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  1. #!/usr/bin/env python
  2.  
  3. Sbox = (
  4.     0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
  5.     0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
  6.     0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
  7.     0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
  8.     0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
  9. )
  10.  
  11. InvSbox = (
  12.     0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, 0x08,0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, 0x90, 0xD8,0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, 0x96, 0xAC, 0x74,0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, 0x1F, 0xDD, 0xA8, 0x33,0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2B, 0x04, 0x7E, 0xBA,0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D
  13. )
  14.  
  15.  
  16. xtime = lambda a: (((a << 1) ^ 0x1B) & 0xFF) if (a & 0x80) else (a << 1)
  17.  
  18.  
  19. Rcon = (
  20.     0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A, 0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A, 0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39
  21. )
  22.  
  23.  
  24. def t2m(text):
  25.     matrix = []
  26.     for i in range(16):
  27.         byte = (text >> (8 * (15 - i))) & 0xFF
  28.         if i % 4 == 0:
  29.             matrix.append([byte])
  30.         else:
  31.             matrix[i / 4].append(byte)
  32.     return matrix
  33.  
  34.  
  35. def m2t(matrix):
  36.     text = 0
  37.     for i in range(4):
  38.         for j in range(4):
  39.             text |= (matrix[i][j] << (120 - 8 * (4 * i + j)))
  40.     return text
  41.  
  42.  
  43. class AES:
  44.     def __init__(self, master_key):
  45.         self.change_key(master_key)
  46.  
  47.     def change_key(self, master_key):
  48.         self.round_keys = t2m(master_key)
  49.         # print self.round_keys
  50.  
  51.         for i in range(4, 4 * 11):
  52.             self.round_keys.append([])
  53.             if i % 4 == 0:
  54.                 byte = self.round_keys[i - 4][0]        \
  55.                      ^ Sbox[self.round_keys[i - 1][1]]  \
  56.                      ^ Rcon[i / 4]
  57.                 self.round_keys[i].append(byte)
  58.  
  59.                 for j in range(1, 4):
  60.                     byte = self.round_keys[i - 4][j]    \
  61.                          ^ Sbox[self.round_keys[i - 1][(j + 1) % 4]]
  62.                     self.round_keys[i].append(byte)
  63.             else:
  64.                 for j in range(4):
  65.                     byte = self.round_keys[i - 4][j]    \
  66.                          ^ self.round_keys[i - 1][j]
  67.                     self.round_keys[i].append(byte)
  68.  
  69.     def decrypt(self, ciphertext):
  70.         self.cipher_state = t2m(ciphertext)
  71.  
  72.         self.add_round_key(self.cipher_state, self.round_keys[40:])
  73.         self.inv_shift_rows(self.cipher_state)
  74.         self.inv_sub_bytes(self.cipher_state)
  75.  
  76.         for i in range(9, 0, -1):
  77.             self.round_decrypt(self.cipher_state, self.round_keys[4 * i : 4 * (i + 1)])
  78.  
  79.         self.add_round_key(self.cipher_state, self.round_keys[:4])
  80.  
  81.         return m2t(self.cipher_state)
  82.  
  83.     def add_round_key(self, s, k):
  84.         for i in range(4):
  85.             for j in range(4):
  86.                 s[i][j] ^= k[i][j]
  87.  
  88.     def round_decrypt(self, state_matrix, key_matrix):
  89.         self.add_round_key(state_matrix, key_matrix)
  90.         self.inv_mix_columns(state_matrix)
  91.         self.inv_shift_rows(state_matrix)
  92.         self.inv_sub_bytes(state_matrix)
  93.  
  94.     def sub_bytes(self, s):
  95.         for i in range(4):
  96.             for j in range(4):
  97.                 s[i][j] = Sbox[s[i][j]]
  98.  
  99.     def mix_single_column(self, a):
  100.         t = a[0] ^ a[1] ^ a[2] ^ a[3]
  101.         u = a[0]
  102.         a[0] ^= t ^ xtime(a[0] ^ a[1])
  103.         a[1] ^= t ^ xtime(a[1] ^ a[2])
  104.         a[2] ^= t ^ xtime(a[2] ^ a[3])
  105.         a[3] ^= t ^ xtime(a[3] ^ u)
  106.  
  107.  
  108.     def mix_columns(self, s):
  109.         for i in range(4):
  110.             self.mix_single_column(s[i])
  111.  
  112.     def inv_sub_bytes(self, s):
  113.         for i in range(4):
  114.             for j in range(4):
  115.                 s[i][j] = InvSbox[s[i][j]]
  116.  
  117.     def inv_shift_rows(self, s):
  118.         s[0][1], s[1][1], s[2][1], s[3][1] = s[3][1], s[0][1], s[1][1], s[2][1]
  119.         s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]
  120.         s[0][3], s[1][3], s[2][3], s[3][3] = s[1][3], s[2][3], s[3][3], s[0][3]
  121.  
  122.     def inv_mix_columns(self, s):
  123.         for i in range(4):
  124.             u = xtime(xtime(s[i][0] ^ s[i][2]))
  125.             v = xtime(xtime(s[i][1] ^ s[i][3]))
  126.             s[i][0] ^= u
  127.             s[i][1] ^= v
  128.             s[i][2] ^= u
  129.             s[i][3] ^= v
  130.  
  131.         self.mix_columns(s)
  132.  
  133.  
  134. aes = AES(0x2b7e151628aed2a6abf7158809cf4f3c)
  135. cypher = 0x110414d9e16367cea4269282504b7daeb27e32ee510c0f1a2b11ee9d48c13806
  136.  
  137. bits = []
  138. while cypher:
  139.     bits.append(cypher & ((1 << 128) - 1))
  140.     cypher >>= 128
  141. bits.reverse()
  142. msg = ""
  143.  
  144. import binascii
  145. for c in bits:
  146.     decrypt = aes.decrypt(c)
  147.     msg = msg + binascii.a2b_hex(str(hex(decrypt))[2:-1])
  148.  
  149. print (msg)
Success #stdin #stdout 0.02s 7452KB
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Paranoia is our profession
https://ideone.com/fGTjYf
language:
Python (cpython 2.7.16)
created:
45 days ago
visibility:
public

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