private void init(ZWaveNode node)
{
//ZWaveNode node = null;
if (enc == null)
{
enc = new AES_work();
}
SetupNetworkKey(node);
}
private byte[] GenerateAuthentication(byte[] data, int start, int length, byte sendingNode, byte receivingNode, byte[] iv, AES_work enc)
{
// data should stat at 4
byte[] buffer = new byte[256];
byte[] tmpauth = new byte[16];
int ib = 0;
buffer[ib] = data[start + 0];
ib++; buffer[ib] = sendingNode;
ib++; buffer[ib] = receivingNode;
ib++; buffer[ib] = (byte)(length - 19);
Array.Copy(data, start + 9, buffer, 4, buffer[3]);
byte[] buff = new byte[length - 19 + 4];
Array.Copy(buffer, buff, length - 19 + 4);
// Utility.logMessage("Raw Auth (minus IV)" + Utility.ByteArrayToString(buff));
tmpauth = enc.ECB_EncryptMessage(authKey, iv);
byte[] encpck = new byte[16];
Array.Clear(encpck, 0, 16);
int block = 0;
for (int i = 0; i < buff.Length; i++)
{
encpck[block] = buff[i];
block++;
if (block == 16)
{
for (int j = 0; j < 16; j++)
{
tmpauth[j] = (byte)(encpck[j] ^ tmpauth[j]);
encpck[j] = 0;
}
block = 0;
tmpauth = enc.ECB_EncryptMessage(authKey, tmpauth);
}
}
/* any left over data that isn't a full block size*/
if (block > 0)
{
for (int i = 0; i < 16; i++)
{
tmpauth[i] = (byte)(encpck[i] ^ tmpauth[i]);
}
tmpauth = enc.ECB_EncryptMessage(authKey, tmpauth);
}
byte[] auth = new byte[8];
Array.Copy(tmpauth, auth, 8);
// Utility.logMessage("Computed Auth " + Utility.ByteArrayToString(auth));
return(auth);
}
