emilr256 commented 4 years ago

Hello! I use an AES lib from this source on a Mega2560.

Have loaded an example code from a sketchbook for this library: ` / Minimalistic example for Readme /

include "AESLib.h"

AESLib aesLib;

String plaintext = "24051984";

char cleartext[256]; char ciphertext[512];

// AES Encryption Key byte aes_key[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7 };

// General initialization vector (you must use your own IV's in production for full security!!!) byte aes_iv[N_BLOCK] = { 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1 };

// Generate IV (once) void aes_init() { Serial.println("gen_iv()"); aesLib.gen_iv(aes_iv); // workaround for incorrect B64 functionality on first run... Serial.println("encrypt()"); Serial.println(encrypt(strdup(plaintext.c_str()), aes_iv)); }

String encrypt(char msg, byte iv[]) { int msgLen = strlen(msg); Serial.print("msglen = "); Serial.println(msgLen); char encrypted[4 msgLen]; // AHA! needs to be large, 2x is not enough aesLib.encrypt64(msg, encrypted, aes_key, iv); Serial.print("encrypted = "); Serial.println(encrypted); return String(encrypted); }

String decrypt(char * msg, byte iv[]) { unsigned long ms = micros(); int msgLen = strlen(msg); char decrypted[msgLen]; // half may be enough aesLib.decrypt64(msg, decrypted, aes_key, iv); return String(decrypted); }

void setup() { Serial.begin(230400); while (!Serial); // wait for serial port delay(2000); Serial.println("aes_init()"); aes_init();

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;

void loop() {

if (Serial.available() > 0) {

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
byte enc_iv[N_BLOCK] = { 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1 }; // iv_block gets written to, provide own fresh copy...
String encrypted = encrypt(cleartext, enc_iv);
sprintf(ciphertext, "%s", encrypted.c_str());
Serial.print("Ciphertext: ");
Serial.println(encrypted);

} } ` Only what i changed is the: text to encrypt to: 24051984 Key: 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7 IV: 7, 6, 5, 4, 3, 2, 1, 9, 8, 7, 6, 5, 4, 3, 2, 1 The rest of the code is the normal example from the sketchbook. I have try to decode the received base64 in my program that i make, but no success. Also, i tested the encoding/decoding with an online tool to encode . At a same page, i used to crate chain to decode with a revers procedure. If i use a web based encode i can later decode it on my program, but the Arduino encoded base64 not. Also, i can't decode with an online tool and with my offline tool the Arduino encoded base64.

The arduino code is example provided from the library autor to show an aes-base64 encoding, and i also don't see the fault. Can somebody show me what is wrong od correct the code, to be useful for sending an base64 encrypted aes ciphr that i can later descrypt with my keys and iv that i provided? Something is wrong, but i don't known what?