byte[] data = new byte[challenge.length + clientData.length];
System.arraycopy(challenge, 0, data, 0, challenge.length);
System.arraycopy(clientData, 0, data, challenge.length,
byte[] data = new byte[challenge.length + clientData.length];
System.arraycopy(challenge, 0, data, 0, challenge.length);
System.arraycopy(clientData, 0, data, challenge.length,