ndh_key_out.py

#!/usr/bin/python

import sys

def gates_out(in_str):
  if len(in_str) != 8:
    print "fuck"
    sys.exit(0)
  in_bin = [False,False,False,False,False,False,False,False]
  for i in range(0,len(in_str)):
    in_bin[i] = in_str[i] == '1'
  GATE_1_0 = not in_bin[2]
  GATE_1_1 = not in_bin[3]
  GATE_1_2 = not in_bin[4]
  GATE_1_3 = not in_bin[1]
  GATE_1_4 = not in_bin[5]
  GATE_1_5 = not in_bin[7]
  GATE_2_0 = GATE_1_0 and in_bin[0]
  GATE_2_1 = GATE_1_0 and GATE_1_3
  GATE_2_2 = in_bin[0] and in_bin[1]
  GATE_2_3 = in_bin[5] ^ in_bin[6]
  GATE_2_4 = GATE_1_3 ^ GATE_1_5
  GATE_3_0 = GATE_2_0 and GATE_1_1
  GATE_3_1 = GATE_1_1 and GATE_2_1
  GATE_3_2 = GATE_2_2 and GATE_1_1
  GATE_3_3 = GATE_1_4 and in_bin[2]
  GATE_3_4 = in_bin[2] and GATE_2_4
  GATE_4_0 = GATE_3_0 and GATE_1_2
  GATE_4_1 = GATE_1_2 and GATE_3_1
  GATE_4_2 = GATE_1_2 and GATE_3_2
  GATE_4_3 = GATE_3_3 and GATE_2_3
  GATE_5_0 = GATE_4_0 or GATE_4_1
  GATE_5_1 = GATE_4_2 or GATE_4_3
  GATE_6_0 = GATE_3_4 or GATE_5_1
  GATE_7_fin = GATE_5_0 or GATE_6_0
  if GATE_7_fin:
    return "1"
  else:
    return "0"

data = "010001110101111001100011011011100100100100111001010111100100011101000111001110010100011100111001010001110011100101000111001110010101111001100011011011100100100101101110010010010011100100110101010111100110001100111001001101010110111001001001011011100100100101000111010111100011100100110101011011100100100101011110011000110100011101011110001110010011010101011110011000110101111001100011010111100110001101000111010111100101111001100011011011100100100101000111010111100011100100110101010001110101111001101110010010010101111001100011010111100110001101101110010010010101111001100011010111100110001100111001001101010100011101011110010111100110001101011110011000110101111001100011010001110101111001000111010111100101111001100011011011100100100101101110010010010101111001100011"

import binascii

d = [data[i:i+8] for i in range(0,len(data),8)]
out_string = ""

for byte in d:
  out_string += gates_out(byte)

print "[+] out_string : %s" % out_string

n = int(out_string,2)
print binascii.unhexlify('%x' % n)