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difference distribution table

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Oct 30th, 2015
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Python 2.73 KB | None | 0 0
  1. #!/bin/python
  2. from numpy import matrix
  3.  
  4. def SBOX(inp):
  5.     s_box = ((0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76),
  6.             (0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0),
  7.             (0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15),
  8.             (0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75),
  9.             (0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84),
  10.             (0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF),
  11.             (0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8),
  12.             (0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2),
  13.             (0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73),
  14.             (0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB),
  15.             (0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79),
  16.             (0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08),
  17.             (0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A),
  18.             (0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E),
  19.             (0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF),
  20.             (0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16))
  21.     col = inp >> 4
  22.     row = inp & 15
  23.     return s_box[row][col]
  24.  
  25. def print_table(table):
  26.     for row in range(len(table)):
  27.         for col in range(len(table[row])):
  28.             print table[row][col],
  29.             if col == len(table[row])-1:
  30.                 print "\n"
  31.  
  32. input_legth = 8  # input length of the S-Box in bits
  33. output_length = 8  # output length of the S-Box  in bits
  34.  
  35. Table = [[0 for x in range(pow(2,input_legth))] for x in range(pow(2,output_length))];  # the table, In is the XOR of the in-going pair, Out is the resulting XOR, the table returns the number of occurences
  36.  
  37. c2 = [0]*pow(2,input_legth)  # holds the results of the plain texts for later use
  38. for p2 in range(pow(2,input_legth)):
  39.     c2[p2]=SBOX(p2)
  40.  
  41. for p1 in range(pow(2,input_legth)):
  42.      c1=SBOX(p1)
  43.      for p2 in range(pow(2,input_legth)):
  44.        XOR_IN = p1 ^ p2
  45.        XOR_OUT = c1 ^ c2[p2]
  46.        Table[XOR_IN][XOR_OUT] += 1
  47.  
  48. print_table(Table)
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