#include "Openssl_crypto.h"
class SymmetricEncryptionBox {
  uint8_t iv[12];
  uint8_t symmetric_key[32]; // SHA256 used with ECDHE -> or AES whatever symmetric_key.
  // increments last 4 bytes (in big-endian order)
  uint32_t aes_gcm_increment_iv_internal_call(uint8_t* iv);
  public:
    SymmetricEncryptionBox();
    uint32_t set_symmetric_key(uint8_t* given_key);
    uint32_t encrypt_decrypt(int enc, uint8_t* plaintext, uint32_t plaintext_length, uint8_t* ciphertext, uint32_t* ciphertext_length, uint8_t* tag);
};