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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')
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