box-o-sand/itest_onetimepad.py

import unittest
import onetimepad as OT


class TestOneTimePad(unittest.TestCase):
    msg = ('HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFA'
           'WOODCHUCKCOULDCHUCKWOOD' * 50)
    _padsize = 2000

    def test_mk_as_alpha_excludes_j(self):
        self.assertTrue('J' not in OT._AS_ALPHA.values())

    def test_mk_as_alpha_dict_has_25_members(self):
        self.assertEqual(25, len(OT._AS_ALPHA.items()))

    def test_creates_pad_of_desired_length(self):
        for width in (72, 33, 99, 111):
            pad = OT.create_pad(self._padsize, width=width)
            lines = [line.strip('.') for line in pad.split()]
            actual = len(''.join(lines))
            self.assertEqual(self._padsize, len(''.join(lines)),
                             'pad of {0} chars created at width '
                             '{1}, actual={2}'.format(self._padsize,
                                                      width, actual))

    def test_get_randint_on_nonexistent_randomness_file_fails_ioerror(self):
        OT._DEV_RANDOM['fp'] = None
        self.assertRaises(IOError, OT._get_randint,
                          randomness_file='/foo/bar/busted/borken',
                          fallback_to_fake=False)

    def test_get_randint_on_nonexistent_randomness_file_uses_fake(self):
        OT._DEV_RANDOM['fp'] = None
        random_int = OT._get_randint(randomness_file='/broke/as/joke')
        self.assertTrue(random_int in range(0, 255))

    def test_is_padline(self):
        for lineno in PADLINES:
            self.assertTrue(OT._is_padline(lineno),
                            'line {0} is padline'.format(lineno))
        for lineno in TEXTLINES:
            self.assertFalse(OT._is_padline(lineno),
                             'line {0} is not padline'.format(lineno))
        for lineno in CIPHERLINES:
            self.assertFalse(OT._is_padline(lineno),
                             'line {0} is not padline'.format(lineno))

    def test_is_textline(self):
        for lineno in TEXTLINES:
            self.assertTrue(OT._is_textline(lineno),
                            'line {0} is textline'.format(lineno))
        for lineno in PADLINES:
            self.assertFalse(OT._is_textline(lineno),
                             'line {0} is not textline'.format(lineno))
        for lineno in CIPHERLINES:
            self.assertFalse(OT._is_textline(lineno),
                             'line {0} is not textline'.format(lineno))

    def test_is_cipherline(self):
        for lineno in CIPHERLINES:
            self.assertTrue(OT._is_cipherline(lineno),
                            'line {0} is cipherline'.format(lineno))
        for lineno in PADLINES:
            self.assertFalse(OT._is_cipherline(lineno),
                             'line {0} is not cipherline'.format(lineno))
        for lineno in TEXTLINES:
            self.assertFalse(OT._is_cipherline(lineno),
                             'line {0} is not cipherline'.format(lineno))

    def test_make_cipherline_from_padline_and_textline(self):
        actual = OT._cipherline_from_padline_and_textline(TEST_PADLINE,
                                                          TEST_TEXTLINE)
        self.assertEqual(TEST_CIPHERLINE, actual)

    def test_make_textline_from_cipherline_and_padline(self):
        actual = OT._textline_from_cipherline_and_padline(TEST_CIPHERLINE,
                                                          TEST_PADLINE)
        self.assertEqual(TEST_TEXTLINE, actual)

    def test_encode_equals_expected(self):
        ciphertext = OT.encode(TEST_MSG, TEST_PAD)
        self.assertEqual(TEST_CIPHER, ciphertext)

    def test_decode_equals_expected(self):
        text = OT.decode(TEST_CIPHER, TEST_PAD)
        self.assertEqual(TEST_MSG, text)


PADLINES = (1, 4, 7, 10, 13, 16, 19, 22, 25)
TEXTLINES = (2, 5, 8, 11, 14, 17, 20, 23, 26)
CIPHERLINES = (3, 6, 9, 12, 15, 18, 21, 24, 27)

TEST_PADLINE = 'HUCHUGGHOBUXADDHOHPGQBKXQKAOLRL'
TEST_TEXTLINE = 'THISCAKEISUNSATISFACTORYTOMEYES'
TEST_CIPHERLINE = 'BCMAXHRNXUPLTEXRGOQKKQBWKYNTKWD'

TEST_MSG = \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
    'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOO'

TEST_CIPHER = \
    'FMHZRGHRITAMHVAOLBANWMNYPBYDCFCAVXAEEKXUTYXLUCYQVYPWZFSKYI' \
    'LWKCHZSXLFCMZIEFHXKVUXVNBIQVSNYPTFVIZHSVTDCKWUSZHEHUPLZSUY' \
    'BTPSMEISGTYDWCXVUCPGHHKXDOUHGCVDTDUQVKFDRDCHFIKTNFGDFODCQS' \
    'RIWGZBLPTCSXLMPQODYLHQNGWNSCTHNDOZEUXWCEQAZMRGZIQUTUYSKOGW' \
    'YGYPEDNUZDWBEPUHLWWBHLGADYTCNGEUFKPLQSAMMXCTXWQEOYBNKQAHBV' \
    'PDKTMQSHDFCFBCVKXVTRSXRTBHAGKNLFASNVNENHHRNGCKXALMIBNZKOTL' \
    'BZMWGSNMTLDNPXKVQZZUAZCSPWFNRKAMTNMCPHWGLGBVSNFDXSKVUFBZBW' \
    'WICBUPCWZDUXCZTXHKQBMQNTBHAAGMBPKUIDTHITUEWEPPMACPXERXRYND' \
    'RWQSBQQMSQRVWZMAQQKUGHLELKFLKHGNFFDHIWUZPDIMIOELSIHMUIZQCW' \
    'KLPZQIFAXNDRRIIIHOYBGSCIYBIVSRTECEOZSBLYTNCXGQXEWMGIXHKBIL' \
    'TOKWHGABPMXNAHEWFKIMOQPHVHSYZABWLMLSSDEHQIBNEMEMHCWOUBIIZS' \
    'XPFWXMQNOTEANYGQBVMZAXNPAMWSUOGFAFFYUTKDZYHFTPYGOMDHESKOZI' \
    'IPDXAMSAQOTGAQKYPYWWUYGHSBVODAHDSKDVPMLWRCXQXGAXQZBFNKXFKU' \
    'WUDRWNRKECIQIUEEMQNCAZDDDOQOEGUVFVCTKLTISNOQILEKUYXCYZNHHZ' \
    'OFHCSLOPPQAFLHHDZANGTXNQSDZSAFLLSGWULVHIDERMTZZHTDHTZPHEFN' \
    'ORDEIYOVTTAWVTOOXSLZBOPMRCCKSMHQOVFERCOVUMWXFSNEMFALNWGRQC' \
    'NLWELLXNCHZGXQEUGEVNCWMHRNGUTBKTVEXGASBRCEBSFITOEFSNIBTLME' \
    'MERMOFVBNTFCTTWEGAIGRZQBBFOKOPXNCWXFBK'

TEST_PAD = """\
XXLNWDZOAYXBEGFCGADYHHKQUYOAULZQMRZHQVTRLDUARODERVGBWVVVKECHNQNWKUCLZBWU


KUDWNGFTSEGFFSKSVEKZUMLTOSLIZZTFXODBZZMACDFUTESFRBAPYYVTTOCKQBSSTDGPILKE


YHSTKXTTGVBAIIZXCUPHICYICDGOBOIUZUEYCMLHPNHXUEKCBWTMKYBKHZLNKTETDXIHYBHF


WBOSEXMRLZVHNZSSQSBCKAERRITRBAZWGVZNTGDSIVIZEMBKWDOOBDWIDCZIUHVTKVTSGFDT


NRGPNGRNKEVLZVYOAYTUWCDTOLGEQDBSHVRMMYYQIEZWKWZVCPGIAGKPNZEGTLPKMPEILQAC


MIPKMYCFMVZKUTVKIPXBKGLFATSDCMYLPYLSTPBARVELNSOUFPZMUTRIRNZLYMDITNXMKLGE


QXYRYEAOHGETEQMKTUMARPYMPKONUKYZIHTFGNHIKVOLTLRPMPNFSDHWQGVHBNDCWZCLUHQW


GIFBFZKZOFZRRYCBOSBWSNVFXXPSAGOUOXDNBNSOZADYYSKWQUTYNCDNGVLSZNDBCTSIYOUX


NNUGLZNKNDSYGRUCXTKLBIMXZMMZAEHVRFYMBFKVDPAEHOYCBXKADZOTRRMULOPAIKCIHKFY


BQKKMEXUPLMTKGFIMPMTDVRZEBFEFARDEVQADVKIVNBHNZLEAAGLFIKXHTQWXBPNLXZHFUDZ


XYLLVFETIDCYAXGTIHUFUSFMMWTLKZARVQOFGEBKIGWHFFFFKTHPQOMVAVILFLWMRLWPBWVW


PFKSLFFWKYQVPHVPQTTVFRLQXHFMGVXVHTNSVZQSETKHXAPPSLHAIAVXWGDFVKOBQLEWPAZY


WELQRIFCGSOVFSLYXMSETCTROLNKMDWZSGKREFEPEHCOKSMRTNCDSTHCSQKMKCBYEWZSQHPK


UNWWUBKICDYYOSIZWKWRLGGIMYWKMDXOUKYHCUYCACKSFRWWXADQUZTCNYEYCSQEBTCZMSCV


NTGCDGFUUCTQWINV........................................................

"""


if __name__ == '__main__':
    unittest.main()