aesEncrypt function

Uint8List aesEncrypt(dynamic data, dynamic key)

Implementation

Uint8List aesEncrypt(data, key) {
  if (!(data is Uint8List) && !(data is String)) {
    throw "'data' must be a string or Uint8List";
  }

  if (!(key is Uint8List) && !(key is String)) {
    throw "'key' must be a string or Uint8List";
  }

  if (data is String) {
    if (isHex(data)) {
      data = hexToUint8List(data);
    } else {
      data = Uint8List.fromList(utf8.encode(data));
    }
  }

  if (key is String) {
    if (isHex(key)) {
      key = hexToUint8List(key);
    } else {
      throw "'key' must be an hexadecimal string";
    }
  }

  Uint8List aad = Uint8List.fromList(
      List<int>.generate(16, (i) => Random.secure().nextInt(256)));
  Uint8List iv = Uint8List.fromList(
      List<int>.generate(12, (i) => Random.secure().nextInt(256)));

  var encrypter = GCMBlockCipher(AESFastEngine());
  var params = AEADParameters(KeyParameter(key), 16 * 8, iv, aad);
  encrypter.init(true, params);
  var cipherText = encrypter.process(data);

  Uint8List result = concatUint8List([
    encrypter.nonce,
    encrypter.aad!,
    Uint8List.fromList(cipherText.sublist(0, 5))
  ]);
  return result;
}