ESP32; Disable saving wifi credentials in nvs
Posted: Sat Aug 07, 2021 12:18 pm
I encrypted my ssid & password (hard coded). When I read whole flash by esptool.py read_flash command, I can find the credentials in the flash file as a plaintext. I want to protect my wifi ssid & password. Any solution?
Code: Select all
#include <WiFi.h>
#include "mbedtls/aes.h"
char ssid[17], pass[17];
const char key[17] = "1234567890abcdef";
void aes_decrypt(char *chipherText, char *key, char *outputBuffer)
{
mbedtls_aes_context aes;
mbedtls_aes_init(&aes);
mbedtls_aes_setkey_dec(&aes, (const unsigned char *)key, strlen(key) * 8);
mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_DECRYPT, (const unsigned char *)chipherText, (unsigned char *)outputBuffer);
mbedtls_aes_free(&aes);
}
void setup()
{
Serial.begin(115200);
Serial.println("\nApp starts");
char enc_ssid[33] = {0xEE, 0xBC, 0xEA, 0x5D, 0xD1, 0x74, 0xF9, 0x00, 0x8C, 0xCD, 0x83, 0xB5, 0xBA, 0xAB, 0xBC, 0x7D};
char enc_pass[33] = {0x49, 0x5B, 0x89, 0xFB, 0xE0, 0x8C, 0xE8, 0x6A, 0xC8, 0xFE, 0x40, 0x30, 0x06, 0x68, 0x6B, 0x56};
aes_decrypt(enc_ssid, (char *)key, ssid);
aes_decrypt(enc_pass, (char *)key, pass);
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println(" CONNECTED");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
}
void loop()
{
}