public void EncryptFileWithPadding(FST fst, string outputFilename, short contentID, int blockSize)
{
using FileStream output = new FileStream(outputFilename, FileMode.Create);
MemoryStream input = new MemoryStream(fst.GetAsData());
BigEndianMemoryStream ivStream = new BigEndianMemoryStream(0x10);
ivStream.WriteBigEndian(contentID);
IV iv = new IV(ivStream.GetBuffer());
EncryptSingleFile(input, output, fst.GetDataSize(), iv, blockSize);
}