private static void EncryptFileRawData(string filePath)
{
var settings = MetadataAssetSettings.Load();
var rawData = File.ReadAllBytes(filePath);
var dataEncryptionFlag = BitConverter.GetBytes(settings.DataEncryptionAndDecryption);
using var writer = new BinaryWriter(new MemoryStream());
// Write flag to judge if data need to decryption
writer.Write(dataEncryptionFlag);
if (settings.DataEncryptionAndDecryption)
{
// Write key and cipher data
var key = CryptoUtility.GenerateRandomKey(MetadataManager.EncryptionKeyLength);
var cipherData = CryptoUtility.AesEncrypt(rawData, key);
writer.Write(key);
writer.Write(cipherData);
}
else
{
// Write raw data
writer.Write(rawData);
}
var bufferData = ((MemoryStream)writer.BaseStream).GetBuffer();
File.WriteAllBytes(filePath, bufferData);
}