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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.SelfTest.loader import load_test_vectors
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.py3compat import tobytes, is_string
from Crypto.Cipher import AES, DES3, DES
from Crypto.Hash import SHAKE128
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
class BlockChainingTests(unittest.TestCase):
key_128 = get_tag_random("key_128", 16)
key_192 = get_tag_random("key_192", 24)
iv_128 = get_tag_random("iv_128", 16)
iv_64 = get_tag_random("iv_64", 8)
data_128 = get_tag_random("data_128", 16)
def test_loopback_128(self):
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
pt = get_tag_random("plaintext", 16 * 100)
ct = cipher.encrypt(pt)
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_loopback_64(self):
cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
pt = get_tag_random("plaintext", 8 * 100)
ct = cipher.encrypt(pt)
cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
pt2 = cipher.decrypt(ct)
self.assertEqual(pt, pt2)
def test_iv(self):
# If not passed, the iv is created randomly
cipher = AES.new(self.key_128, self.aes_mode)
iv1 = cipher.iv
cipher = AES.new(self.key_128, self.aes_mode)
iv2 = cipher.iv
self.assertNotEqual(iv1, iv2)
self.assertEqual(len(iv1), 16)
# IV can be passed in uppercase or lowercase
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
ct = cipher.encrypt(self.data_128)
cipher = AES.new(self.key_128, self.aes_mode, iv=self.iv_128)
self.assertEqual(ct, cipher.encrypt(self.data_128))
cipher = AES.new(self.key_128, self.aes_mode, IV=self.iv_128)
self.assertEqual(ct, cipher.encrypt(self.data_128))
def test_iv_must_be_bytes(self):
self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
iv = u'test1234567890-*')
def test_only_one_iv(self):
# Only one IV/iv keyword allowed
self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
iv=self.iv_128, IV=self.iv_128)
def test_iv_with_matching_length(self):
self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
b"")
self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
self.iv_128[:15])
self.assertRaises(ValueError, AES.new, self.key_128, self.aes_mode,
self.iv_128 + b"0")
def test_block_size_128(self):
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
self.assertEqual(cipher.block_size, AES.block_size)
def test_block_size_64(self):
cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
self.assertEqual(cipher.block_size, DES3.block_size)
def test_unaligned_data_128(self):
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
for wrong_length in range(1,16):
self.assertRaises(ValueError, cipher.encrypt, b"5" * wrong_length)
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
for wrong_length in range(1,16):
self.assertRaises(ValueError, cipher.decrypt, b"5" * wrong_length)
def test_unaligned_data_64(self):
cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
for wrong_length in range(1,8):
self.assertRaises(ValueError, cipher.encrypt, b"5" * wrong_length)
cipher = DES3.new(self.key_192, self.des3_mode, self.iv_64)
for wrong_length in range(1,8):
self.assertRaises(ValueError, cipher.decrypt, b"5" * wrong_length)
def test_IV_iv_attributes(self):
data = get_tag_random("data", 16 * 100)
for func in "encrypt", "decrypt":
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
getattr(cipher, func)(data)
self.assertEqual(cipher.iv, self.iv_128)
self.assertEqual(cipher.IV, self.iv_128)
def test_unknown_parameters(self):
self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
self.iv_128, 7)
self.assertRaises(TypeError, AES.new, self.key_128, self.aes_mode,
iv=self.iv_128, 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, self.aes_mode, iv=self.iv_128, use_aesni=False)
def test_null_encryption_decryption(self):
for func in "encrypt", "decrypt":
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
result = getattr(cipher, func)(b"")
self.assertEqual(result, b"")
def test_either_encrypt_or_decrypt(self):
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
cipher.encrypt(b"")
self.assertRaises(TypeError, cipher.decrypt, b"")
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
cipher.decrypt(b"")
self.assertRaises(TypeError, cipher.encrypt, b"")
def test_data_must_be_bytes(self):
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
self.assertRaises(TypeError, cipher.encrypt, u'test1234567890-*')
cipher = AES.new(self.key_128, self.aes_mode, self.iv_128)
self.assertRaises(TypeError, cipher.decrypt, u'test1234567890-*')
def test_bytearray(self):
data = b"1" * 128
data_ba = bytearray(data)
# Encrypt
key_ba = bytearray(self.key_128)
iv_ba = bytearray(self.iv_128)
cipher1 = AES.new(self.key_128, self.aes_mode, self.iv_128)
ref1 = cipher1.encrypt(data)
cipher2 = AES.new(key_ba, self.aes_mode, iv_ba)
key_ba[:3] = b'\xFF\xFF\xFF'
iv_ba[:3] = b'\xFF\xFF\xFF'
ref2 = cipher2.encrypt(data_ba)
self.assertEqual(ref1, ref2)
self.assertEqual(cipher1.iv, cipher2.iv)
# Decrypt
key_ba = bytearray(self.key_128)
iv_ba = bytearray(self.iv_128)
cipher3 = AES.new(self.key_128, self.aes_mode, self.iv_128)
ref3 = cipher3.decrypt(data)
cipher4 = AES.new(key_ba, self.aes_mode, iv_ba)
key_ba[:3] = b'\xFF\xFF\xFF'
iv_ba[:3] = b'\xFF\xFF\xFF'
ref4 = cipher4.decrypt(data_ba)
self.assertEqual(ref3, ref4)
def test_memoryview(self):
data = b"1" * 128
data_mv = memoryview(bytearray(data))
# Encrypt
key_mv = memoryview(bytearray(self.key_128))
iv_mv = memoryview(bytearray(self.iv_128))
cipher1 = AES.new(self.key_128, self.aes_mode, self.iv_128)
ref1 = cipher1.encrypt(data)
cipher2 = AES.new(key_mv, self.aes_mode, iv_mv)
key_mv[:3] = b'\xFF\xFF\xFF'
iv_mv[:3] = b'\xFF\xFF\xFF'
ref2 = cipher2.encrypt(data_mv)
self.assertEqual(ref1, ref2)
self.assertEqual(cipher1.iv, cipher2.iv)
# Decrypt
key_mv = memoryview(bytearray(self.key_128))
iv_mv = memoryview(bytearray(self.iv_128))
cipher3 = AES.new(self.key_128, self.aes_mode, self.iv_128)
ref3 = cipher3.decrypt(data)
cipher4 = AES.new(key_mv, self.aes_mode, iv_mv)
key_mv[:3] = b'\xFF\xFF\xFF'
iv_mv[:3] = b'\xFF\xFF\xFF'
ref4 = cipher4.decrypt(data_mv)
self.assertEqual(ref3, ref4)
def test_output_param(self):
pt = b'5' * 128
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
ct = cipher.encrypt(pt)
output = bytearray(128)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
res = cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
self.assertEqual(res, None)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
res = cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
self.assertEqual(res, None)
def test_output_param_same_buffer(self):
pt = b'5' * 128
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
ct = cipher.encrypt(pt)
pt_ba = bytearray(pt)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
res = cipher.encrypt(pt_ba, output=pt_ba)
self.assertEqual(ct, pt_ba)
self.assertEqual(res, None)
ct_ba = bytearray(ct)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
res = cipher.decrypt(ct_ba, output=ct_ba)
self.assertEqual(pt, ct_ba)
self.assertEqual(res, None)
def test_output_param_memoryview(self):
pt = b'5' * 128
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
ct = cipher.encrypt(pt)
output = memoryview(bytearray(128))
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
cipher.encrypt(pt, output=output)
self.assertEqual(ct, output)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
cipher.decrypt(ct, output=output)
self.assertEqual(pt, output)
def test_output_param_neg(self):
LEN_PT = 128
pt = b'5' * LEN_PT
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
ct = cipher.encrypt(pt)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
self.assertRaises(TypeError, cipher.encrypt, pt, output=b'0' * LEN_PT)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
self.assertRaises(TypeError, cipher.decrypt, ct, output=b'0' * LEN_PT)
shorter_output = bytearray(LEN_PT - 1)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
self.assertRaises(ValueError, cipher.encrypt, pt, output=shorter_output)
cipher = AES.new(b'4'*16, self.aes_mode, iv=self.iv_128)
self.assertRaises(ValueError, cipher.decrypt, ct, output=shorter_output)
class CbcTests(BlockChainingTests):
aes_mode = AES.MODE_CBC
des3_mode = DES3.MODE_CBC
class NistBlockChainingVectors(unittest.TestCase):
def _do_kat_aes_test(self, file_name):
test_vectors = load_test_vectors(("Cipher", "AES"),
file_name,
"AES CBC KAT",
{ "count" : lambda x: int(x) } )
if test_vectors is None:
return
direction = None
for tv in test_vectors:
# The test vector file contains some directive lines
if is_string(tv):
direction = tv
continue
self.description = tv.desc
cipher = AES.new(tv.key, self.aes_mode, tv.iv)
if direction == "[ENCRYPT]":
self.assertEqual(cipher.encrypt(tv.plaintext), tv.ciphertext)
elif direction == "[DECRYPT]":
self.assertEqual(cipher.decrypt(tv.ciphertext), tv.plaintext)
else:
assert False
# See Section 6.4.2 in AESAVS
def _do_mct_aes_test(self, file_name):
test_vectors = load_test_vectors(("Cipher", "AES"),
file_name,
"AES CBC Montecarlo",
{ "count" : lambda x: int(x) } )
if test_vectors is None:
return
direction = None
for tv in test_vectors:
# The test vector file contains some directive lines
if is_string(tv):
direction = tv
continue
self.description = tv.desc
cipher = AES.new(tv.key, self.aes_mode, tv.iv)
if direction == '[ENCRYPT]':
cts = [ tv.iv ]
for count in range(1000):
cts.append(cipher.encrypt(tv.plaintext))
tv.plaintext = cts[-2]
self.assertEqual(cts[-1], tv.ciphertext)
elif direction == '[DECRYPT]':
pts = [ tv.iv]
for count in range(1000):
pts.append(cipher.decrypt(tv.ciphertext))
tv.ciphertext = pts[-2]
self.assertEqual(pts[-1], tv.plaintext)
else:
assert False
def _do_tdes_test(self, file_name):
test_vectors = load_test_vectors(("Cipher", "TDES"),
file_name,
"TDES CBC KAT",
{ "count" : lambda x: int(x) } )
if test_vectors is None:
return
direction = None
for tv in test_vectors:
# The test vector file contains some directive lines
if is_string(tv):
direction = tv
continue
self.description = tv.desc
if hasattr(tv, "keys"):
cipher = DES.new(tv.keys, self.des_mode, tv.iv)
else:
if tv.key1 != tv.key3:
key = tv.key1 + tv.key2 + tv.key3 # Option 3
else:
key = tv.key1 + tv.key2 # Option 2
cipher = DES3.new(key, self.des3_mode, tv.iv)
if direction == "[ENCRYPT]":
self.assertEqual(cipher.encrypt(tv.plaintext), tv.ciphertext)
elif direction == "[DECRYPT]":
self.assertEqual(cipher.decrypt(tv.ciphertext), tv.plaintext)
else:
assert False
class NistCbcVectors(NistBlockChainingVectors):
aes_mode = AES.MODE_CBC
des_mode = DES.MODE_CBC
des3_mode = DES3.MODE_CBC
# Create one test method per file
nist_aes_kat_mmt_files = (
# KAT
"CBCGFSbox128.rsp",
"CBCGFSbox192.rsp",
"CBCGFSbox256.rsp",
"CBCKeySbox128.rsp",
"CBCKeySbox192.rsp",
"CBCKeySbox256.rsp",
"CBCVarKey128.rsp",
"CBCVarKey192.rsp",
"CBCVarKey256.rsp",
"CBCVarTxt128.rsp",
"CBCVarTxt192.rsp",
"CBCVarTxt256.rsp",
# MMT
"CBCMMT128.rsp",
"CBCMMT192.rsp",
"CBCMMT256.rsp",
)
nist_aes_mct_files = (
"CBCMCT128.rsp",
"CBCMCT192.rsp",
"CBCMCT256.rsp",
)
for file_name in nist_aes_kat_mmt_files:
def new_func(self, file_name=file_name):
self._do_kat_aes_test(file_name)
setattr(NistCbcVectors, "test_AES_" + file_name, new_func)
for file_name in nist_aes_mct_files:
def new_func(self, file_name=file_name):
self._do_mct_aes_test(file_name)
setattr(NistCbcVectors, "test_AES_" + file_name, new_func)
del file_name, new_func
nist_tdes_files = (
"TCBCMMT2.rsp", # 2TDES
"TCBCMMT3.rsp", # 3TDES
"TCBCinvperm.rsp", # Single DES
"TCBCpermop.rsp",
"TCBCsubtab.rsp",
"TCBCvarkey.rsp",
"TCBCvartext.rsp",
)
for file_name in nist_tdes_files:
def new_func(self, file_name=file_name):
self._do_tdes_test(file_name)
setattr(NistCbcVectors, "test_TDES_" + file_name, new_func)
# END OF NIST CBC TEST VECTORS
class SP800TestVectors(unittest.TestCase):
"""Class exercising the CBC test vectors found in Section F.2
of NIST SP 800-3A"""
def test_aes_128(self):
key = '2b7e151628aed2a6abf7158809cf4f3c'
iv = '000102030405060708090a0b0c0d0e0f'
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = '7649abac8119b246cee98e9b12e9197d' +\
'5086cb9b507219ee95db113a917678b2' +\
'73bed6b8e3c1743b7116e69e22229516' +\
'3ff1caa1681fac09120eca307586e1a7'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
def test_aes_192(self):
key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
iv = '000102030405060708090a0b0c0d0e0f'
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = '4f021db243bc633d7178183a9fa071e8' +\
'b4d9ada9ad7dedf4e5e738763f69145a' +\
'571b242012fb7ae07fa9baac3df102e0' +\
'08b0e27988598881d920a9e64f5615cd'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
def test_aes_256(self):
key = '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4'
iv = '000102030405060708090a0b0c0d0e0f'
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = 'f58c4c04d6e5f1ba779eabfb5f7bfbd6' +\
'9cfc4e967edb808d679f777bc6702c7d' +\
'39f23369a9d9bacfa530e26304231461' +\
'b2eb05e2c39be9fcda6c19078c6a9d1b'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_CBC, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
def get_tests(config={}):
tests = []
tests += list_test_cases(CbcTests)
if config.get('slow_tests'):
tests += list_test_cases(NistCbcVectors)
tests += list_test_cases(SP800TestVectors)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')