846 lines
32 KiB
Python
846 lines
32 KiB
Python
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# ===================================================================
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#
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# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ===================================================================
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import unittest
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from binascii import unhexlify
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from Cryptodome.Util.py3compat import b, tobytes, bchr
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from Cryptodome.Util.number import long_to_bytes
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from Cryptodome.SelfTest.loader import load_test_vectors
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from Cryptodome.SelfTest.st_common import list_test_cases
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from Cryptodome.Cipher import AES
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from Cryptodome.Hash import SHAKE128
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def get_tag_random(tag, length):
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return SHAKE128.new(data=tobytes(tag)).read(length)
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class OcbTests(unittest.TestCase):
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key_128 = get_tag_random("key_128", 16)
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nonce_96 = get_tag_random("nonce_128", 12)
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data = get_tag_random("data", 128)
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def test_loopback_128(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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pt = get_tag_random("plaintext", 16 * 100)
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ct, mac = cipher.encrypt_and_digest(pt)
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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pt2 = cipher.decrypt_and_verify(ct, mac)
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self.assertEqual(pt, pt2)
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def test_nonce(self):
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# Nonce is optional
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AES.new(self.key_128, AES.MODE_OCB)
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cipher = AES.new(self.key_128, AES.MODE_OCB, self.nonce_96)
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ct = cipher.encrypt(self.data)
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertEqual(ct, cipher.encrypt(self.data))
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def test_nonce_must_be_bytes(self):
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self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=u'test12345678')
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def test_nonce_length(self):
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# nonce cannot be empty
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self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=b(""))
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# nonce can be up to 15 bytes long
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for length in range(1, 16):
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AES.new(self.key_128, AES.MODE_OCB, nonce=self.data[:length])
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self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=self.data)
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def test_block_size_128(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertEqual(cipher.block_size, AES.block_size)
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# By default, a 15 bytes long nonce is randomly generated
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nonce1 = AES.new(self.key_128, AES.MODE_OCB).nonce
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nonce2 = AES.new(self.key_128, AES.MODE_OCB).nonce
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self.assertEqual(len(nonce1), 15)
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self.assertNotEqual(nonce1, nonce2)
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def test_nonce_attribute(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertEqual(cipher.nonce, self.nonce_96)
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# By default, a 15 bytes long nonce is randomly generated
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nonce1 = AES.new(self.key_128, AES.MODE_OCB).nonce
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nonce2 = AES.new(self.key_128, AES.MODE_OCB).nonce
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self.assertEqual(len(nonce1), 15)
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self.assertNotEqual(nonce1, nonce2)
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def test_unknown_parameters(self):
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self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_OCB,
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self.nonce_96, 7)
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self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=self.nonce_96, unknown=7)
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# But some are only known by the base cipher
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# (e.g. use_aesni consumed by the AES module)
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AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96,
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use_aesni=False)
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def test_null_encryption_decryption(self):
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for func in "encrypt", "decrypt":
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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result = getattr(cipher, func)(b(""))
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self.assertEqual(result, b(""))
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def test_either_encrypt_or_decrypt(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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cipher.encrypt(b("xyz"))
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self.assertRaises(TypeError, cipher.decrypt, b("xyz"))
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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cipher.decrypt(b("xyz"))
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self.assertRaises(TypeError, cipher.encrypt, b("xyz"))
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def test_data_must_be_bytes(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
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def test_mac_len(self):
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# Invalid MAC length
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self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=self.nonce_96, mac_len=7)
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self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_OCB,
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nonce=self.nonce_96, mac_len=16+1)
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# Valid MAC length
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for mac_len in range(8, 16 + 1):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96,
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mac_len=mac_len)
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_, mac = cipher.encrypt_and_digest(self.data)
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self.assertEqual(len(mac), mac_len)
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# Default MAC length
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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_, mac = cipher.encrypt_and_digest(self.data)
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self.assertEqual(len(mac), 16)
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def test_invalid_mac(self):
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from Cryptodome.Util.strxor import strxor_c
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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ct, mac = cipher.encrypt_and_digest(self.data)
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invalid_mac = strxor_c(mac, 0x01)
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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self.assertRaises(ValueError, cipher.decrypt_and_verify, ct,
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invalid_mac)
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def test_hex_mac(self):
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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mac_hex = cipher.hexdigest()
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self.assertEqual(cipher.digest(), unhexlify(mac_hex))
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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cipher.hexverify(mac_hex)
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def test_message_chunks(self):
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# Validate that both associated data and plaintext/ciphertext
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# can be broken up in chunks of arbitrary length
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auth_data = get_tag_random("authenticated data", 127)
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plaintext = get_tag_random("plaintext", 127)
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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cipher.update(auth_data)
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ciphertext, ref_mac = cipher.encrypt_and_digest(plaintext)
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def break_up(data, chunk_length):
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return [data[i:i+chunk_length] for i in range(0, len(data),
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chunk_length)]
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# Encryption
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for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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for chunk in break_up(auth_data, chunk_length):
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cipher.update(chunk)
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pt2 = b("")
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for chunk in break_up(ciphertext, chunk_length):
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pt2 += cipher.decrypt(chunk)
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pt2 += cipher.decrypt()
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self.assertEqual(plaintext, pt2)
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cipher.verify(ref_mac)
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# Decryption
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for chunk_length in 1, 2, 3, 7, 10, 13, 16, 40, 80, 128:
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cipher = AES.new(self.key_128, AES.MODE_OCB, nonce=self.nonce_96)
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for chunk in break_up(auth_data, chunk_length):
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cipher.update(chunk)
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ct2 = b("")
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for chunk in break_up(plaintext, chunk_length):
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ct2 += cipher.encrypt(chunk)
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ct2 += cipher.encrypt()
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self.assertEqual(ciphertext, ct2)
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self.assertEqual(cipher.digest(), ref_mac)
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def test_bytearray(self):
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# Encrypt
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key_ba = bytearray(self.key_128)
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nonce_ba = bytearray(self.nonce_96)
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header_ba = bytearray(self.data)
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data_ba = bytearray(self.data)
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cipher1 = AES.new(self.key_128,
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AES.MODE_OCB,
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nonce=self.nonce_96)
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cipher1.update(self.data)
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ct = cipher1.encrypt(self.data) + cipher1.encrypt()
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tag = cipher1.digest()
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cipher2 = AES.new(key_ba,
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AES.MODE_OCB,
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nonce=nonce_ba)
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key_ba[:3] = b"\xFF\xFF\xFF"
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nonce_ba[:3] = b"\xFF\xFF\xFF"
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cipher2.update(header_ba)
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header_ba[:3] = b"\xFF\xFF\xFF"
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ct_test = cipher2.encrypt(data_ba) + cipher2.encrypt()
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data_ba[:3] = b"\xFF\xFF\xFF"
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tag_test = cipher2.digest()
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self.assertEqual(ct, ct_test)
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self.assertEqual(tag, tag_test)
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self.assertEqual(cipher1.nonce, cipher2.nonce)
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# Decrypt
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key_ba = bytearray(self.key_128)
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nonce_ba = bytearray(self.nonce_96)
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header_ba = bytearray(self.data)
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del data_ba
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cipher4 = AES.new(key_ba,
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AES.MODE_OCB,
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nonce=nonce_ba)
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key_ba[:3] = b"\xFF\xFF\xFF"
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nonce_ba[:3] = b"\xFF\xFF\xFF"
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cipher4.update(header_ba)
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header_ba[:3] = b"\xFF\xFF\xFF"
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pt_test = cipher4.decrypt_and_verify(bytearray(ct_test), bytearray(tag_test))
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self.assertEqual(self.data, pt_test)
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def test_memoryview(self):
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# Encrypt
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key_mv = memoryview(bytearray(self.key_128))
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nonce_mv = memoryview(bytearray(self.nonce_96))
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header_mv = memoryview(bytearray(self.data))
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data_mv = memoryview(bytearray(self.data))
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cipher1 = AES.new(self.key_128,
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AES.MODE_OCB,
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nonce=self.nonce_96)
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cipher1.update(self.data)
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ct = cipher1.encrypt(self.data) + cipher1.encrypt()
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tag = cipher1.digest()
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cipher2 = AES.new(key_mv,
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AES.MODE_OCB,
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nonce=nonce_mv)
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key_mv[:3] = b"\xFF\xFF\xFF"
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nonce_mv[:3] = b"\xFF\xFF\xFF"
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cipher2.update(header_mv)
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header_mv[:3] = b"\xFF\xFF\xFF"
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ct_test = cipher2.encrypt(data_mv) + cipher2.encrypt()
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data_mv[:3] = b"\xFF\xFF\xFF"
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tag_test = cipher2.digest()
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self.assertEqual(ct, ct_test)
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self.assertEqual(tag, tag_test)
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self.assertEqual(cipher1.nonce, cipher2.nonce)
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# Decrypt
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key_mv = memoryview(bytearray(self.key_128))
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nonce_mv = memoryview(bytearray(self.nonce_96))
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header_mv = memoryview(bytearray(self.data))
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del data_mv
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cipher4 = AES.new(key_mv,
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AES.MODE_OCB,
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nonce=nonce_mv)
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key_mv[:3] = b"\xFF\xFF\xFF"
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nonce_mv[:3] = b"\xFF\xFF\xFF"
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cipher4.update(header_mv)
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header_mv[:3] = b"\xFF\xFF\xFF"
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pt_test = cipher4.decrypt_and_verify(memoryview(ct_test), memoryview(tag_test))
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self.assertEqual(self.data, pt_test)
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class OcbFSMTests(unittest.TestCase):
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key_128 = get_tag_random("key_128", 16)
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nonce_96 = get_tag_random("nonce_128", 12)
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data = get_tag_random("data", 128)
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def test_valid_init_encrypt_decrypt_digest_verify(self):
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# No authenticated data, fixed plaintext
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# Verify path INIT->ENCRYPT->ENCRYPT(NONE)->DIGEST
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cipher = AES.new(self.key_128, AES.MODE_OCB,
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nonce=self.nonce_96)
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ct = cipher.encrypt(self.data)
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ct += cipher.encrypt()
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mac = cipher.digest()
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# Verify path INIT->DECRYPT->DECRYPT(NONCE)->VERIFY
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|
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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')
|