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aes.py (16979B)

    

  1. from __future__ import unicode_literals
  3. from math import ceil
  5. from .compat import compat_b64decode
  6. from .utils import bytes_to_intlist, intlist_to_bytes
  8. BLOCK_SIZE_BYTES = 16
  11. def pkcs7_padding(data):
  12.     """
  13.     PKCS#7 padding
  15.     @param {int[]} data        cleartext
  16.     @returns {int[]}           padding data
  17.     """
  19.     remaining_length = BLOCK_SIZE_BYTES - len(data) % BLOCK_SIZE_BYTES
  20.     return data + [remaining_length] * remaining_length
  23. def aes_ctr_decrypt(data, key, counter):
  24.     """
  25.     Decrypt with aes in counter mode
  27.     @param {int[]} data        cipher
  28.     @param {int[]} key         16/24/32-Byte cipher key
  29.     @param {instance} counter  Instance whose next_value function (@returns {int[]}  16-Byte block)
  30.                                returns the next counter block
  31.     @returns {int[]}           decrypted data
  32.     """
  33.     expanded_key = key_expansion(key)
  34.     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
  36.     decrypted_data = []
  37.     for i in range(block_count):
  38.         counter_block = counter.next_value()
  39.         block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
  40.         block += [0] * (BLOCK_SIZE_BYTES - len(block))
  42.         cipher_counter_block = aes_encrypt(counter_block, expanded_key)
  43.         decrypted_data += xor(block, cipher_counter_block)
  44.     decrypted_data = decrypted_data[:len(data)]
  46.     return decrypted_data
  49. def aes_cbc_decrypt(data, key, iv):
  50.     """
  51.     Decrypt with aes in CBC mode
  53.     @param {int[]} data        cipher
  54.     @param {int[]} key         16/24/32-Byte cipher key
  55.     @param {int[]} iv          16-Byte IV
  56.     @returns {int[]}           decrypted data
  57.     """
  58.     expanded_key = key_expansion(key)
  59.     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
  61.     decrypted_data = []
  62.     previous_cipher_block = iv
  63.     for i in range(block_count):
  64.         block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
  65.         block += [0] * (BLOCK_SIZE_BYTES - len(block))
  67.         decrypted_block = aes_decrypt(block, expanded_key)
  68.         decrypted_data += xor(decrypted_block, previous_cipher_block)
  69.         previous_cipher_block = block
  70.     decrypted_data = decrypted_data[:len(data)]
  72.     return decrypted_data
  75. def aes_cbc_encrypt(data, key, iv):
  76.     """
  77.     Encrypt with aes in CBC mode. Using PKCS#7 padding
  79.     @param {int[]} data        cleartext
  80.     @param {int[]} key         16/24/32-Byte cipher key
  81.     @param {int[]} iv          16-Byte IV
  82.     @returns {int[]}           encrypted data
  83.     """
  84.     expanded_key = key_expansion(key)
  85.     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
  87.     encrypted_data = []
  88.     previous_cipher_block = iv
  89.     for i in range(block_count):
  90.         block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
  91.         block = pkcs7_padding(block)
  92.         mixed_block = xor(block, previous_cipher_block)
  94.         encrypted_block = aes_encrypt(mixed_block, expanded_key)
  95.         encrypted_data += encrypted_block
  97.         previous_cipher_block = encrypted_block
  99.     return encrypted_data
  102. def aes_ecb_encrypt(data, key):
  103.     """
  104.     Encrypt with aes in ECB mode. Using PKCS#7 padding
  106.     @param {int[]} data        cleartext
  107.     @param {int[]} key         16/24/32-Byte cipher key
  108.     @returns {int[]}           encrypted data
  109.     """
  110.     expanded_key = key_expansion(key)
  111.     block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
  113.     encrypted_data = []
  114.     for i in range(block_count):
  115.         block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
  116.         block = pkcs7_padding(block)
  118.         encrypted_block = aes_encrypt(block, expanded_key)
  119.         encrypted_data += encrypted_block
  121.     return encrypted_data
  124. def key_expansion(data):
  125.     """
  126.     Generate key schedule
  128.     @param {int[]} data  16/24/32-Byte cipher key
  129.     @returns {int[]}     176/208/240-Byte expanded key
  130.     """
  131.     data = data[:]  # copy
  132.     rcon_iteration = 1
  133.     key_size_bytes = len(data)
  134.     expanded_key_size_bytes = (key_size_bytes // 4 + 7) * BLOCK_SIZE_BYTES
  136.     while len(data) < expanded_key_size_bytes:
  137.         temp = data[-4:]
  138.         temp = key_schedule_core(temp, rcon_iteration)
  139.         rcon_iteration += 1
  140.         data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
  142.         for _ in range(3):
  143.             temp = data[-4:]
  144.             data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
  146.         if key_size_bytes == 32:
  147.             temp = data[-4:]
  148.             temp = sub_bytes(temp)
  149.             data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
  151.         for _ in range(3 if key_size_bytes == 32 else 2 if key_size_bytes == 24 else 0):
  152.             temp = data[-4:]
  153.             data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
  154.     data = data[:expanded_key_size_bytes]
  156.     return data
  159. def aes_encrypt(data, expanded_key):
  160.     """
  161.     Encrypt one block with aes
  163.     @param {int[]} data          16-Byte state
  164.     @param {int[]} expanded_key  176/208/240-Byte expanded key
  165.     @returns {int[]}             16-Byte cipher
  166.     """
  167.     rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
  169.     data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
  170.     for i in range(1, rounds + 1):
  171.         data = sub_bytes(data)
  172.         data = shift_rows(data)
  173.         if i != rounds:
  174.             data = mix_columns(data)
  175.         data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
  177.     return data
  180. def aes_decrypt(data, expanded_key):
  181.     """
  182.     Decrypt one block with aes
  184.     @param {int[]} data          16-Byte cipher
  185.     @param {int[]} expanded_key  176/208/240-Byte expanded key
  186.     @returns {int[]}             16-Byte state
  187.     """
  188.     rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
  190.     for i in range(rounds, 0, -1):
  191.         data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
  192.         if i != rounds:
  193.             data = mix_columns_inv(data)
  194.         data = shift_rows_inv(data)
  195.         data = sub_bytes_inv(data)
  196.     data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
  198.     return data
  201. def aes_decrypt_text(data, password, key_size_bytes):
  202.     """
  203.     Decrypt text
  204.     - The first 8 Bytes of decoded 'data' are the 8 high Bytes of the counter
  205.     - The cipher key is retrieved by encrypting the first 16 Byte of 'password'
  206.       with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's)
  207.     - Mode of operation is 'counter'
  209.     @param {str} data                    Base64 encoded string
  210.     @param {str,unicode} password        Password (will be encoded with utf-8)
  211.     @param {int} key_size_bytes          Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit
  212.     @returns {str}                       Decrypted data
  213.     """
  214.     NONCE_LENGTH_BYTES = 8
  216.     data = bytes_to_intlist(compat_b64decode(data))
  217.     password = bytes_to_intlist(password.encode('utf-8'))
  219.     key = password[:key_size_bytes] + [0] * (key_size_bytes - len(password))
  220.     key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES)
  222.     nonce = data[:NONCE_LENGTH_BYTES]
  223.     cipher = data[NONCE_LENGTH_BYTES:]
  225.     class Counter(object):
  226.         __value = nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)
  228.         def next_value(self):
  229.             temp = self.__value
  230.             self.__value = inc(self.__value)
  231.             return temp
  233.     decrypted_data = aes_ctr_decrypt(cipher, key, Counter())
  234.     plaintext = intlist_to_bytes(decrypted_data)
  236.     return plaintext
  239. RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
  240. SBOX = (0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
  241.         0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
  242.         0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
  243.         0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
  244.         0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
  245.         0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
  246.         0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
  247.         0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
  248.         0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
  249.         0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
  250.         0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
  251.         0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
  252.         0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
  253.         0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
  254.         0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
  255.         0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16)
  256. SBOX_INV = (0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
  257.             0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
  258.             0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
  259.             0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
  260.             0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
  261.             0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
  262.             0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
  263.             0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
  264.             0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
  265.             0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
  266.             0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
  267.             0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
  268.             0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
  269.             0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
  270.             0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
  271.             0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d)
  272. MIX_COLUMN_MATRIX = ((0x2, 0x3, 0x1, 0x1),
  273.                      (0x1, 0x2, 0x3, 0x1),
  274.                      (0x1, 0x1, 0x2, 0x3),
  275.                      (0x3, 0x1, 0x1, 0x2))
  276. MIX_COLUMN_MATRIX_INV = ((0xE, 0xB, 0xD, 0x9),
  277.                          (0x9, 0xE, 0xB, 0xD),
  278.                          (0xD, 0x9, 0xE, 0xB),
  279.                          (0xB, 0xD, 0x9, 0xE))
  280. RIJNDAEL_EXP_TABLE = (0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35,
  281.                       0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA,
  282.                       0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31,
  283.                       0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC, 0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD,
  284.                       0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7, 0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88,
  285.                       0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F, 0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A,
  286.                       0xB5, 0xC4, 0x57, 0xF9, 0x10, 0x30, 0x50, 0xF0, 0x0B, 0x1D, 0x27, 0x69, 0xBB, 0xD6, 0x61, 0xA3,
  287.                       0xFE, 0x19, 0x2B, 0x7D, 0x87, 0x92, 0xAD, 0xEC, 0x2F, 0x71, 0x93, 0xAE, 0xE9, 0x20, 0x60, 0xA0,
  288.                       0xFB, 0x16, 0x3A, 0x4E, 0xD2, 0x6D, 0xB7, 0xC2, 0x5D, 0xE7, 0x32, 0x56, 0xFA, 0x15, 0x3F, 0x41,
  289.                       0xC3, 0x5E, 0xE2, 0x3D, 0x47, 0xC9, 0x40, 0xC0, 0x5B, 0xED, 0x2C, 0x74, 0x9C, 0xBF, 0xDA, 0x75,
  290.                       0x9F, 0xBA, 0xD5, 0x64, 0xAC, 0xEF, 0x2A, 0x7E, 0x82, 0x9D, 0xBC, 0xDF, 0x7A, 0x8E, 0x89, 0x80,
  291.                       0x9B, 0xB6, 0xC1, 0x58, 0xE8, 0x23, 0x65, 0xAF, 0xEA, 0x25, 0x6F, 0xB1, 0xC8, 0x43, 0xC5, 0x54,
  292.                       0xFC, 0x1F, 0x21, 0x63, 0xA5, 0xF4, 0x07, 0x09, 0x1B, 0x2D, 0x77, 0x99, 0xB0, 0xCB, 0x46, 0xCA,
  293.                       0x45, 0xCF, 0x4A, 0xDE, 0x79, 0x8B, 0x86, 0x91, 0xA8, 0xE3, 0x3E, 0x42, 0xC6, 0x51, 0xF3, 0x0E,
  294.                       0x12, 0x36, 0x5A, 0xEE, 0x29, 0x7B, 0x8D, 0x8C, 0x8F, 0x8A, 0x85, 0x94, 0xA7, 0xF2, 0x0D, 0x17,
  295.                       0x39, 0x4B, 0xDD, 0x7C, 0x84, 0x97, 0xA2, 0xFD, 0x1C, 0x24, 0x6C, 0xB4, 0xC7, 0x52, 0xF6, 0x01)
  296. RIJNDAEL_LOG_TABLE = (0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6, 0x4b, 0xc7, 0x1b, 0x68, 0x33, 0xee, 0xdf, 0x03,
  297.                       0x64, 0x04, 0xe0, 0x0e, 0x34, 0x8d, 0x81, 0xef, 0x4c, 0x71, 0x08, 0xc8, 0xf8, 0x69, 0x1c, 0xc1,
  298.                       0x7d, 0xc2, 0x1d, 0xb5, 0xf9, 0xb9, 0x27, 0x6a, 0x4d, 0xe4, 0xa6, 0x72, 0x9a, 0xc9, 0x09, 0x78,
  299.                       0x65, 0x2f, 0x8a, 0x05, 0x21, 0x0f, 0xe1, 0x24, 0x12, 0xf0, 0x82, 0x45, 0x35, 0x93, 0xda, 0x8e,
  300.                       0x96, 0x8f, 0xdb, 0xbd, 0x36, 0xd0, 0xce, 0x94, 0x13, 0x5c, 0xd2, 0xf1, 0x40, 0x46, 0x83, 0x38,
  301.                       0x66, 0xdd, 0xfd, 0x30, 0xbf, 0x06, 0x8b, 0x62, 0xb3, 0x25, 0xe2, 0x98, 0x22, 0x88, 0x91, 0x10,
  302.                       0x7e, 0x6e, 0x48, 0xc3, 0xa3, 0xb6, 0x1e, 0x42, 0x3a, 0x6b, 0x28, 0x54, 0xfa, 0x85, 0x3d, 0xba,
  303.                       0x2b, 0x79, 0x0a, 0x15, 0x9b, 0x9f, 0x5e, 0xca, 0x4e, 0xd4, 0xac, 0xe5, 0xf3, 0x73, 0xa7, 0x57,
  304.                       0xaf, 0x58, 0xa8, 0x50, 0xf4, 0xea, 0xd6, 0x74, 0x4f, 0xae, 0xe9, 0xd5, 0xe7, 0xe6, 0xad, 0xe8,
  305.                       0x2c, 0xd7, 0x75, 0x7a, 0xeb, 0x16, 0x0b, 0xf5, 0x59, 0xcb, 0x5f, 0xb0, 0x9c, 0xa9, 0x51, 0xa0,
  306.                       0x7f, 0x0c, 0xf6, 0x6f, 0x17, 0xc4, 0x49, 0xec, 0xd8, 0x43, 0x1f, 0x2d, 0xa4, 0x76, 0x7b, 0xb7,
  307.                       0xcc, 0xbb, 0x3e, 0x5a, 0xfb, 0x60, 0xb1, 0x86, 0x3b, 0x52, 0xa1, 0x6c, 0xaa, 0x55, 0x29, 0x9d,
  308.                       0x97, 0xb2, 0x87, 0x90, 0x61, 0xbe, 0xdc, 0xfc, 0xbc, 0x95, 0xcf, 0xcd, 0x37, 0x3f, 0x5b, 0xd1,
  309.                       0x53, 0x39, 0x84, 0x3c, 0x41, 0xa2, 0x6d, 0x47, 0x14, 0x2a, 0x9e, 0x5d, 0x56, 0xf2, 0xd3, 0xab,
  310.                       0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89, 0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5,
  311.                       0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18, 0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07)
  314. def sub_bytes(data):
  315.     return [SBOX[x] for x in data]
  318. def sub_bytes_inv(data):
  319.     return [SBOX_INV[x] for x in data]
  322. def rotate(data):
  323.     return data[1:] + [data[0]]
  326. def key_schedule_core(data, rcon_iteration):
  327.     data = rotate(data)
  328.     data = sub_bytes(data)
  329.     data[0] = data[0] ^ RCON[rcon_iteration]
  331.     return data
  334. def xor(data1, data2):
  335.     return [x ^ y for x, y in zip(data1, data2)]
  338. def rijndael_mul(a, b):
  339.     if (a == 0 or b == 0):
  340.         return 0
  341.     return RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[a] + RIJNDAEL_LOG_TABLE[b]) % 0xFF]
  344. def mix_column(data, matrix):
  345.     data_mixed = []
  346.     for row in range(4):
  347.         mixed = 0
  348.         for column in range(4):
  349.             # xor is (+) and (-)
  350.             mixed ^= rijndael_mul(data[column], matrix[row][column])
  351.         data_mixed.append(mixed)
  352.     return data_mixed
  355. def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
  356.     data_mixed = []
  357.     for i in range(4):
  358.         column = data[i * 4: (i + 1) * 4]
  359.         data_mixed += mix_column(column, matrix)
  360.     return data_mixed
  363. def mix_columns_inv(data):
  364.     return mix_columns(data, MIX_COLUMN_MATRIX_INV)
  367. def shift_rows(data):
  368.     data_shifted = []
  369.     for column in range(4):
  370.         for row in range(4):
  371.             data_shifted.append(data[((column + row) & 0b11) * 4 + row])
  372.     return data_shifted
  375. def shift_rows_inv(data):
  376.     data_shifted = []
  377.     for column in range(4):
  378.         for row in range(4):
  379.             data_shifted.append(data[((column - row) & 0b11) * 4 + row])
  380.     return data_shifted
  383. def inc(data):
  384.     data = data[:]  # copy
  385.     for i in range(len(data) - 1, -1, -1):
  386.         if data[i] == 255:
  387.             data[i] = 0
  388.         else:
  389.             data[i] = data[i] + 1
  390.             break
  391.     return data
  394. __all__ = ['aes_encrypt', 'key_expansion', 'aes_ctr_decrypt', 'aes_cbc_decrypt', 'aes_decrypt_text']