decryptBytes abstract method
Decrypts cipherBytes (format: [16-byte IV][ciphertext]) and returns
the original plaintext.
When iv is provided it is used as the IV and the first 16 bytes of
cipherBytes are still skipped (they were written by encryptBytes).
Implementation
Future<Uint8List> decryptBytes({required Uint8List cipherBytes, required String key, String? iv});