Merge branch 'modular-data-extract'

Commits in this branch are prefixed with "Extraction:"
This branch refactors data extraction. All such functionality has been moved to the yt_data_extract module.
Responses from requests are given to the module and it parses them into a consistent, more useful format.
The dependency on youtube-dl has also been dropped and this functionality has been built from scratch for these reasons:
(1) I've noticed youtube-dl breaks more often than invidious (which uses watch page extraction built from scratch) in response to changes from Youtube, so I'm hoping what I wrote will also be less brittle.
(2) Such breakage is inconvenient because I have to manually merge the fixes since I had to make changes to youtube-dl to make it do things such as extracting related videos.
(3) I have no control over error handling and request pooling with youtube-dl, since it does all the requests (these would require intrusive changes I don't want to maintain).
(4) I will now be able to finally display the number of comments and whether comments are disabled without making additional requests.

1 files changed, 0 insertions, 361 deletions

diff --git a/youtube_dl/aes.py b/youtube_dl/aes.py
deleted file mode 100644
index 461bb6d..0000000
--- a/youtube_dl/aes.py
+++ /dev/null
@@ -1,361 +0,0 @@
-from __future__ import unicode_literals
-
-from math import ceil
-
-from .compat import compat_b64decode
-from .utils import bytes_to_intlist, intlist_to_bytes
-
-BLOCK_SIZE_BYTES = 16
-
-
-def aes_ctr_decrypt(data, key, counter):
-    """
-    Decrypt with aes in counter mode
-
-    @param {int[]} data        cipher
-    @param {int[]} key         16/24/32-Byte cipher key
-    @param {instance} counter  Instance whose next_value function (@returns {int[]}  16-Byte block)
-                               returns the next counter block
-    @returns {int[]}           decrypted data
-    """
-    expanded_key = key_expansion(key)
-    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
-
-    decrypted_data = []
-    for i in range(block_count):
-        counter_block = counter.next_value()
-        block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
-        block += [0] * (BLOCK_SIZE_BYTES - len(block))
-
-        cipher_counter_block = aes_encrypt(counter_block, expanded_key)
-        decrypted_data += xor(block, cipher_counter_block)
-    decrypted_data = decrypted_data[:len(data)]
-
-    return decrypted_data
-
-
-def aes_cbc_decrypt(data, key, iv):
-    """
-    Decrypt with aes in CBC mode
-
-    @param {int[]} data        cipher
-    @param {int[]} key         16/24/32-Byte cipher key
-    @param {int[]} iv          16-Byte IV
-    @returns {int[]}           decrypted data
-    """
-    expanded_key = key_expansion(key)
-    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
-
-    decrypted_data = []
-    previous_cipher_block = iv
-    for i in range(block_count):
-        block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
-        block += [0] * (BLOCK_SIZE_BYTES - len(block))
-
-        decrypted_block = aes_decrypt(block, expanded_key)
-        decrypted_data += xor(decrypted_block, previous_cipher_block)
-        previous_cipher_block = block
-    decrypted_data = decrypted_data[:len(data)]
-
-    return decrypted_data
-
-
-def aes_cbc_encrypt(data, key, iv):
-    """
-    Encrypt with aes in CBC mode. Using PKCS#7 padding
-
-    @param {int[]} data        cleartext
-    @param {int[]} key         16/24/32-Byte cipher key
-    @param {int[]} iv          16-Byte IV
-    @returns {int[]}           encrypted data
-    """
-    expanded_key = key_expansion(key)
-    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
-
-    encrypted_data = []
-    previous_cipher_block = iv
-    for i in range(block_count):
-        block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
-        remaining_length = BLOCK_SIZE_BYTES - len(block)
-        block += [remaining_length] * remaining_length
-        mixed_block = xor(block, previous_cipher_block)
-
-        encrypted_block = aes_encrypt(mixed_block, expanded_key)
-        encrypted_data += encrypted_block
-
-        previous_cipher_block = encrypted_block
-
-    return encrypted_data
-
-
-def key_expansion(data):
-    """
-    Generate key schedule
-
-    @param {int[]} data  16/24/32-Byte cipher key
-    @returns {int[]}     176/208/240-Byte expanded key
-    """
-    data = data[:]  # copy
-    rcon_iteration = 1
-    key_size_bytes = len(data)
-    expanded_key_size_bytes = (key_size_bytes // 4 + 7) * BLOCK_SIZE_BYTES
-
-    while len(data) < expanded_key_size_bytes:
-        temp = data[-4:]
-        temp = key_schedule_core(temp, rcon_iteration)
-        rcon_iteration += 1
-        data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
-
-        for _ in range(3):
-            temp = data[-4:]
-            data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
-
-        if key_size_bytes == 32:
-            temp = data[-4:]
-            temp = sub_bytes(temp)
-            data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
-
-        for _ in range(3 if key_size_bytes == 32 else 2 if key_size_bytes == 24 else 0):
-            temp = data[-4:]
-            data += xor(temp, data[-key_size_bytes: 4 - key_size_bytes])
-    data = data[:expanded_key_size_bytes]
-
-    return data
-
-
-def aes_encrypt(data, expanded_key):
-    """
-    Encrypt one block with aes
-
-    @param {int[]} data          16-Byte state
-    @param {int[]} expanded_key  176/208/240-Byte expanded key
-    @returns {int[]}             16-Byte cipher
-    """
-    rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
-
-    data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
-    for i in range(1, rounds + 1):
-        data = sub_bytes(data)
-        data = shift_rows(data)
-        if i != rounds:
-            data = mix_columns(data)
-        data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
-
-    return data
-
-
-def aes_decrypt(data, expanded_key):
-    """
-    Decrypt one block with aes
-
-    @param {int[]} data          16-Byte cipher
-    @param {int[]} expanded_key  176/208/240-Byte expanded key
-    @returns {int[]}             16-Byte state
-    """
-    rounds = len(expanded_key) // BLOCK_SIZE_BYTES - 1
-
-    for i in range(rounds, 0, -1):
-        data = xor(data, expanded_key[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES])
-        if i != rounds:
-            data = mix_columns_inv(data)
-        data = shift_rows_inv(data)
-        data = sub_bytes_inv(data)
-    data = xor(data, expanded_key[:BLOCK_SIZE_BYTES])
-
-    return data
-
-
-def aes_decrypt_text(data, password, key_size_bytes):
-    """
-    Decrypt text
-    - The first 8 Bytes of decoded 'data' are the 8 high Bytes of the counter
-    - The cipher key is retrieved by encrypting the first 16 Byte of 'password'
-      with the first 'key_size_bytes' Bytes from 'password' (if necessary filled with 0's)
-    - Mode of operation is 'counter'
-
-    @param {str} data                    Base64 encoded string
-    @param {str,unicode} password        Password (will be encoded with utf-8)
-    @param {int} key_size_bytes          Possible values: 16 for 128-Bit, 24 for 192-Bit or 32 for 256-Bit
-    @returns {str}                       Decrypted data
-    """
-    NONCE_LENGTH_BYTES = 8
-
-    data = bytes_to_intlist(compat_b64decode(data))
-    password = bytes_to_intlist(password.encode('utf-8'))
-
-    key = password[:key_size_bytes] + [0] * (key_size_bytes - len(password))
-    key = aes_encrypt(key[:BLOCK_SIZE_BYTES], key_expansion(key)) * (key_size_bytes // BLOCK_SIZE_BYTES)
-
-    nonce = data[:NONCE_LENGTH_BYTES]
-    cipher = data[NONCE_LENGTH_BYTES:]
-
-    class Counter(object):
-        __value = nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES)
-
-        def next_value(self):
-            temp = self.__value
-            self.__value = inc(self.__value)
-            return temp
-
-    decrypted_data = aes_ctr_decrypt(cipher, key, Counter())
-    plaintext = intlist_to_bytes(decrypted_data)
-
-    return plaintext
-
-
-RCON = (0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36)
-SBOX = (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,
-        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,
-        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,
-        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,
-        0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16)
-SBOX_INV = (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)
-MIX_COLUMN_MATRIX = ((0x2, 0x3, 0x1, 0x1),
-                     (0x1, 0x2, 0x3, 0x1),
-                     (0x1, 0x1, 0x2, 0x3),
-                     (0x3, 0x1, 0x1, 0x2))
-MIX_COLUMN_MATRIX_INV = ((0xE, 0xB, 0xD, 0x9),
-                         (0x9, 0xE, 0xB, 0xD),
-                         (0xD, 0x9, 0xE, 0xB),
-                         (0xB, 0xD, 0x9, 0xE))
-RIJNDAEL_EXP_TABLE = (0x01, 0x03, 0x05, 0x0F, 0x11, 0x33, 0x55, 0xFF, 0x1A, 0x2E, 0x72, 0x96, 0xA1, 0xF8, 0x13, 0x35,
-                      0x5F, 0xE1, 0x38, 0x48, 0xD8, 0x73, 0x95, 0xA4, 0xF7, 0x02, 0x06, 0x0A, 0x1E, 0x22, 0x66, 0xAA,
-                      0xE5, 0x34, 0x5C, 0xE4, 0x37, 0x59, 0xEB, 0x26, 0x6A, 0xBE, 0xD9, 0x70, 0x90, 0xAB, 0xE6, 0x31,
-                      0x53, 0xF5, 0x04, 0x0C, 0x14, 0x3C, 0x44, 0xCC, 0x4F, 0xD1, 0x68, 0xB8, 0xD3, 0x6E, 0xB2, 0xCD,
-                      0x4C, 0xD4, 0x67, 0xA9, 0xE0, 0x3B, 0x4D, 0xD7, 0x62, 0xA6, 0xF1, 0x08, 0x18, 0x28, 0x78, 0x88,
-                      0x83, 0x9E, 0xB9, 0xD0, 0x6B, 0xBD, 0xDC, 0x7F, 0x81, 0x98, 0xB3, 0xCE, 0x49, 0xDB, 0x76, 0x9A,
-                      0xB5, 0xC4, 0x57, 0xF9, 0x10, 0x30, 0x50, 0xF0, 0x0B, 0x1D, 0x27, 0x69, 0xBB, 0xD6, 0x61, 0xA3,
-                      0xFE, 0x19, 0x2B, 0x7D, 0x87, 0x92, 0xAD, 0xEC, 0x2F, 0x71, 0x93, 0xAE, 0xE9, 0x20, 0x60, 0xA0,
-                      0xFB, 0x16, 0x3A, 0x4E, 0xD2, 0x6D, 0xB7, 0xC2, 0x5D, 0xE7, 0x32, 0x56, 0xFA, 0x15, 0x3F, 0x41,
-                      0xC3, 0x5E, 0xE2, 0x3D, 0x47, 0xC9, 0x40, 0xC0, 0x5B, 0xED, 0x2C, 0x74, 0x9C, 0xBF, 0xDA, 0x75,
-                      0x9F, 0xBA, 0xD5, 0x64, 0xAC, 0xEF, 0x2A, 0x7E, 0x82, 0x9D, 0xBC, 0xDF, 0x7A, 0x8E, 0x89, 0x80,
-                      0x9B, 0xB6, 0xC1, 0x58, 0xE8, 0x23, 0x65, 0xAF, 0xEA, 0x25, 0x6F, 0xB1, 0xC8, 0x43, 0xC5, 0x54,
-                      0xFC, 0x1F, 0x21, 0x63, 0xA5, 0xF4, 0x07, 0x09, 0x1B, 0x2D, 0x77, 0x99, 0xB0, 0xCB, 0x46, 0xCA,
-                      0x45, 0xCF, 0x4A, 0xDE, 0x79, 0x8B, 0x86, 0x91, 0xA8, 0xE3, 0x3E, 0x42, 0xC6, 0x51, 0xF3, 0x0E,
-                      0x12, 0x36, 0x5A, 0xEE, 0x29, 0x7B, 0x8D, 0x8C, 0x8F, 0x8A, 0x85, 0x94, 0xA7, 0xF2, 0x0D, 0x17,
-                      0x39, 0x4B, 0xDD, 0x7C, 0x84, 0x97, 0xA2, 0xFD, 0x1C, 0x24, 0x6C, 0xB4, 0xC7, 0x52, 0xF6, 0x01)
-RIJNDAEL_LOG_TABLE = (0x00, 0x00, 0x19, 0x01, 0x32, 0x02, 0x1a, 0xc6, 0x4b, 0xc7, 0x1b, 0x68, 0x33, 0xee, 0xdf, 0x03,
-                      0x64, 0x04, 0xe0, 0x0e, 0x34, 0x8d, 0x81, 0xef, 0x4c, 0x71, 0x08, 0xc8, 0xf8, 0x69, 0x1c, 0xc1,
-                      0x7d, 0xc2, 0x1d, 0xb5, 0xf9, 0xb9, 0x27, 0x6a, 0x4d, 0xe4, 0xa6, 0x72, 0x9a, 0xc9, 0x09, 0x78,
-                      0x65, 0x2f, 0x8a, 0x05, 0x21, 0x0f, 0xe1, 0x24, 0x12, 0xf0, 0x82, 0x45, 0x35, 0x93, 0xda, 0x8e,
-                      0x96, 0x8f, 0xdb, 0xbd, 0x36, 0xd0, 0xce, 0x94, 0x13, 0x5c, 0xd2, 0xf1, 0x40, 0x46, 0x83, 0x38,
-                      0x66, 0xdd, 0xfd, 0x30, 0xbf, 0x06, 0x8b, 0x62, 0xb3, 0x25, 0xe2, 0x98, 0x22, 0x88, 0x91, 0x10,
-                      0x7e, 0x6e, 0x48, 0xc3, 0xa3, 0xb6, 0x1e, 0x42, 0x3a, 0x6b, 0x28, 0x54, 0xfa, 0x85, 0x3d, 0xba,
-                      0x2b, 0x79, 0x0a, 0x15, 0x9b, 0x9f, 0x5e, 0xca, 0x4e, 0xd4, 0xac, 0xe5, 0xf3, 0x73, 0xa7, 0x57,
-                      0xaf, 0x58, 0xa8, 0x50, 0xf4, 0xea, 0xd6, 0x74, 0x4f, 0xae, 0xe9, 0xd5, 0xe7, 0xe6, 0xad, 0xe8,
-                      0x2c, 0xd7, 0x75, 0x7a, 0xeb, 0x16, 0x0b, 0xf5, 0x59, 0xcb, 0x5f, 0xb0, 0x9c, 0xa9, 0x51, 0xa0,
-                      0x7f, 0x0c, 0xf6, 0x6f, 0x17, 0xc4, 0x49, 0xec, 0xd8, 0x43, 0x1f, 0x2d, 0xa4, 0x76, 0x7b, 0xb7,
-                      0xcc, 0xbb, 0x3e, 0x5a, 0xfb, 0x60, 0xb1, 0x86, 0x3b, 0x52, 0xa1, 0x6c, 0xaa, 0x55, 0x29, 0x9d,
-                      0x97, 0xb2, 0x87, 0x90, 0x61, 0xbe, 0xdc, 0xfc, 0xbc, 0x95, 0xcf, 0xcd, 0x37, 0x3f, 0x5b, 0xd1,
-                      0x53, 0x39, 0x84, 0x3c, 0x41, 0xa2, 0x6d, 0x47, 0x14, 0x2a, 0x9e, 0x5d, 0x56, 0xf2, 0xd3, 0xab,
-                      0x44, 0x11, 0x92, 0xd9, 0x23, 0x20, 0x2e, 0x89, 0xb4, 0x7c, 0xb8, 0x26, 0x77, 0x99, 0xe3, 0xa5,
-                      0x67, 0x4a, 0xed, 0xde, 0xc5, 0x31, 0xfe, 0x18, 0x0d, 0x63, 0x8c, 0x80, 0xc0, 0xf7, 0x70, 0x07)
-
-
-def sub_bytes(data):
-    return [SBOX[x] for x in data]
-
-
-def sub_bytes_inv(data):
-    return [SBOX_INV[x] for x in data]
-
-
-def rotate(data):
-    return data[1:] + [data[0]]
-
-
-def key_schedule_core(data, rcon_iteration):
-    data = rotate(data)
-    data = sub_bytes(data)
-    data[0] = data[0] ^ RCON[rcon_iteration]
-
-    return data
-
-
-def xor(data1, data2):
-    return [x ^ y for x, y in zip(data1, data2)]
-
-
-def rijndael_mul(a, b):
-    if(a == 0 or b == 0):
-        return 0
-    return RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[a] + RIJNDAEL_LOG_TABLE[b]) % 0xFF]
-
-
-def mix_column(data, matrix):
-    data_mixed = []
-    for row in range(4):
-        mixed = 0
-        for column in range(4):
-            # xor is (+) and (-)
-            mixed ^= rijndael_mul(data[column], matrix[row][column])
-        data_mixed.append(mixed)
-    return data_mixed
-
-
-def mix_columns(data, matrix=MIX_COLUMN_MATRIX):
-    data_mixed = []
-    for i in range(4):
-        column = data[i * 4: (i + 1) * 4]
-        data_mixed += mix_column(column, matrix)
-    return data_mixed
-
-
-def mix_columns_inv(data):
-    return mix_columns(data, MIX_COLUMN_MATRIX_INV)
-
-
-def shift_rows(data):
-    data_shifted = []
-    for column in range(4):
-        for row in range(4):
-            data_shifted.append(data[((column + row) & 0b11) * 4 + row])
-    return data_shifted
-
-
-def shift_rows_inv(data):
-    data_shifted = []
-    for column in range(4):
-        for row in range(4):
-            data_shifted.append(data[((column - row) & 0b11) * 4 + row])
-    return data_shifted
-
-
-def inc(data):
-    data = data[:]  # copy
-    for i in range(len(data) - 1, -1, -1):
-        if data[i] == 255:
-            data[i] = 0
-        else:
-            data[i] = data[i] + 1
-            break
-    return data
-
-
-__all__ = ['aes_encrypt', 'key_expansion', 'aes_ctr_decrypt', 'aes_cbc_decrypt', 'aes_decrypt_text']