public static IEnumerable <TunnelDataMessage> MakeFragments(IEnumerable <TunnelMessage> messages, I2PTunnelId desttunnel)
{
var padcalc = CalculatePadding(messages, desttunnel);
foreach (var one in padcalc.TDMessages)
{
//Logging.Log( "New message" );
var writer = new BufRefLen(one.TunnelDataInstance.Payload);
writer.Seek(24); // TunnelID, IV, Checksum of "Tunnel Message (Decrypted)"
if (one.PaddingNeeded > 0)
{
//Logging.Log( "Padding " + one.PaddingNeeded.ToString() + " bytes" );
writer.Write(new BufRefLen(BufUtils.RandomNZ(one.PaddingNeeded)));
}
writer.Write8(0); // The Zero
one.TunnelDataInstance.SetFirstDeliveryInstructionPoint(writer.View);
foreach (var frag in one.Fragments)
{
var fragstart = new BufRefLen(writer);
frag.Append(writer);
//Logging.Log( "Fragment " + ( one.TunnelDataInstance.Writer - fragstart ).ToString() + " bytes" );
}
one.TunnelDataInstance.Checksum.Poke(I2PHashSHA256.GetHash(
one.TunnelDataInstance.FirstDeliveryInstruction,
one.TunnelDataInstance.IV), 0, 4);
if (writer.Length != 0)
{
Logging.LogCritical("TunnelData: MakeFragments. Tunnel block is not filled!");
throw new Exception("TunnelData message not filled. Something is wrong.");
}
}
return(padcalc.TDMessages.Select(msg => msg.TunnelDataInstance));
}