+		return true;
+	}
+
+	return false;
+}
+
+/** @brief Check if reason code in GetStatus command response is valid
+ *
+ *	@param[in] reason_code - provides the reason for why the current state
+ *                           entered the IDLE state
+ *
+ *	@return true if reason code is valid, false if not
+ */
+static bool is_reason_code_valid(uint8_t reason_code)
+{
+
+	switch (reason_code) {
+	case PLDM_FD_INITIALIZATION:
+	case PLDM_FD_ACTIVATE_FW:
+	case PLDM_FD_CANCEL_UPDATE:
+	case PLDM_FD_TIMEOUT_LEARN_COMPONENT:
+	case PLDM_FD_TIMEOUT_READY_XFER:
+	case PLDM_FD_TIMEOUT_DOWNLOAD:
+	case PLDM_FD_TIMEOUT_VERIFY:
+	case PLDM_FD_TIMEOUT_APPLY:
+		return true;
+
+	default:
+		if (reason_code >= PLDM_FD_STATUS_VENDOR_DEFINED_MIN) {
+			return true;
+		}
+		return false;
+	}
+}
+
+/** @brief Check if non functioning component indication in CancelUpdate
+ *         response is valid
+ *
+ *  @return true if non functioning component indication is valid, false if not
+ */
+static bool is_non_functioning_component_indication_valid(
+    bool8_t non_functioning_component_indication)
+{
+	switch (non_functioning_component_indication) {
+	case PLDM_FWUP_COMPONENTS_FUNCTIONING:
+	case PLDM_FWUP_COMPONENTS_NOT_FUNCTIONING:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+int decode_pldm_package_header_info(
+    const uint8_t *data, size_t length,
+    struct pldm_package_header_information *package_header_info,
+    struct variable_field *package_version_str)
+{
+	if (data == NULL || package_header_info == NULL ||
+	    package_version_str == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_package_header_information)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_package_header_information *data_header =
+	    (struct pldm_package_header_information *)(data);
+
+	if (!is_string_type_valid(data_header->package_version_string_type) ||
+	    (data_header->package_version_string_length == 0)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_package_header_information) +
+			 data_header->package_version_string_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if ((data_header->component_bitmap_bit_length %
+	     PLDM_FWUP_COMPONENT_BITMAP_MULTIPLE) != 0) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	memcpy(package_header_info->uuid, data_header->uuid,
+	       sizeof(data_header->uuid));
+	package_header_info->package_header_format_version =
+	    data_header->package_header_format_version;
+	package_header_info->package_header_size =
+	    le16toh(data_header->package_header_size);
+	memcpy(package_header_info->package_release_date_time,
+	       data_header->package_release_date_time,
+	       sizeof(data_header->package_release_date_time));
+	package_header_info->component_bitmap_bit_length =
+	    le16toh(data_header->component_bitmap_bit_length);
+	package_header_info->package_version_string_type =
+	    data_header->package_version_string_type;
+	package_header_info->package_version_string_length =
+	    data_header->package_version_string_length;
+	package_version_str->ptr =
+	    data + sizeof(struct pldm_package_header_information);
+	package_version_str->length =
+	    package_header_info->package_version_string_length;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_firmware_device_id_record(
+    const uint8_t *data, size_t length, uint16_t component_bitmap_bit_length,
+    struct pldm_firmware_device_id_record *fw_device_id_record,
+    struct variable_field *applicable_components,
+    struct variable_field *comp_image_set_version_str,
+    struct variable_field *record_descriptors,
+    struct variable_field *fw_device_pkg_data)
+{
+	if (data == NULL || fw_device_id_record == NULL ||
+	    applicable_components == NULL ||
+	    comp_image_set_version_str == NULL || record_descriptors == NULL ||
+	    fw_device_pkg_data == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_firmware_device_id_record)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if ((component_bitmap_bit_length %
+	     PLDM_FWUP_COMPONENT_BITMAP_MULTIPLE) != 0) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_firmware_device_id_record *data_record =
+	    (struct pldm_firmware_device_id_record *)(data);
+
+	if (!is_string_type_valid(
+		data_record->comp_image_set_version_string_type) ||
+	    (data_record->comp_image_set_version_string_length == 0)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	fw_device_id_record->record_length =
+	    le16toh(data_record->record_length);
+	fw_device_id_record->descriptor_count = data_record->descriptor_count;
+	fw_device_id_record->device_update_option_flags.value =
+	    le32toh(data_record->device_update_option_flags.value);
+	fw_device_id_record->comp_image_set_version_string_type =
+	    data_record->comp_image_set_version_string_type;
+	fw_device_id_record->comp_image_set_version_string_length =
+	    data_record->comp_image_set_version_string_length;
+	fw_device_id_record->fw_device_pkg_data_length =
+	    le16toh(data_record->fw_device_pkg_data_length);
+
+	if (length < fw_device_id_record->record_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	uint16_t applicable_components_length =
+	    component_bitmap_bit_length / PLDM_FWUP_COMPONENT_BITMAP_MULTIPLE;
+	uint16_t calc_min_record_length =
+	    sizeof(struct pldm_firmware_device_id_record) +
+	    applicable_components_length +
+	    data_record->comp_image_set_version_string_length +
+	    PLDM_FWUP_DEVICE_DESCRIPTOR_MIN_LEN +
+	    fw_device_id_record->fw_device_pkg_data_length;
+
+	if (fw_device_id_record->record_length < calc_min_record_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	applicable_components->ptr =
+	    data + sizeof(struct pldm_firmware_device_id_record);
+	applicable_components->length = applicable_components_length;
+
+	comp_image_set_version_str->ptr =
+	    applicable_components->ptr + applicable_components->length;
+	comp_image_set_version_str->length =
+	    fw_device_id_record->comp_image_set_version_string_length;
+
+	record_descriptors->ptr = comp_image_set_version_str->ptr +
+				  comp_image_set_version_str->length;
+	record_descriptors->length =
+	    fw_device_id_record->record_length -
+	    sizeof(struct pldm_firmware_device_id_record) -
+	    applicable_components_length -
+	    fw_device_id_record->comp_image_set_version_string_length -
+	    fw_device_id_record->fw_device_pkg_data_length;
+
+	if (fw_device_id_record->fw_device_pkg_data_length) {
+		fw_device_pkg_data->ptr =
+		    record_descriptors->ptr + record_descriptors->length;
+		fw_device_pkg_data->length =
+		    fw_device_id_record->fw_device_pkg_data_length;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int decode_descriptor_type_length_value(const uint8_t *data, size_t length,
+					uint16_t *descriptor_type,
+					struct variable_field *descriptor_data)
+{
+	uint16_t descriptor_length = 0;
+
+	if (data == NULL || descriptor_type == NULL ||
+	    descriptor_data == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < PLDM_FWUP_DEVICE_DESCRIPTOR_MIN_LEN) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_descriptor_tlv *entry =
+	    (struct pldm_descriptor_tlv *)(data);
+
+	*descriptor_type = le16toh(entry->descriptor_type);
+	descriptor_length = le16toh(entry->descriptor_length);
+	if (*descriptor_type != PLDM_FWUP_VENDOR_DEFINED) {
+		if (descriptor_length !=
+		    get_descriptor_type_length(*descriptor_type)) {
+			return PLDM_ERROR_INVALID_LENGTH;
+		}
+	}
+
+	if (length < (sizeof(*descriptor_type) + sizeof(descriptor_length) +
+		      descriptor_length)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	descriptor_data->ptr = entry->descriptor_data;
+	descriptor_data->length = descriptor_length;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_vendor_defined_descriptor_value(
+    const uint8_t *data, size_t length, uint8_t *descriptor_title_str_type,
+    struct variable_field *descriptor_title_str,
+    struct variable_field *descriptor_data)
+{
+	if (data == NULL || descriptor_title_str_type == NULL ||
+	    descriptor_title_str == NULL || descriptor_data == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_vendor_defined_descriptor_title_data)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_vendor_defined_descriptor_title_data *entry =
+	    (struct pldm_vendor_defined_descriptor_title_data *)(data);
+	if (!is_string_type_valid(
+		entry->vendor_defined_descriptor_title_str_type) ||
+	    (entry->vendor_defined_descriptor_title_str_len == 0)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	// Assuming atleast 1 byte of VendorDefinedDescriptorData
+	if (length < (sizeof(struct pldm_vendor_defined_descriptor_title_data) +
+		      entry->vendor_defined_descriptor_title_str_len)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	*descriptor_title_str_type =
+	    entry->vendor_defined_descriptor_title_str_type;
+	descriptor_title_str->ptr = entry->vendor_defined_descriptor_title_str;
+	descriptor_title_str->length =
+	    entry->vendor_defined_descriptor_title_str_len;
+
+	descriptor_data->ptr =
+	    descriptor_title_str->ptr + descriptor_title_str->length;
+	descriptor_data->length =
+	    length - sizeof(entry->vendor_defined_descriptor_title_str_type) -
+	    sizeof(entry->vendor_defined_descriptor_title_str_len) -
+	    descriptor_title_str->length;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_pldm_comp_image_info(
+    const uint8_t *data, size_t length,
+    struct pldm_component_image_information *pldm_comp_image_info,
+    struct variable_field *comp_version_str)
+{
+	if (data == NULL || pldm_comp_image_info == NULL ||
+	    comp_version_str == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_component_image_information)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_component_image_information *data_header =
+	    (struct pldm_component_image_information *)(data);
+
+	if (!is_string_type_valid(data_header->comp_version_string_type) ||
+	    (data_header->comp_version_string_length == 0)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_component_image_information) +
+			 data_header->comp_version_string_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	pldm_comp_image_info->comp_classification =
+	    le16toh(data_header->comp_classification);
+	pldm_comp_image_info->comp_identifier =
+	    le16toh(data_header->comp_identifier);
+	pldm_comp_image_info->comp_comparison_stamp =
+	    le32toh(data_header->comp_comparison_stamp);
+	pldm_comp_image_info->comp_options.value =
+	    le16toh(data_header->comp_options.value);
+	pldm_comp_image_info->requested_comp_activation_method.value =
+	    le16toh(data_header->requested_comp_activation_method.value);
+	pldm_comp_image_info->comp_location_offset =
+	    le32toh(data_header->comp_location_offset);
+	pldm_comp_image_info->comp_size = le32toh(data_header->comp_size);
+	pldm_comp_image_info->comp_version_string_type =
+	    data_header->comp_version_string_type;
+	pldm_comp_image_info->comp_version_string_length =
+	    data_header->comp_version_string_length;
+
+	if ((pldm_comp_image_info->comp_options.bits.bit1 == false &&
+	     pldm_comp_image_info->comp_comparison_stamp !=
+		 PLDM_FWUP_INVALID_COMPONENT_COMPARISON_TIMESTAMP)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (pldm_comp_image_info->comp_location_offset == 0 ||
+	    pldm_comp_image_info->comp_size == 0) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	comp_version_str->ptr =
+	    data + sizeof(struct pldm_component_image_information);
+	comp_version_str->length =
+	    pldm_comp_image_info->comp_version_string_length;
+
+	return PLDM_SUCCESS;
+}
+
+int encode_query_device_identifiers_req(uint8_t instance_id,
+					size_t payload_length,
+					struct pldm_msg *msg)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_QUERY_DEVICE_IDENTIFIERS_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	return encode_pldm_header_only(PLDM_REQUEST, instance_id, PLDM_FWUP,
+				       PLDM_QUERY_DEVICE_IDENTIFIERS, msg);
+}
+
+int decode_query_device_identifiers_resp(const struct pldm_msg *msg,
+					 size_t payload_length,
+					 uint8_t *completion_code,
+					 uint32_t *device_identifiers_len,
+					 uint8_t *descriptor_count,
+					 uint8_t **descriptor_data)
+{
+	if (msg == NULL || completion_code == NULL ||
+	    device_identifiers_len == NULL || descriptor_count == NULL ||
+	    descriptor_data == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (PLDM_SUCCESS != *completion_code) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length <
+	    sizeof(struct pldm_query_device_identifiers_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_query_device_identifiers_resp *response =
+	    (struct pldm_query_device_identifiers_resp *)msg->payload;
+	*device_identifiers_len = le32toh(response->device_identifiers_len);
+
+	if (*device_identifiers_len < PLDM_FWUP_DEVICE_DESCRIPTOR_MIN_LEN) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if (payload_length !=
+	    sizeof(struct pldm_query_device_identifiers_resp) +
+		*device_identifiers_len) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+	*descriptor_count = response->descriptor_count;
+
+	if (*descriptor_count == 0) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	*descriptor_data =
+	    (uint8_t *)(msg->payload +
+			sizeof(struct pldm_query_device_identifiers_resp));
+	return PLDM_SUCCESS;
+}
+
+int encode_get_firmware_parameters_req(uint8_t instance_id,
+				       size_t payload_length,
+				       struct pldm_msg *msg)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_GET_FIRMWARE_PARAMETERS_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	return encode_pldm_header_only(PLDM_REQUEST, instance_id, PLDM_FWUP,
+				       PLDM_GET_FIRMWARE_PARAMETERS, msg);
+}
+
+int decode_get_firmware_parameters_resp(
+    const struct pldm_msg *msg, size_t payload_length,
+    struct pldm_get_firmware_parameters_resp *resp_data,
+    struct variable_field *active_comp_image_set_ver_str,
+    struct variable_field *pending_comp_image_set_ver_str,
+    struct variable_field *comp_parameter_table)
+{
+	if (msg == NULL || resp_data == NULL ||
+	    active_comp_image_set_ver_str == NULL ||
+	    pending_comp_image_set_ver_str == NULL ||
+	    comp_parameter_table == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	resp_data->completion_code = msg->payload[0];
+	if (PLDM_SUCCESS != resp_data->completion_code) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length < sizeof(struct pldm_get_firmware_parameters_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_get_firmware_parameters_resp *response =
+	    (struct pldm_get_firmware_parameters_resp *)msg->payload;
+
+	if (!is_string_type_valid(
+		response->active_comp_image_set_ver_str_type) ||
+	    (response->active_comp_image_set_ver_str_len == 0)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (response->pending_comp_image_set_ver_str_len == 0) {
+		if (response->pending_comp_image_set_ver_str_type !=
+		    PLDM_STR_TYPE_UNKNOWN) {
+			return PLDM_ERROR_INVALID_DATA;
+		}
+	} else {
+		if (!is_string_type_valid(
+			response->pending_comp_image_set_ver_str_type)) {
+			return PLDM_ERROR_INVALID_DATA;
+		}
+	}
+
+	size_t partial_response_length =
+	    sizeof(struct pldm_get_firmware_parameters_resp) +
+	    response->active_comp_image_set_ver_str_len +
+	    response->pending_comp_image_set_ver_str_len;
+
+	if (payload_length < partial_response_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	resp_data->capabilities_during_update.value =
+	    le32toh(response->capabilities_during_update.value);
+	resp_data->comp_count = le16toh(response->comp_count);
+	resp_data->active_comp_image_set_ver_str_type =
+	    response->active_comp_image_set_ver_str_type;
+	resp_data->active_comp_image_set_ver_str_len =
+	    response->active_comp_image_set_ver_str_len;
+	resp_data->pending_comp_image_set_ver_str_type =
+	    response->pending_comp_image_set_ver_str_type;
+	resp_data->pending_comp_image_set_ver_str_len =
+	    response->pending_comp_image_set_ver_str_len;
+
+	active_comp_image_set_ver_str->ptr =
+	    msg->payload + sizeof(struct pldm_get_firmware_parameters_resp);
+	active_comp_image_set_ver_str->length =
+	    resp_data->active_comp_image_set_ver_str_len;
+
+	if (resp_data->pending_comp_image_set_ver_str_len != 0) {
+		pending_comp_image_set_ver_str->ptr =
+		    msg->payload +
+		    sizeof(struct pldm_get_firmware_parameters_resp) +
+		    resp_data->active_comp_image_set_ver_str_len;
+		pending_comp_image_set_ver_str->length =
+		    resp_data->pending_comp_image_set_ver_str_len;
+	} else {
+		pending_comp_image_set_ver_str->ptr = NULL;
+		pending_comp_image_set_ver_str->length = 0;
+	}
+
+	if (payload_length > partial_response_length && resp_data->comp_count) {
+		comp_parameter_table->ptr =
+		    msg->payload +
+		    sizeof(struct pldm_get_firmware_parameters_resp) +
+		    resp_data->active_comp_image_set_ver_str_len +
+		    resp_data->pending_comp_image_set_ver_str_len;
+		comp_parameter_table->length =
+		    payload_length - partial_response_length;
+	} else {
+		comp_parameter_table->ptr = NULL;
+		comp_parameter_table->length = 0;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int decode_get_firmware_parameters_resp_comp_entry(
+    const uint8_t *data, size_t length,
+    struct pldm_component_parameter_entry *component_data,
+    struct variable_field *active_comp_ver_str,
+    struct variable_field *pending_comp_ver_str)
+{
+	if (data == NULL || component_data == NULL ||
+	    active_comp_ver_str == NULL || pending_comp_ver_str == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (length < sizeof(struct pldm_component_parameter_entry)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_component_parameter_entry *entry =
+	    (struct pldm_component_parameter_entry *)(data);
+
+	size_t entry_length = sizeof(struct pldm_component_parameter_entry) +
+			      entry->active_comp_ver_str_len +
+			      entry->pending_comp_ver_str_len;
+
+	if (length < entry_length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	component_data->comp_classification =
+	    le16toh(entry->comp_classification);
+	component_data->comp_identifier = le16toh(entry->comp_identifier);
+	component_data->comp_classification_index =
+	    entry->comp_classification_index;
+	component_data->active_comp_comparison_stamp =
+	    le32toh(entry->active_comp_comparison_stamp);
+	component_data->active_comp_ver_str_type =
+	    entry->active_comp_ver_str_type;
+	component_data->active_comp_ver_str_len =
+	    entry->active_comp_ver_str_len;
+	memcpy(component_data->active_comp_release_date,
+	       entry->active_comp_release_date,
+	       sizeof(entry->active_comp_release_date));
+	component_data->pending_comp_comparison_stamp =
+	    le32toh(entry->pending_comp_comparison_stamp);
+	component_data->pending_comp_ver_str_type =
+	    entry->pending_comp_ver_str_type;
+	component_data->pending_comp_ver_str_len =
+	    entry->pending_comp_ver_str_len;
+	memcpy(component_data->pending_comp_release_date,
+	       entry->pending_comp_release_date,
+	       sizeof(entry->pending_comp_release_date));
+	component_data->comp_activation_methods.value =
+	    le16toh(entry->comp_activation_methods.value);
+	component_data->capabilities_during_update.value =
+	    le32toh(entry->capabilities_during_update.value);
+
+	if (entry->active_comp_ver_str_len != 0) {
+		active_comp_ver_str->ptr =
+		    data + sizeof(struct pldm_component_parameter_entry);
+		active_comp_ver_str->length = entry->active_comp_ver_str_len;
+	} else {
+		active_comp_ver_str->ptr = NULL;
+		active_comp_ver_str->length = 0;
+	}
+
+	if (entry->pending_comp_ver_str_len != 0) {
+
+		pending_comp_ver_str->ptr =
+		    data + sizeof(struct pldm_component_parameter_entry) +
+		    entry->active_comp_ver_str_len;
+		pending_comp_ver_str->length = entry->pending_comp_ver_str_len;
+	} else {
+		pending_comp_ver_str->ptr = NULL;
+		pending_comp_ver_str->length = 0;
+	}
+	return PLDM_SUCCESS;
+}
+
+int encode_request_update_req(uint8_t instance_id, uint32_t max_transfer_size,
+			      uint16_t num_of_comp,
+			      uint8_t max_outstanding_transfer_req,
+			      uint16_t pkg_data_len,
+			      uint8_t comp_image_set_ver_str_type,
+			      uint8_t comp_image_set_ver_str_len,
+			      const struct variable_field *comp_img_set_ver_str,
+			      struct pldm_msg *msg, size_t payload_length)
+{
+	if (comp_img_set_ver_str == NULL || comp_img_set_ver_str->ptr == NULL ||
+	    msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(struct pldm_request_update_req) +
+				  comp_img_set_ver_str->length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if ((comp_image_set_ver_str_len == 0) ||
+	    (comp_image_set_ver_str_len != comp_img_set_ver_str->length)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if ((max_transfer_size < PLDM_FWUP_BASELINE_TRANSFER_SIZE) ||
+	    (max_outstanding_transfer_req < PLDM_FWUP_MIN_OUTSTANDING_REQ)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (!is_string_type_valid(comp_image_set_ver_str_type)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_REQUEST_UPDATE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	struct pldm_request_update_req *request =
+	    (struct pldm_request_update_req *)msg->payload;
+
+	request->max_transfer_size = htole32(max_transfer_size);
+	request->num_of_comp = htole16(num_of_comp);
+	request->max_outstanding_transfer_req = max_outstanding_transfer_req;
+	request->pkg_data_len = htole16(pkg_data_len);
+	request->comp_image_set_ver_str_type = comp_image_set_ver_str_type;
+	request->comp_image_set_ver_str_len = comp_image_set_ver_str_len;
+
+	memcpy(msg->payload + sizeof(struct pldm_request_update_req),
+	       comp_img_set_ver_str->ptr, comp_img_set_ver_str->length);
+
+	return PLDM_SUCCESS;
+}
+
+int decode_request_update_resp(const struct pldm_msg *msg,
+			       size_t payload_length, uint8_t *completion_code,
+			       uint16_t *fd_meta_data_len,
+			       uint8_t *fd_will_send_pkg_data)
+{
+	if (msg == NULL || completion_code == NULL ||
+	    fd_meta_data_len == NULL || fd_will_send_pkg_data == NULL ||
+	    !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_request_update_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_request_update_resp *response =
+	    (struct pldm_request_update_resp *)msg->payload;
+
+	*fd_meta_data_len = le16toh(response->fd_meta_data_len);
+	*fd_will_send_pkg_data = response->fd_will_send_pkg_data;
+
+	return PLDM_SUCCESS;
+}
+
+int encode_pass_component_table_req(
+    uint8_t instance_id, uint8_t transfer_flag, uint16_t comp_classification,
+    uint16_t comp_identifier, uint8_t comp_classification_index,
+    uint32_t comp_comparison_stamp, uint8_t comp_ver_str_type,
+    uint8_t comp_ver_str_len, const struct variable_field *comp_ver_str,
+    struct pldm_msg *msg, size_t payload_length)
+{
+	if (comp_ver_str == NULL || comp_ver_str->ptr == NULL || msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(struct pldm_pass_component_table_req) +
+				  comp_ver_str->length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if ((comp_ver_str_len == 0) ||
+	    (comp_ver_str_len != comp_ver_str->length)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (!is_transfer_flag_valid(transfer_flag)) {
+		return PLDM_INVALID_TRANSFER_OPERATION_FLAG;
+	}
+
+	if (!is_string_type_valid(comp_ver_str_type)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_PASS_COMPONENT_TABLE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	struct pldm_pass_component_table_req *request =
+	    (struct pldm_pass_component_table_req *)msg->payload;
+
+	request->transfer_flag = transfer_flag;
+	request->comp_classification = htole16(comp_classification);
+	request->comp_identifier = htole16(comp_identifier);
+	request->comp_classification_index = comp_classification_index;
+	request->comp_comparison_stamp = htole32(comp_comparison_stamp);
+	request->comp_ver_str_type = comp_ver_str_type;
+	request->comp_ver_str_len = comp_ver_str_len;
+
+	memcpy(msg->payload + sizeof(struct pldm_pass_component_table_req),
+	       comp_ver_str->ptr, comp_ver_str->length);
+
+	return PLDM_SUCCESS;
+}
+
+int decode_pass_component_table_resp(const struct pldm_msg *msg,
+				     const size_t payload_length,
+				     uint8_t *completion_code,
+				     uint8_t *comp_resp,
+				     uint8_t *comp_resp_code)
+{
+	if (msg == NULL || completion_code == NULL || comp_resp == NULL ||
+	    comp_resp_code == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_pass_component_table_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_pass_component_table_resp *response =
+	    (struct pldm_pass_component_table_resp *)msg->payload;
+
+	if (!is_comp_resp_valid(response->comp_resp)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (!is_comp_resp_code_valid(response->comp_resp_code)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*comp_resp = response->comp_resp;
+	*comp_resp_code = response->comp_resp_code;
+
+	return PLDM_SUCCESS;
+}
+
+int encode_update_component_req(
+    uint8_t instance_id, uint16_t comp_classification, uint16_t comp_identifier,
+    uint8_t comp_classification_index, uint32_t comp_comparison_stamp,
+    uint32_t comp_image_size, bitfield32_t update_option_flags,
+    uint8_t comp_ver_str_type, uint8_t comp_ver_str_len,
+    const struct variable_field *comp_ver_str, struct pldm_msg *msg,
+    size_t payload_length)
+{
+	if (comp_ver_str == NULL || comp_ver_str->ptr == NULL || msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length !=
+	    sizeof(struct pldm_update_component_req) + comp_ver_str->length) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if (!comp_image_size) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if ((comp_ver_str_len == 0) ||
+	    (comp_ver_str_len != comp_ver_str->length)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (!is_string_type_valid(comp_ver_str_type)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_UPDATE_COMPONENT;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	struct pldm_update_component_req *request =
+	    (struct pldm_update_component_req *)msg->payload;
+
+	request->comp_classification = htole16(comp_classification);
+	request->comp_identifier = htole16(comp_identifier);
+	request->comp_classification_index = comp_classification_index;
+	request->comp_comparison_stamp = htole32(comp_comparison_stamp);
+	request->comp_image_size = htole32(comp_image_size);
+	request->update_option_flags.value = htole32(update_option_flags.value);
+	request->comp_ver_str_type = comp_ver_str_type;
+	request->comp_ver_str_len = comp_ver_str_len;
+
+	memcpy(msg->payload + sizeof(struct pldm_update_component_req),
+	       comp_ver_str->ptr, comp_ver_str->length);
+
+	return PLDM_SUCCESS;
+}
+
+int decode_update_component_resp(const struct pldm_msg *msg,
+				 size_t payload_length,
+				 uint8_t *completion_code,
+				 uint8_t *comp_compatibility_resp,
+				 uint8_t *comp_compatibility_resp_code,
+				 bitfield32_t *update_option_flags_enabled,
+				 uint16_t *time_before_req_fw_data)
+{
+	if (msg == NULL || completion_code == NULL ||
+	    comp_compatibility_resp == NULL ||
+	    comp_compatibility_resp_code == NULL ||
+	    update_option_flags_enabled == NULL ||
+	    time_before_req_fw_data == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_update_component_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_update_component_resp *response =
+	    (struct pldm_update_component_resp *)msg->payload;
+
+	if (!is_comp_compatibility_resp_valid(
+		response->comp_compatibility_resp)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (!is_comp_compatibility_resp_code_valid(
+		response->comp_compatibility_resp_code)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*comp_compatibility_resp = response->comp_compatibility_resp;
+	*comp_compatibility_resp_code = response->comp_compatibility_resp_code;
+	update_option_flags_enabled->value =
+	    le32toh(response->update_option_flags_enabled.value);
+	*time_before_req_fw_data = le16toh(response->time_before_req_fw_data);
+
+	return PLDM_SUCCESS;
+}
+
+int decode_request_firmware_data_req(const struct pldm_msg *msg,
+				     size_t payload_length, uint32_t *offset,
+				     uint32_t *length)
+{
+	if (msg == NULL || offset == NULL || length == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (payload_length != sizeof(struct pldm_request_firmware_data_req)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+	struct pldm_request_firmware_data_req *request =
+	    (struct pldm_request_firmware_data_req *)msg->payload;
+	*offset = le32toh(request->offset);
+	*length = le32toh(request->length);
+
+	if (*length < PLDM_FWUP_BASELINE_TRANSFER_SIZE) {
+		return PLDM_FWUP_INVALID_TRANSFER_LENGTH;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int encode_request_firmware_data_resp(uint8_t instance_id,
+				      uint8_t completion_code,
+				      struct pldm_msg *msg,
+				      size_t payload_length)
+{
+	if (msg == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_RESPONSE;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_REQUEST_FIRMWARE_DATA;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	msg->payload[0] = completion_code;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_transfer_complete_req(const struct pldm_msg *msg,
+				 size_t payload_length,
+				 uint8_t *transfer_result)
+{
+	if (msg == NULL || transfer_result == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(*transfer_result)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	*transfer_result = msg->payload[0];
+	return PLDM_SUCCESS;
+}
+
+int encode_transfer_complete_resp(uint8_t instance_id, uint8_t completion_code,
+				  struct pldm_msg *msg, size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(completion_code)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_RESPONSE;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_TRANSFER_COMPLETE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	msg->payload[0] = completion_code;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_verify_complete_req(const struct pldm_msg *msg,
+			       size_t payload_length, uint8_t *verify_result)
+{
+	if (msg == NULL || verify_result == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(*verify_result)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	*verify_result = msg->payload[0];
+	return PLDM_SUCCESS;
+}
+
+int encode_verify_complete_resp(uint8_t instance_id, uint8_t completion_code,
+				struct pldm_msg *msg, size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(completion_code)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_RESPONSE;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_VERIFY_COMPLETE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	msg->payload[0] = completion_code;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_apply_complete_req(
+    const struct pldm_msg *msg, size_t payload_length, uint8_t *apply_result,
+    bitfield16_t *comp_activation_methods_modification)
+{
+	if (msg == NULL || apply_result == NULL ||
+	    comp_activation_methods_modification == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(struct pldm_apply_complete_req)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_apply_complete_req *request =
+	    (struct pldm_apply_complete_req *)msg->payload;
+
+	*apply_result = request->apply_result;
+	comp_activation_methods_modification->value =
+	    le16toh(request->comp_activation_methods_modification.value);
+
+	if ((*apply_result != PLDM_FWUP_APPLY_SUCCESS_WITH_ACTIVATION_METHOD) &&
+	    comp_activation_methods_modification->value) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int encode_apply_complete_resp(uint8_t instance_id, uint8_t completion_code,
+			       struct pldm_msg *msg, size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(completion_code)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_RESPONSE;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_APPLY_COMPLETE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	msg->payload[0] = completion_code;
+
+	return PLDM_SUCCESS;
+}
+
+int encode_activate_firmware_req(uint8_t instance_id,
+				 bool8_t self_contained_activation_req,
+				 struct pldm_msg *msg, size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(struct pldm_activate_firmware_req)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	if (!is_self_contained_activation_req_valid(
+		self_contained_activation_req)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_ACTIVATE_FIRMWARE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	struct pldm_activate_firmware_req *request =
+	    (struct pldm_activate_firmware_req *)msg->payload;
+
+	request->self_contained_activation_req = self_contained_activation_req;
+
+	return PLDM_SUCCESS;
+}
+
+int decode_activate_firmware_resp(const struct pldm_msg *msg,
+				  size_t payload_length,
+				  uint8_t *completion_code,
+				  uint16_t *estimated_time_activation)
+{
+	if (msg == NULL || completion_code == NULL ||
+	    estimated_time_activation == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_activate_firmware_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_activate_firmware_resp *response =
+	    (struct pldm_activate_firmware_resp *)msg->payload;
+
+	*estimated_time_activation =
+	    le16toh(response->estimated_time_activation);
+
+	return PLDM_SUCCESS;
+}
+
+int encode_get_status_req(uint8_t instance_id, struct pldm_msg *msg,
+			  size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_GET_STATUS_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_GET_STATUS;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int decode_get_status_resp(const struct pldm_msg *msg, size_t payload_length,
+			   uint8_t *completion_code, uint8_t *current_state,
+			   uint8_t *previous_state, uint8_t *aux_state,
+			   uint8_t *aux_state_status, uint8_t *progress_percent,
+			   uint8_t *reason_code,
+			   bitfield32_t *update_option_flags_enabled)
+{
+	if (msg == NULL || completion_code == NULL || current_state == NULL ||
+	    previous_state == NULL || aux_state == NULL ||
+	    aux_state_status == NULL || progress_percent == NULL ||
+	    reason_code == NULL || update_option_flags_enabled == NULL ||
+	    !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_get_status_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+	struct pldm_get_status_resp *response =
+	    (struct pldm_get_status_resp *)msg->payload;
+
+	if (!is_state_valid(response->current_state)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (!is_state_valid(response->previous_state)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (!is_aux_state_valid(response->aux_state)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (!is_aux_state_status_valid(response->aux_state_status)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (response->progress_percent > PLDM_FWUP_MAX_PROGRESS_PERCENT) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+	if (!is_reason_code_valid(response->reason_code)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if ((response->current_state == PLDM_FD_STATE_IDLE) ||
+	    (response->current_state == PLDM_FD_STATE_LEARN_COMPONENTS) ||
+	    (response->current_state == PLDM_FD_STATE_READY_XFER)) {
+		if (response->aux_state !=
+		    PLDM_FD_IDLE_LEARN_COMPONENTS_READ_XFER) {
+			return PLDM_ERROR_INVALID_DATA;
+		}
+	}
+
+	*current_state = response->current_state;
+	*previous_state = response->previous_state;
+	*aux_state = response->aux_state;
+	*aux_state_status = response->aux_state_status;
+	*progress_percent = response->progress_percent;
+	*reason_code = response->reason_code;
+	update_option_flags_enabled->value =
+	    le32toh(response->update_option_flags_enabled.value);
+
+	return PLDM_SUCCESS;
+}
+
+int encode_cancel_update_component_req(uint8_t instance_id,
+				       struct pldm_msg *msg,
+				       size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_CANCEL_UPDATE_COMPONENT_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_CANCEL_UPDATE_COMPONENT;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int decode_cancel_update_component_resp(const struct pldm_msg *msg,
+					size_t payload_length,
+					uint8_t *completion_code)
+{
+	if (msg == NULL || completion_code == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != sizeof(*completion_code)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	*completion_code = msg->payload[0];
+	return PLDM_SUCCESS;
+}
+
+int encode_cancel_update_req(uint8_t instance_id, struct pldm_msg *msg,
+			     size_t payload_length)
+{
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	if (payload_length != PLDM_CANCEL_UPDATE_REQ_BYTES) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+
+	struct pldm_header_info header = {0};
+	header.instance = instance_id;
+	header.msg_type = PLDM_REQUEST;
+	header.pldm_type = PLDM_FWUP;
+	header.command = PLDM_CANCEL_UPDATE;
+	uint8_t rc = pack_pldm_header(&header, &(msg->hdr));
+	if (rc) {
+		return rc;
+	}
+
+	return PLDM_SUCCESS;
+}
+
+int decode_cancel_update_resp(const struct pldm_msg *msg, size_t payload_length,
+			      uint8_t *completion_code,
+			      bool8_t *non_functioning_component_indication,
+			      bitfield64_t *non_functioning_component_bitmap)
+{
+	if (msg == NULL || completion_code == NULL ||
+	    non_functioning_component_indication == NULL ||
+	    non_functioning_component_bitmap == NULL || !payload_length) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (*completion_code != PLDM_SUCCESS) {
+		return PLDM_SUCCESS;
+	}
+
+	if (payload_length != sizeof(struct pldm_cancel_update_resp)) {
+		return PLDM_ERROR_INVALID_LENGTH;
+	}
+	struct pldm_cancel_update_resp *response =
+	    (struct pldm_cancel_update_resp *)msg->payload;
+
+	if (!is_non_functioning_component_indication_valid(
+		response->non_functioning_component_indication)) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*non_functioning_component_indication =
+	    response->non_functioning_component_indication;
+
+	if (*non_functioning_component_indication) {
+		non_functioning_component_bitmap->value =
+		    le64toh(response->non_functioning_component_bitmap);
+	}
+
+	return PLDM_SUCCESS;
+}