aggregator recieved messages decryption

.gitignore

@@ -1 +1,2 @@
 cybergarden-sensor/.vscode
+cybergarden-aggregator/.vscode

cybergarden-aggregator/lib/TransmissionModule/TransmissionModule.cpp

@@ -8,7 +8,33 @@
 #define ECC_LENGTH 4
 #define TOTAL_LENGTH (MSG_LENGTH + ECC_LENGTH)
 
-bool TransmissionModule::receive(uint8_t &sensor_id, MeasureData &data) {
+void TransmissionModule::decrypt(uint8_t *data, size_t data_size, uint8_t *output_data)
+{
+    size_t posn, len, inc = 5;
+    cipher->clear();
+    cipher->setKey(encryptionKey, key_size);
+    cipher->setIV(iv, iv_size);
+    memset(buffer, 0xBA, sizeof(buffer));
+
+    for (posn = 0; posn < auth_size; posn += inc) {
+        len = auth_size - posn;
+        if (len > inc)
+            len = inc;
+        cipher->addAuthData(authdata + posn, len);
+    }
+
+    for (posn = 0; posn < data_size; posn += inc) {
+        len = data_size - posn;
+        if (len > inc)
+            len = inc;
+        cipher->decrypt(buffer + posn, data + posn, len);
+    }
+
+    memcpy(output_data, buffer, data_size);
+}
+
+bool TransmissionModule::receive(uint8_t &sensor_id, MeasureData &data)
+{
     uint8_t buf[TOTAL_LENGTH];
     if (!transmitterModule->receive(buf, TOTAL_LENGTH)) {
         return false;

cybergarden-aggregator/lib/TransmissionModule/TransmissionModule.h

@@ -1,17 +1,39 @@
+#ifndef KEMPT_KINKAJOU_TRANSMISSIONMODULE_H
+#define KEMPT_KINKAJOU_TRANSMISSIONMODULE_H
+
 #include <Arduino.h>
+#include <Crypto.h>
+#include <ChaChaPoly.h>
 #include "MeasureData.h"
 #include "TransmitterModule.h"
 #include "ReedSolomonModule.h"
 
-#ifndef KEMPT_KINKAJOU_TRANSMISSIONMODULE_H
-#define KEMPT_KINKAJOU_TRANSMISSIONMODULE_H
+#define MAX_PLAINTEXT_LEN 265
 
 class TransmissionModule {
 private:
     TransmitterModule * transmitterModule;
     ReedSolomonModule * reedSolomonModule;
+    ChaChaPoly* cipher;
+    uint8_t encryptionKey[16] = {0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+                    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f};
+    uint8_t authdata[16] = {0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3,
+                    0xc4, 0xc5, 0xc6, 0xc7};
+
+    uint8_t iv[16] = {0x07, 0x00, 0x00, 0x00, 0x40, 0x41, 0x42, 0x43,
+                    0x44, 0x45, 0x46, 0x47};
+    uint8_t buffer[MAX_PLAINTEXT_LEN];
+    size_t key_size = 16;
+    size_t auth_size = 12;
+    // size_t data_size = 4;
+    size_t iv_size = 12;  
 public:
-    TransmissionModule(TransmitterModule &transmitterModule, ReedSolomonModule &reedSolomonModule) : transmitterModule(&transmitterModule), reedSolomonModule(&reedSolomonModule) {}
+    TransmissionModule(TransmitterModule &transmitterModule, ReedSolomonModule &reedSolomonModule) : 
+    transmitterModule(&transmitterModule), 
+    reedSolomonModule(&reedSolomonModule) {
+        cipher = new ChaChaPoly();
+    }
+    void decrypt(uint8_t * data, size_t data_size,  uint8_t* output_data);
     bool receive(uint8_t &sendor_id, MeasureData &data);
 };
 

cybergarden-aggregator/lib/TransmitterModule/TransmitterModule.h

@@ -1,12 +1,13 @@
 //
 // Created by o.likhogub on 10/7/2023.
 //
+#ifndef KEMPT_KINKAJOU_TRANSMITTERMODULE_H
+#define KEMPT_KINKAJOU_TRANSMITTERMODULE_H
 #include "Arduino.h"
 #include <RH_ASK.h>
 #include <SPI.h> 
 
-#ifndef KEMPT_KINKAJOU_TRANSMITTERMODULE_H
-#define KEMPT_KINKAJOU_TRANSMITTERMODULE_H
+
 
 class TransmitterModule {
 private:

cybergarden-aggregator/lib/UuidModule/Uuid.cpp

@@ -8,7 +8,7 @@
 //          https://en.wikipedia.org/wiki/Universally_unique_identifier
 
 
-#include "UUID.h"
+#include "Uuid.h"
 
 
 UUID::UUID()

cybergarden-aggregator/platformio.ini

@@ -16,3 +16,4 @@ monitor_speed = 115200
 lib_deps = 
 	mikem/RadioHead@^1.120
 	bblanchon/ArduinoJson@^6.21.3
+	rweather/Crypto@^0.4.0