encryptBytes method

@override Future<Uint8List> encryptBytes({ required Uint8List plainBytes, required String key, String? iv, })

Encrypts plainBytes and returns [16-byte IV][ciphertext].

When iv is provided it is used as the IV; otherwise a random IV is generated. The IV is always prepended to the returned bytes so that decryptBytes can reconstruct it without out-of-band information.

Implementation

@override
Future<Uint8List> encryptBytes({
  required Uint8List plainBytes,
  required String key,
  String? iv,
}) async {
  final keyBytes = prepareKey(key);
  final ivBytes = iv != null ? prepareIv(iv) : randomIv();
  final ciphertext = await _crypto.encryptBytes(plainBytes, keyBytes, ivBytes);
  // Prepend the 16-byte IV — identical to the native file format.
  final output = Uint8List(16 + ciphertext.length);
  output.setRange(0, 16, ivBytes);
  output.setRange(16, output.length, ciphertext);
  return output;
}