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    <p>Well I solved the issue.</p> <p>It turns out I was sending in the message data the <code>chunkLength</code> of the encrypted chunk data. So for every chunk I sent, even though I decrypted and wrote the correct filedata, I was advancing the stream position by the length of the encrypted data. This means every time I decrypted, when transferring more than 1 chunk(this is why the small files of only 1 chunk size didn't have problems) I was adding 16 bytes to the file size.</p> <p>People helping me probably wouldn't have been able to figure this out, because I didn't include all of the data in the client side or the server side to see this. But thankfully I managed to answer it myself.</p> <p>On the sender side, I was creating my FileMessage like this.</p> <pre><code> FileMessage message = new FileMessage(); message.FileMetaData = new FileMetaData(chunkedFile.MoreChunks, chunkedFile.ChunkLength, chunkedFile.CurrentPosition, iv); message.ChunkData = new MemoryStream(buffer); </code></pre> <p>If you see the second parameter of <code>FileMetaData</code> constructor, I'm passing in <code>chunkedFile.ChunkLength</code> which is supposed to be the length of the chunk. I was doing this on the encrypted chunk data, which resulted in sending the incorrect chunk length.</p> <p>The client on the other hand, was receiving this extra information. If you look near the end, you'll see the code <code>filePosition += message.FileMetaData.ChunkLength;</code>. I was using that erroneous <code>chunkLength</code> to advance the file position. It turns out that setting of the streamPosition was not even necessary.</p> <pre><code>using (BinaryWriter writer = new BinaryWriter(File.OpenWrite(fileWritePath))) { writer.BaseStream.SetLength(0); while (moreChunks) { FileMessage message = hostChannel.ReceiveFile(); moreChunks = message.FileMetaData.MoreChunks; UpdateTotalBytesTransferred(message); writer.BaseStream.Position = filePosition; byte[] decryptedStream; // Copy the message stream out to a memory stream so we can work on it afterwards. using (var memoryStream = new MemoryStream()) { message.ChunkData.CopyTo(memoryStream); Debug.WriteLine("Received Encrypted buffer Length: " + memoryStream.Length); decryptedStream = cryptor.Decrypt(memoryStream.ToArray(), symmetricPrivateKey, message.FileMetaData.InitializationVector); Debug.WriteLine("Received Decrypted buffer Length: " + decryptedStream.Length); } writer.Write(decryptedStream); TotalBytesTransferred = message.FileMetaData.FilePosition; filePosition += message.FileMetaData.ChunkLength; } OnTransferComplete(this, EventArgs.Empty); StopSession(); } </code></pre> <p><strong>Such a simple bug, but one that wasn't leaping out at me quickly at all.</strong></p>
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