diff options
Diffstat (limited to 'lib/Crypto/SelfTest/Cipher/test_OCB.py')
| -rw-r--r-- | lib/Crypto/SelfTest/Cipher/test_OCB.py | 742 |
1 files changed, 742 insertions, 0 deletions
diff --git a/lib/Crypto/SelfTest/Cipher/test_OCB.py b/lib/Crypto/SelfTest/Cipher/test_OCB.py new file mode 100644 index 0000000..3a89122 --- /dev/null +++ b/lib/Crypto/SelfTest/Cipher/test_OCB.py @@ -0,0 +1,742 @@ +# =================================================================== +# +# 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 os +import re +import unittest +from binascii import hexlify, unhexlify + +from Crypto.Util.py3compat import b, tobytes, bchr +from Crypto.Util.strxor import strxor_c +from Crypto.Util.number import long_to_bytes +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) + + 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")): + if auth_data is None: + assoc_len = None + else: + assoc_len = len(auth_data) + 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) + + +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: + + 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, 12) + 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, 12) + 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, 12) + 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, 12) + cipher = AES.new(key, AES.MODE_OCB, nonce=N, mac_len=taglen // 8) + cipher.update(C) + result2 = cipher.encrypt() + cipher.digest() + self.assertEqual(unhexlify(b(result)), result2) + + +def get_tests(config={}): + tests = [] + tests += list_test_cases(OcbTests) + tests += list_test_cases(OcbFSMTests) + tests += list_test_cases(OcbRfc7253Test) + return tests + + +if __name__ == '__main__': + import unittest + suite = lambda: unittest.TestSuite(get_tests()) + unittest.main(defaultTest='suite') |