//https://github.com/Industrial-Shields/arduino-AES_CMAC
// AES_CMAC library example
// by Industrial Shields

//https://github.com/Industrial-Shields/arduino-AES_CMAC
#include <AES_CMAC.h>

// Required AES.h from arduino Crypto library https://www.arduino.cc/reference/en/libraries/crypto/
#include <AES.h>

// Key and data from https://tools.ietf.org/html/rfc4493#section-4
const uint8_t key[16] = {
  0x2b, 0x7e, 0x15, 0x16,
  0x28, 0xae, 0xd2, 0xa6,
  0xab, 0xf7, 0x15, 0x88,
  0x09, 0xcf, 0x4f, 0x3c,
};
const uint8_t data_raw[] = {
  0x6b, 0xc1, 0xbe, 0xe2,
  0x2e, 0x40, 0x9f, 0x96,
  0xe9, 0x3d, 0x7e, 0x11,
  0x73, 0x93, 0x17, 0x2a,
  0xae, 0x2d, 0x8a, 0x57,
  0x1e, 0x03, 0xac, 0x9c,
  0x9e, 0xb7, 0x6f, 0xac,
  0x45, 0xaf, 0x8e, 0x51,
  0x30, 0xc8, 0x1c, 0x46,
  0xa3, 0x5c, 0xe4, 0x11,
};

// The output
uint8_t mac[16];

AESTiny128 aes128;
AES_CMAC cmac(aes128);

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

  // Generate the MAC from data_raw, using the key. The result is stored into mac
  cmac.generateMAC(mac, key, data_raw, sizeof(data_raw));

  // Print the result
  Serial.print("MAC: ");
  for (int i = 0; i < sizeof(mac); ++i) {
    if (mac[i] < 0x10) {
      Serial.print('0');
    }
    Serial.print(mac[i], HEX);
    Serial.print(' ');
  }
  Serial.println();
}

////////////////////////////////////////////////////////////////////////////////////////////////////
void loop() {
  // Nothing to do
}