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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
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#
# 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
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# ===================================================================
import unittest
from binascii import unhexlify
from Crypto.SelfTest.st_common import list_test_cases
from Crypto.Util.py3compat import tobytes
from Crypto.Cipher import AES, DES3, DES
from Crypto.Hash import SHAKE128
from Crypto.SelfTest.loader import load_test_vectors_wycheproof
def get_tag_random(tag, length):
return SHAKE128.new(data=tobytes(tag)).read(length)
from Crypto.SelfTest.Cipher.test_CBC import BlockChainingTests
class OfbTests(BlockChainingTests):
aes_mode = AES.MODE_OFB
des3_mode = DES3.MODE_OFB
# Redefine test_unaligned_data_128/64
def test_unaligned_data_128(self):
plaintexts = [ b"7777777" ] * 100
cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=8)
ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=8)
self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=128)
ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
cipher = AES.new(self.key_128, AES.MODE_CFB, self.iv_128, segment_size=128)
self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
def test_unaligned_data_64(self):
plaintexts = [ b"7777777" ] * 100
cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=8)
ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=8)
self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=64)
ciphertexts = [ cipher.encrypt(x) for x in plaintexts ]
cipher = DES3.new(self.key_192, DES3.MODE_CFB, self.iv_64, segment_size=64)
self.assertEqual(b"".join(ciphertexts), cipher.encrypt(b"".join(plaintexts)))
from Crypto.SelfTest.Cipher.test_CBC import NistBlockChainingVectors
class NistOfbVectors(NistBlockChainingVectors):
aes_mode = AES.MODE_OFB
des_mode = DES.MODE_OFB
des3_mode = DES3.MODE_OFB
# Create one test method per file
nist_aes_kat_mmt_files = (
# KAT
"OFBGFSbox128.rsp",
"OFBGFSbox192.rsp",
"OFBGFSbox256.rsp",
"OFBKeySbox128.rsp",
"OFBKeySbox192.rsp",
"OFBKeySbox256.rsp",
"OFBVarKey128.rsp",
"OFBVarKey192.rsp",
"OFBVarKey256.rsp",
"OFBVarTxt128.rsp",
"OFBVarTxt192.rsp",
"OFBVarTxt256.rsp",
# MMT
"OFBMMT128.rsp",
"OFBMMT192.rsp",
"OFBMMT256.rsp",
)
nist_aes_mct_files = (
"OFBMCT128.rsp",
"OFBMCT192.rsp",
"OFBMCT256.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(NistOfbVectors, "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(NistOfbVectors, "test_AES_" + file_name, new_func)
del file_name, new_func
nist_tdes_files = (
"TOFBMMT2.rsp", # 2TDES
"TOFBMMT3.rsp", # 3TDES
"TOFBinvperm.rsp", # Single DES
"TOFBpermop.rsp",
"TOFBsubtab.rsp",
"TOFBvarkey.rsp",
"TOFBvartext.rsp",
)
for file_name in nist_tdes_files:
def new_func(self, file_name=file_name):
self._do_tdes_test(file_name)
setattr(NistOfbVectors, "test_TDES_" + file_name, new_func)
# END OF NIST OFB TEST VECTORS
class SP800TestVectors(unittest.TestCase):
"""Class exercising the OFB test vectors found in Section F.4
of NIST SP 800-3A"""
def test_aes_128(self):
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = '3b3fd92eb72dad20333449f8e83cfb4a' +\
'7789508d16918f03f53c52dac54ed825' +\
'9740051e9c5fecf64344f7a82260edcc' +\
'304c6528f659c77866a510d9c1d6ae5e'
key = '2b7e151628aed2a6abf7158809cf4f3c'
iv = '000102030405060708090a0b0c0d0e0f'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
def test_aes_192(self):
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = 'cdc80d6fddf18cab34c25909c99a4174' +\
'fcc28b8d4c63837c09e81700c1100401' +\
'8d9a9aeac0f6596f559c6d4daf59a5f2' +\
'6d9f200857ca6c3e9cac524bd9acc92a'
key = '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
iv = '000102030405060708090a0b0c0d0e0f'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
def test_aes_256(self):
plaintext = '6bc1bee22e409f96e93d7e117393172a' +\
'ae2d8a571e03ac9c9eb76fac45af8e51' +\
'30c81c46a35ce411e5fbc1191a0a52ef' +\
'f69f2445df4f9b17ad2b417be66c3710'
ciphertext = 'dc7e84bfda79164b7ecd8486985d3860' +\
'4febdc6740d20b3ac88f6ad82a4fb08d' +\
'71ab47a086e86eedf39d1c5bba97c408' +\
'0126141d67f37be8538f5a8be740e484'
key = '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4'
iv = '000102030405060708090a0b0c0d0e0f'
key = unhexlify(key)
iv = unhexlify(iv)
plaintext = unhexlify(plaintext)
ciphertext = unhexlify(ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext), ciphertext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext), plaintext)
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.encrypt(plaintext[:-8]), ciphertext[:-8])
cipher = AES.new(key, AES.MODE_OFB, iv)
self.assertEqual(cipher.decrypt(ciphertext[:-8]), plaintext[:-8])
def get_tests(config={}):
tests = []
tests += list_test_cases(OfbTests)
if config.get('slow_tests'):
tests += list_test_cases(NistOfbVectors)
tests += list_test_cases(SP800TestVectors)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')