update lcg: python3 integer division

sudo_root/crypto/lcg.py

@@ -1,41 +1,44 @@
 """Module to break Linear Congruential Generator"""
+
+
 class Lcg(object):
-
     """Create LCG with a state to generate some random value,
     or without state to break LCG with 3 consecutive known values.
-    
+
     Exemple:
-
-    from sudo_root.crypto import lcg
-
-    l = lcg.Lcg(multiplier, addend, mod, bits_hidden)
-    state = l.get_state(r0, r1, r2) # this are 3 consecutive output
-    l.next() give us the expected output
+
+    >>> from sudo_root.crypto import lcg
+    >>> l = lcg.Lcg(multiplier, addend, mod, bits_hidden)
+    >>> state = l.get_state(r0, r1, r2) # this are 3 consecutive output
+    >>> l.next() give us the expected output
     """
+
     def __init__(self, multiplier, addend, mod, bits_hidden, state=None):
         self.a = multiplier
         self.b = addend
         self.mod = mod
         self.hidder = 1 << bits_hidden
         self.state = state
-        
+
     def get_state(self, r0, r1, r2):
         "break the LCG with 3 consecutive output."
-        t = self.hidder * r1 - self.a * self.hidder * r0 - self.b + self.hidder - 1
+        t = self.hidder * r1 - self.a * self.hidder * \
+            r0 - self.b + self.hidder - 1
         t %= self.mod
-        
-        end = (self.hidder * self.a - 1 - t) / self.mod
-        for k in range(1,end):
+
+        end = (self.hidder * self.a - 1 - t) // self.mod
+        for k in range(1, end):
             h = t + self.mod * k
             if (h % self.a) < self.hidder:
-                state = h / self.a + self.hidder * r0
-                if ((state * self.a + self.b) % self.mod * self.a + self.b)% self.mod / self.hidder == r2:
+                state = h // self.a + self.hidder * r0
+                if ((state * self.a + self.b) % self.mod * self.a + self.b) \
+                        % self.mod // self.hidder == r2:
                     self.state = state
                     return self.state
-        return 0
-    
+        return self.state
+
     def next(self):
         "The next value of the LCG."
+        print('state {}'.format(self.state))
         self.state = (self.a * self.state + self.b) % self.mod
-        return self.state / self.hidder
-
+        return self.state // self.hidder