summaryrefslogtreecommitdiffstats
path: root/yt_dlp/aes.py
blob: b3a383cd9c3f87bee4b327e703f10fb905ccf848 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
import base64
from math import ceil

from .compat import compat_ord
from .dependencies import Cryptodome
from .utils import bytes_to_intlist, intlist_to_bytes

if Cryptodome.AES:
    def aes_cbc_decrypt_bytes(data, key, iv):
        """ Decrypt bytes with AES-CBC using pycryptodome """
        return Cryptodome.AES.new(key, Cryptodome.AES.MODE_CBC, iv).decrypt(data)

    def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce):
        """ Decrypt bytes with AES-GCM using pycryptodome """
        return Cryptodome.AES.new(key, Cryptodome.AES.MODE_GCM, nonce).decrypt_and_verify(data, tag)

else:
    def aes_cbc_decrypt_bytes(data, key, iv):
        """ Decrypt bytes with AES-CBC using native implementation since pycryptodome is unavailable """
        return intlist_to_bytes(aes_cbc_decrypt(*map(bytes_to_intlist, (data, key, iv))))

    def aes_gcm_decrypt_and_verify_bytes(data, key, tag, nonce):
        """ Decrypt bytes with AES-GCM using native implementation since pycryptodome is unavailable """
        return intlist_to_bytes(aes_gcm_decrypt_and_verify(*map(bytes_to_intlist, (data, key, tag, nonce))))


def aes_cbc_encrypt_bytes(data, key, iv, **kwargs):
    return intlist_to_bytes(aes_cbc_encrypt(*map(bytes_to_intlist, (data, key, iv)), **kwargs))


BLOCK_SIZE_BYTES = 16


def unpad_pkcs7(data):
    return data[:-compat_ord(data[-1])]


def pkcs7_padding(data):
    """
    PKCS#7 padding

    @param {int[]} data        cleartext
    @returns {int[]}           padding data
    """

    remaining_length = BLOCK_SIZE_BYTES - len(data) % BLOCK_SIZE_BYTES
    return data + [remaining_length] * remaining_length


def pad_block(block, padding_mode):
    """
    Pad a block with the given padding mode
    @param {int[]} block        block to pad
    @param padding_mode         padding mode
    """
    padding_size = BLOCK_SIZE_BYTES - len(block)

    PADDING_BYTE = {
        'pkcs7': padding_size,
        'iso7816': 0x0,
        'whitespace': 0x20,
        'zero': 0x0,
    }

    if padding_size < 0:
        raise ValueError('Block size exceeded')
    elif padding_mode not in PADDING_BYTE:
        raise NotImplementedError(f'Padding mode {padding_mode} is not implemented')

    if padding_mode == 'iso7816' and padding_size:
        block = block + [0x80]  # NB: += mutates list
        padding_size -= 1

    return block + [PADDING_BYTE[padding_mode]] * padding_size


def aes_ecb_encrypt(data, key, iv=None):
    """
    Encrypt with aes in ECB mode. Using PKCS#7 padding

    @param {int[]} data        cleartext
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          Unused for this mode
    @returns {int[]}           encrypted data
    """
    expanded_key = key_expansion(key)
    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))

    encrypted_data = []
    for i in range(block_count):
        block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
        encrypted_data += aes_encrypt(pkcs7_padding(block), expanded_key)

    return encrypted_data


def aes_ecb_decrypt(data, key, iv=None):
    """
    Decrypt with aes in ECB mode

    @param {int[]} data        cleartext
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          Unused for this mode
    @returns {int[]}           decrypted data
    """
    expanded_key = key_expansion(key)
    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))

    encrypted_data = []
    for i in range(block_count):
        block = data[i * BLOCK_SIZE_BYTES: (i + 1) * BLOCK_SIZE_BYTES]
        encrypted_data += aes_decrypt(block, expanded_key)
    encrypted_data = encrypted_data[:len(data)]

    return encrypted_data


def aes_ctr_decrypt(data, key, iv):
    """
    Decrypt with aes in counter mode

    @param {int[]} data        cipher
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          16-Byte initialization vector
    @returns {int[]}           decrypted data
    """
    return aes_ctr_encrypt(data, key, iv)


def aes_ctr_encrypt(data, key, iv):
    """
    Encrypt with aes in counter mode

    @param {int[]} data        cleartext
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          16-Byte initialization vector
    @returns {int[]}           encrypted data
    """
    expanded_key = key_expansion(key)
    block_count = int(ceil(float(len(data)) / BLOCK_SIZE_BYTES))
    counter = iter_vector(iv)

    encrypted_data = []
    for i in range(block_count):
        counter_block = next(counter)
        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)
        encrypted_data += xor(block, cipher_counter_block)
    encrypted_data = encrypted_data[:len(data)]

    return encrypted_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, *, padding_mode='pkcs7'):
    """
    Encrypt with aes in CBC mode

    @param {int[]} data        cleartext
    @param {int[]} key         16/24/32-Byte cipher key
    @param {int[]} iv          16-Byte IV
    @param padding_mode        Padding mode to use
    @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]
        block = pad_block(block, padding_mode)

        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 aes_gcm_decrypt_and_verify(data, key, tag, nonce):
    """
    Decrypt with aes in GBM mode and checks authenticity using tag

    @param {int[]} data        cipher
    @param {int[]} key         16-Byte cipher key
    @param {int[]} tag         authentication tag
    @param {int[]} nonce       IV (recommended 12-Byte)
    @returns {int[]}           decrypted data
    """

    # XXX: check aes, gcm param

    hash_subkey = aes_encrypt([0] * BLOCK_SIZE_BYTES, key_expansion(key))

    if len(nonce) == 12:
        j0 = nonce + [0, 0, 0, 1]
    else:
        fill = (BLOCK_SIZE_BYTES - (len(nonce) % BLOCK_SIZE_BYTES)) % BLOCK_SIZE_BYTES + 8
        ghash_in = nonce + [0] * fill + bytes_to_intlist((8 * len(nonce)).to_bytes(8, 'big'))
        j0 = ghash(hash_subkey, ghash_in)

    # TODO: add nonce support to aes_ctr_decrypt

    # nonce_ctr = j0[:12]
    iv_ctr = inc(j0)

    decrypted_data = aes_ctr_decrypt(data, key, iv_ctr + [0] * (BLOCK_SIZE_BYTES - len(iv_ctr)))
    pad_len = len(data) // 16 * 16
    s_tag = ghash(
        hash_subkey,
        data
        + [0] * (BLOCK_SIZE_BYTES - len(data) + pad_len)        # pad
        + bytes_to_intlist((0 * 8).to_bytes(8, 'big')           # length of associated data
                           + ((len(data) * 8).to_bytes(8, 'big')))  # length of data
    )

    if tag != aes_ctr_encrypt(s_tag, key, j0):
        raise ValueError("Mismatching authentication tag")

    return decrypted_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 = list(iter_mix_columns(data, MIX_COLUMN_MATRIX))
        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 = list(iter_mix_columns(data, MIX_COLUMN_MATRIX_INV))
        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(base64.b64decode(data))
    password = bytes_to_intlist(password.encode())

    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:]

    decrypted_data = aes_ctr_decrypt(cipher, key, nonce + [0] * (BLOCK_SIZE_BYTES - NONCE_LENGTH_BYTES))
    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 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 iter_vector(iv):
    while True:
        yield iv
        iv = inc(iv)


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 iter_mix_columns(data, matrix):
    for i in (0, 4, 8, 12):
        for row in matrix:
            mixed = 0
            for j in range(4):
                # xor is (+) and (-)
                mixed ^= (0 if data[i:i + 4][j] == 0 or row[j] == 0 else
                          RIJNDAEL_EXP_TABLE[(RIJNDAEL_LOG_TABLE[data[i + j]] + RIJNDAEL_LOG_TABLE[row[j]]) % 0xFF])
            yield mixed


def shift_rows(data):
    return [data[((column + row) & 0b11) * 4 + row] for column in range(4) for row in range(4)]


def shift_rows_inv(data):
    return [data[((column - row) & 0b11) * 4 + row] for column in range(4) for row in range(4)]


def shift_block(data):
    data_shifted = []

    bit = 0
    for n in data:
        if bit:
            n |= 0x100
        bit = n & 1
        n >>= 1
        data_shifted.append(n)

    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


def block_product(block_x, block_y):
    # NIST SP 800-38D, Algorithm 1

    if len(block_x) != BLOCK_SIZE_BYTES or len(block_y) != BLOCK_SIZE_BYTES:
        raise ValueError("Length of blocks need to be %d bytes" % BLOCK_SIZE_BYTES)

    block_r = [0xE1] + [0] * (BLOCK_SIZE_BYTES - 1)
    block_v = block_y[:]
    block_z = [0] * BLOCK_SIZE_BYTES

    for i in block_x:
        for bit in range(7, -1, -1):
            if i & (1 << bit):
                block_z = xor(block_z, block_v)

            do_xor = block_v[-1] & 1
            block_v = shift_block(block_v)
            if do_xor:
                block_v = xor(block_v, block_r)

    return block_z


def ghash(subkey, data):
    # NIST SP 800-38D, Algorithm 2

    if len(data) % BLOCK_SIZE_BYTES:
        raise ValueError("Length of data should be %d bytes" % BLOCK_SIZE_BYTES)

    last_y = [0] * BLOCK_SIZE_BYTES
    for i in range(0, len(data), BLOCK_SIZE_BYTES):
        block = data[i: i + BLOCK_SIZE_BYTES]
        last_y = block_product(xor(last_y, block), subkey)

    return last_y


__all__ = [
    'aes_cbc_decrypt',
    'aes_cbc_decrypt_bytes',
    'aes_ctr_decrypt',
    'aes_decrypt_text',
    'aes_decrypt',
    'aes_ecb_decrypt',
    'aes_gcm_decrypt_and_verify',
    'aes_gcm_decrypt_and_verify_bytes',

    'aes_cbc_encrypt',
    'aes_cbc_encrypt_bytes',
    'aes_ctr_encrypt',
    'aes_ecb_encrypt',
    'aes_encrypt',

    'key_expansion',
    'pad_block',
    'pkcs7_padding',
    'unpad_pkcs7',
]