Spaces:
Running
Running
File size: 37,304 Bytes
ba2f5d6 |
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 |
# ===================================================================
#
# Copyright (c) 2015, Legrandin <[email protected]>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================
import unittest
from binascii import unhexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.SelfTest.loader import load_test_vectors_wycheproof
from Crypto.Util.py3compat import tobytes, bchr
from Crypto.Cipher import AES
from Crypto.Hash import SHAKE128
from Crypto.Util.strxor import strxor
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
class CcmTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 128)
def test_loopback_128(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_nonce(self):
# If not passed, the nonce is created randomly
cipher = AES.new(self.key_128, AES.MODE_CCM)
nonce1 = cipher.nonce
cipher = AES.new(self.key_128, AES.MODE_CCM)
nonce2 = cipher.nonce
self.assertEqual(len(nonce1), 11)
self.assertNotEqual(nonce1, nonce2)
cipher = AES.new(self.key_128, AES.MODE_CCM, self.nonce_96)
ct = cipher.encrypt(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertEqual(ct, cipher.encrypt(self.data))
def test_nonce_must_be_bytes(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
nonce=u'test12345678')
def test_nonce_length(self):
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=b"")
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=bchr(1) * 6)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=bchr(1) * 14)
for x in range(7, 13 + 1):
AES.new(self.key_128, AES.MODE_CCM, nonce=bchr(1) * x)
def test_block_size(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, AES.block_size)
def test_nonce_attribute(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, a 11 bytes long nonce is randomly generated
nonce1 = AES.new(self.key_128, AES.MODE_CCM).nonce
nonce2 = AES.new(self.key_128, AES.MODE_CCM).nonce
self.assertEqual(len(nonce1), 11)
self.assertNotEqual(nonce1, nonce2)
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
self.nonce_96, 7)
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
nonce=self.nonce_96, unknown=7)
# But some are only known by the base cipher
# (e.g. use_aesni consumed by the AES module)
AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
use_aesni=False)
def test_null_encryption_decryption(self):
for func in "encrypt", "decrypt":
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
result = getattr(cipher, func)(b"")
self.assertEqual(result, b"")
def test_either_encrypt_or_decrypt(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt(b"")
self.assertRaises(TypeError, cipher.encrypt, b"")
def test_data_must_be_bytes(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
def test_mac_len(self):
# Invalid MAC length
for mac_len in range(3, 17 + 1, 2):
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=self.nonce_96, mac_len=mac_len)
# Valid MAC length
for mac_len in range(4, 16 + 1, 2):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
mac_len=mac_len)
_, mac = cipher.encrypt_and_digest(self.data)
self.assertEqual(len(mac), mac_len)
# Default MAC length
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
_, mac = cipher.encrypt_and_digest(self.data)
self.assertEqual(len(mac), 16)
def test_invalid_mac(self):
from Crypto.Util.strxor import strxor_c
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data)
invalid_mac = strxor_c(mac, 0x01)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct,
invalid_mac)
def test_hex_mac(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.hexverify(mac_hex)
def test_longer_assoc_data_than_declared(self):
# More than zero
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=0)
self.assertRaises(ValueError, cipher.update, b"1")
# Too large
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=15)
self.assertRaises(ValueError, cipher.update, self.data)
def test_shorter_assoc_data_than_expected(self):
DATA_LEN = len(self.data)
# With plaintext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.encrypt, self.data)
# With empty plaintext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.digest)
# With ciphertext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.decrypt, self.data)
# With empty ciphertext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.verify, mac)
def test_shorter_and_longer_plaintext_than_declared(self):
DATA_LEN = len(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN + 1)
cipher.encrypt(self.data)
self.assertRaises(ValueError, cipher.digest)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN - 1)
self.assertRaises(ValueError, cipher.encrypt, self.data)
def test_shorter_ciphertext_than_declared(self):
DATA_LEN = len(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN + 1)
cipher.decrypt(ct)
self.assertRaises(ValueError, cipher.verify, mac)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN - 1)
self.assertRaises(ValueError, cipher.decrypt, ct)
def test_message_chunks(self):
# Validate that both associated data and plaintext/ciphertext
# can be broken up in chunks of arbitrary length
auth_data = get_tag_random("authenticated data", 127)
plaintext = get_tag_random("plaintext", 127)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(auth_data)
ciphertext, ref_mac = cipher.encrypt_and_digest(plaintext)
def break_up(data, chunk_length):
return [data[i:i+chunk_length] for i in range(0, len(data),
chunk_length)]
# Encryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=127, assoc_len=127)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
pt2 = b""
for chunk in break_up(ciphertext, chunk_length):
pt2 += cipher.decrypt(chunk)
self.assertEqual(plaintext, pt2)
cipher.verify(ref_mac)
# Decryption
for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=127, assoc_len=127)
for chunk in break_up(auth_data, chunk_length):
cipher.update(chunk)
ct2 = b""
for chunk in break_up(plaintext, chunk_length):
ct2 += cipher.encrypt(chunk)
self.assertEqual(ciphertext, ct2)
self.assertEqual(cipher.digest(), ref_mac)
def test_bytearray(self):
# Encrypt
key_ba = bytearray(self.key_128)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data)
data_ba = bytearray(self.data)
cipher1 = AES.new(self.key_128,
AES.MODE_CCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_ba,
AES.MODE_CCM,
nonce=nonce_ba)
key_ba[:3] = b"\xFF\xFF\xFF"
nonce_ba[:3] = b"\xFF\xFF\xFF"
cipher2.update(header_ba)
header_ba[:3] = b"\xFF\xFF\xFF"
ct_test = cipher2.encrypt(data_ba)
data_ba[:3] = b"\xFF\xFF\xFF"
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_ba = bytearray(self.key_128)
nonce_ba = bytearray(self.nonce_96)
header_ba = bytearray(self.data)
del data_ba
cipher4 = AES.new(key_ba,
AES.MODE_CCM,
nonce=nonce_ba)
key_ba[:3] = b"\xFF\xFF\xFF"
nonce_ba[:3] = b"\xFF\xFF\xFF"
cipher4.update(header_ba)
header_ba[:3] = b"\xFF\xFF\xFF"
pt_test = cipher4.decrypt_and_verify(bytearray(ct_test), bytearray(tag_test))
self.assertEqual(self.data, pt_test)
def test_memoryview(self):
# Encrypt
key_mv = memoryview(bytearray(self.key_128))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data))
data_mv = memoryview(bytearray(self.data))
cipher1 = AES.new(self.key_128,
AES.MODE_CCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_mv,
AES.MODE_CCM,
nonce=nonce_mv)
key_mv[:3] = b"\xFF\xFF\xFF"
nonce_mv[:3] = b"\xFF\xFF\xFF"
cipher2.update(header_mv)
header_mv[:3] = b"\xFF\xFF\xFF"
ct_test = cipher2.encrypt(data_mv)
data_mv[:3] = b"\xFF\xFF\xFF"
tag_test = cipher2.digest()
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key_mv = memoryview(bytearray(self.key_128))
nonce_mv = memoryview(bytearray(self.nonce_96))
header_mv = memoryview(bytearray(self.data))
del data_mv
cipher4 = AES.new(key_mv,
AES.MODE_CCM,
nonce=nonce_mv)
key_mv[:3] = b"\xFF\xFF\xFF"
nonce_mv[:3] = b"\xFF\xFF\xFF"
cipher4.update(header_mv)
header_mv[:3] = b"\xFF\xFF\xFF"
pt_test = cipher4.decrypt_and_verify(memoryview(ct_test), memoryview(tag_test))
self.assertEqual(self.data, pt_test)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
tag = cipher.digest()
output = bytearray(128)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
res = cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
res = cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
res, tag_out = cipher.encrypt_and_digest(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
self.assertEqual(tag, tag_out)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
res = cipher.decrypt_and_verify(ct, tag, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
def test_output_param_memoryview(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
output = memoryview(bytearray(128))
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
pt = b'5' * 16
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16)
shorter_output = bytearray(15)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
class CcmFSMTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 16)
def test_valid_init_encrypt_decrypt_digest_verify(self):
# No authenticated data, fixed plaintext
for assoc_len in (None, 0):
for msg_len in (None, len(self.data)):
# Verify path INIT->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_update_digest_verify(self):
# No plaintext, fixed authenticated data
for assoc_len in (None, len(self.data)):
for msg_len in (None, 0):
# Verify path INIT->UPDATE->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
cipher.verify(mac)
def test_valid_full_path(self):
# Fixed authenticated data, fixed plaintext
for assoc_len in (None, len(self.data)):
for msg_len in (None, len(self.data)):
# Verify path INIT->UPDATE->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.verify(mac)
def test_valid_multiple_encrypt_or_decrypt(self):
# Only possible if msg_len is declared in advance
for method_name in "encrypt", "decrypt":
for auth_data in (None, b"333", self.data,
self.data + b"3"):
if auth_data is None:
assoc_len = None
else:
assoc_len = len(auth_data)
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
msg_len=64,
assoc_len=assoc_len)
if auth_data is not None:
cipher.update(auth_data)
method = getattr(cipher, method_name)
method(self.data)
method(self.data)
method(self.data)
method(self.data)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
first_mac = cipher.digest()
for x in range(4):
self.assertEqual(first_mac, cipher.digest())
# Multiple calls to verify
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
for x in range(5):
cipher.verify(first_mac)
def test_valid_encrypt_and_digest_decrypt_and_verify(self):
# encrypt_and_digest
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
ct, mac = cipher.encrypt_and_digest(self.data)
# decrypt_and_verify
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
pt = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(self.data, pt)
def test_invalid_multiple_encrypt_decrypt_without_msg_len(self):
# Once per method, with or without assoc. data
for method_name in "encrypt", "decrypt":
for assoc_data_present in (True, False):
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96)
if assoc_data_present:
cipher.update(self.data)
method = getattr(cipher, method_name)
method(self.data)
self.assertRaises(TypeError, method, self.data)
def test_invalid_mixing_encrypt_decrypt(self):
# Once per method, with or without assoc. data
for method1_name, method2_name in (("encrypt", "decrypt"),
("decrypt", "encrypt")):
for assoc_data_present in (True, False):
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
msg_len=32)
if assoc_data_present:
cipher.update(self.data)
getattr(cipher, method1_name)(self.data)
self.assertRaises(TypeError, getattr(cipher, method2_name),
self.data)
def test_invalid_encrypt_or_update_after_digest(self):
for method_name in "encrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.encrypt(self.data)
cipher.digest()
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data)
def test_invalid_decrypt_or_update_after_verify(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
for method_name in "decrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
class TestVectors(unittest.TestCase):
"""Class exercising the CCM test vectors found in Appendix C
of NIST SP 800-38C and in RFC 3610"""
# List of test vectors, each made up of:
# - authenticated data
# - plaintext
# - ciphertext
# - MAC
# - AES key
# - nonce
test_vectors_hex = [
# NIST SP 800 38C
( '0001020304050607',
'20212223',
'7162015b',
'4dac255d',
'404142434445464748494a4b4c4d4e4f',
'10111213141516'),
( '000102030405060708090a0b0c0d0e0f',
'202122232425262728292a2b2c2d2e2f',
'd2a1f0e051ea5f62081a7792073d593d',
'1fc64fbfaccd',
'404142434445464748494a4b4c4d4e4f',
'1011121314151617'),
( '000102030405060708090a0b0c0d0e0f10111213',
'202122232425262728292a2b2c2d2e2f3031323334353637',
'e3b201a9f5b71a7a9b1ceaeccd97e70b6176aad9a4428aa5',
'484392fbc1b09951',
'404142434445464748494a4b4c4d4e4f',
'101112131415161718191a1b'),
( (''.join(["%02X" % (x*16+y) for x in range(0,16) for y in range(0,16)]))*256,
'202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f',
'69915dad1e84c6376a68c2967e4dab615ae0fd1faec44cc484828529463ccf72',
'b4ac6bec93e8598e7f0dadbcea5b',
'404142434445464748494a4b4c4d4e4f',
'101112131415161718191a1b1c'),
# RFC3610
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e',
'588c979a61c663d2f066d0c2c0f989806d5f6b61dac384',
'17e8d12cfdf926e0',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000003020100a0a1a2a3a4a5'),
(
'0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
'72c91a36e135f8cf291ca894085c87e3cc15c439c9e43a3b',
'a091d56e10400916',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000004030201a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'51b1e5f44a197d1da46b0f8e2d282ae871e838bb64da859657',
'4adaa76fbd9fb0c5',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000005040302A0A1A2A3A4A5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e',
'a28c6865939a9a79faaa5c4c2a9d4a91cdac8c',
'96c861b9c9e61ef1',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000006050403a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f',
'dcf1fb7b5d9e23fb9d4e131253658ad86ebdca3e',
'51e83f077d9c2d93',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000007060504a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'6fc1b011f006568b5171a42d953d469b2570a4bd87',
'405a0443ac91cb94',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000008070605a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e',
'0135d1b2c95f41d5d1d4fec185d166b8094e999dfed96c',
'048c56602c97acbb7490',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000009080706a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
'7b75399ac0831dd2f0bbd75879a2fd8f6cae6b6cd9b7db24',
'c17b4433f434963f34b4',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000a090807a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'82531a60cc24945a4b8279181ab5c84df21ce7f9b73f42e197',
'ea9c07e56b5eb17e5f4e',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000b0a0908a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e',
'07342594157785152b074098330abb141b947b',
'566aa9406b4d999988dd',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000c0b0a09a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f',
'676bb20380b0e301e8ab79590a396da78b834934',
'f53aa2e9107a8b6c022c',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000d0c0b0aa0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'c0ffa0d6f05bdb67f24d43a4338d2aa4bed7b20e43',
'cd1aa31662e7ad65d6db',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000e0d0c0ba0a1a2a3a4a5'),
( '0be1a88bace018b1',
'08e8cf97d820ea258460e96ad9cf5289054d895ceac47c',
'4cb97f86a2a4689a877947ab8091ef5386a6ffbdd080f8',
'e78cf7cb0cddd7b3',
'd7828d13b2b0bdc325a76236df93cc6b',
'00412b4ea9cdbe3c9696766cfa'),
( '63018f76dc8a1bcb',
'9020ea6f91bdd85afa0039ba4baff9bfb79c7028949cd0ec',
'4ccb1e7ca981befaa0726c55d378061298c85c92814abc33',
'c52ee81d7d77c08a',
'd7828d13b2b0bdc325a76236df93cc6b',
'0033568ef7b2633c9696766cfa'),
( 'aa6cfa36cae86b40',
'b916e0eacc1c00d7dcec68ec0b3bbb1a02de8a2d1aa346132e',
'b1d23a2220ddc0ac900d9aa03c61fcf4a559a4417767089708',
'a776796edb723506',
'd7828d13b2b0bdc325a76236df93cc6b',
'00103fe41336713c9696766cfa'),
( 'd0d0735c531e1becf049c244',
'12daac5630efa5396f770ce1a66b21f7b2101c',
'14d253c3967b70609b7cbb7c49916028324526',
'9a6f49975bcadeaf',
'd7828d13b2b0bdc325a76236df93cc6b',
'00764c63b8058e3c9696766cfa'),
( '77b60f011c03e1525899bcae',
'e88b6a46c78d63e52eb8c546efb5de6f75e9cc0d',
'5545ff1a085ee2efbf52b2e04bee1e2336c73e3f',
'762c0c7744fe7e3c',
'd7828d13b2b0bdc325a76236df93cc6b',
'00f8b678094e3b3c9696766cfa'),
( 'cd9044d2b71fdb8120ea60c0',
'6435acbafb11a82e2f071d7ca4a5ebd93a803ba87f',
'009769ecabdf48625594c59251e6035722675e04c8',
'47099e5ae0704551',
'd7828d13b2b0bdc325a76236df93cc6b',
'00d560912d3f703c9696766cfa'),
( 'd85bc7e69f944fb8',
'8a19b950bcf71a018e5e6701c91787659809d67dbedd18',
'bc218daa947427b6db386a99ac1aef23ade0b52939cb6a',
'637cf9bec2408897c6ba',
'd7828d13b2b0bdc325a76236df93cc6b',
'0042fff8f1951c3c9696766cfa'),
( '74a0ebc9069f5b37',
'1761433c37c5a35fc1f39f406302eb907c6163be38c98437',
'5810e6fd25874022e80361a478e3e9cf484ab04f447efff6',
'f0a477cc2fc9bf548944',
'd7828d13b2b0bdc325a76236df93cc6b',
'00920f40e56cdc3c9696766cfa'),
( '44a3aa3aae6475ca',
'a434a8e58500c6e41530538862d686ea9e81301b5ae4226bfa',
'f2beed7bc5098e83feb5b31608f8e29c38819a89c8e776f154',
'4d4151a4ed3a8b87b9ce',
'd7828d13b2b0bdc325a76236df93cc6b',
'0027ca0c7120bc3c9696766cfa'),
( 'ec46bb63b02520c33c49fd70',
'b96b49e21d621741632875db7f6c9243d2d7c2',
'31d750a09da3ed7fddd49a2032aabf17ec8ebf',
'7d22c8088c666be5c197',
'd7828d13b2b0bdc325a76236df93cc6b',
'005b8ccbcd9af83c9696766cfa'),
( '47a65ac78b3d594227e85e71',
'e2fcfbb880442c731bf95167c8ffd7895e337076',
'e882f1dbd38ce3eda7c23f04dd65071eb41342ac',
'df7e00dccec7ae52987d',
'd7828d13b2b0bdc325a76236df93cc6b',
'003ebe94044b9a3c9696766cfa'),
( '6e37a6ef546d955d34ab6059',
'abf21c0b02feb88f856df4a37381bce3cc128517d4',
'f32905b88a641b04b9c9ffb58cc390900f3da12ab1',
'6dce9e82efa16da62059',
'd7828d13b2b0bdc325a76236df93cc6b',
'008d493b30ae8b3c9696766cfa'),
]
test_vectors = [[unhexlify(x) for x in tv] for tv in test_vectors_hex]
def runTest(self):
for assoc_data, pt, ct, mac, key, nonce in self.test_vectors:
# Encrypt
cipher = AES.new(key, AES.MODE_CCM, nonce, mac_len=len(mac))
cipher.update(assoc_data)
ct2, mac2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(mac, mac2)
# Decrypt
cipher = AES.new(key, AES.MODE_CCM, nonce, mac_len=len(mac))
cipher.update(assoc_data)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
class TestVectorsWycheproof(unittest.TestCase):
def __init__(self, wycheproof_warnings, **extra_params):
unittest.TestCase.__init__(self)
self._wycheproof_warnings = wycheproof_warnings
self._extra_params = extra_params
self._id = "None"
def setUp(self):
def filter_tag(group):
return group['tagSize'] // 8
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aes_ccm_test.json",
"Wycheproof AES CCM",
group_tag={'tag_size': filter_tag})
def shortDescription(self):
return self._id
def warn(self, tv):
if tv.warning and self._wycheproof_warnings:
import warnings
warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment))
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt CCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e):
assert not tv.valid
return
if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e):
assert not tv.valid
return
raise e
cipher.update(tv.aad)
ct, tag = cipher.encrypt_and_digest(tv.msg)
if tv.valid:
self.assertEqual(ct, tv.ct)
self.assertEqual(tag, tv.tag)
self.warn(tv)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt CCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e):
assert not tv.valid
return
if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e):
assert not tv.valid
return
raise e
cipher.update(tv.aad)
try:
pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
except ValueError:
assert not tv.valid
else:
assert tv.valid
self.assertEqual(pt, tv.msg)
self.warn(tv)
def test_corrupt_decrypt(self, tv):
self._id = "Wycheproof Corrupt Decrypt CCM Test #" + str(tv.id)
if len(tv.iv) not in range(7, 13 + 1, 2) or len(tv.ct) == 0:
return
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
cipher.update(tv.aad)
ct_corrupt = strxor(tv.ct, b"\x00" * (len(tv.ct) - 1) + b"\x01")
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct_corrupt, tv.tag)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
self.test_corrupt_decrypt(tv)
def get_tests(config={}):
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(CcmTests)
tests += list_test_cases(CcmFSMTests)
tests += [TestVectors()]
tests += [TestVectorsWycheproof(wycheproof_warnings)]
return tests
if __name__ == '__main__':
def suite():
unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
|