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# ===================================================================
#
# Copyright (c) 2015, 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 json
import unittest
from binascii import unhexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.SelfTest.loader import load_test_vectors_wycheproof
from Crypto.Util.py3compat import tobytes, bchr
from Crypto.Cipher import AES
from Crypto.Hash import SHAKE128
from Crypto.Util.strxor import strxor
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
class SivTests(unittest.TestCase):
key_256 = get_tag_random("key_256", 32)
key_384 = get_tag_random("key_384", 48)
key_512 = get_tag_random("key_512", 64)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 128)
def test_loopback_128(self):
for key in self.key_256, self.key_384, self.key_512:
cipher = AES.new(key, AES.MODE_SIV, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct, mac = cipher.encrypt_and_digest(pt)
cipher = AES.new(key, AES.MODE_SIV, nonce=self.nonce_96)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
def test_nonce(self):
# Deterministic encryption
AES.new(self.key_256, AES.MODE_SIV)
cipher = AES.new(self.key_256, AES.MODE_SIV, self.nonce_96)
ct1, tag1 = cipher.encrypt_and_digest(self.data)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct2, tag2 = cipher.encrypt_and_digest(self.data)
self.assertEqual(ct1 + tag1, ct2 + tag2)
def test_nonce_must_be_bytes(self):
self.assertRaises(TypeError, AES.new, self.key_256, AES.MODE_SIV,
nonce=u'test12345678')
def test_nonce_length(self):
# nonce can be of any length (but not empty)
self.assertRaises(ValueError, AES.new, self.key_256, AES.MODE_SIV,
nonce=b"")
for x in range(1, 128):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=bchr(1) * x)
cipher.encrypt_and_digest(b'\x01')
def test_block_size_128(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, AES.block_size)
def test_nonce_attribute(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, no nonce is randomly generated
self.assertFalse(hasattr(AES.new(self.key_256, AES.MODE_SIV), "nonce"))
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_256, AES.MODE_SIV,
self.nonce_96, 7)
self.assertRaises(TypeError, AES.new, self.key_256, AES.MODE_SIV,
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_256, AES.MODE_SIV, nonce=self.nonce_96,
use_aesni=False)
def test_encrypt_excludes_decrypt(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data)
self.assertRaises(TypeError, cipher.decrypt, self.data)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data)
self.assertRaises(TypeError, cipher.decrypt_and_verify,
self.data, self.data)
def test_data_must_be_bytes(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt_and_verify,
u'test1234567890-*', b"xxxx")
def test_mac_len(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, 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_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data)
invalid_mac = strxor_c(mac, 0x01)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct,
invalid_mac)
def test_hex_mac(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.hexverify(mac_hex)
def test_bytearray(self):
# Encrypt
key = bytearray(self.key_256)
nonce = bytearray(self.nonce_96)
data = bytearray(self.data)
header = bytearray(self.data)
cipher1 = AES.new(self.key_256,
AES.MODE_SIV,
nonce=self.nonce_96)
cipher1.update(self.data)
ct, tag = cipher1.encrypt_and_digest(self.data)
cipher2 = AES.new(key,
AES.MODE_SIV,
nonce=nonce)
key[:3] = b'\xFF\xFF\xFF'
nonce[:3] = b'\xFF\xFF\xFF'
cipher2.update(header)
header[:3] = b'\xFF\xFF\xFF'
ct_test, tag_test = cipher2.encrypt_and_digest(data)
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key = bytearray(self.key_256)
nonce = bytearray(self.nonce_96)
header = bytearray(self.data)
ct_ba = bytearray(ct)
tag_ba = bytearray(tag)
cipher3 = AES.new(key,
AES.MODE_SIV,
nonce=nonce)
key[:3] = b'\xFF\xFF\xFF'
nonce[:3] = b'\xFF\xFF\xFF'
cipher3.update(header)
header[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt_and_verify(ct_ba, tag_ba)
self.assertEqual(self.data, pt_test)
def test_memoryview(self):
# Encrypt
key = memoryview(bytearray(self.key_256))
nonce = memoryview(bytearray(self.nonce_96))
data = memoryview(bytearray(self.data))
header = memoryview(bytearray(self.data))
cipher1 = AES.new(self.key_256,
AES.MODE_SIV,
nonce=self.nonce_96)
cipher1.update(self.data)
ct, tag = cipher1.encrypt_and_digest(self.data)
cipher2 = AES.new(key,
AES.MODE_SIV,
nonce=nonce)
key[:3] = b'\xFF\xFF\xFF'
nonce[:3] = b'\xFF\xFF\xFF'
cipher2.update(header)
header[:3] = b'\xFF\xFF\xFF'
ct_test, tag_test= cipher2.encrypt_and_digest(data)
self.assertEqual(ct, ct_test)
self.assertEqual(tag, tag_test)
self.assertEqual(cipher1.nonce, cipher2.nonce)
# Decrypt
key = memoryview(bytearray(self.key_256))
nonce = memoryview(bytearray(self.nonce_96))
header = memoryview(bytearray(self.data))
ct_ba = memoryview(bytearray(ct))
tag_ba = memoryview(bytearray(tag))
cipher3 = AES.new(key,
AES.MODE_SIV,
nonce=nonce)
key[:3] = b'\xFF\xFF\xFF'
nonce[:3] = b'\xFF\xFF\xFF'
cipher3.update(header)
header[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt_and_verify(ct_ba, tag_ba)
self.assertEqual(self.data, pt_test)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, tag = cipher.encrypt_and_digest(pt)
output = bytearray(128)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
res, tag_out = cipher.encrypt_and_digest(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
self.assertEqual(tag, tag_out)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
res = cipher.decrypt_and_verify(ct, tag, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
def test_output_param_memoryview(self):
pt = b'5' * 128
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, tag = cipher.encrypt_and_digest(pt)
output = memoryview(bytearray(128))
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.encrypt_and_digest(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, tag, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
LEN_PT = 128
pt = b'5' * LEN_PT
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, tag = cipher.encrypt_and_digest(pt)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt_and_digest, pt, output=b'0' * LEN_PT)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt_and_verify, ct, tag, output=b'0' * LEN_PT)
shorter_output = bytearray(LEN_PT - 1)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.encrypt_and_digest, pt, output=shorter_output)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct, tag, output=shorter_output)
class SivFSMTests(unittest.TestCase):
key_256 = get_tag_random("key_256", 32)
nonce_96 = get_tag_random("nonce_96", 12)
data = get_tag_random("data", 128)
def test_invalid_init_encrypt(self):
# Path INIT->ENCRYPT fails
cipher = AES.new(self.key_256, AES.MODE_SIV,
nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, b"xxx")
def test_invalid_init_decrypt(self):
# Path INIT->DECRYPT fails
cipher = AES.new(self.key_256, AES.MODE_SIV,
nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, b"xxx")
def test_valid_init_update_digest_verify(self):
# No plaintext, fixed authenticated data
# Verify path INIT->UPDATE->DIGEST
cipher = AES.new(self.key_256, AES.MODE_SIV,
nonce=self.nonce_96)
cipher.update(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = AES.new(self.key_256, AES.MODE_SIV,
nonce=self.nonce_96)
cipher.update(self.data)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
mac = cipher.digest()
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.verify(mac)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = AES.new(self.key_256, AES.MODE_SIV, 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_256, AES.MODE_SIV, 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_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.update(self.data)
ct, mac = cipher.encrypt_and_digest(self.data)
# decrypt_and_verify
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.update(self.data)
pt = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(self.data, pt)
def test_invalid_multiple_encrypt_and_digest(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, tag = cipher.encrypt_and_digest(self.data)
self.assertRaises(TypeError, cipher.encrypt_and_digest, b'')
def test_invalid_multiple_decrypt_and_verify(self):
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
ct, tag = cipher.encrypt_and_digest(self.data)
cipher = AES.new(self.key_256, AES.MODE_SIV, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, tag)
self.assertRaises(TypeError, cipher.decrypt_and_verify, ct, tag)
def transform(tv):
new_tv = [[unhexlify(x) for x in tv[0].split("-")]]
new_tv += [ unhexlify(x) for x in tv[1:5]]
if tv[5]:
nonce = unhexlify(tv[5])
else:
nonce = None
new_tv += [ nonce ]
return new_tv
class TestVectors(unittest.TestCase):
"""Class exercising the SIV test vectors found in RFC5297"""
# This is a list of tuples with 5 items:
#
# 1. Header + '|' + plaintext
# 2. Header + '|' + ciphertext + '|' + MAC
# 3. AES-128 key
# 4. Description
# 5. Dictionary of parameters to be passed to AES.new().
# It must include the nonce.
#
# A "Header" is a dash ('-') separated sequece of components.
#
test_vectors_hex = [
(
'101112131415161718191a1b1c1d1e1f2021222324252627',
'112233445566778899aabbccddee',
'40c02b9690c4dc04daef7f6afe5c',
'85632d07c6e8f37f950acd320a2ecc93',
'fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff',
None
),
(
'00112233445566778899aabbccddeeffdeaddadadeaddadaffeeddccbbaa9988' +
'7766554433221100-102030405060708090a0',
'7468697320697320736f6d6520706c61696e7465787420746f20656e63727970' +
'74207573696e67205349562d414553',
'cb900f2fddbe404326601965c889bf17dba77ceb094fa663b7a3f748ba8af829' +
'ea64ad544a272e9c485b62a3fd5c0d',
'7bdb6e3b432667eb06f4d14bff2fbd0f',
'7f7e7d7c7b7a79787776757473727170404142434445464748494a4b4c4d4e4f',
'09f911029d74e35bd84156c5635688c0'
),
]
test_vectors = [ transform(tv) for tv in test_vectors_hex ]
def runTest(self):
for assoc_data, pt, ct, mac, key, nonce in self.test_vectors:
# Encrypt
cipher = AES.new(key, AES.MODE_SIV, nonce=nonce)
for x in assoc_data:
cipher.update(x)
ct2, mac2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(mac, mac2)
# Decrypt
cipher = AES.new(key, AES.MODE_SIV, nonce=nonce)
for x in assoc_data:
cipher.update(x)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
class TestVectorsWycheproof(unittest.TestCase):
def __init__(self):
unittest.TestCase.__init__(self)
self._id = "None"
def setUp(self):
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aes_siv_cmac_test.json",
"Wycheproof AES SIV")
def shortDescription(self):
return self._id
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt AES-SIV Test #" + str(tv.id)
cipher = AES.new(tv.key, AES.MODE_SIV)
cipher.update(tv.aad)
ct, tag = cipher.encrypt_and_digest(tv.msg)
if tv.valid:
self.assertEqual(tag + ct, tv.ct)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt AES_SIV Test #" + str(tv.id)
cipher = AES.new(tv.key, AES.MODE_SIV)
cipher.update(tv.aad)
try:
pt = cipher.decrypt_and_verify(tv.ct[16:], tv.ct[:16])
except ValueError:
assert not tv.valid
else:
assert tv.valid
self.assertEqual(pt, tv.msg)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
class TestVectorsWycheproof2(unittest.TestCase):
def __init__(self):
unittest.TestCase.__init__(self)
self._id = "None"
def setUp(self):
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aead_aes_siv_cmac_test.json",
"Wycheproof AEAD SIV")
def shortDescription(self):
return self._id
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt AEAD-AES-SIV Test #" + str(tv.id)
cipher = AES.new(tv.key, AES.MODE_SIV, nonce=tv.iv)
cipher.update(tv.aad)
ct, tag = cipher.encrypt_and_digest(tv.msg)
if tv.valid:
self.assertEqual(ct, tv.ct)
self.assertEqual(tag, tv.tag)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt AEAD-AES-SIV Test #" + str(tv.id)
cipher = AES.new(tv.key, AES.MODE_SIV, nonce=tv.iv)
cipher.update(tv.aad)
try:
pt = cipher.decrypt_and_verify(tv.ct, tv.tag)
except ValueError:
assert not tv.valid
else:
assert tv.valid
self.assertEqual(pt, tv.msg)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
def get_tests(config={}):
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(SivTests)
tests += list_test_cases(SivFSMTests)
tests += [ TestVectors() ]
tests += [ TestVectorsWycheproof() ]
tests += [ TestVectorsWycheproof2() ]
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')