public static void DecryptTagFile(string source, string destination, byte[] key, OpCore core)
{
int bufferSize = 4096;
byte[] buffer = new byte[4096]; // needs to be 4k to packet stream break/resume work
string tempPath = (core != null) ? core.GetTempPath() : destination;
G2Protocol protocol = (core != null) ? core.Network.Protocol : new G2Protocol();
using (FileStream tempFile = new FileStream(tempPath, FileMode.Create))
using (TaggedStream encFile = new TaggedStream(source, protocol))
using (IVCryptoStream stream = IVCryptoStream.Load(encFile, key))
{
int read = bufferSize;
while (read == bufferSize)
{
read = stream.Read(buffer, 0, bufferSize);
tempFile.Write(buffer, 0, read);
}
}
// move to official path
if (core == null)
return;
File.Copy(tempPath, destination, true);
File.Delete(tempPath);
}
