NCM constructor
NCM()
Implementation
NCM() {
_iv = IV.fromLength(0);
_coreCryptor = Encrypter(AES(Key.fromUtf8(coreKeyStr), mode: AESMode.ecb));
_metaCryptor =
Encrypter(AES(Key.fromUtf8(hexParse(metaKeyHex)), mode: AESMode.ecb));
}