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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
cooperation with the community in the case of network server software.
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,