Proyecto: transmisión segura de datos a la nube

#include "mbedtls/aes.h"
#include "mbedtls/gcm.h"
#include "esp_system.h"
#include "esp_log.h"
#include 
#include 
#include 

// ==================== CONFIGURACIÓN DE SEGURIDAD ====================
static const char* TAG = "SECURE_CLOUD";
static const char* CLOUD_ENDPOINT = "https://api.industrial-iot.aws.com/data";

// Clave maestra AES-256 (EN PRODUCCIÓN: usar secure storage)
static const uint8_t MASTER_KEY[32] = {
    0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
    0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
    0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
    0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
};

// ==================== FUNCIONES DE CIFRADO ====================
esp_err_t encrypt_sensor_data(const sensor_data_t* sensor_data, 
                              encrypted_payload_t* encrypted_payload) {
    mbedtls_gcm_context gcm_ctx;
    int ret;
    
    mbedtls_gcm_init(&gcm_ctx);
    ret = mbedtls_gcm_setkey(&gcm_ctx, MBEDTLS_CIPHER_ID_AES, 
                             MASTER_KEY, 256);
    
    if (ret == 0) {
        // Generar IV único y realizar cifrado AES-GCM
        generate_random_iv(encrypted_payload->iv, 12);
        
        ret = mbedtls_gcm_crypt_and_tag(&gcm_ctx,
                                        MBEDTLS_GCM_ENCRYPT,
                                        sizeof(sensor_data_t),
                                        encrypted_payload->iv, 12,
                                        NULL, 0,
                                        (const unsigned char*)sensor_data,
                                        encrypted_payload->encrypted_data,
                                        16, encrypted_payload->tag);
    }
    
    mbedtls_gcm_free(&gcm_ctx);
    return (ret == 0) ? ESP_OK : ESP_FAIL;
}

void setup() {
    Serial.begin(115200);
    ESP_LOGI(TAG, "🔐 Sistema de Transmisión Segura v3.0");
    
    // Test de cifrado
    sensor_data_t test_data = {
        .temperature = 25.6,
        .vibration_x = 0.15,
        .timestamp = millis()
    };
    
    encrypted_payload_t encrypted;
    if (encrypt_sensor_data(&test_data, &encrypted) == ESP_OK) {
        ESP_LOGI(TAG, "✅ Cifrado AES-256-GCM exitoso");
        // Transmitir a la nube...
    }
}

void loop() {
    // Lectura continua de sensores y transmisión segura
    delay(30000);
}