/// <summary>
/// Gets keys for the serial file, or decendant.
/// </summary>
/// <param name="SerialFile">SerialFile reference, or decendant.</param>
/// <param name="Provider">Provider of encryption keys.</param>
protected static async Task GetKeys(SerialFile SerialFile, FilesProvider Provider)
{
if (SerialFile.encrypted)
{
SerialFile.aes = Aes.Create();
SerialFile.aes.BlockSize = 128;
SerialFile.aes.KeySize = 256;
SerialFile.aes.Mode = CipherMode.CBC;
SerialFile.aes.Padding = PaddingMode.None;
KeyValuePair <byte[], byte[]> P = await Provider.GetKeys(SerialFile.fileName, SerialFile.fileExists);
SerialFile.aesKey = P.Key;
SerialFile.ivSeed = P.Value;
SerialFile.ivSeedLen = SerialFile.ivSeed.Length;
}
}