Addded README

Code cleanup

lib/auth/vnc_auth.py

@@ -0,0 +1,45 @@
+from time import sleep
+from struct import *
+from pyDes import *
+import os
+from lib import log
+
+class VNCAuth():
+
+    def __init__(self):
+        self.getbuff = lambda _: None
+
+    def _mirrorBits(self, key):
+        newkey = []
+        for ki in range(len(key)):
+            bsrc = key[ki]
+            btgt = 0
+            for i in range(8):
+                if ord(bsrc) & (1 << i):
+                    btgt = btgt | (1 << 7-i)
+            newkey.append(btgt)
+        
+        return newkey
+
+    def auth(self, sock, password):
+        # el cliente encripta el challenge con la contraseña ingresada como key
+        pw = (password + '\0' * 8)[:8]
+        challenge = os.urandom(16)  # challenge
+        sock.send(challenge)    # send challenge
+        # obtener desde el cliente el dato encritado
+        data = self.getbuff(30)
+        # la encriptacion de challenge, con pw como key debe dar data
+        
+        k = des(self._mirrorBits(pw))
+        crypted = k.encrypt(challenge)
+
+        if data == crypted:
+            # Handshake successful
+            sock.send(pack("!I", 0))
+            log.debug(__name__, "Auth OK")
+            return True
+        else:
+            log.debug(__name__, "Invalid auth")
+            sleep(3)
+            sock.send(pack("!I", 1))
+            return False