Hi everyone,
I want to encrypt a text in ESP32 via AESlib and send it to another device, flutter, or a website. But when I was decrypting this code, it would successfully be done but with the wrong value; I have tried to use online decryption websites like
The result was the same; moreover, I had the correct decryption in Arduino, and I am using one of the examples of the AESlib, which name is ESPserial.
Thanks
real text = "test"
website :
LImmD60OFOYo78VtMNrVKg==
key : 0000000000000000
export : dGVzdA==
serial monitor export :
INPUT:test
encrypted = LImmD60OFOYo78VtMNrVKg==
Ciphertext: LImmD60OFOYo78VtMNrVKg==
Cleartext: test
SUCCES
/* Medium example for ESP8266 (not for Arduino, uses additional Base64 layer) */
#include "AESLib.h"
AESLib aesLib;
String plaintext = "Test";
char cleartext[256];
char ciphertext[512];
// AES Encryption Key
byte aes_key[] = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30 };
// General initialization vector (you must use your own IV's in production for full security!!!)
byte aes_iv[N_BLOCK] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
String encrypt(char * msg, uint16_t msgLen, byte iv[]) {
int cipherlength = aesLib.get_cipher64_length(msgLen);
char encrypted[cipherlength]; // AHA! needs to be large, 2x is not enough
aesLib.encrypt64(msg, msgLen, encrypted, aes_key, sizeof(aes_key), iv);
Serial.print("encrypted = "); Serial.println(encrypted);
return String(encrypted);
}
String decrypt(char * msg, uint16_t msgLen, byte iv[]) {
char decrypted[msgLen];
aesLib.decrypt64(msg, msgLen, decrypted, aes_key, sizeof(aes_key), iv);
return String(decrypted);
}
// Generate IV (once)
void aes_init() {
Serial.println("gen_iv()");
aesLib.gen_iv(aes_iv);
Serial.println("encrypt()");
Serial.println(encrypt(strdup(plaintext.c_str()), plaintext.length(), aes_iv));
}
void setup() {
Serial.begin(9600);
while (!Serial); // wait for serial port
delay(2000);
aes_init();
aesLib.set_paddingmode(paddingMode::CMS);
//
// verify with https://cryptii.com
// previously: verify with https://gchq.github.io/CyberChef/#recipe=To_Base64('A-Za-z0-9%2B/%3D')
//
char b64in[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
char b64out[base64_enc_len(sizeof(aes_iv))];
base64_encode(b64out, b64in, 16);
char b64enc[base64_enc_len(10)];
base64_encode(b64enc, (char*) "0000000000", 10);
char b64dec[ base64_dec_len(b64enc, sizeof(b64enc))];
base64_decode(b64dec, b64enc, sizeof(b64enc));
Serial.println("Enter text to be encrypted into console (no feedback) and press ENTER (newline):");
}
/* non-blocking wait function */
void wait(unsigned long milliseconds) {
unsigned long timeout = millis() + milliseconds;
while (millis() < timeout) {
yield();
}
}
unsigned long loopcount = 0;
byte enc_iv[N_BLOCK] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // iv_block gets written to, provide own fresh copy...
byte dec_iv[N_BLOCK] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
void loop() {
if (Serial.available()) {
loopcount++; Serial.println(loopcount); // entry counter
String readBuffer = Serial.readStringUntil('\n');
Serial.println("INPUT:" + readBuffer);
sprintf(cleartext, "%s", readBuffer.c_str()); // must not exceed 255 bytes; may contain a newline
// Encrypt
uint16_t clen = String(cleartext).length();
String encrypted = encrypt(cleartext, clen, enc_iv);
sprintf(ciphertext, "%s", encrypted.c_str());
Serial.print("Ciphertext: ");
Serial.println(encrypted);
delay(1000);
// Decrypt
delay(1000);
uint16_t dlen = encrypted.length();
String decrypted = decrypt( ciphertext, dlen, dec_iv);
Serial.print("Cleartext: ");
Serial.println(decrypted);
if (decrypted.equals(cleartext)) {
Serial.println("SUCCES");
}
else
{
Serial.println("FAILURE");
}
for (int i = 0; i < 16; i++) {
enc_iv[i] = 0;
dec_iv[i] = 0;
}
}
}
