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Mini Shell
# ===================================================================
#
# 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
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 CcmTests(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_CCM, nonce=self.nonce_96)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM)
nonce1 = cipher.nonce
cipher = AES.new(self.key_128, AES.MODE_CCM)
nonce2 = cipher.nonce
self.assertEqual(len(nonce1), 11)
self.assertNotEqual(nonce1, nonce2)
cipher = AES.new(self.key_128, AES.MODE_CCM, self.nonce_96)
ct = cipher.encrypt(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM,
nonce=u'test12345678')
def test_nonce_length(self):
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=b"")
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=bchr(1) * 6)
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=bchr(1) * 14)
for x in range(7, 13 + 1):
AES.new(self.key_128, AES.MODE_CCM, nonce=bchr(1) * x)
def test_block_size(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertEqual(cipher.block_size, AES.block_size)
def test_nonce_attribute(self):
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertEqual(cipher.nonce, self.nonce_96)
# By default, a 11 bytes long nonce is randomly generated
nonce1 = AES.new(self.key_128, AES.MODE_CCM).nonce
nonce2 = AES.new(self.key_128, AES.MODE_CCM).nonce
self.assertEqual(len(nonce1), 11)
self.assertNotEqual(nonce1, nonce2)
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
self.nonce_96, 7)
self.assertRaises(TypeError, AES.new, self.key_128, AES.MODE_CCM,
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_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
def test_mac_len(self):
# Invalid MAC length
for mac_len in range(3, 17 + 1, 2):
self.assertRaises(ValueError, AES.new, self.key_128, AES.MODE_CCM,
nonce=self.nonce_96, mac_len=mac_len)
# Valid MAC length
for mac_len in range(4, 16 + 1, 2):
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96)
mac_hex = cipher.hexdigest()
self.assertEqual(cipher.digest(), unhexlify(mac_hex))
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.hexverify(mac_hex)
def test_longer_assoc_data_than_declared(self):
# More than zero
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=0)
self.assertRaises(ValueError, cipher.update, b"1")
# Too large
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=15)
self.assertRaises(ValueError, cipher.update, self.data)
def test_shorter_assoc_data_than_expected(self):
DATA_LEN = len(self.data)
# With plaintext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.encrypt, self.data)
# With empty plaintext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.digest)
# With ciphertext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.decrypt, self.data)
# With empty ciphertext
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.update(self.data)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
assoc_len=DATA_LEN + 1)
cipher.update(self.data)
self.assertRaises(ValueError, cipher.verify, mac)
def test_shorter_and_longer_plaintext_than_declared(self):
DATA_LEN = len(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN + 1)
cipher.encrypt(self.data)
self.assertRaises(ValueError, cipher.digest)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN - 1)
self.assertRaises(ValueError, cipher.encrypt, self.data)
def test_shorter_ciphertext_than_declared(self):
DATA_LEN = len(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct, mac = cipher.encrypt_and_digest(self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN + 1)
cipher.decrypt(ct)
self.assertRaises(ValueError, cipher.verify, mac)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96,
msg_len=DATA_LEN - 1)
self.assertRaises(ValueError, cipher.decrypt, ct)
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_CCM, 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_CCM, nonce=self.nonce_96,
msg_len=127, assoc_len=127)
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_CCM, nonce=self.nonce_96,
msg_len=127, assoc_len=127)
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)
data_ba = bytearray(self.data)
cipher1 = AES.new(self.key_128,
AES.MODE_CCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_ba,
AES.MODE_CCM,
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"\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_CCM,
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_CCM,
nonce=self.nonce_96)
cipher1.update(self.data)
ct = cipher1.encrypt(self.data)
tag = cipher1.digest()
cipher2 = AES.new(key_mv,
AES.MODE_CCM,
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"\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_CCM,
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)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
tag = cipher.digest()
output = bytearray(128)
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, 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_CCM, 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_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
output = memoryview(bytearray(128))
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
pt = b'5' * 16
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0'*16)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0'*16)
shorter_output = bytearray(15)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
class CcmFSMTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
nonce_96 = get_tag_random("nonce_128", 12)
data = get_tag_random("data", 16)
def test_valid_init_encrypt_decrypt_digest_verify(self):
# No authenticated data, fixed plaintext
for assoc_len in (None, 0):
for msg_len in (None, len(self.data)):
# Verify path INIT->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_update_digest_verify(self):
# No plaintext, fixed authenticated data
for assoc_len in (None, len(self.data)):
for msg_len in (None, 0):
# Verify path INIT->UPDATE->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
cipher.verify(mac)
def test_valid_full_path(self):
# Fixed authenticated data, fixed plaintext
for assoc_len in (None, len(self.data)):
for msg_len in (None, len(self.data)):
# Verify path INIT->UPDATE->ENCRYPT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
# Verify path INIT->UPDATE->DECRYPT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
assoc_len=assoc_len,
msg_len=msg_len)
cipher.update(self.data)
cipher.decrypt(ct)
cipher.verify(mac)
def test_valid_init_digest(self):
# Verify path INIT->DIGEST
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.digest()
def test_valid_init_verify(self):
# Verify path INIT->VERIFY
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
mac = cipher.digest()
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.verify(mac)
def test_valid_multiple_encrypt_or_decrypt(self):
# Only possible if msg_len is declared in advance
for method_name in "encrypt", "decrypt":
for auth_data in (None, b"333", self.data,
self.data + b"3"):
if auth_data is None:
assoc_len = None
else:
assoc_len = len(auth_data)
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96,
msg_len=64,
assoc_len=assoc_len)
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)
def test_valid_multiple_digest_or_verify(self):
# Multiple calls to digest
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, 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_CCM, 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_CCM, 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_decrypt_without_msg_len(self):
# Once per method, with or without assoc. data
for method_name in "encrypt", "decrypt":
for assoc_data_present in (True, False):
cipher = AES.new(self.key_128, AES.MODE_CCM,
nonce=self.nonce_96)
if assoc_data_present:
cipher.update(self.data)
method = getattr(cipher, method_name)
method(self.data)
self.assertRaises(TypeError, method, self.data)
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_CCM,
nonce=self.nonce_96,
msg_len=32)
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_CCM, nonce=self.nonce_96)
cipher.encrypt(self.data)
cipher.digest()
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, 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_CCM, nonce=self.nonce_96)
ct = cipher.encrypt(self.data)
mac = cipher.digest()
for method_name in "decrypt", "update":
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt(ct)
cipher.verify(mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
cipher = AES.new(self.key_128, AES.MODE_CCM, nonce=self.nonce_96)
cipher.decrypt_and_verify(ct, mac)
self.assertRaises(TypeError, getattr(cipher, method_name),
self.data)
class TestVectors(unittest.TestCase):
"""Class exercising the CCM test vectors found in Appendix C
of NIST SP 800-38C and in RFC 3610"""
# List of test vectors, each made up of:
# - authenticated data
# - plaintext
# - ciphertext
# - MAC
# - AES key
# - nonce
test_vectors_hex = [
# NIST SP 800 38C
( '0001020304050607',
'20212223',
'7162015b',
'4dac255d',
'404142434445464748494a4b4c4d4e4f',
'10111213141516'),
( '000102030405060708090a0b0c0d0e0f',
'202122232425262728292a2b2c2d2e2f',
'd2a1f0e051ea5f62081a7792073d593d',
'1fc64fbfaccd',
'404142434445464748494a4b4c4d4e4f',
'1011121314151617'),
( '000102030405060708090a0b0c0d0e0f10111213',
'202122232425262728292a2b2c2d2e2f3031323334353637',
'e3b201a9f5b71a7a9b1ceaeccd97e70b6176aad9a4428aa5',
'484392fbc1b09951',
'404142434445464748494a4b4c4d4e4f',
'101112131415161718191a1b'),
( (''.join(["%02X" % (x*16+y) for x in range(0,16) for y in range(0,16)]))*256,
'202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f',
'69915dad1e84c6376a68c2967e4dab615ae0fd1faec44cc484828529463ccf72',
'b4ac6bec93e8598e7f0dadbcea5b',
'404142434445464748494a4b4c4d4e4f',
'101112131415161718191a1b1c'),
# RFC3610
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e',
'588c979a61c663d2f066d0c2c0f989806d5f6b61dac384',
'17e8d12cfdf926e0',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000003020100a0a1a2a3a4a5'),
(
'0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
'72c91a36e135f8cf291ca894085c87e3cc15c439c9e43a3b',
'a091d56e10400916',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000004030201a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'51b1e5f44a197d1da46b0f8e2d282ae871e838bb64da859657',
'4adaa76fbd9fb0c5',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000005040302A0A1A2A3A4A5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e',
'a28c6865939a9a79faaa5c4c2a9d4a91cdac8c',
'96c861b9c9e61ef1',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000006050403a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f',
'dcf1fb7b5d9e23fb9d4e131253658ad86ebdca3e',
'51e83f077d9c2d93',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000007060504a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'6fc1b011f006568b5171a42d953d469b2570a4bd87',
'405a0443ac91cb94',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000008070605a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e',
'0135d1b2c95f41d5d1d4fec185d166b8094e999dfed96c',
'048c56602c97acbb7490',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'00000009080706a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f',
'7b75399ac0831dd2f0bbd75879a2fd8f6cae6b6cd9b7db24',
'c17b4433f434963f34b4',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000a090807a0a1a2a3a4a5'),
( '0001020304050607',
'08090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'82531a60cc24945a4b8279181ab5c84df21ce7f9b73f42e197',
'ea9c07e56b5eb17e5f4e',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000b0a0908a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e',
'07342594157785152b074098330abb141b947b',
'566aa9406b4d999988dd',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000c0b0a09a0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f',
'676bb20380b0e301e8ab79590a396da78b834934',
'f53aa2e9107a8b6c022c',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000d0c0b0aa0a1a2a3a4a5'),
( '000102030405060708090a0b',
'0c0d0e0f101112131415161718191a1b1c1d1e1f20',
'c0ffa0d6f05bdb67f24d43a4338d2aa4bed7b20e43',
'cd1aa31662e7ad65d6db',
'c0c1c2c3c4c5c6c7c8c9cacbcccdcecf',
'0000000e0d0c0ba0a1a2a3a4a5'),
( '0be1a88bace018b1',
'08e8cf97d820ea258460e96ad9cf5289054d895ceac47c',
'4cb97f86a2a4689a877947ab8091ef5386a6ffbdd080f8',
'e78cf7cb0cddd7b3',
'd7828d13b2b0bdc325a76236df93cc6b',
'00412b4ea9cdbe3c9696766cfa'),
( '63018f76dc8a1bcb',
'9020ea6f91bdd85afa0039ba4baff9bfb79c7028949cd0ec',
'4ccb1e7ca981befaa0726c55d378061298c85c92814abc33',
'c52ee81d7d77c08a',
'd7828d13b2b0bdc325a76236df93cc6b',
'0033568ef7b2633c9696766cfa'),
( 'aa6cfa36cae86b40',
'b916e0eacc1c00d7dcec68ec0b3bbb1a02de8a2d1aa346132e',
'b1d23a2220ddc0ac900d9aa03c61fcf4a559a4417767089708',
'a776796edb723506',
'd7828d13b2b0bdc325a76236df93cc6b',
'00103fe41336713c9696766cfa'),
( 'd0d0735c531e1becf049c244',
'12daac5630efa5396f770ce1a66b21f7b2101c',
'14d253c3967b70609b7cbb7c49916028324526',
'9a6f49975bcadeaf',
'd7828d13b2b0bdc325a76236df93cc6b',
'00764c63b8058e3c9696766cfa'),
( '77b60f011c03e1525899bcae',
'e88b6a46c78d63e52eb8c546efb5de6f75e9cc0d',
'5545ff1a085ee2efbf52b2e04bee1e2336c73e3f',
'762c0c7744fe7e3c',
'd7828d13b2b0bdc325a76236df93cc6b',
'00f8b678094e3b3c9696766cfa'),
( 'cd9044d2b71fdb8120ea60c0',
'6435acbafb11a82e2f071d7ca4a5ebd93a803ba87f',
'009769ecabdf48625594c59251e6035722675e04c8',
'47099e5ae0704551',
'd7828d13b2b0bdc325a76236df93cc6b',
'00d560912d3f703c9696766cfa'),
( 'd85bc7e69f944fb8',
'8a19b950bcf71a018e5e6701c91787659809d67dbedd18',
'bc218daa947427b6db386a99ac1aef23ade0b52939cb6a',
'637cf9bec2408897c6ba',
'd7828d13b2b0bdc325a76236df93cc6b',
'0042fff8f1951c3c9696766cfa'),
( '74a0ebc9069f5b37',
'1761433c37c5a35fc1f39f406302eb907c6163be38c98437',
'5810e6fd25874022e80361a478e3e9cf484ab04f447efff6',
'f0a477cc2fc9bf548944',
'd7828d13b2b0bdc325a76236df93cc6b',
'00920f40e56cdc3c9696766cfa'),
( '44a3aa3aae6475ca',
'a434a8e58500c6e41530538862d686ea9e81301b5ae4226bfa',
'f2beed7bc5098e83feb5b31608f8e29c38819a89c8e776f154',
'4d4151a4ed3a8b87b9ce',
'd7828d13b2b0bdc325a76236df93cc6b',
'0027ca0c7120bc3c9696766cfa'),
( 'ec46bb63b02520c33c49fd70',
'b96b49e21d621741632875db7f6c9243d2d7c2',
'31d750a09da3ed7fddd49a2032aabf17ec8ebf',
'7d22c8088c666be5c197',
'd7828d13b2b0bdc325a76236df93cc6b',
'005b8ccbcd9af83c9696766cfa'),
( '47a65ac78b3d594227e85e71',
'e2fcfbb880442c731bf95167c8ffd7895e337076',
'e882f1dbd38ce3eda7c23f04dd65071eb41342ac',
'df7e00dccec7ae52987d',
'd7828d13b2b0bdc325a76236df93cc6b',
'003ebe94044b9a3c9696766cfa'),
( '6e37a6ef546d955d34ab6059',
'abf21c0b02feb88f856df4a37381bce3cc128517d4',
'f32905b88a641b04b9c9ffb58cc390900f3da12ab1',
'6dce9e82efa16da62059',
'd7828d13b2b0bdc325a76236df93cc6b',
'008d493b30ae8b3c9696766cfa'),
]
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_CCM, 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_CCM, 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, **extra_params):
unittest.TestCase.__init__(self)
self._wycheproof_warnings = wycheproof_warnings
self._extra_params = extra_params
self._id = "None"
def setUp(self):
def filter_tag(group):
return group['tagSize'] // 8
self.tv = load_test_vectors_wycheproof(("Cipher", "wycheproof"),
"aes_ccm_test.json",
"Wycheproof AES CCM",
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 CCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e):
assert not tv.valid
return
if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e):
assert not tv.valid
return
raise e
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 CCM Test #" + str(tv.id)
try:
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
except ValueError as e:
if len(tv.iv) not in range(7, 13 + 1, 2) and "Length of parameter 'nonce'" in str(e):
assert not tv.valid
return
if tv.tag_size not in range(4, 16 + 1, 2) and "Parameter 'mac_len'" in str(e):
assert not tv.valid
return
raise e
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 CCM Test #" + str(tv.id)
if len(tv.iv) not in range(7, 13 + 1, 2) or len(tv.ct) == 0:
return
cipher = AES.new(tv.key, AES.MODE_CCM, tv.iv, mac_len=tv.tag_size,
**self._extra_params)
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)
def get_tests(config={}):
wycheproof_warnings = config.get('wycheproof_warnings')
tests = []
tests += list_test_cases(CcmTests)
tests += list_test_cases(CcmFSMTests)
tests += [TestVectors()]
tests += [TestVectorsWycheproof(wycheproof_warnings)]
return tests
if __name__ == '__main__':
def suite():
unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
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