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.config
*.o
*.pyc
# gtags
GTAGS
GRTAGS
GPATH
# emacs
.dir-locals.el
# emacs temp file suffixes
*~
.#*
\#*#
# eclipse setting
.settings
# MacOS directory files
.DS_Store
# Example project files
examples/**/sdkconfig
examples/**/sdkconfig.old
examples/**/build
# Doc build artifacts
docs/_build/
docs/doxygen_sqlite3.db
# Downloaded font files
docs/_static/DejaVuSans.ttf
docs/_static/NotoSansSC-Regular.otf
# Unit test app files
tools/unit-test-app/sdkconfig
tools/unit-test-app/sdkconfig.old
tools/unit-test-app/build
tools/unit-test-app/builds
tools/unit-test-app/output
tools/unit-test-app/test_configs
# Unit Test CMake compile log folder
log_ut_cmake
# test application build files
tools/test_apps/**/build
tools/test_apps/**/sdkconfig
tools/test_apps/**/sdkconfig.old
# IDF monitor test
tools/test_idf_monitor/outputs
TEST_LOGS
# gcov coverage reports
*.gcda
*.gcno
coverage.info
coverage_report/
test_multi_heap_host
# VS Code Settings
.vscode/
# VIM files
*.swp
*.swo
# Clion IDE CMake build & config
.idea/
cmake-build-*/
# Results for the checking of the Python coding style and static analysis
.mypy_cache
flake8_output.txt
# ESP-IDF default build directory name
build
# lock files for examples and components
dependencies.lock
build/
sdkconfig
sdkconfig.old

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# The following lines of boilerplate have to be in your project's
# CMakeLists in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(esp-ena)

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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
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The licenses for most software and other practical works are designed
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
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it under the terms of the GNU Affero General Public License as published by
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# esp-ena
Implementation of the Covid19 Exposure Notification API by Apple and Google on an ESP32.
More information about the Covid19 Exposure Notification at [Apple](https://www.apple.com/covid19/contacttracing/) and [Google](https://www.google.com/covid19/exposurenotifications/). This is meant for people without smartphone or without smartphones with Apples/Googles implementation.
This implementation covers for now the BLE part including the cryptography specifications needed (see Bluetooth Specifications and Cryptography Specifications documents in the links above):
* send tokens
* store send tokens on flash (last 14 tokens)
* receive tokens
* received tokens are stored after 5 minutes threshold (storage is limited, ~100k tokens can be stored)
Features missing for now are:
* compare received tokens with infected list
* calculating risks scores
Extensions planned:
* add RTC (will test DS3231)
* add display (will test SSD1306)
* interface to
* set time
* delete tokens
* show status
* report infection?
* receive infected token list for Germany (will test [Corona Warn App](https://github.com/corona-warn-app))
* send infected status (will test [Corona Warn App](https://github.com/corona-warn-app))
* battery support
* 3d print case
Limitations/Problems
* storage only ~2.8mb available
* WiFi or other external connection needed for infections status (auto-connect to open WiFis?)
* obtaining accessibility
* all parameters (scanning time, thresholds etc.)
The following acronyms will be used in code and comments:
* *ENA* Exposure Notification Api
* *ENIN* ENIntervalNumber - timestamp with 10 minutes resolution
* *TEK* Temporary Exposure Key - personal secret key changed every 24h, published when infected
* *RPI* Rolling Proximity Identifier - send and received identifer changed every 10 minutes
* *AEM* Associated Encrypted Metadata - send and received metadata
Open questions
* now save ENIN for stored detection (documentation says timestamp), but for infection status ENIN should be enough!?
* service UUID is send reversed, must RPI and AEM also beeing send in reverse? Don't know BLE specification enough
* fixed change of advertise payload every 10 minutes, random value between ~15 minutes better?
## How to use
### Hardware Required
For now just an ESP32 is required. For full device later RTC (DS3231) and Display (SSD1306) will be required.
### Configure the project
```
idf.py menuconfig
```
required
* enable bluetooth (BLE)
* add partition-table for storage (currently hardcoded name "ena")
* mbedTLS enable HKDF
recommended
* BLE Scan Duplicate (By Device Address and Advertising Data)
### Build and Flash
Build the project and flash it to the board, then run monitor tool to view serial output:
```
idf.py -p PORT flash monitor
```
(Replace PORT with the name of the serial port to use.)
(To exit the serial monitor, type ``Ctrl-]``.)
## Example Output
For now some debug outputs are set. Besides, after each scan a CSV output is printed with stored TEKs, temporary detections (RPI) and full detections (RPI)
```
I (1201484) ESP-ENA-advertise: payload for ENIN 2657432
D (1201494) ESP-ENA-advertise: 0x3ffbb6c4 02 01 1a 03 03 6f fd 17 16 6f fd 9a ee 95 9a 24 |.....o...o.....$|
D (1201494) ESP-ENA-advertise: 0x3ffbb6d4 f0 f9 8e 56 0f 6d 68 5f ac 12 e5 7f 94 a1 47 |...V.mh_......G|
I (1201524) ESP-ENA-scan: start scanning...
D (1202224) ESP-ENA-detection: New temporary detection at 0 with timestamp 1594459201
D (1202224) ESP-ENA-detection: 19 05 e3 3a 73 16 4e 74 2d 48 fc 0c 41 f6 26 3b
D (1202234) ESP-ENA-detection: 5e 7d a9 48
D (1202234) ESP-ENA-detection: RSSI -79
#,enin,tek
0,2657430,d5 13 92 b2 44 e4 7e b6 ca a7 20 c4 f 37 c0 1c
#,timestamp,rpi,aem,rssi
0,1594459201,19 5 e3 3a 73 16 4e 74 2d 48 fc c 41 f6 26 3b,5e 7d a9 48,-79
#,enin,rpi,aem,rssi
0,2657430,c7 2e b6 66 af 84 42 db b d1 a 0 f1 fd 86 2,4d 1 b2 d1,-76
1,2657431,19 5 e3 3a 73 16 4e 74 2d 48 fc c 41 f6 26 3b,5e 7d a9 48,-76
I (1231754) ESP-ENA-scan: finished scanning...
```
## Troubleshooting
Sometimes I get errors from BT-stack of ESP-IDF printed. Didn't affect functionality for now, but I also could not find out what it caused and what it means.
```
E (909164) BT_HCI: btu_hcif_hdl_command_complete opcode 0x2005 status 0xc
```
## Structure
The project is divided in different files
* *ena-crypto* covers cryptography part (key creation, encryption etc.)
* *ena-storage* storage part to store own TEKs and detections
* *ena-detection* handles scanned data by storing temporary detections, check for threshold and store full detections
* *ena-bluetooth-scan* BLE scans for detecting other tokens
* *ena-bluetooth-advertise* BLE advertising to send own tokens
* *ena* run all together and timing for scanning and advertising
* *main* start and run main program

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idf_component_register(
SRCS "ena-detection.c" "ena-storage.c" "ena-crypto.c" "main.c" "ena.c" "ena-bluetooth-scan.c" "ena-bluetooth-advertise.c" "ena-detection.c"
INCLUDE_DIRS ""
)

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#
# "main" pseudo-component makefile.
#
# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

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#include "esp_log.h"
#include "esp_bt.h"
#include "ena-crypto.h"
#include "ena-bluetooth-advertise.h"
static esp_ble_adv_params_t ena_adv_params = {
.adv_int_min = 0x140, // 200 ms
.adv_int_max = 0x190, // 250 ms
.adv_type = ADV_TYPE_NONCONN_IND,
.own_addr_type = BLE_ADDR_TYPE_RANDOM,
.channel_map = ADV_CHNL_ALL,
.adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
};
void ena_bluetooth_advertise_start(void)
{
ESP_ERROR_CHECK(esp_ble_gap_start_advertising(&ena_adv_params));
}
void ena_bluetooth_advertise_set_payload(uint32_t enin, uint8_t tek[])
{
uint8_t rpik[ENA_KEY_LENGTH] = {0};
uint8_t rpi[ENA_KEY_LENGTH] = {0};
uint8_t aemk[ENA_KEY_LENGTH] = {0};
uint8_t aem[ENA_AEM_METADATA_LENGTH] = {0};
ena_crypto_rpik(rpik, tek);
ena_crypto_rpi(rpi, rpik, enin);
ena_crypto_aemk(aemk, tek);
ena_crypto_aem(aem, aemk, rpi, esp_ble_tx_power_get(ESP_BLE_PWR_TYPE_ADV));
uint8_t adv_raw_data[31];
// FLAG??? skipped on sniffed android packages!?
adv_raw_data[0] = 0x02;
adv_raw_data[1] = 0x01;
adv_raw_data[2] = ENA_BLUETOOTH_TAG_DATA;
// SERVICE UUID
adv_raw_data[3] = 0x03;
adv_raw_data[4] = 0x03;
adv_raw_data[5] = 0x6F;
adv_raw_data[6] = 0xFD;
// SERVICE DATA
adv_raw_data[7] = 0x17;
adv_raw_data[8] = 0x16;
adv_raw_data[9] = 0x6F;
adv_raw_data[10] = 0xFD;
for (int i = 0; i < ENA_KEY_LENGTH; i++)
{
adv_raw_data[i + 11] = rpi[i];
}
for (int i = 0; i < ENA_AEM_METADATA_LENGTH; i++)
{
adv_raw_data[i + ENA_KEY_LENGTH + 11] = aem[i];
}
esp_ble_gap_config_adv_data_raw(adv_raw_data, sizeof(adv_raw_data));
ESP_LOGI(ENA_ADVERTISE_LOG, "payload for ENIN %u", enin);
ESP_LOG_BUFFER_HEXDUMP(ENA_ADVERTISE_LOG, adv_raw_data, sizeof(adv_raw_data), ESP_LOG_DEBUG);
}
void ena_bluetooth_advertise_stop(void)
{
ESP_ERROR_CHECK(esp_ble_gap_stop_advertising());
}

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/**
* provide bluetooth part of Exposure Notification API v1.2 as defined by Apple/Google
*
* Source documents:
*
* https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
*
* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf
*
*
*
*/
#ifndef _ena_BLUETOOTH_ADVERTISE_H_
#define _ena_BLUETOOTH_ADVERTISE_H_
#include "esp_gap_ble_api.h"
#define ENA_ADVERTISE_LOG "ESP-ENA-advertise" // TAG for Logging
#define ENA_BLUETOOTH_TAG_DATA 0x1A
void ena_bluetooth_advertise_start(void);
void ena_bluetooth_advertise_set_payload(uint32_t enin, uint8_t tek[]);
void ena_bluetooth_advertise_stop(void);
#endif

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#include <stdio.h>
#include <time.h>
#include "esp_log.h"
#include "ena-detection.h"
#include "ena-bluetooth-scan.h"
static int scan_status = ENA_SCAN_STATUS_NOT_SCANNING;
static esp_ble_scan_params_t ena_scan_params = {
.scan_type = BLE_SCAN_TYPE_ACTIVE,
.own_addr_type = BLE_ADDR_TYPE_RANDOM,
.scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL,
.scan_interval = 0x50, // don't know good parameters, just copied
.scan_window = 0x30, // don't know good parameters, just copied
.scan_duplicate = BLE_SCAN_DUPLICATE_ENABLE,
};
void ena_bluetooth_scan_event_callback(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
esp_ble_gap_cb_param_t *p = (esp_ble_gap_cb_param_t *)param;
switch (event)
{
case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
ESP_LOGI(ENA_SCAN_LOG, "start scanning...");
break;
case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
ESP_LOGI(ENA_SCAN_LOG, "stopped scanning...");
ena_detections_temp_refresh((uint32_t)time(NULL));
break;
case ESP_GAP_BLE_SCAN_RESULT_EVT:
if (p->scan_rst.search_evt == ESP_GAP_SEARCH_INQ_RES_EVT)
{
// check for ENA Service UUID:
if (p->scan_rst.ble_adv[0] == 0x3 && p->scan_rst.ble_adv[1] == 0x3 && p->scan_rst.ble_adv[2] == 0x6f && p->scan_rst.ble_adv[3] == 0xfd)
{
uint8_t rpi[ENA_KEY_LENGTH] = {0};
for (int i = 0; i < ENA_KEY_LENGTH; i++)
{
rpi[i] = p->scan_rst.ble_adv[8 + i];
}
uint8_t aem[ENA_AEM_METADATA_LENGTH] = {0};
for (int i = 0; i < ENA_AEM_METADATA_LENGTH; i++)
{
aem[i] = p->scan_rst.ble_adv[8 + ENA_KEY_LENGTH + i];
}
ena_detection((uint32_t)time(NULL), rpi, aem, p->scan_rst.rssi);
}
}
else if (p->scan_rst.search_evt == ESP_GAP_SEARCH_INQ_CMPL_EVT)
{
scan_status = ENA_SCAN_STATUS_NOT_SCANNING;
ena_detections_temp_refresh((uint32_t)time(NULL));
ESP_LOGI(ENA_SCAN_LOG, "finished scanning...");
}
break;
default:
// nothing
break;
}
}
void ena_bluetooth_scan_init(void)
{
ESP_ERROR_CHECK(esp_ble_gap_set_scan_params(&ena_scan_params));
ESP_ERROR_CHECK(esp_ble_gap_register_callback(ena_bluetooth_scan_event_callback));
// init temporary detections
ena_detections_temp_refresh((uint32_t)time(NULL));
}
void ena_bluetooth_scan_start(uint32_t duration)
{
scan_status = ENA_SCAN_STATUS_SCANNING;
ESP_ERROR_CHECK(esp_ble_gap_start_scanning(duration));
}
void ena_bluetooth_scan_stop(void)
{
scan_status = ENA_SCAN_STATUS_WAITING;
ESP_ERROR_CHECK(esp_ble_gap_stop_scanning());
}
int ena_bluetooth_scan_get_status(void)
{
return scan_status;
}

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/**
* provide bluetooth scanning part of Exposure Notification API v1.2 as defined by Apple/Google
*
* Source documents:
*
* https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
*
* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf
*
*
*
*/
#ifndef _ena_BLUETOOTH_SCAN_H_
#define _ena_BLUETOOTH_SCAN_H_
#define ENA_SCAN_LOG "ESP-ENA-scan" // TAG for Logging
#define ENA_SCANNING_TIME 30 // scan for 30 seconds
#define ENA_SCANNING_INTERVAL 300 // scan every 5 minutes
#include "esp_gap_ble_api.h"
typedef enum
{
ENA_SCAN_STATUS_SCANNING = 0,
ENA_SCAN_STATUS_NOT_SCANNING,
ENA_SCAN_STATUS_WAITING,
} ena_bluetooth_scan_status;
void ena_bluetooth_scan_init(void);
void ena_bluetooth_scan_start(uint32_t duration);
void ena_bluetooth_scan_stop(void);
int ena_bluetooth_scan_get_status(void);
#endif

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#include "mbedtls/md.h"
#include "mbedtls/aes.h"
#include "mbedtls/hkdf.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "esp_log.h"
#include "ena-crypto.h"
#define ESP_CRYPTO_LOG "ESP-CRYPTO"
static mbedtls_ctr_drbg_context ctr_drbg;
void ena_crypto_init(void)
{
mbedtls_entropy_context entropy;
uint8_t pers[] = "Exposure Notifcation API esp32";
int ret;
mbedtls_entropy_init(&entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, pers, sizeof(pers))) != 0)
{
ESP_LOGE(ESP_CRYPTO_LOG, " failed\n ! mbedtls_ctr_drbg_init returned -0x%04x\n", -ret);
}
}
uint32_t ena_crypto_enin(uint32_t unix_epoch_time)
{
return unix_epoch_time / ENA_TIME_WINDOW;
}
void ena_crypto_tek(uint8_t tek[])
{
int ret;
if ((ret = mbedtls_ctr_drbg_random(&ctr_drbg, tek, ENA_KEY_LENGTH)) != 0)
{
ESP_LOGE(ESP_CRYPTO_LOG, " failed\n ! mbedtls_ctr_drbg_random returned -0x%04x\n", -ret);
}
}
void ena_crypto_rpik(uint8_t rpik[], uint8_t tek[])
{
const uint8_t rpik_info[] = "EN-RPIK";
mbedtls_hkdf(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), NULL, 0, tek, ENA_KEY_LENGTH, rpik_info, sizeof(rpik_info), rpik, ENA_KEY_LENGTH);
}
void ena_crypto_rpi(uint8_t rpi[], uint8_t rpik[], uint32_t enin)
{
uint8_t padded_data[ENA_KEY_LENGTH] = "EN-RPI";
padded_data[12] = (enin & 0x000000ff);
padded_data[13] = (enin & 0x0000ff00) >> 8;
padded_data[14] = (enin & 0x00ff0000) >> 16;
padded_data[15] = (enin & 0xff000000) >> 24;
mbedtls_aes_context aes;
mbedtls_aes_init(&aes);
mbedtls_aes_setkey_enc(&aes, rpik, ENA_KEY_LENGTH * 8);
mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_ENCRYPT, padded_data, rpi);
mbedtls_aes_free(&aes);
}
void ena_crypto_aemk(uint8_t aemk[], uint8_t tek[])
{
uint8_t aemkInfo[] = "EN-AEMK";
mbedtls_hkdf(mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), NULL, 0, tek, ENA_KEY_LENGTH, aemkInfo, sizeof(aemkInfo), aemk, ENA_KEY_LENGTH);
}
void ena_crypto_aem(uint8_t aem[], uint8_t aemk[], uint8_t rpi[], uint8_t power_level)
{
uint8_t metadata[ENA_AEM_METADATA_LENGTH];
metadata[0] = 0b01000000;
metadata[1] = power_level;
size_t count = 0;
uint8_t sb[16] = {0};
mbedtls_aes_context aes;
mbedtls_aes_init(&aes);
mbedtls_aes_setkey_enc(&aes, aemk, ENA_KEY_LENGTH * 8);
mbedtls_aes_crypt_ctr(&aes, ENA_AEM_METADATA_LENGTH, &count, rpi, sb, metadata, aem);
mbedtls_aes_free(&aes);
}

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/**
* provide cryptographic part of Exposure Notification API v1.2 as defined by Apple/Google
*
* Source documents:
*
* https://blog.google/documents/69/Exposure_Notification_-_Cryptography_Specification_v1.2.1.pdf
*
* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-CryptographySpecificationv1.2.pdf
*
*
*
*/
#ifndef _ena_CRYPTO_H_
#define _ena_CRYPTO_H_
#define ENA_TIME_WINDOW 600 // time window every 10 minutes
#define ENA_KEY_LENGTH 16 // key length
#define ENA_AEM_METADATA_LENGTH 4 // size of metadata
#define ENA_TEK_ROLLING_PERIOD 144 // TEKRollingPeriod
#include <stdio.h>
/**
* initialize crypto (setup entropy for key generation)
*/
void ena_crypto_init(void);
/**
* Calculate ENIntervalNumber (ENIN) for given UNIX timestamp
*/
uint32_t ena_crypto_enin(uint32_t seconds);
/**
* calculate a new random Temporary Exposure Key (TEK)
*/
void ena_crypto_tek(uint8_t tek[]);
/**
* calculate a new Rolling Proximity Identifier Key (RPIK) with given TEK
*/
void ena_crypto_rpik(uint8_t rpik[], uint8_t tek[]);
/**
* calculate a new Rolling Proximity Identifier with given RPIK and ENIN
*/
void ena_crypto_rpi(uint8_t rpi[], uint8_t rpik[], uint32_t enin);
/**
* calculate a new Associated Encrypted Metadata Key (AEMK) with given TEK
*/
void ena_crypto_aemk(uint8_t aemk[], uint8_t tek[]);
/**
* create Associated Encrypted Metadata (AEM) with given AEMK along the RPI
*/
void ena_crypto_aem(uint8_t aem[], uint8_t aemk[], uint8_t rpi[], uint8_t power_level);
#endif

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#include <string.h>
#include "esp_log.h"
#include "ena-crypto.h"
#include "ena-storage.h"
#include "ena-detection.h"
static uint32_t temp_detections_count = 0;
static uint8_t temp_detection_rpi[ENA_STOARGE_TEMP_DETECTIONS_MAX][ENA_KEY_LENGTH] = {{0}};
static uint8_t temp_detection_aem[ENA_STOARGE_TEMP_DETECTIONS_MAX][ENA_AEM_METADATA_LENGTH] = {{0}};
static uint32_t temp_detection_timestamp_first[ENA_STOARGE_TEMP_DETECTIONS_MAX] = {0};
static uint32_t temp_detection_timestamp_last[ENA_STOARGE_TEMP_DETECTIONS_MAX] = {0};
static int temp_detection_rssi_last[ENA_STOARGE_TEMP_DETECTIONS_MAX] = {0};
int ena_get_temp_detection_index(uint8_t rpi[], uint8_t aem[])
{
for (int i = 0; i < temp_detections_count; i++)
{
if (memcmp(temp_detection_rpi[i], rpi, sizeof(ENA_KEY_LENGTH)) == 0 &&
memcmp(temp_detection_aem[i], aem, sizeof(ENA_AEM_METADATA_LENGTH)) == 0)
{
return i;
}
}
return -1;
}
void ena_detections_temp_refresh(uint32_t unix_timestamp)
{
for (int i = 0; i < temp_detections_count; i++)
{
// check for treshold and add permanent detection
if (temp_detection_timestamp_last[i] - temp_detection_timestamp_first[i] >= ENA_DETECTION_TRESHOLD)
{
ESP_LOGD(ENA_DETECTION_LOG, "create detection after treshold");
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, temp_detection_rpi[i], ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ena_storage_write_detection(ena_crypto_enin(temp_detection_timestamp_first[i]), temp_detection_rpi[i],
temp_detection_aem[i], temp_detection_rssi_last[i]);
ena_storage_remove_temp_detection(i);
}
else
// delete temp detections older than two times time window (two times to be safe, one times time window enough?!)
if (unix_timestamp - temp_detection_timestamp_first[i] > (ENA_TIME_WINDOW * 2))
{
ESP_LOGD(ENA_DETECTION_LOG, "remove old temporary detection %u", i);
ena_storage_remove_temp_detection(i);
}
}
// update detections
temp_detections_count = ena_storage_temp_detections_count();
for (int i = 0; i < temp_detections_count; i++)
{
ena_storage_read_temp_detection(i, &temp_detection_timestamp_first[i], temp_detection_rpi[i], temp_detection_aem[i], &temp_detection_rssi_last[i]);
}
// DEBUG dump
ena_storage_dump_tek();
ena_storage_dump_temp_detections();
ena_storage_dump_detections();
}
void ena_detection(uint32_t unix_timestamp, uint8_t rpi[], uint8_t aem[], int rssi)
{
uint32_t detection_index = ena_get_temp_detection_index(rpi, aem);
if (detection_index == -1)
{
temp_detection_timestamp_first[temp_detections_count] = unix_timestamp;
memcpy(temp_detection_rpi[temp_detections_count], rpi, ENA_KEY_LENGTH);
memcpy(temp_detection_aem[temp_detections_count], aem, ENA_AEM_METADATA_LENGTH);
temp_detection_rssi_last[temp_detections_count] = rssi;
temp_detection_timestamp_last[temp_detections_count] = unix_timestamp;
detection_index = ena_storage_write_temp_detection(unix_timestamp, rpi, aem, rssi);
ESP_LOGD(ENA_DETECTION_LOG, "New temporary detection at %d with timestamp %u", temp_detections_count, unix_timestamp);
ESP_LOG_BUFFER_HEX_LEVEL(ENA_DETECTION_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOG_BUFFER_HEX_LEVEL(ENA_DETECTION_LOG, aem, ENA_AEM_METADATA_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_DETECTION_LOG, "RSSI %d", rssi);
if (detection_index != temp_detections_count)
{
ESP_LOGW(ENA_DETECTION_LOG, "last temporary detection index does not match array index!");
}
temp_detections_count++;
}
else
{
temp_detection_rssi_last[detection_index] = rssi;
temp_detection_timestamp_last[detection_index] = unix_timestamp;
ESP_LOGD(ENA_DETECTION_LOG, "New Timestamp for temporary detection %d: %u", detection_index, unix_timestamp);
}
}

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/**
* combine bluetooth and crypto parts to build EXPOSURE NOTIFICATION
*
*/
#ifndef _ena_DETECTION_H_
#define _ena_DETECTION_H_
#define ENA_DETECTION_LOG "ESP-ENA-detection" // TAG for Logging
#define ENA_DETECTION_TRESHOLD 300 // meet for longer than 5 minutes
#include "ena-crypto.h"
void ena_detections_temp_refresh(uint32_t unix_timestamp);
void ena_detection(uint32_t unix_timestamp, uint8_t rpi[], uint8_t aem[], int rssi);
#endif

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#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_partition.h"
#include "esp_spi_flash.h"
#include "esp_log.h"
#include "ena-storage.h"
#include "ena-crypto.h"
#define BLOCK_SIZE 4096
void ena_storage_read(size_t address, uint8_t *data, size_t size)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_read");
const esp_partition_t *partition = esp_partition_find_first(
ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, PARTITION_NAME);
assert(partition);
ESP_ERROR_CHECK(esp_partition_read(partition, address, data, size));
vTaskDelay(1);
ESP_LOGD(ENA_STORAGE_LOG, "read data at %u", address);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, data, size, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_read");
}
void ena_storage_write(size_t address, uint8_t data[], size_t size)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_write");
const esp_partition_t *partition = esp_partition_find_first(
ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, PARTITION_NAME);
assert(partition);
const int block_num = address / BLOCK_SIZE;
// split if size extends block
if (address + size > (block_num + 1) * BLOCK_SIZE)
{
ESP_LOGI(ENA_STORAGE_LOG, "overflow block at address %u with size %d (block %d)", address, size, block_num);
const size_t block1_address = address;
const size_t block2_address = (block_num + 1) * BLOCK_SIZE;
const size_t data2_size = address + size - block2_address;
const size_t data1_size = size - data2_size;
ESP_LOGD(ENA_STORAGE_LOG, "block1_address %d, block1_size %d (block %d)", block1_address, data1_size, block_num);
ESP_LOGD(ENA_STORAGE_LOG, "block2_address %d, block2_size %d (block %d)", block2_address, data2_size, block_num + 1);
uint8_t *data1 = malloc(data1_size);
for (int i = 0; i < data1_size; i++)
{
data1[i] = data[i];
}
uint8_t *data2 = malloc(data2_size);
for (int i = 0; i < data2_size; i++)
{
data2[i] = data[data1_size + i];
}
ena_storage_write(block1_address, data1, data1_size);
free(data1);
ena_storage_write(block2_address, data2, data2_size);
free(data2);
}
else
{
const int block_start = block_num * BLOCK_SIZE;
const int block_address = address - block_start;
uint8_t *buffer = malloc(BLOCK_SIZE);
if (buffer == NULL)
{
ESP_LOGE(ENA_STORAGE_LOG, "Warning %s malloc low memory", "buffer");
return;
}
ESP_LOGD(ENA_STORAGE_LOG, "read block %d buffer: start %d size %u", block_num, block_start, BLOCK_SIZE);
ESP_ERROR_CHECK(esp_partition_read(partition, block_start, buffer, BLOCK_SIZE));
vTaskDelay(1);
ESP_ERROR_CHECK(esp_partition_erase_range(partition, block_start, BLOCK_SIZE));
for (int i = 0; i < size; i++)
{
buffer[block_address + i] = data[i];
}
ESP_ERROR_CHECK(esp_partition_write(partition, block_start, buffer, BLOCK_SIZE));
free(buffer);
ESP_LOGD(ENA_STORAGE_LOG, "write data at %u", address);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, data, size, ESP_LOG_DEBUG);
}
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_write");
}
void ena_storage_shift_delete(size_t address, size_t size)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_shift_delete");
const esp_partition_t *partition = esp_partition_find_first(
ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, PARTITION_NAME);
assert(partition);
const int block_num = address / BLOCK_SIZE;
// split if size extends block TODO this does not work like this!!! Shift puts data back to first block!
if (address + size > (block_num + 1) * BLOCK_SIZE)
{
const int block1_address = address;
const int block2_address = (block_num + 1) * BLOCK_SIZE;
const int data2_size = address + size - block2_address;
const int data1_size = size - data2_size;
ena_storage_shift_delete(block1_address, data1_size);
ena_storage_shift_delete(block2_address, data2_size);
}
else
{
const int block_start = block_num * BLOCK_SIZE;
const int block_address = address - block_start;
uint8_t *buffer = malloc(BLOCK_SIZE);
ESP_ERROR_CHECK(esp_partition_read(partition, block_start, buffer, BLOCK_SIZE));
vTaskDelay(1);
ESP_LOGD(ENA_STORAGE_LOG, "shift block from %u to %u with size %u (move %u)", block_address, block_address + size, size, BLOCK_SIZE - address + size);
// shift manually
for (int i = block_address + size; i < BLOCK_SIZE; i++)
{
buffer[i - size] = buffer[i];
}
for (int i = BLOCK_SIZE - size; i < BLOCK_SIZE; i++)
{
buffer[i] = 0;
}
// memmove seems to lead to corrupt heap memory!
// memmove(&buffer[block_address], &buffer[block_address + size], BLOCK_SIZE - address + size);
ESP_ERROR_CHECK(esp_partition_erase_range(partition, block_start, BLOCK_SIZE));
ESP_ERROR_CHECK(esp_partition_write(partition, block_start, buffer, BLOCK_SIZE));
free(buffer);
}
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_shift_delete");
}
void ena_storage_write_tek(uint32_t enin, uint8_t tek[])
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_write_tek");
uint8_t tek_count = ena_storage_read_u8(ENA_STORAGE_TEK_COUNT_ADDRESS);
size_t address = ENA_STORAGE_TEK_START_ADDRESS + (tek_count * ENA_STORAGE_TEK_LENGTH);
ena_storage_write_u32(address, enin);
ena_storage_write(address + 4, tek, ENA_KEY_LENGTH);
tek_count++;
if (tek_count > ENA_STOARGE_TEK_STORE_PERIOD)
{
tek_count = 0;
}
ena_storage_write_u8(ENA_STORAGE_TEK_COUNT_ADDRESS, tek_count);
ESP_LOGD(ENA_STORAGE_LOG, "write tek: ENIN %u", enin);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, tek, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_write_tek");
}
uint32_t ena_storage_read_enin(void)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_read_enin");
uint8_t tek_count = ena_storage_read_u8(ENA_STORAGE_TEK_COUNT_ADDRESS);
if (tek_count < 1)
{
return 0;
}
size_t address = ENA_STORAGE_TEK_START_ADDRESS + (tek_count - 1) * ENA_STORAGE_TEK_LENGTH;
uint32_t result = ena_storage_read_u32(address);
ESP_LOGD(ENA_STORAGE_LOG, "read last ENIN: %u", result);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_read_enin");
return result;
}
void ena_storage_read_tek(uint8_t tek[])
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_read_tek");
uint8_t tek_count = ena_storage_read_u8(ENA_STORAGE_TEK_COUNT_ADDRESS);
if (tek_count < 1)
{
return;
}
size_t address = ENA_STORAGE_TEK_START_ADDRESS + (tek_count - 1) * ENA_STORAGE_TEK_LENGTH + 4;
ena_storage_read(address, tek, ENA_KEY_LENGTH);
ESP_LOGD(ENA_STORAGE_LOG, "read last tek:");
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, tek, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_read_tek");
}
uint32_t ena_storage_temp_detections_count(void)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_temp_detections_count");
uint32_t count = ena_storage_read_u32(ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS);
ESP_LOGD(ENA_STORAGE_LOG, "read temp contancts count: %u", count);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_temp_detections_count");
return count;
}
uint32_t ena_storage_write_temp_detection(uint32_t timestamp, uint8_t rpi[], uint8_t aem[], int rssi)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_write_temp_detection");
uint32_t count = ena_storage_temp_detections_count() + 1;
// start overwriting temporay detections?!
if (count > ENA_STOARGE_TEMP_DETECTIONS_MAX)
{
count = 1;
}
size_t address = ENA_STORAGE_TEMP_DETECTIONS_START_ADDRESS + (count - 1) * ENA_STORAGE_DETECTION_LENGTH;
ena_storage_write_u32(address, timestamp);
address += 4;
ena_storage_write(address, rpi, ENA_KEY_LENGTH);
address += ENA_KEY_LENGTH;
ena_storage_write(address, aem, ENA_AEM_METADATA_LENGTH);
address += ENA_AEM_METADATA_LENGTH;
ena_storage_write_int(address, rssi);
ena_storage_write_u32(ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS, count);
ESP_LOGD(ENA_STORAGE_LOG, "write temp detection: timestamp %u and rssi %d", timestamp, rssi);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, aem, ENA_AEM_METADATA_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_write_temp_detection");
return count - 1;
}
void ena_storage_read_temp_detection(uint32_t index, uint32_t *timestamp, uint8_t rpi[], uint8_t aem[], int *rssi)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_read_temp_detection");
size_t address = ENA_STORAGE_TEMP_DETECTIONS_START_ADDRESS + index * ENA_STORAGE_DETECTION_LENGTH;
*timestamp = ena_storage_read_u32(address);
address += 4;
ena_storage_read(address, rpi, ENA_KEY_LENGTH);
address += ENA_KEY_LENGTH;
ena_storage_read(address, aem, ENA_AEM_METADATA_LENGTH);
address += 4;
*rssi = ena_storage_read_int(address);
ESP_LOGD(ENA_STORAGE_LOG, "read temp detection: timestamp %u and rssi %d", *timestamp, *rssi);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, aem, ENA_AEM_METADATA_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_read_temp_detection");
}
void ena_storage_remove_temp_detection(uint32_t index)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_remove_temp_detection");
size_t address = ENA_STORAGE_TEMP_DETECTIONS_START_ADDRESS + index * ENA_STORAGE_DETECTION_LENGTH;
ena_storage_shift_delete(address, ENA_STORAGE_DETECTION_LENGTH);
uint32_t count = ena_storage_temp_detections_count();
count--;
ena_storage_write_u32(ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS, count);
ESP_LOGD(ENA_STORAGE_LOG, "remove temp detection: %u", index);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_remove_temp_detection");
}
uint32_t ena_storage_detections_count(void)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_detections_count");
uint32_t count = ena_storage_read_u32(ENA_STORAGE_DETECTIONS_COUNT_ADDRESS);
ESP_LOGD(ENA_STORAGE_LOG, "read contancts count: %u", count);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_detections_count");
return count;
}
void ena_storage_write_detection(uint32_t timestamp, uint8_t rpi[], uint8_t aem[], int rssi)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_write_detection");
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
uint32_t count = ena_storage_detections_count() + 1;
size_t address = ENA_STORAGE_DETECTIONS_START_ADDRESS + (count - 1) * ENA_STORAGE_DETECTION_LENGTH;
ena_storage_write_u32(address, timestamp);
address += 4;
ena_storage_write(address, rpi, ENA_KEY_LENGTH);
address += ENA_KEY_LENGTH;
ena_storage_write(address, aem, ENA_AEM_METADATA_LENGTH);
address += ENA_AEM_METADATA_LENGTH;
ena_storage_write_int(address, rssi);
ena_storage_write_u32(ENA_STORAGE_DETECTIONS_COUNT_ADDRESS, count);
ESP_LOGD(ENA_STORAGE_LOG, "write detection: timestamp %u and rssi %d", timestamp, rssi);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, aem, ENA_AEM_METADATA_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_write_detection");
}
void ena_storage_read_detection(uint32_t index, uint32_t *timestamp, uint8_t rpi[], uint8_t aem[], int *rssi)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_read_detection");
size_t address = ENA_STORAGE_DETECTIONS_START_ADDRESS + index * ENA_STORAGE_DETECTION_LENGTH;
*timestamp = ena_storage_read_u32(address);
address += 4;
ena_storage_read(address, rpi, ENA_KEY_LENGTH);
address += ENA_KEY_LENGTH;
ena_storage_read(address, aem, ENA_AEM_METADATA_LENGTH);
address += 4;
*rssi = ena_storage_read_int(address);
ESP_LOGD(ENA_STORAGE_LOG, "read detection: timestamp %u and rssi %d", *timestamp, *rssi);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, rpi, ENA_KEY_LENGTH, ESP_LOG_DEBUG);
ESP_LOG_BUFFER_HEXDUMP(ENA_STORAGE_LOG, aem, ENA_AEM_METADATA_LENGTH, ESP_LOG_DEBUG);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_read_detection");
}
uint8_t ena_storage_read_u8(size_t address)
{
uint8_t data[1] = {0};
ena_storage_read(address, (uint8_t *)&data, 1);
return data[0];
}
uint32_t ena_storage_read_u32(size_t address)
{
uint8_t data[4] = {0};
ena_storage_read(address, (uint8_t *)&data, 4);
uint32_t result = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
return result;
}
void ena_storage_write_u8(size_t address, uint8_t byte)
{
uint8_t data[1] = {byte};
ena_storage_write(address, data, 1);
}
void ena_storage_write_u32(size_t address, uint32_t value)
{
uint8_t *data = malloc(4);
data[0] = (value & 0x000000ff);
data[1] = (value & 0x0000ff00) >> 8;
data[2] = (value & 0x00ff0000) >> 16;
data[3] = (value & 0xff000000) >> 24;
ena_storage_write(address, data, 4);
free(data);
}
int ena_storage_read_int(size_t address)
{
uint8_t data[sizeof(int)] = {0};
ena_storage_read(address, (uint8_t *)&data, sizeof(int));
int result = 0;
memcpy((int *)&result, (int *)&data, sizeof(int));
return result;
}
void ena_storage_write_int(size_t address, int value)
{
uint8_t data[sizeof(int)] = {0};
memcpy((int *)&data, (int *)&value, sizeof(int));
ena_storage_write(address, data, sizeof(int));
}
void ena_storage_erase(void)
{
ESP_LOGD(ENA_STORAGE_LOG, "START ena_storage_erase");
const esp_partition_t *partition = esp_partition_find_first(
ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, PARTITION_NAME);
assert(partition);
ESP_ERROR_CHECK(esp_partition_erase_range(partition, 0, partition->size));
ESP_LOGI(PARTITION_NAME, "erase partition!");
uint8_t *tek_zeros = calloc(ENA_STORAGE_TEK_LENGTH + 1, sizeof(uint8_t));
ena_storage_write(ENA_STORAGE_TEK_COUNT_ADDRESS, tek_zeros, ENA_STORAGE_TEK_LENGTH + 1);
uint8_t *temp_detection_zeros = calloc(ENA_STORAGE_DETECTION_LENGTH + 4, sizeof(uint8_t));
ena_storage_write(ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS, temp_detection_zeros, ENA_STORAGE_DETECTION_LENGTH + 4);
uint8_t *detection_zeros = calloc(ENA_STORAGE_DETECTION_LENGTH + 4, sizeof(uint8_t));
ena_storage_write(ENA_STORAGE_DETECTIONS_COUNT_ADDRESS, detection_zeros, ENA_STORAGE_DETECTION_LENGTH + 4);
ESP_LOGD(ENA_STORAGE_LOG, "END ena_storage_erase");
}
void ena_storage_dump_hash_array(uint8_t data[], size_t size)
{
for (int i = 0; i < size; i++)
{
if (i == 0)
{
printf("%0x", data[i]);
}
else
{
printf(" %0x", data[i]);
}
}
}
void ena_storage_dump_tek(void)
{
uint32_t timestamp;
uint8_t tek[ENA_KEY_LENGTH] = {0};
uint8_t tek_count = ena_storage_read_u8(ENA_STORAGE_TEK_COUNT_ADDRESS);
ESP_LOGD(ENA_STORAGE_LOG, "%u TEKs\n", tek_count);
printf("#,enin,tek\n");
for (int i = 0; i < tek_count; i++)
{
size_t address = ENA_STORAGE_TEK_START_ADDRESS + i * ENA_STORAGE_TEK_LENGTH;
timestamp = ena_storage_read_u32(address);
ena_storage_read(address + 4, tek, ENA_KEY_LENGTH);
printf("%d,%u,", i, timestamp);
ena_storage_dump_hash_array(tek, ENA_KEY_LENGTH);
printf("\n");
}
}
void ena_storage_dump_temp_detections(void)
{
uint32_t timestamp;
uint8_t rpi[ENA_KEY_LENGTH] = {0};
uint8_t aem[ENA_AEM_METADATA_LENGTH] = {0};
int rssi;
uint32_t detection_count = ena_storage_read_u32(ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS);
ESP_LOGD(ENA_STORAGE_LOG, "%u temporary detections\n", detection_count);
printf("#,timestamp,rpi,aem,rssi\n");
for (int i = 0; i < detection_count; i++)
{
ena_storage_read_temp_detection(i, &timestamp, rpi, aem, &rssi);
printf("%d,%u,", i, timestamp);
ena_storage_dump_hash_array(rpi, ENA_KEY_LENGTH);
printf(",");
ena_storage_dump_hash_array(aem, ENA_AEM_METADATA_LENGTH);
printf(",%d\n", rssi);
}
}
void ena_storage_dump_detections(void)
{
uint32_t enin;
uint8_t rpi[ENA_KEY_LENGTH] = {0};
uint8_t aem[ENA_AEM_METADATA_LENGTH] = {0};
int rssi;
uint32_t detection_count = ena_storage_read_u32(ENA_STORAGE_DETECTIONS_COUNT_ADDRESS);
ESP_LOGD(ENA_STORAGE_LOG, "%u detections\n", detection_count);
printf("#,enin,rpi,aem,rssi\n");
for (int i = 0; i < detection_count; i++)
{
ena_storage_read_detection(i, &enin, rpi, aem, &rssi);
printf("%d,%u,", i, enin);
ena_storage_dump_hash_array(rpi, ENA_KEY_LENGTH);
printf(",");
ena_storage_dump_hash_array(aem, ENA_AEM_METADATA_LENGTH);
printf(",%d\n", rssi);
}
}

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#ifndef _ena_STORAGE_H_
#define _ena_STORAGE_H_
#include "ena-crypto.h"
#define ENA_STORAGE_LOG "ESP-ENA-storage" // TAG for Logging
#define PARTITION_NAME "ena"
#define ENA_STOARGE_TEK_STORE_PERIOD (14) // Period of storing TEKs
#define ENA_STORAGE_TEK_COUNT_ADDRESS (0) // starting address for TEK COUNT
#define ENA_STORAGE_TEK_START_ADDRESS (ENA_STORAGE_TEK_COUNT_ADDRESS + 1) // starting address for TEKs
#define ENA_STORAGE_TEK_LENGTH (ENA_KEY_LENGTH + 4) // length of a stored TEK -> TEK keysize + 4 Bytes for ENIN
#define ENA_STORAGE_DETECTION_LENGTH (ENA_KEY_LENGTH + ENA_AEM_METADATA_LENGTH + 4 + sizeof(int)) // length of a stored detection -> RPI keysize + AEM size + 4 Bytes for ENIN + 4 Bytes for RSSI
#define ENA_STOARGE_TEMP_DETECTIONS_MAX (1000) // Maximum number of temporary stored detections
#define ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS (ENA_STORAGE_TEK_START_ADDRESS + ENA_STORAGE_TEK_LENGTH * ENA_STOARGE_TEK_STORE_PERIOD) // starting address for temporary detections COUNT (offset from max. stored TEKs)
#define ENA_STORAGE_TEMP_DETECTIONS_START_ADDRESS (ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS + 4) // starting address for temporary detections
#define ENA_STORAGE_DETECTIONS_COUNT_ADDRESS (ENA_STORAGE_TEMP_DETECTIONS_COUNT_ADDRESS + ENA_STORAGE_DETECTION_LENGTH * ENA_STOARGE_TEMP_DETECTIONS_MAX) // starting address for detections COUNT (offset from max. stored temporary detections)
#define ENA_STORAGE_DETECTIONS_START_ADDRESS (ENA_STORAGE_DETECTIONS_COUNT_ADDRESS + 4) // starting address of detections
/**
* read bytes at given address
*/
void ena_storage_read(size_t address, uint8_t *data, size_t size);
/**
* store bytes at given address
*/
void ena_storage_write(size_t address, uint8_t data[], size_t size);
/**
* deletes bytes at given address and shift other data back
*/
void ena_storage_shift_delete(size_t address, size_t size);
/**
* store TEK with ENIN
*/
void ena_storage_write_tek(uint32_t enin, uint8_t tek[]);
/**
* get last stored ENIN
*/
uint32_t ena_storage_read_enin(void);
/**
* get last stored TEK
*/
void ena_storage_read_tek(uint8_t tek[]);
/**
* get number of stored temporary detections
*/
uint32_t ena_storage_temp_detections_count(void);
/**
* store temporary detection (RPI + AEM + RSSI with UNIX timestamp)
*
* returns index
*/
uint32_t ena_storage_write_temp_detection(uint32_t timestamp, uint8_t rpi[], uint8_t aem[], int rssi);
/**
* get temporary detection (RPI + AEM + RSSI with UNIX timestamp) at given index
*/
void ena_storage_read_temp_detection(uint32_t index, uint32_t *timestamp, uint8_t rpi[], uint8_t aem[], int *rssi);
/**
* remove temporary detection at given index
*/
void ena_storage_remove_temp_detection(uint32_t index);
/**
* get number of stored detections
*/
uint32_t ena_storage_detections_count(void);
/**
* store detection (RPI + AEM + RSSI with ENIN)
*/
void ena_storage_write_detection(uint32_t timestamp, uint8_t rpi[], uint8_t aem[], int rssi);
/**
* get detection (RPI + AEM + RSSI with ENIN) at given index
*/
void ena_storage_read_detection(uint32_t index, uint32_t *enin, uint8_t rpi[], uint8_t aem[], int *rssi);
uint8_t ena_storage_read_u8(size_t address);
uint32_t ena_storage_read_u32(size_t address);
void ena_storage_write_u8(size_t address, uint8_t byte);
void ena_storage_write_u32(size_t address, uint32_t value);
int ena_storage_read_int(size_t address);
void ena_storage_write_int(size_t address, int value);
void ena_storage_erase(void);
void ena_storage_dump_tek(void);
void ena_storage_dump_temp_detections(void);
void ena_storage_dump_detections(void);
#endif

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#include <stdio.h>
#include <time.h>
#include "esp_system.h"
#include "esp_log.h"
#include "esp_bt.h"
#include "esp_bt_main.h"
#include "esp_gap_ble_api.h"
#include "nvs_flash.h"
#include "ena-crypto.h"
#include "ena-storage.h"
#include "ena-bluetooth-scan.h"
#include "ena-bluetooth-advertise.h"
#include "ena.h"
static uint32_t last_enin; // last ENIN
static uint8_t tek[ENA_KEY_LENGTH] = {0}; // current TEK
void ena_init(void)
{
// init NVS for BLE
esp_err_t ret;
ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
{
ESP_ERROR_CHECK(nvs_flash_erase());
ESP_ERROR_CHECK(nvs_flash_init());
}
// init BLE
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_bt_controller_init(&bt_cfg));
ESP_ERROR_CHECK(esp_bt_controller_enable(ESP_BT_MODE_BLE));
ESP_ERROR_CHECK(esp_bluedroid_init());
ESP_ERROR_CHECK(esp_bluedroid_enable());
ESP_ERROR_CHECK(esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_DEFAULT, ESP_PWR_LVL_P9));
ESP_ERROR_CHECK(esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_ADV, ESP_PWR_LVL_P9));
ESP_ERROR_CHECK(esp_ble_tx_power_set(ESP_BLE_PWR_TYPE_SCAN, ESP_PWR_LVL_P9));
ESP_ERROR_CHECK(esp_ble_gap_config_local_privacy(true));
/* nesseccary?
// new bluetooth address
uint8_t bt_address[ESP_BD_ADDR_LEN];
esp_fill_random(bt_address, ESP_BD_ADDR_LEN);
bt_address[0] |= 0xC0;
ESP_ERROR_CHECK(esp_ble_gap_set_rand_addr(bt_address));
*/
// init ENA
ena_crypto_init();
uint32_t current_enin = ena_crypto_enin((uint32_t)time(NULL));
last_enin = ena_storage_read_enin();
// read last TEK or create new
if (ena_storage_read_u8(ENA_STORAGE_TEK_COUNT_ADDRESS) > 0 && (current_enin - last_enin) < ENA_TEK_ROLLING_PERIOD)
{
ena_storage_read_tek(tek);
}
else
{
ena_crypto_tek(tek);
ena_storage_write_tek(ena_crypto_enin((uint32_t)time(NULL)), tek);
last_enin = ena_storage_read_enin();
}
// init scan
ena_bluetooth_scan_init();
// init and start advertising
ena_bluetooth_advertise_set_payload(current_enin, tek);
ena_bluetooth_advertise_start();
// initial scan on every start
ena_bluetooth_scan_start(ENA_SCANNING_TIME);
}
void ena_run(void)
{
uint32_t unix_timestamp = (uint32_t)time(NULL);
uint32_t current_enin = ena_crypto_enin(unix_timestamp);
if (current_enin - last_enin >= ENA_TEK_ROLLING_PERIOD)
{
ena_crypto_tek(tek);
ena_storage_write_tek(current_enin, tek);
last_enin = current_enin;
}
// change RPI
if (unix_timestamp % ENA_TIME_WINDOW == 0)
{
//
if (ena_bluetooth_scan_get_status() == ENA_SCAN_STATUS_SCANNING)
{
ena_bluetooth_scan_stop();
}
ena_bluetooth_advertise_stop();
ena_bluetooth_advertise_set_payload(current_enin, tek);
ena_bluetooth_advertise_start();
if (ena_bluetooth_scan_get_status() == ENA_SCAN_STATUS_WAITING)
{
ena_bluetooth_scan_start(ENA_SCANNING_TIME);
}
}
// scan
if (unix_timestamp % ENA_SCANNING_INTERVAL == 0 && ena_bluetooth_scan_get_status() == ENA_SCAN_STATUS_NOT_SCANNING)
{
ena_bluetooth_scan_start(ENA_SCANNING_TIME);
}
}

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/**
* combine bluetooth and crypto parts to build EXPOSURE NOTIFICATION
*
*/
#ifndef _ena_H_
#define _ena_H_
#define ENA_LOG "ESP-ENA" // TAG for Logging
void ena_init(void);
void ena_run(void);
#endif

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/**
* provide bluetooth part of Exposure Notification API v1.2 as defined by Apple/Google
*
* Source documents:
*
* https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
*
* https://covid19-static.cdn-apple.com/applications/covid19/current/static/detection-tracing/pdf/ExposureNotification-BluetoothSpecificationv1.2.pdf
*
*
*
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include <time.h>
#include <sys/time.h>
#include "esp_system.h"
#include "esp_log.h"
#include "ena.h"
#include "ena-storage.h"
#include "sdkconfig.h"
void app_main(void)
{
// DEBUG set time
struct timeval tv = {1594459800, 0}; // current hardcoded timestamp (2020-07-11 09:30:00) ¯\_(ツ)_/¯
settimeofday(&tv, NULL);
esp_log_level_set(ENA_STORAGE_LOG, ESP_LOG_INFO);
// ena_storage_erase();
ena_init();
// one second loop enough?
while (1)
{
ena_run();
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
}

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# ESP-IDF Partition Table
# Name, Type, SubType, Offset, Size, Flags
nvs, data, nvs, 0x9000, 0x6000,
phy_init, data, phy, 0xf000, 0x1000,
factory, app, factory, 0x10000, 1M,
ena, data, nvs, 0x110000,0x2C0000,
1 # ESP-IDF Partition Table
2 # Name, Type, SubType, Offset, Size, Flags
3 nvs, data, nvs, 0x9000, 0x6000,
4 phy_init, data, phy, 0xf000, 0x1000,
5 factory, app, factory, 0x10000, 1M,
6 ena, data, nvs, 0x110000,0x2C0000,