/** * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA * * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * 2. Redistributions in binary form, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other * materials provided with the distribution. * * 3. Neither the name of Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include #include "nrf_dfu_types.h" #include "nrf_dfu_settings.h" #include "nrf_dfu_utils.h" #include "nrf_dfu_flash.h" #include "nrf_bootloader_info.h" #include "pb.h" #include "pb_common.h" #include "pb_decode.h" #include "dfu-cc.pb.h" #include "crc32.h" #include "nrf_crypto.h" #include "nrf_crypto_shared.h" #include "nrf_assert.h" #include "nrf_dfu_validation.h" #include "nrf_dfu_ver_validation.h" #define NRF_LOG_MODULE_NAME nrf_dfu_validation #include "nrf_log.h" #include "nrf_log_ctrl.h" NRF_LOG_MODULE_REGISTER(); #ifndef DFU_REQUIRES_SOFTDEVICE #ifndef BLE_STACK_SUPPORT_REQD #define DFU_REQUIRES_SOFTDEVICE 0 #else #define DFU_REQUIRES_SOFTDEVICE 1 #endif #endif #define EXT_ERR(err) (nrf_dfu_result_t)((uint32_t)NRF_DFU_RES_CODE_EXT_ERROR + (uint32_t)err) /* Whether a complete init command has been received and prevalidated, but the firmware * is not yet fully transferred. This value will also be correct after reset. */ static bool m_valid_init_cmd_present = false; static dfu_packet_t m_packet = DFU_PACKET_INIT_DEFAULT; static uint8_t* m_init_packet_data_ptr = 0; static uint32_t m_init_packet_data_len = 0; static pb_istream_t m_pb_stream; static nrf_crypto_ecdsa_verify_context_t m_verify_context = {0}; static nrf_crypto_hash_context_t m_hash_context = {0}; __ALIGN(4) extern const uint8_t pk[64]; /** @brief Value length structure holding the public key. * * @details The pk value pointed to is the public key present in dfu_public_key.c */ static nrf_crypto_ecc_public_key_t m_public_key; /** @brief Structure to hold a signature */ static nrf_crypto_ecdsa_secp256r1_signature_t m_signature; /** @brief Structure to hold the hash for the init packet */ static nrf_crypto_hash_sha256_digest_t m_init_packet_hash; /** @brief Structure to hold the hash for the firmware image */ static nrf_crypto_hash_sha256_digest_t m_fw_hash; static void pb_decoding_callback(pb_istream_t *str, uint32_t tag, pb_wire_type_t wire_type, void *iter) { pb_field_iter_t* p_iter = (pb_field_iter_t *) iter; // Match the beginning of the init command. if (p_iter->pos->ptr == &dfu_init_command_fields[0]) { uint8_t * ptr = (uint8_t *)str->state; uint32_t size = str->bytes_left; // Remove tag byte. ptr++; size--; // Store the info in init_packet_data. m_init_packet_data_ptr = ptr; m_init_packet_data_len = size; NRF_LOG_DEBUG("PB: Init packet data len: %d", size); } } /** @brief Function for decoding byte stream into variable. * * @retval true If the stored init command was successfully decoded. * @retval false If there was no stored init command, or the decoding failed. */ static bool stored_init_cmd_decode(void) { m_pb_stream = pb_istream_from_buffer(s_dfu_settings.init_command, s_dfu_settings.progress.command_size); // Attach our callback to follow the field decoding. m_pb_stream.decoding_callback = pb_decoding_callback; m_init_packet_data_ptr = NULL; m_init_packet_data_len = 0; if (!pb_decode(&m_pb_stream, dfu_packet_fields, &m_packet)) { NRF_LOG_ERROR("Handler: Invalid protocol buffer m_pb_stream"); return false; } return true; } void nrf_dfu_validation_init(void) { ret_code_t err_code; uint8_t pk_copy[sizeof(pk)]; // If the command is stored to flash, init command was valid. if ( (s_dfu_settings.progress.command_size != 0) && stored_init_cmd_decode() && (s_dfu_settings.bank_1.image_size != 0)) { m_valid_init_cmd_present = true; } else { m_valid_init_cmd_present = false; } err_code = nrf_crypto_init(); ASSERT(err_code == NRF_SUCCESS); UNUSED_PARAMETER(err_code); // Convert public key to big-endian format for use in nrf_crypto. nrf_crypto_internal_double_swap_endian(pk_copy, pk, sizeof(pk) / 2); err_code = nrf_crypto_ecc_public_key_from_raw(&g_nrf_crypto_ecc_secp256r1_curve_info, &m_public_key, pk_copy, sizeof(pk)); ASSERT(err_code == NRF_SUCCESS); UNUSED_PARAMETER(err_code); } nrf_dfu_result_t nrf_dfu_validation_init_cmd_create(uint32_t size) { nrf_dfu_result_t ret_val = NRF_DFU_RES_CODE_SUCCESS; if (size == 0) { ret_val = NRF_DFU_RES_CODE_INVALID_PARAMETER; } else if (size > INIT_COMMAND_MAX_SIZE) { ret_val = NRF_DFU_RES_CODE_INSUFFICIENT_RESOURCES; } else { // Set DFU to uninitialized. m_valid_init_cmd_present = false; // Reset all progress. s_dfu_settings.write_offset = 0; memset(&s_dfu_settings.progress, 0x00, sizeof(dfu_progress_t)); // Set the init command size. s_dfu_settings.progress.command_size = size; } return ret_val; } nrf_dfu_result_t nrf_dfu_validation_init_cmd_append(uint8_t const * p_data, uint32_t length) { nrf_dfu_result_t ret_val = NRF_DFU_RES_CODE_SUCCESS; if ((length + s_dfu_settings.progress.command_offset) > s_dfu_settings.progress.command_size) { NRF_LOG_ERROR("Init command larger than expected."); ret_val = NRF_DFU_RES_CODE_INVALID_PARAMETER; } else { // Copy the received data to RAM, update offset and calculate CRC. memcpy(&s_dfu_settings.init_command[s_dfu_settings.progress.command_offset], p_data, length); s_dfu_settings.progress.command_offset += length; s_dfu_settings.progress.command_crc = crc32_compute(p_data, length, &s_dfu_settings.progress.command_crc); } return ret_val; } void nrf_dfu_validation_init_cmd_status_get(uint32_t * p_offset, uint32_t * p_crc, uint32_t * p_max_size) { *p_offset = s_dfu_settings.progress.command_offset; *p_crc = s_dfu_settings.progress.command_crc; *p_max_size = INIT_COMMAND_MAX_SIZE; } bool nrf_dfu_validation_init_cmd_present(void) { return m_valid_init_cmd_present; } // Function determines if init command signature is obligatory. static bool signature_required(dfu_fw_type_t fw_type_to_be_updated) { bool result = true; if ((!DFU_REQUIRES_SOFTDEVICE && (fw_type_to_be_updated == DFU_FW_TYPE_SOFTDEVICE)) || (fw_type_to_be_updated == DFU_FW_TYPE_APPLICATION)) { result = NRF_DFU_REQUIRE_SIGNED_APP_UPDATE; } return result; } // Function to perform signature check if required. static nrf_dfu_result_t signature_check(dfu_fw_type_t fw_type, dfu_signature_type_t signature_type, dfu_signed_command_signature_t const * p_signature) { ret_code_t err_code; size_t hash_len = NRF_CRYPTO_HASH_SIZE_SHA256; if (!signature_required(fw_type)) { return NRF_DFU_RES_CODE_SUCCESS; } NRF_LOG_INFO("Signature required. Checking signature.") if (p_signature == NULL) { NRF_LOG_WARNING("No signature found."); return EXT_ERR(NRF_DFU_EXT_ERROR_SIGNATURE_MISSING); } if (signature_type != DFU_SIGNATURE_TYPE_ECDSA_P256_SHA256) { NRF_LOG_INFO("Invalid signature type"); return EXT_ERR(NRF_DFU_EXT_ERROR_WRONG_SIGNATURE_TYPE); } NRF_LOG_INFO("Calculating init packet hash (init packet len: %d)", m_init_packet_data_len); err_code = nrf_crypto_hash_calculate(&m_hash_context, &g_nrf_crypto_hash_sha256_info, m_init_packet_data_ptr, m_init_packet_data_len, m_init_packet_hash, &hash_len); if (err_code != NRF_SUCCESS) { return NRF_DFU_RES_CODE_OPERATION_FAILED; } if (sizeof(m_signature) != p_signature->size) { return NRF_DFU_RES_CODE_OPERATION_FAILED; } // Prepare the signature received over the air. memcpy(m_signature, p_signature->bytes, p_signature->size); // Calculate the signature. NRF_LOG_INFO("Verify signature"); // The signature is in little-endian format. Change it to big-endian format for nrf_crypto use. nrf_crypto_internal_double_swap_endian_in_place(m_signature, sizeof(m_signature) / 2); err_code = nrf_crypto_ecdsa_verify(&m_verify_context, &m_public_key, m_init_packet_hash, hash_len, m_signature, sizeof(m_signature)); if (err_code != NRF_SUCCESS) { NRF_LOG_ERROR("Signature failed (err_code: 0x%x)", err_code); NRF_LOG_DEBUG("Signature:"); NRF_LOG_HEXDUMP_DEBUG(m_signature, sizeof(m_signature)); NRF_LOG_DEBUG("Hash:"); NRF_LOG_HEXDUMP_DEBUG(m_init_packet_hash, hash_len); NRF_LOG_DEBUG("Public Key:"); NRF_LOG_HEXDUMP_DEBUG(pk, sizeof(pk)); NRF_LOG_FLUSH(); return NRF_DFU_RES_CODE_INVALID_OBJECT; } NRF_LOG_INFO("Image verified"); return NRF_DFU_RES_CODE_SUCCESS; } // Function to calculate the total size of the firmware(s) in the update. static nrf_dfu_result_t update_data_size_get(dfu_init_command_t const * p_init, uint32_t * p_size) { nrf_dfu_result_t ret_val = EXT_ERR(NRF_DFU_EXT_ERROR_INIT_COMMAND_INVALID); uint32_t fw_sz = 0; if ((p_init->type == DFU_FW_TYPE_APPLICATION) && (p_init->has_app_size == true)) { fw_sz = p_init->app_size; } else { if ((p_init->type & DFU_FW_TYPE_SOFTDEVICE) && (p_init->has_sd_size == true)) { fw_sz = p_init->sd_size; } if ((p_init->type & DFU_FW_TYPE_BOOTLOADER) && (p_init->has_bl_size == true)) { if (p_init->bl_size <= BOOTLOADER_SIZE) { fw_sz += p_init->bl_size; } else { NRF_LOG_ERROR("BL size (%d) over limit (%d)", p_init->bl_size, BOOTLOADER_SIZE); fw_sz = 0; ret_val = NRF_DFU_RES_CODE_INSUFFICIENT_RESOURCES; } } } if (fw_sz) { *p_size = fw_sz; ret_val = NRF_DFU_RES_CODE_SUCCESS; } else { NRF_LOG_ERROR("Init packet does not contain valid firmware size"); } return ret_val; } /** * @brief Function to check if single bank update should be used. * * @param new_fw_type Firmware type. */ static bool use_single_bank(dfu_fw_type_t new_fw_type) { bool result = false; if (((new_fw_type == DFU_FW_TYPE_APPLICATION) || (new_fw_type == DFU_FW_TYPE_SOFTDEVICE)) && NRF_DFU_SINGLE_BANK_APP_UPDATES) { result = true; } return result; } // Function to determine whether the new firmware needs a SoftDevice to be present. static bool update_requires_softdevice(dfu_init_command_t const * p_init) { return ((p_init->sd_req_count > 0) && (p_init->sd_req[0] != SD_REQ_APP_OVERWRITES_SD)); } // Function to determine whether the SoftDevice can be removed during the update or not. static bool keep_softdevice(dfu_init_command_t const * p_init) { UNUSED_PARAMETER(p_init); // It's unused when DFU_REQUIRES_SOFTDEVICE is true. return DFU_REQUIRES_SOFTDEVICE || update_requires_softdevice(p_init); } /**@brief Function to determine where to temporarily store the incoming firmware. * This also checks whether the update will fit, and deletes existing * firmware to make room for the new firmware. * * @param[in] p_init Init command. * @param[in] fw_size The size of the incoming firmware. * @param[out] p_addr The address at which to initially store the firmware. * * @retval NRF_DFU_RES_CODE_SUCCESS If the size check passed and * an address was found. * @retval NRF_DFU_RES_CODE_INSUFFICIENT_RESOURCES If the size check failed. */ static nrf_dfu_result_t update_data_addr_get(dfu_init_command_t const * p_init, uint32_t fw_size, uint32_t * p_addr) { nrf_dfu_result_t ret_val = NRF_DFU_RES_CODE_SUCCESS; ret_code_t err_code = nrf_dfu_cache_prepare(fw_size, use_single_bank(p_init->type), NRF_DFU_FORCE_DUAL_BANK_APP_UPDATES, keep_softdevice(p_init)); if (err_code != NRF_SUCCESS) { NRF_LOG_ERROR("Can't find room for update"); ret_val = NRF_DFU_RES_CODE_INSUFFICIENT_RESOURCES; } else { *p_addr = nrf_dfu_bank1_start_addr(); NRF_LOG_DEBUG("Write address set to 0x%08x", *p_addr); } return ret_val; } nrf_dfu_result_t nrf_dfu_validation_init_cmd_execute(uint32_t * p_dst_data_addr, uint32_t * p_data_len) { nrf_dfu_result_t ret_val = NRF_DFU_RES_CODE_SUCCESS; if (s_dfu_settings.progress.command_offset != s_dfu_settings.progress.command_size) { // The object wasn't the right (requested) size. NRF_LOG_ERROR("Execute with faulty offset"); ret_val = NRF_DFU_RES_CODE_OPERATION_NOT_PERMITTED; } else if (m_valid_init_cmd_present) { *p_dst_data_addr = nrf_dfu_bank1_start_addr(); *p_data_len = s_dfu_settings.bank_1.image_size; ret_val = NRF_DFU_RES_CODE_SUCCESS; } else if (stored_init_cmd_decode() && (m_packet.has_signed_command || m_packet.has_command)) { dfu_command_t const * p_command = &m_packet.command; dfu_signature_type_t signature_type = (dfu_signature_type_t) 0; // Placeholder. dfu_signed_command_signature_t * p_signature = NULL; *p_dst_data_addr = 0; *p_data_len = 0; if (m_packet.has_signed_command) { p_command = &m_packet.signed_command.command; signature_type = m_packet.signed_command.signature_type; p_signature = &m_packet.signed_command.signature; } // Validate signature. ret_val = signature_check(p_command->init.type, signature_type, p_signature); // Validate versions. if (ret_val == NRF_DFU_RES_CODE_SUCCESS) { ret_val = nrf_dfu_ver_validation_check(&p_command->init); if (ret_val == NRF_DFU_RES_CODE_SUCCESS) { m_valid_init_cmd_present = true; } } // Get size of binary. if (ret_val == NRF_DFU_RES_CODE_SUCCESS) { ret_val = update_data_size_get(&p_command->init, p_data_len); } //Get address where to flash the binary. if (ret_val == NRF_DFU_RES_CODE_SUCCESS) { ret_val = update_data_addr_get(&p_command->init, *p_data_len, p_dst_data_addr); } } else { NRF_LOG_ERROR("Failed to decode init packet"); ret_val = NRF_DFU_RES_CODE_INVALID_OBJECT; } return ret_val; } // Function to check the hash received in the init command against the received firmware. static bool fw_hash_ok(dfu_init_command_t const * p_init, uint32_t fw_start_addr, uint32_t fw_size) { ret_code_t err_code; bool result = true; uint8_t hash_be[NRF_CRYPTO_HASH_SIZE_SHA256]; size_t hash_len = NRF_CRYPTO_HASH_SIZE_SHA256; ASSERT(p_init != NULL); // Convert to hash to big-endian format for use in nrf_crypto. nrf_crypto_internal_swap_endian(hash_be, (uint8_t *)p_init->hash.hash.bytes, NRF_CRYPTO_HASH_SIZE_SHA256); NRF_LOG_DEBUG("Hash verification. Firmware start address: 0x%x, size: 0x%x", fw_start_addr, fw_size); err_code = nrf_crypto_hash_calculate(&m_hash_context, &g_nrf_crypto_hash_sha256_info, (uint8_t*)fw_start_addr, fw_size, m_fw_hash, &hash_len); if (err_code != NRF_SUCCESS) { NRF_LOG_ERROR("Could not run hash verification (err_code 0x%x).", err_code); result = false; } else if (memcmp(m_fw_hash, hash_be, NRF_CRYPTO_HASH_SIZE_SHA256) != 0) { NRF_LOG_WARNING("Hash verification failed."); NRF_LOG_DEBUG("Expected FW hash:") NRF_LOG_HEXDUMP_DEBUG(p_init->hash.hash.bytes, NRF_CRYPTO_HASH_SIZE_SHA256); NRF_LOG_DEBUG("Actual FW hash:") NRF_LOG_HEXDUMP_DEBUG(m_fw_hash, NRF_CRYPTO_HASH_SIZE_SHA256); NRF_LOG_FLUSH(); result = false; } return result; } // Function to check whether the update contains a SoftDevice and, if so, if it is of a different // major version than the existing SoftDevice. static bool is_major_softdevice_update(uint32_t new_sd_addr) { // True if there is no SD right now, but there is a new one coming. This counts as a major update. bool result = !SD_PRESENT && (SD_MAGIC_NUMBER_GET(new_sd_addr) == SD_MAGIC_NUMBER); if (SD_PRESENT && (SD_MAGIC_NUMBER_GET(new_sd_addr) == SD_MAGIC_NUMBER)) { // Both SoftDevices are present. uint32_t current_SD_major = SD_MAJOR_VERSION_EXTRACT(SD_VERSION_GET(MBR_SIZE)); uint32_t new_SD_major = SD_MAJOR_VERSION_EXTRACT(SD_VERSION_GET(new_sd_addr)); result = (current_SD_major != new_SD_major); NRF_LOG_INFO("SoftDevice update is a %s version update. Current: %d. New: %d.", result ? "major" : "minor", current_SD_major, new_SD_major); } return result; } /**@brief Validate the SoftDevice size and magic number in structure found at 0x2000 in received SoftDevice. * * @param[in] sd_start_addr Start address of received SoftDevice. * @param[in] sd_size Size of received SoftDevice in bytes. */ static bool softdevice_info_ok(uint32_t sd_start_addr, uint32_t sd_size) { bool result = true; if (SD_MAGIC_NUMBER_GET(sd_start_addr) != SD_MAGIC_NUMBER) { NRF_LOG_ERROR("The SoftDevice does not contain the magic number identifying it as a SoftDevice."); result = false; } else if (SD_SIZE_GET(sd_start_addr) < ALIGN_TO_PAGE(sd_size + MBR_SIZE)) { // The size in the info struct should be rounded up to a page boundary // and be larger than the actual size + the size of the MBR. NRF_LOG_ERROR("The SoftDevice size in the info struct is too small compared with the size reported in the init command."); result = false; } return result; } static void postvalidate_app(dfu_init_command_t * p_init) { s_dfu_settings.bank_1.bank_code = NRF_DFU_BANK_VALID_APP; if (!DFU_REQUIRES_SOFTDEVICE && !update_requires_softdevice(p_init)) { // App does not need SD, so it should be placed where SD is. nrf_dfu_softdevice_invalidate(); } if (!NRF_DFU_DEBUG || (NRF_DFU_DEBUG && (p_init->has_is_debug == false || p_init->is_debug == false))) { s_dfu_settings.app_version = p_init->fw_version; } } // Function to check a received SoftDevice or Bootloader firmware, or both, // before it is copied into place. static bool postvalidate_sd_bl(dfu_init_command_t * p_init, bool with_sd, bool with_bl, uint32_t start_addr) { if (with_sd) { if (!softdevice_info_ok(start_addr, p_init->sd_size)) { return false; } if (is_major_softdevice_update(start_addr)) { NRF_LOG_WARNING("Invalidating app because it is incompatible with the SoftDevice."); if (DFU_REQUIRES_SOFTDEVICE && !with_bl) { NRF_LOG_ERROR("Major SD update but no BL. Abort to avoid incapacitating the BL."); return false; } // Invalidate app since it may not be compatible with new SD. nrf_dfu_bank_invalidate(&s_dfu_settings.bank_0); } // Mark the update as valid. s_dfu_settings.bank_1.bank_code = with_bl ? NRF_DFU_BANK_VALID_SD_BL : NRF_DFU_BANK_VALID_SD; s_dfu_settings.sd_size = p_init->sd_size; } else { s_dfu_settings.bank_1.bank_code = NRF_DFU_BANK_VALID_BL; } if (with_bl && (!NRF_DFU_DEBUG || (NRF_DFU_DEBUG && (p_init->has_is_debug == false || p_init->is_debug == false)))) { // If the update contains a bootloader, update the version. // Unless the update is a debug packet. s_dfu_settings.bootloader_version = p_init->fw_version; } return true; } nrf_dfu_result_t nrf_dfu_validation_post_data_execute(uint32_t src_addr, uint32_t data_len) { nrf_dfu_result_t ret_val = NRF_DFU_RES_CODE_SUCCESS; dfu_init_command_t * p_init = m_packet.has_signed_command ? &m_packet.signed_command.command.init : &m_packet.command.init; if (!fw_hash_ok(p_init, src_addr, data_len)) { ret_val = EXT_ERR(NRF_DFU_EXT_ERROR_VERIFICATION_FAILED); } else { if (p_init->type == DFU_FW_TYPE_APPLICATION) { #if defined(NRF_DFU_SUPPORTS_EXTERNAL_APP) && NRF_DFU_SUPPORTS_EXTERNAL_APP == 1 switch (nrf_dfu_validation_post_external_app_execute(p_init, false)) { case NRF_DFU_RES_CODE_INVALID: postvalidate_app(p_init); break; case NRF_DFU_RES_CODE_SUCCESS: s_dfu_settings.bank_1.bank_code = NRF_DFU_BANK_VALID_EXT_APP; break; default: ret_val = EXT_ERR(NRF_DFU_EXT_ERROR_VERIFICATION_FAILED); break; } #else postvalidate_app(p_init); #endif } else { bool with_sd = p_init->type & DFU_FW_TYPE_SOFTDEVICE; bool with_bl = p_init->type & DFU_FW_TYPE_BOOTLOADER; if (!postvalidate_sd_bl(p_init, with_sd, with_bl, src_addr)) { ret_val = NRF_DFU_RES_CODE_INVALID_OBJECT; if (with_sd && !DFU_REQUIRES_SOFTDEVICE && (src_addr == nrf_dfu_softdevice_start_address())) { nrf_dfu_softdevice_invalidate(); } } } } if (ret_val == NRF_DFU_RES_CODE_SUCCESS) { if(s_dfu_settings.settings_version == 1) { // Store CRC32 for image. s_dfu_settings.bank_1.image_crc = s_dfu_settings.progress.firmware_image_crc; s_dfu_settings.bank_1.image_size = data_len; } else if(s_dfu_settings.settings_version == 2) { s_dfu_settings.bank_current = NRF_DFU_CURRENT_BANK_1; } } else { nrf_dfu_bank_invalidate(&s_dfu_settings.bank_1); } if(s_dfu_settings.settings_version == 1) { // Set the progress to zero and remove the last command. memset(&s_dfu_settings.progress, 0, sizeof(dfu_progress_t)); memset(s_dfu_settings.init_command, 0xFF, DFU_SIGNED_COMMAND_SIZE); s_dfu_settings.write_offset = 0; s_dfu_settings.progress.update_start_address = src_addr; } return ret_val; } bool nrf_dfu_validation_valid_external_app(void) { return s_dfu_settings.bank_1.bank_code == NRF_DFU_BANK_VALID_EXT_APP; } ret_code_t nrf_dfu_validation_invalidate_external_app(nrf_dfu_flash_callback_t callback) { nrf_dfu_bank_invalidate(&s_dfu_settings.bank_1); return nrf_dfu_settings_write(callback); }