Kip

Hi

I'm trying to do some basic encryption on NP2 using XTEA.

I'm using the well-tested Bouncy Castle lib, so imported the necessary source files in my project:

• CryptoException.cs
• DataLengthException.cs
• IBlockCipher.cs
• ICipherParameters.cs
• KeyParameter.cs
• Pack.cs
• XTEAEngine.cs

then I tried it, by encoding and decoding a block of 8 bytes, using this code:

byte[] keyData = Encoding.UTF8.GetBytes("passwordpassword");

byte[] plainData = Encoding.UTF8.GetBytes("xteaxtea");
XteaEngine xteaEngine = new XteaEngine();
xteaEngine.Init(true, new KeyParameter(keyData));

byte[] outData = new byte[plainData.Length];

xteaEngine.ProcessBlock(plainData, 0, outData, 0);

XteaEngine decEngine = new XteaEngine();
decEngine.Init(false, new KeyParameter(keyData));
byte[] decData = new byte[plainData.Length];
xteaEngine.ProcessBlock(outData, 0, decData, 0);

string str = new string(Encoding.UTF8.GetChars(decData));
Debug.Print(str);

but plainData != decData, even if they should have the same data! What am I doing wrong? :\

Hi to all! This is my first post on this forum

I have a few issues with my NP2 (fw 4.3 beta 1), first of all... often I get the "Unable to communicate with USB:Netduino" error, which I can only solve by reflashing the firmware... any clues?

(by the way, is source for v4.3 beta available? I'm having troubles recompiling 4.2.2.2)

The second problem is with storage: I have to store 32 bytes of data on chip, and I read you can't use ExtendedWeakReference... is it true?

Third: is there a way to use unsafe code? I read on the forum that you actually can, but everytime I try to use it, netduino just hangs and I have to reflash the firmware :

Fourth: every STM32F40 has a 96 bit unique ID, is it exposed somewhere?

The last 3 problems can be solved by compiling my own custom firmware, but I don't really want to install VS 2010, so I should just wait for v4.3 to come out and work on that firmware :

Sorry for the long post