#include "mbedtls/aes.h"
 
void setup() {
 
  Serial.begin(115200);
 
  mbedtls_aes_context aes;
 
  char * key = "abcdefghijklmnop";
 
  unsigned char encrypted[] = {0x56, 0x7a, 0x3b, 0x23, 0xb6, 0x83, 0xd8, 0x48, 0x8d, 0x5d, 0x40, 0xd2, 0xa5, 0x6e, 0x31, 0xd2};
  unsigned char decrypted[16];
 
  mbedtls_aes_init( &aes );
  mbedtls_aes_setkey_dec( &aes, (const unsigned char*) key, strlen(key) * 8 ); // Set decryption key

  // Decrypt the first block
  mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_DECRYPT, encrypted, decrypted);
  Serial.println("Decrypted block 1:");
  for (int i = 0; i < 16; i++) {
    Serial.print((char)decrypted[i]);
  }
  Serial.println();

  // Decrypt the second block
  mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_DECRYPT, encrypted + 16, decrypted);
  Serial.println("Decrypted block 2:");
  for (int i = 0; i < 16; i++) {
    Serial.print((char)decrypted[i]);
  }
  Serial.println();

  mbedtls_aes_free( &aes );
}
 
void loop() {}