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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 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, DES3
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 EaxTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
key_192 = get_tag_random("key_192", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data_128 = get_tag_random("data_128", 16)
def test_loopback_128(self):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_loopback_64(self):
cipher = DES3.new(self.key_192, DES3.MODE_EAX, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 8 * 100)
ct = cipher.encrypt(pt)
cipher = DES3.new(self.key_192, DES3.MODE_EAX, nonce=self.nonce_96)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_nonce(self):
# If not passed, the nonce is created randomly
cipher = AES.new(self.key_128, AES.MODE_EAX)
nonce1 = cipher.nonce
cipher = AES.new(self.key_128, AES.MODE_EAX)
nonce2 = cipher.nonce
self.assertEqual(len(nonce1), 16)
self.assertNotEqual(nonce1, nonce2)
cipher = AES.new(self.key_128, AES.MODE_EAX, self.nonce_96)
ct = cipher.encrypt(self.data_128)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertEqual(ct, cipher.encrypt(self.data_128))
def test_nonce_must_be_bytes(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_EAX,
nonce=u'test12345678')
def test_nonce_length(self):
# nonce can be of any length (but not empty)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_EAX,
nonce=b"")
for x in range(1, 128):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=bchr(1) * x)
cipher.encrypt(bchr(1))
def test_block_size_128(self):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, AES.block_size)
def test_block_size_64(self):
cipher = DES3.new(self.key_192, AES.MODE_EAX, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, DES3.block_size)
def test_nonce_attribute(self):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, a 16 bytes long nonce is randomly generated
nonce1 = AES.new(self.key_128, AES.MODE_EAX).nonce
nonce2 = AES.new(self.key_128, AES.MODE_EAX).nonce
self.assertEqual(len(nonce1), 16)
self.assertNotEqual(nonce1, nonce2)
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_EAX,
self.nonce_96, 7)
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_EAX,
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_EAX, 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_EAX, 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_EAX, nonce=self.nonce_96)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.decrypt(b"")
self.assertRaises(TypeError, cipher.encrypt, b"")
def test_data_must_be_bytes(self):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_128, AES.MODE_EAX, 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_EAX,
nonce=self.nonce_96, mac_len=2-1)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_EAX,
nonce=self.nonce_96, mac_len=16+1)
# Valid MAC length
for mac_len in range(2, 16 + 1):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96,
mac_len=mac_len)
_, mac = cipher.encrypt_and_digest(self.data_128)
self.assertEqual(len(mac), mac_len)
# Default MAC length
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
_, mac = cipher.encrypt_and_digest(self.data_128)
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_EAX, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data_128)
invalid_mac = strxor_c(mac, 0x01)
cipher = AES.new(self.key_128, AES.MODE_EAX, 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_EAX, nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = AES.new(self.key_128, AES.MODE_EAX, 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_EAX, 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_EAX, 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)
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_EAX, 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)
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_128)
data_ba = bytearray(self.data_128)
cipher1 = AES.new(self.key_128,
AES.MODE_EAX,
nonce=self.nonce_96)
cipher1.update(self.data_128)
ct = cipher1.encrypt(self.data_128)
tag = cipher1.digest()
cipher2 = AES.new(key_ba,
AES.MODE_EAX,
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)
data_ba[:3] = b'\x99\x99\x99'
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_128)
ct_ba = bytearray(ct)
tag_ba = bytearray(tag)
del data_ba
cipher3 = AES.new(key_ba,
AES.MODE_EAX,
nonce=nonce_ba)
key_ba[:3] = b'\xFF\xFF\xFF'
nonce_ba[:3] = b'\xFF\xFF\xFF'
cipher3.update(header_ba)
header_ba[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt(ct_ba)
ct_ba[:3] = b'\xFF\xFF\xFF'
cipher3.verify(tag_ba)
self.assertEqual(pt_test, self.data_128)
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_128))
data_mv = memoryview(bytearray(self.data_128))
cipher1 = AES.new(self.key_128,
AES.MODE_EAX,
nonce=self.nonce_96)
cipher1.update(self.data_128)
ct = cipher1.encrypt(self.data_128)
tag = cipher1.digest()
cipher2 = AES.new(key_mv,
AES.MODE_EAX,
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)
data_mv[:3] = b'\x99\x99\x99'
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_128))
ct_mv = memoryview(bytearray(ct))
tag_mv = memoryview(bytearray(tag))
del data_mv
cipher3 = AES.new(key_mv,
AES.MODE_EAX,
nonce=nonce_mv)
key_mv[:3] = b'\xFF\xFF\xFF'
nonce_mv[:3] = b'\xFF\xFF\xFF'
cipher3.update(header_mv)
header_mv[:3] = b'\xFF\xFF\xFF'
pt_test = cipher3.decrypt(ct_mv)
ct_mv[:3] = b'\x99\x99\x99'
cipher3.verify(tag_mv)
self.assertEqual(pt_test, self.data_128)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
tag = cipher.digest()
output = bytearray(128)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
res = cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
res = cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
cipher = AES.new(self.key_128, AES.MODE_EAX, 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_128, AES.MODE_EAX, 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_128, AES.MODE_EAX, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
output = memoryview(bytearray(128))
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
LEN_PT = 16
pt = b'5' * LEN_PT
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * LEN_PT)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * LEN_PT)
shorter_output = bytearray(LEN_PT - 1)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
class EaxFSMTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data_128 = get_tag_random("data_128", 16)
def test_valid_init_encrypt_decrypt_digest_verify(self):
# No authenticated data, fixed plaintext
# Verify path INIT->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
# Verify path INIT->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
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_EAX,
nonce=self.nonce_96)
cipher.update(self.data_128)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
cipher.update(self.data_128)
cipher.verify(mac)
def test_valid_full_path(self):
# Fixed authenticated data, fixed plaintext
# Verify path INIT->UPDATE->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
cipher.update(self.data_128)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
# Verify path INIT->UPDATE->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
cipher.update(self.data_128)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_EAX, 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_128,
self.data_128 + b"3"):
if auth_data is None:
assoc_len = None
else:
assoc_len = len(auth_data)
cipher = AES.new(self.key_128, AES.MODE_EAX,
nonce=self.nonce_96)
if auth_data is not None:
cipher.update(auth_data)
method = getattr(cipher, method_name)
method(self.data_128)
method(self.data_128)
method(self.data_128)
method(self.data_128)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.update(self.data_128)
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_EAX, nonce=self.nonce_96)
cipher.update(self.data_128)
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_EAX, nonce=self.nonce_96)
cipher.update(self.data_128)
ct, mac = cipher.encrypt_and_digest(self.data_128)
# decrypt_and_verify
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.update(self.data_128)
pt = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(self.data_128, 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_EAX,
nonce=self.nonce_96)
if assoc_data_present:
cipher.update(self.data_128)
getattr(cipher, method1_name)(self.data_128)
self.assertRaises(TypeError, getattr(cipher, method2_name),
self.data_128)
def test_invalid_encrypt_or_update_after_digest(self):
for method_name in "encrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.encrypt(self.data_128)
cipher.digest()
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.encrypt_and_digest(self.data_128)
def test_invalid_decrypt_or_update_after_verify(self):
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
ct = cipher.encrypt(self.data_128)
mac = cipher.digest()
for method_name in "decrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
cipher = AES.new(self.key_128, AES.MODE_EAX, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data_128)
class TestVectorsPaper(unittest.TestCase):
"""Class exercising the EAX test vectors found in
http://www.cs.ucdavis.edu/~rogaway/papers/eax.pdf"""
test_vectors_hex = [
( '6bfb914fd07eae6b',
'',
'',
'e037830e8389f27b025a2d6527e79d01',
'233952dee4d5ed5f9b9c6d6ff80ff478',
'62EC67F9C3A4A407FCB2A8C49031A8B3'
),
(
'fa3bfd4806eb53fa',
'f7fb',
'19dd',
'5c4c9331049d0bdab0277408f67967e5',
'91945d3f4dcbee0bf45ef52255f095a4',
'BECAF043B0A23D843194BA972C66DEBD'
),
( '234a3463c1264ac6',
'1a47cb4933',
'd851d5bae0',
'3a59f238a23e39199dc9266626c40f80',
'01f74ad64077f2e704c0f60ada3dd523',
'70C3DB4F0D26368400A10ED05D2BFF5E'
),
(
'33cce2eabff5a79d',
'481c9e39b1',
'632a9d131a',
'd4c168a4225d8e1ff755939974a7bede',
'd07cf6cbb7f313bdde66b727afd3c5e8',
'8408DFFF3C1A2B1292DC199E46B7D617'
),
(
'aeb96eaebe2970e9',
'40d0c07da5e4',
'071dfe16c675',
'cb0677e536f73afe6a14b74ee49844dd',
'35b6d0580005bbc12b0587124557d2c2',
'FDB6B06676EEDC5C61D74276E1F8E816'
),
(
'd4482d1ca78dce0f',
'4de3b35c3fc039245bd1fb7d',
'835bb4f15d743e350e728414',
'abb8644fd6ccb86947c5e10590210a4f',
'bd8e6e11475e60b268784c38c62feb22',
'6EAC5C93072D8E8513F750935E46DA1B'
),
(
'65d2017990d62528',
'8b0a79306c9ce7ed99dae4f87f8dd61636',
'02083e3979da014812f59f11d52630da30',
'137327d10649b0aa6e1c181db617d7f2',
'7c77d6e813bed5ac98baa417477a2e7d',
'1A8C98DCD73D38393B2BF1569DEEFC19'
),
(
'54b9f04e6a09189a',
'1bda122bce8a8dbaf1877d962b8592dd2d56',
'2ec47b2c4954a489afc7ba4897edcdae8cc3',
'3b60450599bd02c96382902aef7f832a',
'5fff20cafab119ca2fc73549e20f5b0d',
'DDE59B97D722156D4D9AFF2BC7559826'
),
(
'899a175897561d7e',
'6cf36720872b8513f6eab1a8a44438d5ef11',
'0de18fd0fdd91e7af19f1d8ee8733938b1e8',
'e7f6d2231618102fdb7fe55ff1991700',
'a4a4782bcffd3ec5e7ef6d8c34a56123',
'B781FCF2F75FA5A8DE97A9CA48E522EC'
),
(
'126735fcc320d25a',
'ca40d7446e545ffaed3bd12a740a659ffbbb3ceab7',
'cb8920f87a6c75cff39627b56e3ed197c552d295a7',
'cfc46afc253b4652b1af3795b124ab6e',
'8395fcf1e95bebd697bd010bc766aac3',
'22E7ADD93CFC6393C57EC0B3C17D6B44'
),
]
test_vectors = [[unhexlify(x) for x in 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_EAX, nonce, mac_len=len(mac))
cipher.update(assoc_data)
ct2, mac2 = cipher.encrypt_and_digest(pt)
self.assertEqual(ct, ct2)
self.assertEqual(mac, mac2)
# Decrypt
cipher = AES.new(key, AES.MODE_EAX, nonce, mac_len=len(mac))
cipher.update(assoc_data)
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(pt, pt2)
class TestVectorsWycheproof(unittest.TestCase):
def __init__(self, wycheproof_warnings):
unittest.TestCase.__init__(self)
self._wycheproof_warnings = wycheproof_warnings
self._id = "None"
def setUp(self):
def filter_tag(group):
return group['tagSize'] // 8
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aes_eax_test.json",
"Wycheproof EAX",
group_tag={'tag_size': filter_tag})
def shortDescription(self):
return self._id
def warn(self, tv):
if tv.warning and self._wycheproof_warnings:
import warnings
warnings.warn("Wycheproof warning: %s (%s)" % (self._id, tv.comment))
def test_encrypt(self, tv):
self._id = "Wycheproof Encrypt EAX Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
except ValueError as e:
assert len(tv.iv) == 0 and "Nonce cannot be empty" in str(e)
return
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)
self.warn(tv)
def test_decrypt(self, tv):
self._id = "Wycheproof Decrypt EAX Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
except ValueError as e:
assert len(tv.iv) == 0 and "Nonce cannot be empty" in str(e)
return
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)
self.warn(tv)
def test_corrupt_decrypt(self, tv):
self._id = "Wycheproof Corrupt Decrypt EAX Test #" + str(tv.id)
if len(tv.iv) == 0 or len(tv.ct) < 1:
return
cipher = AES.new(tv.key, AES.MODE_EAX, tv.iv, mac_len=tv.tag_size)
cipher.update(tv.aad)
ct_corrupt = strxor(tv.ct, b"\x00" * (len(tv.ct) - 1) + b"\x01")
self.assertRaises(ValueError, cipher.decrypt_and_verify, ct_corrupt, tv.tag)
def runTest(self):
for tv in self.tv:
self.test_encrypt(tv)
self.test_decrypt(tv)
self.test_corrupt_decrypt(tv)
class TestOtherCiphers(unittest.TestCase):
@classmethod
def create_test(cls, name, factory, key_size):
def test_template(self, factory=factory, key_size=key_size):
cipher = factory.new(get_tag_random("cipher", key_size),
factory.MODE_EAX,
nonce=b"nonce")
ct, mac = cipher.encrypt_and_digest(b"plaintext")
cipher = factory.new(get_tag_random("cipher", key_size),
factory.MODE_EAX,
nonce=b"nonce")
pt2 = cipher.decrypt_and_verify(ct, mac)
self.assertEqual(b"plaintext", pt2)
setattr(cls, "test_" + name, test_template)
from Crypto.Cipher import DES, DES3, ARC2, CAST, Blowfish
TestOtherCiphers.create_test("DES_" + str(DES.key_size), DES, DES.key_size)
for ks in DES3.key_size:
TestOtherCiphers.create_test("DES3_" + str(ks), DES3, ks)
for ks in ARC2.key_size:
TestOtherCiphers.create_test("ARC2_" + str(ks), ARC2, ks)
for ks in CAST.key_size:
TestOtherCiphers.create_test("CAST_" + str(ks), CAST, ks)
for ks in Blowfish.key_size:
TestOtherCiphers.create_test("Blowfish_" + str(ks), Blowfish, ks)
def get_tests(config={}):
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(EaxTests)
tests += list_test_cases(EaxFSMTests)
tests += [ TestVectorsPaper() ]
tests += [ TestVectorsWycheproof(wycheproof_warnings) ]
tests += list_test_cases(TestOtherCiphers)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
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