Impossible to use list of signed int rather than being obliged to use Uint8List

[jvondermarck]

On the current implementation, I am stuck to convert all my signed list (so with negative values) to Uint8List (= unsigned list) to encrypt and decrypt (like with the KeyParameter, or ParametersWithIV, but also what returns the value when I call the method process).

Is there any other dart packages to be able to use List<int> or Int8List rather than Uint8List ? What should I do ?

Thank you so much.