Log.txt

Encrypted to:
31FFFFFFC013FFFFFF8C774FFFFFFF86FFFFFF9D206C545E2669FFFFFFACFFFFFFC37300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 
OK!
Tag:
000000000000000031FFFFFFC013FFFFFF8C774FFFFFFF86FFFFFF9D206C545E2669FFFFFFACFFFFFFC3730000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 
OK!
Decrypted to:
{id: "12345678"}}? ����r���R����:T�c�1V_����5D0ɇQ�S�J��"�U���ڈ�0i��t,�]Tb[�^�w����J8��$`ې�X8��p@!�'�iB$:4�A�9�֌q������B���Bj�g8�\��ڏD�Y����7c���m�R�P����V��)�JW6�q_(\v.��!�I��,;���oO"�o��͓��4������T�e�i�ҫ�uF�fB�F�"���PE��<E�h 
OK!
Payload:
{id: "12345678"}1231212312345678012345678901234567890123456789019
�
��
*.'$6��Y>&85�A�	;	m2��	�
 Encrypted to:OK!Tag:Decrypted to:Payload:{id: "12345678"}}? ����r���R����:T�c��1V_��ɥ5D0��Q�S�J��"�U���ڈ�0i� 
OK!

Project.ino

#include "Crypto.h"
#include "ChaChaPoly.h"
#include <string.h>

#if (ESP8266)
#include <pgmspace.h>
#else
#include <avr/pgmspace.h>
#endif

#define MAX_PLAINTEXT_LEN 265

byte cipherBufferE[MAX_PLAINTEXT_LEN];
byte cipherBufferD[MAX_PLAINTEXT_LEN];

ChaChaPoly *cipher = new ChaChaPoly();

const uint8_t cipherKey[] = "01234567890123456789012345678901";
const uint8_t cipherIV[] = "12345678";
const uint8_t cipherAuth[] = "12312123";
uint8_t cipherTag[16];
const uint8_t payload[] = "{id: \"12345678\"}";

void setup() {
  Serial.begin(9600);

  cipher->clear();
  cipher->setKey(cipherKey, sizeof(cipherKey));
  cipher->setIV(cipherIV, sizeof(cipherIV));
  cipher->addAuthData(cipherAuth, sizeof(cipherAuth));
  cipher->encrypt(cipherBufferE, payload, sizeof(payload));

  Serial.println("Encrypted to:");
  printArray(cipherBufferE);
  Serial.println("OK!");

  Serial.println("Tag:");
  cipher->computeTag(cipherTag, sizeof(cipherTag));
  printArray(cipherTag);
  Serial.println("OK!");

  cipher->clear();
  cipher->setKey(cipherKey, sizeof(cipherKey));
  cipher->setIV(cipherIV, sizeof(cipherIV));
  cipher->addAuthData(cipherAuth, sizeof(cipherAuth));
  cipher->decrypt(cipherBufferD, cipherBufferE, sizeof(cipherBufferE));

  Serial.println("Decrypted to:");
  printArray2(cipherBufferD);
  Serial.println("OK!");

  Serial.println("Payload:");
  printArray2(payload);
  Serial.println("OK!");
}

void loop() {
  // put your main code here, to run repeatedly:

}

void printArray(const uint8_t data[]) {
  int sizeOfData = MAX_PLAINTEXT_LEN; //(sizeof(data)/sizeof(*data));

  /*
    Serial.println("Size:");
    Serial.println(sizeOfData);
    delay(100);
  */

  for (int i = 0; i < sizeOfData; i++) {
    Serial.print((char)data[i], HEX);
  }

  Serial.println(" ");
}

void printArray2(const uint8_t data[]) {
  int sizeOfData = MAX_PLAINTEXT_LEN; //(sizeof(data)/sizeof(*data));

  /*
    Serial.println("Size:");
    Serial.println(sizeOfData);
    delay(100);
  */

  for (int i = 0; i < sizeOfData; i++) {
    Serial.print((char)data[i]);
  }

  Serial.println(" ");
}