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| # =================================================================== | |
| # | |
| # Copyright (c) 2014, Legrandin <helderijs@gmail.com> | |
| # 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.Util.py3compat import b, tobytes, bchr | |
| from Crypto.Util.number import long_to_bytes | |
| from Crypto.SelfTest.loader import load_test_vectors | |
| from Crypto.SelfTest.st_common import list_test_cases | |
| from Crypto.Cipher import AES | |
| from Crypto.Hash import SHAKE128 | |
| def get_tag_random(tag, length): | |
| return SHAKE128.new(data=tobytes(tag)).read(length) | |
| class OcbTests(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_OCB, nonce=self.nonce_96) | |
| pt = get_tag_random("plaintext", 16 * 100) | |
| ct, mac = cipher.encrypt_and_digest(pt) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| pt2 = cipher.decrypt_and_verify(ct, mac) | |
| self.assertEqual(pt, pt2) | |
| def test_nonce(self): | |
| # Nonce is optional | |
| AES.new(self.key_128, AES.MODE_OCB) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, self.nonce_96) | |
| ct = cipher.encrypt(self.data) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, 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_OCB, | |
| nonce=u'test12345678') | |
| def test_nonce_length(self): | |
| # nonce cannot be empty | |
| self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB, | |
| nonce=b("")) | |
| # nonce can be up to 15 bytes long | |
| for length in range(1, 16): | |
| AES.new(self.key_128, AES.MODE_OCB, nonce=self.data[:length]) | |
| self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB, | |
| nonce=self.data) | |
| def test_block_size_128(self): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| self.assertEqual(cipher.block_size, AES.block_size) | |
| # By default, a 15 bytes long nonce is randomly generated | |
| nonce1 = AES.new(self.key_128, AES.MODE_OCB).nonce | |
| nonce2 = AES.new(self.key_128, AES.MODE_OCB).nonce | |
| self.assertEqual(len(nonce1), 15) | |
| self.assertNotEqual(nonce1, nonce2) | |
| def test_nonce_attribute(self): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| self.assertEqual(cipher.nonce, self.nonce_96) | |
| # By default, a 15 bytes long nonce is randomly generated | |
| nonce1 = AES.new(self.key_128, AES.MODE_OCB).nonce | |
| nonce2 = AES.new(self.key_128, AES.MODE_OCB).nonce | |
| self.assertEqual(len(nonce1), 15) | |
| self.assertNotEqual(nonce1, nonce2) | |
| def test_unknown_parameters(self): | |
| self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_OCB, | |
| self.nonce_96, 7) | |
| self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_OCB, | |
| 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_OCB, 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_OCB, 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_OCB, nonce=self.nonce_96) | |
| cipher.encrypt(b("xyz")) | |
| self.assertRaises(TypeError, cipher.decrypt, b("xyz")) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.decrypt(b("xyz")) | |
| self.assertRaises(TypeError, cipher.encrypt, b("xyz")) | |
| def test_data_must_be_bytes(self): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*') | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*') | |
| def test_mac_len(self): | |
| # Invalid MAC length | |
| self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96, mac_len=7) | |
| self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96, mac_len=16+1) | |
| # Valid MAC length | |
| for mac_len in range(8, 16 + 1): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, 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_OCB, 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_OCB, 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_OCB, 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_OCB, nonce=self.nonce_96) | |
| mac_hex = cipher.hexdigest() | |
| self.assertEqual(cipher.digest(), unhexlify(mac_hex)) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.hexverify(mac_hex) | |
| 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_OCB, 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_OCB, nonce=self.nonce_96) | |
| 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) | |
| pt2 += cipher.decrypt() | |
| 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_OCB, nonce=self.nonce_96) | |
| 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) | |
| ct2 += cipher.encrypt() | |
| 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_OCB, | |
| nonce=self.nonce_96) | |
| cipher1.update(self.data) | |
| ct = cipher1.encrypt(self.data) + cipher1.encrypt() | |
| tag = cipher1.digest() | |
| cipher2 = AES.new(key_ba, | |
| AES.MODE_OCB, | |
| 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) + cipher2.encrypt() | |
| 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_OCB, | |
| 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_OCB, | |
| nonce=self.nonce_96) | |
| cipher1.update(self.data) | |
| ct = cipher1.encrypt(self.data) + cipher1.encrypt() | |
| tag = cipher1.digest() | |
| cipher2 = AES.new(key_mv, | |
| AES.MODE_OCB, | |
| 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) + cipher2.encrypt() | |
| 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_OCB, | |
| 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) | |
| class OcbFSMTests(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_valid_init_encrypt_decrypt_digest_verify(self): | |
| # No authenticated data, fixed plaintext | |
| # Verify path INIT->ENCRYPT->ENCRYPT(NONE)->DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| ct = cipher.encrypt(self.data) | |
| ct += cipher.encrypt() | |
| mac = cipher.digest() | |
| # Verify path INIT->DECRYPT->DECRYPT(NONCE)->VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.decrypt(ct) | |
| cipher.decrypt() | |
| cipher.verify(mac) | |
| def test_invalid_init_encrypt_decrypt_digest_verify(self): | |
| # No authenticated data, fixed plaintext | |
| # Verify path INIT->ENCRYPT->DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| ct = cipher.encrypt(self.data) | |
| self.assertRaises(TypeError, cipher.digest) | |
| # Verify path INIT->DECRYPT->VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.decrypt(ct) | |
| self.assertRaises(TypeError, cipher.verify) | |
| def test_valid_init_update_digest_verify(self): | |
| # No plaintext, fixed authenticated data | |
| # Verify path INIT->UPDATE->DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| mac = cipher.digest() | |
| # Verify path INIT->UPDATE->VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| cipher.verify(mac) | |
| def test_valid_full_path(self): | |
| # Fixed authenticated data, fixed plaintext | |
| # Verify path INIT->UPDATE->ENCRYPT->ENCRYPT(NONE)->DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| ct = cipher.encrypt(self.data) | |
| ct += cipher.encrypt() | |
| mac = cipher.digest() | |
| # Verify path INIT->UPDATE->DECRYPT->DECRYPT(NONE)->VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| cipher.decrypt(ct) | |
| cipher.decrypt() | |
| cipher.verify(mac) | |
| # Verify path INIT->UPDATE->ENCRYPT->ENCRYPT_AND_DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| ct1 = cipher.encrypt(self.data[:2]) | |
| ct2, mac = cipher.encrypt_and_digest(self.data[2:]) | |
| # Verify path INIT->UPDATE->DECRYPT->DECRYPT_AND_VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| cipher.decrypt(ct1) | |
| cipher.decrypt_and_verify(ct2, mac) | |
| def test_invalid_encrypt_after_final(self): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| cipher.encrypt(self.data) | |
| cipher.encrypt() | |
| self.assertRaises(TypeError, cipher.encrypt, self.data) | |
| def test_invalid_decrypt_after_final(self): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| cipher.decrypt(self.data) | |
| cipher.decrypt() | |
| self.assertRaises(TypeError, cipher.decrypt, self.data) | |
| def test_valid_init_digest(self): | |
| # Verify path INIT->DIGEST | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.digest() | |
| def test_valid_init_verify(self): | |
| # Verify path INIT->VERIFY | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| mac = cipher.digest() | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.verify(mac) | |
| def test_valid_multiple_encrypt_or_decrypt(self): | |
| for method_name in "encrypt", "decrypt": | |
| for auth_data in (None, b("333"), self.data, | |
| self.data + b("3")): | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, | |
| nonce=self.nonce_96) | |
| 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) | |
| method() | |
| def test_valid_multiple_digest_or_verify(self): | |
| # Multiple calls to digest | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, 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_OCB, 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_OCB, 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_OCB, nonce=self.nonce_96) | |
| cipher.update(self.data) | |
| pt = cipher.decrypt_and_verify(ct, mac) | |
| self.assertEqual(self.data, pt) | |
| 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_OCB, | |
| nonce=self.nonce_96) | |
| 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_OCB, nonce=self.nonce_96) | |
| cipher.encrypt(self.data) | |
| cipher.encrypt() | |
| cipher.digest() | |
| self.assertRaises(TypeError, getattr(cipher, method_name), | |
| self.data) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, 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_OCB, nonce=self.nonce_96) | |
| ct = cipher.encrypt(self.data) | |
| ct += cipher.encrypt() | |
| mac = cipher.digest() | |
| for method_name in "decrypt", "update": | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.decrypt(ct) | |
| cipher.decrypt() | |
| cipher.verify(mac) | |
| self.assertRaises(TypeError, getattr(cipher, method_name), | |
| self.data) | |
| cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96) | |
| cipher.decrypt_and_verify(ct, mac) | |
| self.assertRaises(TypeError, getattr(cipher, method_name), | |
| self.data) | |
| def algo_rfc7253(keylen, taglen, noncelen): | |
| """Implement the algorithm at page 18 of RFC 7253""" | |
| key = bchr(0) * (keylen // 8 - 1) + bchr(taglen) | |
| C = b"" | |
| for i in range(128): | |
| S = bchr(0) * i | |
| N = long_to_bytes(3 * i + 1, noncelen // 8) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=N, mac_len=taglen // 8) | |
| cipher.update(S) | |
| C += cipher.encrypt(S) + cipher.encrypt() + cipher.digest() | |
| N = long_to_bytes(3 * i + 2, noncelen // 8) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=N, mac_len=taglen // 8) | |
| C += cipher.encrypt(S) + cipher.encrypt() + cipher.digest() | |
| N = long_to_bytes(3 * i + 3, noncelen // 8) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=N, mac_len=taglen // 8) | |
| cipher.update(S) | |
| C += cipher.encrypt() + cipher.digest() | |
| N = long_to_bytes(385, noncelen // 8) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=N, mac_len=taglen // 8) | |
| cipher.update(C) | |
| return cipher.encrypt() + cipher.digest() | |
| class OcbRfc7253Test(unittest.TestCase): | |
| # Tuple with | |
| # - nonce | |
| # - authenticated data | |
| # - plaintext | |
| # - ciphertext and 16 byte MAC tag | |
| tv1_key = "000102030405060708090A0B0C0D0E0F" | |
| tv1 = ( | |
| ( | |
| "BBAA99887766554433221100", | |
| "", | |
| "", | |
| "785407BFFFC8AD9EDCC5520AC9111EE6" | |
| ), | |
| ( | |
| "BBAA99887766554433221101", | |
| "0001020304050607", | |
| "0001020304050607", | |
| "6820B3657B6F615A5725BDA0D3B4EB3A257C9AF1F8F03009" | |
| ), | |
| ( | |
| "BBAA99887766554433221102", | |
| "0001020304050607", | |
| "", | |
| "81017F8203F081277152FADE694A0A00" | |
| ), | |
| ( | |
| "BBAA99887766554433221103", | |
| "", | |
| "0001020304050607", | |
| "45DD69F8F5AAE72414054CD1F35D82760B2CD00D2F99BFA9" | |
| ), | |
| ( | |
| "BBAA99887766554433221104", | |
| "000102030405060708090A0B0C0D0E0F", | |
| "000102030405060708090A0B0C0D0E0F", | |
| "571D535B60B277188BE5147170A9A22C3AD7A4FF3835B8C5" | |
| "701C1CCEC8FC3358" | |
| ), | |
| ( | |
| "BBAA99887766554433221105", | |
| "000102030405060708090A0B0C0D0E0F", | |
| "", | |
| "8CF761B6902EF764462AD86498CA6B97" | |
| ), | |
| ( | |
| "BBAA99887766554433221106", | |
| "", | |
| "000102030405060708090A0B0C0D0E0F", | |
| "5CE88EC2E0692706A915C00AEB8B2396F40E1C743F52436B" | |
| "DF06D8FA1ECA343D" | |
| ), | |
| ( | |
| "BBAA99887766554433221107", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617", | |
| "1CA2207308C87C010756104D8840CE1952F09673A448A122" | |
| "C92C62241051F57356D7F3C90BB0E07F" | |
| ), | |
| ( | |
| "BBAA99887766554433221108", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617", | |
| "", | |
| "6DC225A071FC1B9F7C69F93B0F1E10DE" | |
| ), | |
| ( | |
| "BBAA99887766554433221109", | |
| "", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617", | |
| "221BD0DE7FA6FE993ECCD769460A0AF2D6CDED0C395B1C3C" | |
| "E725F32494B9F914D85C0B1EB38357FF" | |
| ), | |
| ( | |
| "BBAA9988776655443322110A", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F", | |
| "BD6F6C496201C69296C11EFD138A467ABD3C707924B964DE" | |
| "AFFC40319AF5A48540FBBA186C5553C68AD9F592A79A4240" | |
| ), | |
| ( | |
| "BBAA9988776655443322110B", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F", | |
| "", | |
| "FE80690BEE8A485D11F32965BC9D2A32" | |
| ), | |
| ( | |
| "BBAA9988776655443322110C", | |
| "", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F", | |
| "2942BFC773BDA23CABC6ACFD9BFD5835BD300F0973792EF4" | |
| "6040C53F1432BCDFB5E1DDE3BC18A5F840B52E653444D5DF" | |
| ), | |
| ( | |
| "BBAA9988776655443322110D", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "D5CA91748410C1751FF8A2F618255B68A0A12E093FF45460" | |
| "6E59F9C1D0DDC54B65E8628E568BAD7AED07BA06A4A69483" | |
| "A7035490C5769E60" | |
| ), | |
| ( | |
| "BBAA9988776655443322110E", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "", | |
| "C5CD9D1850C141E358649994EE701B68" | |
| ), | |
| ( | |
| "BBAA9988776655443322110F", | |
| "", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "4412923493C57D5DE0D700F753CCE0D1D2D95060122E9F15" | |
| "A5DDBFC5787E50B5CC55EE507BCB084E479AD363AC366B95" | |
| "A98CA5F3000B1479" | |
| ) | |
| ) | |
| # Tuple with | |
| # - key | |
| # - nonce | |
| # - authenticated data | |
| # - plaintext | |
| # - ciphertext and 12 byte MAC tag | |
| tv2 = ( | |
| "0F0E0D0C0B0A09080706050403020100", | |
| "BBAA9988776655443322110D", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627", | |
| "1792A4E31E0755FB03E31B22116E6C2DDF9EFD6E33D536F1" | |
| "A0124B0A55BAE884ED93481529C76B6AD0C515F4D1CDD4FD" | |
| "AC4F02AA" | |
| ) | |
| # Tuple with | |
| # - key length | |
| # - MAC tag length | |
| # - Expected output | |
| tv3 = ( | |
| (128, 128, "67E944D23256C5E0B6C61FA22FDF1EA2"), | |
| (192, 128, "F673F2C3E7174AAE7BAE986CA9F29E17"), | |
| (256, 128, "D90EB8E9C977C88B79DD793D7FFA161C"), | |
| (128, 96, "77A3D8E73589158D25D01209"), | |
| (192, 96, "05D56EAD2752C86BE6932C5E"), | |
| (256, 96, "5458359AC23B0CBA9E6330DD"), | |
| (128, 64, "192C9B7BD90BA06A"), | |
| (192, 64, "0066BC6E0EF34E24"), | |
| (256, 64, "7D4EA5D445501CBE"), | |
| ) | |
| def test1(self): | |
| key = unhexlify(b(self.tv1_key)) | |
| for tv in self.tv1: | |
| nonce, aad, pt, ct = [unhexlify(b(x)) for x in tv] | |
| ct, mac_tag = ct[:-16], ct[-16:] | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=nonce) | |
| cipher.update(aad) | |
| ct2 = cipher.encrypt(pt) + cipher.encrypt() | |
| self.assertEqual(ct, ct2) | |
| self.assertEqual(mac_tag, cipher.digest()) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=nonce) | |
| cipher.update(aad) | |
| pt2 = cipher.decrypt(ct) + cipher.decrypt() | |
| self.assertEqual(pt, pt2) | |
| cipher.verify(mac_tag) | |
| def test2(self): | |
| key, nonce, aad, pt, ct = [unhexlify(b(x)) for x in self.tv2] | |
| ct, mac_tag = ct[:-12], ct[-12:] | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=nonce, mac_len=12) | |
| cipher.update(aad) | |
| ct2 = cipher.encrypt(pt) + cipher.encrypt() | |
| self.assertEqual(ct, ct2) | |
| self.assertEqual(mac_tag, cipher.digest()) | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=nonce, mac_len=12) | |
| cipher.update(aad) | |
| pt2 = cipher.decrypt(ct) + cipher.decrypt() | |
| self.assertEqual(pt, pt2) | |
| cipher.verify(mac_tag) | |
| def test3(self): | |
| for keylen, taglen, result in self.tv3: | |
| result2 = algo_rfc7253(keylen, taglen, 96) | |
| self.assertEqual(unhexlify(b(result)), result2) | |
| class OcbDkgTest(unittest.TestCase): | |
| """Test vectors from https://gitlab.com/dkg/ocb-test-vectors""" | |
| def test_1_2(self): | |
| tvs = [] | |
| for fi in (1, 2): | |
| for nb in (104, 112, 120): | |
| tv_file = load_test_vectors(("Cipher", "AES"), | |
| "test-vector-%d-nonce%d.txt" % (fi, nb), | |
| "DKG tests, %d, %d bits" % (fi, nb), | |
| {}) | |
| if tv_file is None: | |
| break | |
| key = tv_file[0].k | |
| for tv in tv_file[1:]: | |
| tv.k = key | |
| tvs.append(tv) | |
| for tv in tvs: | |
| k, n, a, p, c = tv.k, tv.n, tv.a, tv.p, tv.c | |
| mac_len = len(c) - len(p) | |
| cipher = AES.new(k, AES.MODE_OCB, nonce=n, mac_len=mac_len) | |
| cipher.update(a) | |
| c_out, tag_out = cipher.encrypt_and_digest(p) | |
| self.assertEqual(c, c_out + tag_out) | |
| def test_3(self): | |
| def check(keylen, taglen, noncelen, exp): | |
| result = algo_rfc7253(keylen, taglen, noncelen) | |
| self.assertEqual(result, unhexlify(exp)) | |
| # test-vector-3-nonce104.txt | |
| check(128, 128, 104, "C47F5F0341E15326D4D1C46F47F05062") | |
| check(192, 128, 104, "95B9167A38EB80495DFC561A8486E109") | |
| check(256, 128, 104, "AFE1CDDB97028FD92F8FB3C8CFBA7D83") | |
| check(128, 96, 104, "F471B4983BA80946DF217A54") | |
| check(192, 96, 104, "5AE828BC51C24D85FA5CC7B2") | |
| check(256, 96, 104, "8C8335982E2B734616CAD14C") | |
| check(128, 64, 104, "B553F74B85FD1E5B") | |
| check(192, 64, 104, "3B49D20E513531F9") | |
| check(256, 64, 104, "ED6DA5B1216BF8BB") | |
| # test-vector-3-nonce112.txt | |
| check(128, 128, 112, "CA8AFCA031BAC3F480A583BD6C50A547") | |
| check(192, 128, 112, "D170C1DF356308079DA9A3F619147148") | |
| check(256, 128, 112, "57F94381F2F9231EFB04AECD323757C3") | |
| check(128, 96, 112, "3A618B2531ED39F260C750DC") | |
| check(192, 96, 112, "9071EB89FEDBADDA88FD286E") | |
| check(256, 96, 112, "FDF0EFB97F21A39AC4BAB5AC") | |
| check(128, 64, 112, "FAB2FF3A8DD82A13") | |
| check(192, 64, 112, "AC01D912BD0737D3") | |
| check(256, 64, 112, "9D1FD0B500EA4ECF") | |
| # test-vector-3-nonce120.txt | |
| check(128, 128, 120, "9E043A7140A25FB91F43BCC9DD7E0F46") | |
| check(192, 128, 120, "680000E53908323A7F396B955B8EC641") | |
| check(256, 128, 120, "8304B97FAACDA56E676602E1878A7E6F") | |
| check(128, 96, 120, "81F978AC9867E825D339847D") | |
| check(192, 96, 120, "EFCF2D60B24926ADA48CF5B1") | |
| check(256, 96, 120, "84961DC56E917B165E58C174") | |
| check(128, 64, 120, "227AEE6C9D905A61") | |
| check(192, 64, 120, "541DE691B9E1A2F9") | |
| check(256, 64, 120, "B0E761381C7129FC") | |
| def test_2_bugfix(self): | |
| nonce = unhexlify("EEDDCCBBAA9988776655443322110D") | |
| key = unhexlify("0F0E0D0C0B0A09080706050403020100") | |
| A = unhexlify("000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627") | |
| P = unhexlify("000102030405060708090A0B0C0D0E0F1011121314151617" | |
| "18191A1B1C1D1E1F2021222324252627") | |
| C = unhexlify("07E903BFC49552411ABC865F5ECE60F6FAD1F5A9F14D3070" | |
| "FA2F1308A563207FFE14C1EEA44B22059C7484319D8A2C53" | |
| "C236A7B3") | |
| mac_len = len(C) - len(P) | |
| # Prior to version 3.17, a nonce of maximum length (15 bytes) | |
| # was actually used as a 14 byte nonce. The last byte was erroneously | |
| # ignored. | |
| buggy_result = unhexlify("BA015C4E5AE54D76C890AE81BD40DC57" | |
| "03EDC30E8AC2A58BC5D8FA4D61C5BAE6" | |
| "C39BEAC435B2FD56A2A5085C1B135D77" | |
| "0C8264B7") | |
| cipher = AES.new(key, AES.MODE_OCB, nonce=nonce[:-1], mac_len=mac_len) | |
| cipher.update(A) | |
| C_out2, tag_out2 = cipher.encrypt_and_digest(P) | |
| self.assertEqual(buggy_result, C_out2 + tag_out2) | |
| def get_tests(config={}): | |
| tests = [] | |
| tests += list_test_cases(OcbTests) | |
| tests += list_test_cases(OcbFSMTests) | |
| tests += list_test_cases(OcbRfc7253Test) | |
| tests += list_test_cases(OcbDkgTest) | |
| return tests | |
| if __name__ == '__main__': | |
| def suite(): | |
| return unittest.TestSuite(get_tests()) | |
| unittest.main(defaultTest='suite') | |