beginning process of "making it right", enclosing mod 25 one-time pad stuff in its own class
This commit is contained in:
Dan Buch
parent
e0d5e608f9
commit
b932174e34
@ -2,20 +2,117 @@ import unittest
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import onetimepad as OT
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class TestOneTimePad(unittest.TestCase):
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class TestMod25(unittest.TestCase):
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msg = ('HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFA'
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'WOODCHUCKCOULDCHUCKWOOD' * 50)
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_padsize = 2000
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PADLINES = (1, 4, 7, 10, 13, 16, 19, 22, 25)
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TEXTLINES = (2, 5, 8, 11, 14, 17, 20, 23, 26)
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CIPHERLINES = (3, 6, 9, 12, 15, 18, 21, 24, 27)
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TEST_PADLINE = 'HUCHUGGHOBUXADDHOHPGQBKXQKAOLRL'
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TEST_TEXTLINE = 'THISCAKEISUNSATISFACTORYTOMEYES'
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TEST_CIPHERLINE = 'BCMAXHRNXUPLTEXRGOQKKQBWKYNTKWD'
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TEST_MSG = \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOO'
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TEST_CIPHER = \
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'FMHZRGHRITAMHVAOLBANWMNYPBYDCFCAVXAEEKXUTYXLUCYQVYPWZFSKYI' \
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'LWKCHZSXLFCMZIEFHXKVUXVNBIQVSNYPTFVIZHSVTDCKWUSZHEHUPLZSUY' \
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'BTPSMEISGTYDWCXVUCPGHHKXDOUHGCVDTDUQVKFDRDCHFIKTNFGDFODCQS' \
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'RIWGZBLPTCSXLMPQODYLHQNGWNSCTHNDOZEUXWCEQAZMRGZIQUTUYSKOGW' \
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'YGYPEDNUZDWBEPUHLWWBHLGADYTCNGEUFKPLQSAMMXCTXWQEOYBNKQAHBV' \
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'PDKTMQSHDFCFBCVKXVTRSXRTBHAGKNLFASNVNENHHRNGCKXALMIBNZKOTL' \
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'BZMWGSNMTLDNPXKVQZZUAZCSPWFNRKAMTNMCPHWGLGBVSNFDXSKVUFBZBW' \
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'WICBUPCWZDUXCZTXHKQBMQNTBHAAGMBPKUIDTHITUEWEPPMACPXERXRYND' \
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'RWQSBQQMSQRVWZMAQQKUGHLELKFLKHGNFFDHIWUZPDIMIOELSIHMUIZQCW' \
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'KLPZQIFAXNDRRIIIHOYBGSCIYBIVSRTECEOZSBLYTNCXGQXEWMGIXHKBIL' \
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'TOKWHGABPMXNAHEWFKIMOQPHVHSYZABWLMLSSDEHQIBNEMEMHCWOUBIIZS' \
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'XPFWXMQNOTEANYGQBVMZAXNPAMWSUOGFAFFYUTKDZYHFTPYGOMDHESKOZI' \
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'IPDXAMSAQOTGAQKYPYWWUYGHSBVODAHDSKDVPMLWRCXQXGAXQZBFNKXFKU' \
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'WUDRWNRKECIQIUEEMQNCAZDDDOQOEGUVFVCTKLTISNOQILEKUYXCYZNHHZ' \
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'OFHCSLOPPQAFLHHDZANGTXNQSDZSAFLLSGWULVHIDERMTZZHTDHTZPHEFN' \
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'ORDEIYOVTTAWVTOOXSLZBOPMRCCKSMHQOVFERCOVUMWXFSNEMFALNWGRQC' \
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'NLWELLXNCHZGXQEUGEVNCWMHRNGUTBKTVEXGASBRCEBSFITOEFSNIBTLME' \
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'MERMOFVBNTFCTTWEGAIGRZQBBFOKOPXNCWXFBK'
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TEST_PAD = """\
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XXLNWDZOAYXBEGFCGADYHHKQUYOAULZQMRZHQVTRLDUARODERVGBWVVVKECHNQNWKUCLZBWU
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KUDWNGFTSEGFFSKSVEKZUMLTOSLIZZTFXODBZZMACDFUTESFRBAPYYVTTOCKQBSSTDGPILKE
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YHSTKXTTGVBAIIZXCUPHICYICDGOBOIUZUEYCMLHPNHXUEKCBWTMKYBKHZLNKTETDXIHYBHF
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WBOSEXMRLZVHNZSSQSBCKAERRITRBAZWGVZNTGDSIVIZEMBKWDOOBDWIDCZIUHVTKVTSGFDT
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NRGPNGRNKEVLZVYOAYTUWCDTOLGEQDBSHVRMMYYQIEZWKWZVCPGIAGKPNZEGTLPKMPEILQAC
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MIPKMYCFMVZKUTVKIPXBKGLFATSDCMYLPYLSTPBARVELNSOUFPZMUTRIRNZLYMDITNXMKLGE
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QXYRYEAOHGETEQMKTUMARPYMPKONUKYZIHTFGNHIKVOLTLRPMPNFSDHWQGVHBNDCWZCLUHQW
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GIFBFZKZOFZRRYCBOSBWSNVFXXPSAGOUOXDNBNSOZADYYSKWQUTYNCDNGVLSZNDBCTSIYOUX
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NNUGLZNKNDSYGRUCXTKLBIMXZMMZAEHVRFYMBFKVDPAEHOYCBXKADZOTRRMULOPAIKCIHKFY
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BQKKMEXUPLMTKGFIMPMTDVRZEBFEFARDEVQADVKIVNBHNZLEAAGLFIKXHTQWXBPNLXZHFUDZ
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XYLLVFETIDCYAXGTIHUFUSFMMWTLKZARVQOFGEBKIGWHFFFFKTHPQOMVAVILFLWMRLWPBWVW
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PFKSLFFWKYQVPHVPQTTVFRLQXHFMGVXVHTNSVZQSETKHXAPPSLHAIAVXWGDFVKOBQLEWPAZY
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WELQRIFCGSOVFSLYXMSETCTROLNKMDWZSGKREFEPEHCOKSMRTNCDSTHCSQKMKCBYEWZSQHPK
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UNWWUBKICDYYOSIZWKWRLGGIMYWKMDXOUKYHCUYCACKSFRWWXADQUZTCNYEYCSQEBTCZMSCV
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NTGCDGFUUCTQWINV........................................................
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"""
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def setUp(self):
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self.m25 = OT.Mod25()
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def test_mk_as_alpha_excludes_j(self):
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self.assertTrue('J' not in OT._AS_ALPHA.values())
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self.assertTrue('J' not in self.m25._as_alpha.values())
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def test_mk_as_alpha_dict_has_25_members(self):
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self.assertEqual(25, len(OT._AS_ALPHA.items()))
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self.assertEqual(25, len(self.m25._as_alpha.items()))
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def test_creates_pad_of_desired_length(self):
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for width in (72, 33, 99, 111):
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pad = OT.create_pad(self._padsize, width=width)
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pad = self.m25.create_pad(self._padsize, width=width)
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lines = [line.strip('.') for line in pad.split()]
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actual = len(''.join(lines))
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self.assertEqual(self._padsize, len(''.join(lines)),
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@ -23,163 +120,71 @@ class TestOneTimePad(unittest.TestCase):
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'{1}, actual={2}'.format(self._padsize,
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width, actual))
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def test_get_randint_on_nonexistent_randomness_file_fails_ioerror(self):
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OT._DEV_RANDOM['fp'] = None
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self.assertRaises(IOError, OT._get_randint,
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randomness_file='/foo/bar/busted/borken',
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fallback_to_fake=False)
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def test_get_randint_on_nonexistent_randomness_file_uses_fake(self):
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OT._DEV_RANDOM['fp'] = None
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random_int = OT._get_randint(randomness_file='/broke/as/joke')
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self.assertTrue(random_int in range(0, 255))
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def test_is_padline(self):
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for lineno in PADLINES:
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self.assertTrue(OT._is_padline(lineno),
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for lineno in self.PADLINES:
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self.assertTrue(self.m25._is_padline(lineno),
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'line {0} is padline'.format(lineno))
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for lineno in TEXTLINES:
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self.assertFalse(OT._is_padline(lineno),
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for lineno in self.TEXTLINES:
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self.assertFalse(self.m25._is_padline(lineno),
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'line {0} is not padline'.format(lineno))
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for lineno in CIPHERLINES:
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self.assertFalse(OT._is_padline(lineno),
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for lineno in self.CIPHERLINES:
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self.assertFalse(self.m25._is_padline(lineno),
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'line {0} is not padline'.format(lineno))
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def test_is_textline(self):
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for lineno in TEXTLINES:
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self.assertTrue(OT._is_textline(lineno),
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for lineno in self.TEXTLINES:
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self.assertTrue(self.m25._is_textline(lineno),
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'line {0} is textline'.format(lineno))
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for lineno in PADLINES:
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self.assertFalse(OT._is_textline(lineno),
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for lineno in self.PADLINES:
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self.assertFalse(self.m25._is_textline(lineno),
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'line {0} is not textline'.format(lineno))
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for lineno in CIPHERLINES:
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self.assertFalse(OT._is_textline(lineno),
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for lineno in self.CIPHERLINES:
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self.assertFalse(self.m25._is_textline(lineno),
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'line {0} is not textline'.format(lineno))
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def test_is_cipherline(self):
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for lineno in CIPHERLINES:
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self.assertTrue(OT._is_cipherline(lineno),
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for lineno in self.CIPHERLINES:
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self.assertTrue(self.m25._is_cipherline(lineno),
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'line {0} is cipherline'.format(lineno))
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for lineno in PADLINES:
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self.assertFalse(OT._is_cipherline(lineno),
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for lineno in self.PADLINES:
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self.assertFalse(self.m25._is_cipherline(lineno),
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'line {0} is not cipherline'.format(lineno))
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for lineno in TEXTLINES:
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self.assertFalse(OT._is_cipherline(lineno),
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for lineno in self.TEXTLINES:
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self.assertFalse(self.m25._is_cipherline(lineno),
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'line {0} is not cipherline'.format(lineno))
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def test_make_cipherline_from_padline_and_textline(self):
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actual = OT._cipherline_from_padline_and_textline(TEST_PADLINE,
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TEST_TEXTLINE)
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self.assertEqual(TEST_CIPHERLINE, actual)
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actual = \
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self.m25._cipherline_from_padline_and_textline(self.TEST_PADLINE,
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self.TEST_TEXTLINE)
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self.assertEqual(self.TEST_CIPHERLINE, actual)
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def test_make_textline_from_cipherline_and_padline(self):
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actual = OT._textline_from_cipherline_and_padline(TEST_CIPHERLINE,
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TEST_PADLINE)
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self.assertEqual(TEST_TEXTLINE, actual)
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actual = self.m25._textline_from_cipherline_and_padline(
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self.TEST_CIPHERLINE, self.TEST_PADLINE)
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self.assertEqual(self.TEST_TEXTLINE, actual)
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def test_encode_equals_expected(self):
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ciphertext = OT.encode(TEST_MSG, TEST_PAD)
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self.assertEqual(TEST_CIPHER, ciphertext)
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ciphertext = OT.mod25encode(self.TEST_MSG, self.TEST_PAD)
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self.assertEqual(self.TEST_CIPHER, ciphertext)
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def test_decode_equals_expected(self):
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text = OT.decode(TEST_CIPHER, TEST_PAD)
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self.assertEqual(TEST_MSG, text)
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text = OT.mod25decode(self.TEST_CIPHER, self.TEST_PAD)
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self.assertEqual(self.TEST_MSG, text)
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PADLINES = (1, 4, 7, 10, 13, 16, 19, 22, 25)
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TEXTLINES = (2, 5, 8, 11, 14, 17, 20, 23, 26)
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CIPHERLINES = (3, 6, 9, 12, 15, 18, 21, 24, 27)
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class TestOneTimePad(unittest.TestCase):
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TEST_PADLINE = 'HUCHUGGHOBUXADDHOHPGQBKXQKAOLRL'
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TEST_TEXTLINE = 'THISCAKEISUNSATISFACTORYTOMEYES'
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TEST_CIPHERLINE = 'BCMAXHRNXUPLTEXRGOQKKQBWKYNTKWD'
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def test_get_randint_on_nonexistent_randomness_file_fails_ioerror(self):
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OT._DEV_URANDOM['fp'] = None
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self.assertRaises(IOError, OT._get_randint,
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25, randomness_file='/foo/bar/busted/borken',
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fallback_to_fake=False)
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TEST_MSG = \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOODCHUCKCOULDCHUCKWOOD' \
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'HOWMUCHCHUCKCOULDAWOODCHUCKCHUCKIFAWOO'
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TEST_CIPHER = \
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'FMHZRGHRITAMHVAOLBANWMNYPBYDCFCAVXAEEKXUTYXLUCYQVYPWZFSKYI' \
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'LWKCHZSXLFCMZIEFHXKVUXVNBIQVSNYPTFVIZHSVTDCKWUSZHEHUPLZSUY' \
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'BTPSMEISGTYDWCXVUCPGHHKXDOUHGCVDTDUQVKFDRDCHFIKTNFGDFODCQS' \
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'RIWGZBLPTCSXLMPQODYLHQNGWNSCTHNDOZEUXWCEQAZMRGZIQUTUYSKOGW' \
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'YGYPEDNUZDWBEPUHLWWBHLGADYTCNGEUFKPLQSAMMXCTXWQEOYBNKQAHBV' \
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'PDKTMQSHDFCFBCVKXVTRSXRTBHAGKNLFASNVNENHHRNGCKXALMIBNZKOTL' \
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'BZMWGSNMTLDNPXKVQZZUAZCSPWFNRKAMTNMCPHWGLGBVSNFDXSKVUFBZBW' \
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'WICBUPCWZDUXCZTXHKQBMQNTBHAAGMBPKUIDTHITUEWEPPMACPXERXRYND' \
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'RWQSBQQMSQRVWZMAQQKUGHLELKFLKHGNFFDHIWUZPDIMIOELSIHMUIZQCW' \
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'KLPZQIFAXNDRRIIIHOYBGSCIYBIVSRTECEOZSBLYTNCXGQXEWMGIXHKBIL' \
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'TOKWHGABPMXNAHEWFKIMOQPHVHSYZABWLMLSSDEHQIBNEMEMHCWOUBIIZS' \
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'XPFWXMQNOTEANYGQBVMZAXNPAMWSUOGFAFFYUTKDZYHFTPYGOMDHESKOZI' \
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'IPDXAMSAQOTGAQKYPYWWUYGHSBVODAHDSKDVPMLWRCXQXGAXQZBFNKXFKU' \
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'WUDRWNRKECIQIUEEMQNCAZDDDOQOEGUVFVCTKLTISNOQILEKUYXCYZNHHZ' \
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'OFHCSLOPPQAFLHHDZANGTXNQSDZSAFLLSGWULVHIDERMTZZHTDHTZPHEFN' \
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'ORDEIYOVTTAWVTOOXSLZBOPMRCCKSMHQOVFERCOVUMWXFSNEMFALNWGRQC' \
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'NLWELLXNCHZGXQEUGEVNCWMHRNGUTBKTVEXGASBRCEBSFITOEFSNIBTLME' \
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'MERMOFVBNTFCTTWEGAIGRZQBBFOKOPXNCWXFBK'
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TEST_PAD = """\
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XXLNWDZOAYXBEGFCGADYHHKQUYOAULZQMRZHQVTRLDUARODERVGBWVVVKECHNQNWKUCLZBWU
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KUDWNGFTSEGFFSKSVEKZUMLTOSLIZZTFXODBZZMACDFUTESFRBAPYYVTTOCKQBSSTDGPILKE
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YHSTKXTTGVBAIIZXCUPHICYICDGOBOIUZUEYCMLHPNHXUEKCBWTMKYBKHZLNKTETDXIHYBHF
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WBOSEXMRLZVHNZSSQSBCKAERRITRBAZWGVZNTGDSIVIZEMBKWDOOBDWIDCZIUHVTKVTSGFDT
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NRGPNGRNKEVLZVYOAYTUWCDTOLGEQDBSHVRMMYYQIEZWKWZVCPGIAGKPNZEGTLPKMPEILQAC
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MIPKMYCFMVZKUTVKIPXBKGLFATSDCMYLPYLSTPBARVELNSOUFPZMUTRIRNZLYMDITNXMKLGE
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QXYRYEAOHGETEQMKTUMARPYMPKONUKYZIHTFGNHIKVOLTLRPMPNFSDHWQGVHBNDCWZCLUHQW
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GIFBFZKZOFZRRYCBOSBWSNVFXXPSAGOUOXDNBNSOZADYYSKWQUTYNCDNGVLSZNDBCTSIYOUX
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NNUGLZNKNDSYGRUCXTKLBIMXZMMZAEHVRFYMBFKVDPAEHOYCBXKADZOTRRMULOPAIKCIHKFY
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BQKKMEXUPLMTKGFIMPMTDVRZEBFEFARDEVQADVKIVNBHNZLEAAGLFIKXHTQWXBPNLXZHFUDZ
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XYLLVFETIDCYAXGTIHUFUSFMMWTLKZARVQOFGEBKIGWHFFFFKTHPQOMVAVILFLWMRLWPBWVW
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||||
PFKSLFFWKYQVPHVPQTTVFRLQXHFMGVXVHTNSVZQSETKHXAPPSLHAIAVXWGDFVKOBQLEWPAZY
|
||||
|
||||
|
||||
WELQRIFCGSOVFSLYXMSETCTROLNKMDWZSGKREFEPEHCOKSMRTNCDSTHCSQKMKCBYEWZSQHPK
|
||||
|
||||
|
||||
UNWWUBKICDYYOSIZWKWRLGGIMYWKMDXOUKYHCUYCACKSFRWWXADQUZTCNYEYCSQEBTCZMSCV
|
||||
|
||||
|
||||
NTGCDGFUUCTQWINV........................................................
|
||||
|
||||
"""
|
||||
def test_get_randint_on_nonexistent_randomness_file_uses_fake(self):
|
||||
OT._DEV_URANDOM['fp'] = None
|
||||
random_int = OT._get_randint(32, randomness_file='/broke/as/joke')
|
||||
self.assertTrue(random_int in range(0, 255))
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
|
||||
331
onetimepad.py
331
onetimepad.py
@ -1,62 +1,177 @@
|
||||
from itertools import izip
|
||||
|
||||
PAD_MODULO = 3
|
||||
PADLINE_OFFSET = -2
|
||||
TEXTLINE_OFFSET = -1
|
||||
DEFAULT_PAD_WIDTH = 72
|
||||
CIPHER_FLOOR = 1
|
||||
CIPHER_CEIL = 25
|
||||
NULLCHAR = '.'
|
||||
|
||||
|
||||
def encode(msg, pad):
|
||||
ret = []
|
||||
filled = list(_text_padfill(msg, pad))
|
||||
for i, line in enumerate(_text_cipherfill(filled)):
|
||||
lineno = i + 1
|
||||
if _is_cipherline(lineno):
|
||||
ret.append(line)
|
||||
return ''.join(ret).strip(NULLCHAR)
|
||||
def mod25encode(msg, pad):
|
||||
mod25 = Mod25(pad=pad)
|
||||
return mod25.encode(msg)
|
||||
|
||||
|
||||
def decode(ciphertext, pad):
|
||||
ret = []
|
||||
filled = list(_cipher_padfill(ciphertext, pad))
|
||||
for i, line in enumerate(_cipher_textfill(filled)):
|
||||
lineno = i + 1
|
||||
if _is_textline(lineno):
|
||||
ret.append(line)
|
||||
return ''.join(ret).strip(NULLCHAR)
|
||||
def mod25decode(msg, pad):
|
||||
mod25 = Mod25(pad=pad)
|
||||
return mod25.decode(msg)
|
||||
|
||||
|
||||
def create_pad(length, width=DEFAULT_PAD_WIDTH):
|
||||
return '\n'.join(create_pad_lines(length, width=width))
|
||||
class Mod25(object):
|
||||
_pad_modulo = 3
|
||||
_padline_offset = -2
|
||||
_textline_offset = -1
|
||||
_cipher_floor = 1
|
||||
_cipher_ceil = 25
|
||||
_nullchar = '.'
|
||||
|
||||
def __init__(self, pad=''):
|
||||
self.pad = pad
|
||||
self._as_alpha = {}
|
||||
self._as_nums = {}
|
||||
self._mk_as_alpha_as_nums()
|
||||
|
||||
def _mk_as_alpha_as_nums(self):
|
||||
as_alpha = {}
|
||||
as_nums = {}
|
||||
a_chr = ord('A')
|
||||
past_j = False
|
||||
|
||||
for char in range(self._cipher_ceil + 1):
|
||||
letter = chr(a_chr + char)
|
||||
if letter != 'J':
|
||||
key = char + (1 if not past_j else 0)
|
||||
as_alpha[key] = letter
|
||||
else:
|
||||
past_j = True
|
||||
|
||||
for key, val in as_alpha.iteritems():
|
||||
as_nums[val] = key
|
||||
|
||||
self._as_alpha.update(as_alpha)
|
||||
self._as_nums.update(as_nums)
|
||||
|
||||
def encode(self, msg):
|
||||
ret = []
|
||||
filled = list(self._text_padfill(msg))
|
||||
for i, line in enumerate(self._text_cipherfill(filled)):
|
||||
lineno = i + 1
|
||||
if self._is_cipherline(lineno):
|
||||
ret.append(line)
|
||||
return ''.join(ret).strip(self._nullchar)
|
||||
|
||||
def decode(self, ciphertext):
|
||||
ret = []
|
||||
filled = list(self._cipher_padfill(ciphertext))
|
||||
for i, line in enumerate(self._cipher_textfill(filled)):
|
||||
lineno = i + 1
|
||||
if self._is_textline(lineno):
|
||||
ret.append(line)
|
||||
return ''.join(ret).strip(self._nullchar)
|
||||
|
||||
def create_pad(self, length, width=DEFAULT_PAD_WIDTH):
|
||||
return '\n'.join(self.create_pad_lines(length, width=width))
|
||||
|
||||
def create_pad_lines(self, length, width=DEFAULT_PAD_WIDTH):
|
||||
chars = self._create_chars_for_pad(length)
|
||||
lines = _chunk_chars_into_lines(chars, self._nullchar, width=width)
|
||||
for line in lines:
|
||||
yield line
|
||||
yield ''
|
||||
yield ''
|
||||
|
||||
def _create_chars_for_pad(self, length):
|
||||
chars = []
|
||||
for char in range(length):
|
||||
chars.append(self._as_alpha[_get_randint(self._cipher_ceil)])
|
||||
return ''.join(chars)
|
||||
|
||||
def _ensure_pad_is_lines(self):
|
||||
if isinstance(self.pad, basestring):
|
||||
self.pad = self.pad.splitlines()
|
||||
|
||||
def _text_padfill(self, text):
|
||||
self._ensure_pad_is_lines()
|
||||
padlines = [line.strip() for line in self.pad if line.strip()]
|
||||
textlines = _chunk_chars_into_lines(text, self._nullchar,
|
||||
_get_textwidth(padlines))
|
||||
for textline, padline in izip(textlines, padlines):
|
||||
yield padline
|
||||
yield textline
|
||||
yield ''
|
||||
|
||||
def _cipher_padfill(self, ciphertext):
|
||||
self._ensure_pad_is_lines()
|
||||
padlines = [line.strip() for line in self.pad if line.strip()]
|
||||
cipherlines = _chunk_chars_into_lines(ciphertext, self._nullchar,
|
||||
_get_textwidth(padlines))
|
||||
for cipherline, padline in izip(cipherlines, padlines):
|
||||
yield padline
|
||||
yield ''
|
||||
yield cipherline
|
||||
|
||||
def _text_cipherfill(self, padfilled_text_lines):
|
||||
for i, line in enumerate(padfilled_text_lines):
|
||||
lineno = i + 1
|
||||
if self._is_cipherline(lineno):
|
||||
padline = padfilled_text_lines[i - abs(self._padline_offset)]
|
||||
textline = padfilled_text_lines[i - abs(self._textline_offset)]
|
||||
yield padline
|
||||
yield textline
|
||||
yield self._cipherline_from_padline_and_textline(padline,
|
||||
textline)
|
||||
|
||||
def _cipher_textfill(self, padfilled_cipher_lines):
|
||||
for i, line in enumerate(padfilled_cipher_lines):
|
||||
lineno = i + 1
|
||||
if self._is_cipherline(lineno):
|
||||
padline = padfilled_cipher_lines[i - abs(self._padline_offset)]
|
||||
textline = \
|
||||
padfilled_cipher_lines[i - abs(self._textline_offset)]
|
||||
yield padline
|
||||
yield self._textline_from_cipherline_and_padline(line, padline)
|
||||
yield line
|
||||
|
||||
def _cipherline_from_padline_and_textline(self, padline, textline):
|
||||
ret = []
|
||||
for padchar, textchar in izip(padline, textline):
|
||||
if textchar == self._nullchar:
|
||||
ret.append(self._nullchar)
|
||||
continue
|
||||
charnum = self._as_nums[padchar] + self._as_nums[textchar]
|
||||
idx = charnum if charnum <= self._cipher_ceil else \
|
||||
charnum % self._cipher_ceil
|
||||
ret.append(self._as_alpha[idx])
|
||||
return ''.join(ret)
|
||||
|
||||
def _textline_from_cipherline_and_padline(self, cipherline, padline):
|
||||
ret = []
|
||||
for ciphercar, padchar in izip(cipherline, padline):
|
||||
if ciphercar == self._nullchar:
|
||||
ret.append(self._nullchar)
|
||||
continue
|
||||
charnum = self._as_nums[ciphercar] - self._as_nums[padchar]
|
||||
idx = charnum if charnum <= self._cipher_ceil else \
|
||||
charnum % self._cipher_ceil
|
||||
if idx < 0:
|
||||
idx = self._cipher_ceil + idx
|
||||
ret.append(self._as_alpha[idx])
|
||||
return ''.join(ret)
|
||||
|
||||
def _is_padline(self, lineno):
|
||||
return self._is_cipherline(lineno + abs(self._padline_offset))
|
||||
|
||||
def _is_textline(self, lineno):
|
||||
return self._is_cipherline(lineno + abs(self._textline_offset))
|
||||
|
||||
def _is_cipherline(self, lineno):
|
||||
return not lineno % self._pad_modulo
|
||||
|
||||
|
||||
def create_pad_lines(length, width=DEFAULT_PAD_WIDTH):
|
||||
chars = _create_chars_for_pad(length)
|
||||
lines = _chunk_chars_into_lines(chars, width=width)
|
||||
for line in lines:
|
||||
yield line
|
||||
yield ''
|
||||
yield ''
|
||||
|
||||
|
||||
def _create_chars_for_pad(length):
|
||||
chars = []
|
||||
for char in range(length):
|
||||
chars.append(_AS_ALPHA[_get_randint()])
|
||||
return ''.join(chars)
|
||||
|
||||
|
||||
def _chunk_chars_into_lines(chars, width=DEFAULT_PAD_WIDTH):
|
||||
def _chunk_chars_into_lines(chars, nullchar, width=DEFAULT_PAD_WIDTH):
|
||||
lines = []
|
||||
for chunk in _as_line_chunks(chars, width=width):
|
||||
for chunk in _as_line_chunks(chars, nullchar, width=width):
|
||||
lines.append(chunk)
|
||||
return lines
|
||||
|
||||
|
||||
def _as_line_chunks(chars, width=DEFAULT_PAD_WIDTH):
|
||||
def _as_line_chunks(chars, nullchar, width=DEFAULT_PAD_WIDTH):
|
||||
chunk = []
|
||||
for char in chars.replace('\n', ''):
|
||||
chunk.append(char)
|
||||
@ -64,142 +179,42 @@ def _as_line_chunks(chars, width=DEFAULT_PAD_WIDTH):
|
||||
yield ''.join(chunk)
|
||||
chunk = []
|
||||
if len(chunk) < width:
|
||||
chunk += ([NULLCHAR] * (width - len(chunk)))
|
||||
chunk += ([nullchar] * (width - len(chunk)))
|
||||
yield ''.join(chunk)
|
||||
|
||||
|
||||
def _text_padfill(text, padlines):
|
||||
if isinstance(padlines, basestring):
|
||||
padlines = padlines.splitlines()
|
||||
padlines = [line.strip() for line in padlines if line.strip()]
|
||||
textlines = _chunk_chars_into_lines(text, _get_textwidth(padlines))
|
||||
for textline, padline in izip(textlines, padlines):
|
||||
yield padline
|
||||
yield textline
|
||||
yield ''
|
||||
|
||||
|
||||
def _cipher_padfill(ciphertext, padlines):
|
||||
if isinstance(padlines, basestring):
|
||||
padlines = padlines.splitlines()
|
||||
padlines = [line.strip() for line in padlines if line.strip()]
|
||||
cipherlines = _chunk_chars_into_lines(ciphertext, _get_textwidth(padlines))
|
||||
for cipherline, padline in izip(cipherlines, padlines):
|
||||
yield padline
|
||||
yield ''
|
||||
yield cipherline
|
||||
|
||||
|
||||
def _text_cipherfill(padfilled_text_lines):
|
||||
for i, line in enumerate(padfilled_text_lines):
|
||||
lineno = i + 1
|
||||
if _is_cipherline(lineno):
|
||||
padline = padfilled_text_lines[i - abs(PADLINE_OFFSET)]
|
||||
textline = padfilled_text_lines[i - abs(TEXTLINE_OFFSET)]
|
||||
yield padline
|
||||
yield textline
|
||||
yield _cipherline_from_padline_and_textline(padline, textline)
|
||||
|
||||
|
||||
def _cipher_textfill(padfilled_cipher_lines):
|
||||
for i, line in enumerate(padfilled_cipher_lines):
|
||||
lineno = i + 1
|
||||
if _is_cipherline(lineno):
|
||||
padline = padfilled_cipher_lines[i - abs(PADLINE_OFFSET)]
|
||||
textline = padfilled_cipher_lines[i - abs(TEXTLINE_OFFSET)]
|
||||
yield padline
|
||||
yield _textline_from_cipherline_and_padline(line, padline)
|
||||
yield line
|
||||
|
||||
|
||||
def _cipherline_from_padline_and_textline(padline, textline):
|
||||
ret = []
|
||||
for padchar, textchar in izip(padline, textline):
|
||||
if textchar == NULLCHAR:
|
||||
ret.append(NULLCHAR)
|
||||
continue
|
||||
charnum = _AS_NUMS[padchar] + _AS_NUMS[textchar]
|
||||
idx = charnum if charnum <= CIPHER_CEIL else charnum % CIPHER_CEIL
|
||||
ret.append(_AS_ALPHA[idx])
|
||||
return ''.join(ret)
|
||||
|
||||
|
||||
def _textline_from_cipherline_and_padline(cipherline, padline):
|
||||
ret = []
|
||||
for ciphercar, padchar in izip(cipherline, padline):
|
||||
if ciphercar == NULLCHAR:
|
||||
ret.append(NULLCHAR)
|
||||
continue
|
||||
charnum = _AS_NUMS[ciphercar] - _AS_NUMS[padchar]
|
||||
idx = charnum if charnum <= CIPHER_CEIL else charnum % CIPHER_CEIL
|
||||
if idx < 0:
|
||||
idx = CIPHER_CEIL + idx
|
||||
ret.append(_AS_ALPHA[idx])
|
||||
return ''.join(ret)
|
||||
|
||||
|
||||
def _get_textwidth(textlines):
|
||||
return max([len(line) for line in textlines])
|
||||
|
||||
|
||||
def _is_padline(lineno):
|
||||
return _is_cipherline(lineno + abs(PADLINE_OFFSET))
|
||||
|
||||
|
||||
def _is_textline(lineno):
|
||||
return _is_cipherline(lineno + abs(TEXTLINE_OFFSET))
|
||||
|
||||
|
||||
def _is_cipherline(lineno):
|
||||
return not lineno % PAD_MODULO
|
||||
|
||||
|
||||
def _get_randint(randomness_file='/dev/urandom', fallback_to_fake=True):
|
||||
if not _DEV_RANDOM.get('fp'):
|
||||
def _get_randint(modulo, randomness_file='/dev/urandom',
|
||||
fallback_to_fake=True):
|
||||
if not _DEV_URANDOM.get('fp'):
|
||||
_get_urandom_fp(randomness_file=randomness_file,
|
||||
fallback_to_fake=fallback_to_fake)
|
||||
ret = ord(_DEV_RANDOM['fp'].read(1)) % CIPHER_CEIL
|
||||
return ret if ret != 0 else _get_randint()
|
||||
ret = ord(_DEV_URANDOM['fp'].read(1)) % modulo
|
||||
return ret if ret != 0 else _get_randint(modulo)
|
||||
|
||||
|
||||
class _FakeDevUrandom(object):
|
||||
|
||||
def read(self, nchars):
|
||||
@staticmethod
|
||||
def read(nchars):
|
||||
import random
|
||||
return ''.join([chr(random.randint(0, 255)) for i in range(0, nchars)])
|
||||
ret = []
|
||||
for i in range(0, nchars):
|
||||
ret.append(chr(random.randint(0, 255)))
|
||||
return ''.join(ret)
|
||||
|
||||
|
||||
def _get_urandom_fp(randomness_file='/dev/urandom', fallback_to_fake=True):
|
||||
try:
|
||||
_DEV_RANDOM['fp'] = open(randomness_file)
|
||||
_DEV_URANDOM['fp'] = open(randomness_file)
|
||||
except (OSError, IOError):
|
||||
if fallback_to_fake:
|
||||
_DEV_RANDOM['fp'] = _FakeDevUrandom()
|
||||
_DEV_URANDOM['fp'] = _FakeDevUrandom()
|
||||
else:
|
||||
raise
|
||||
|
||||
|
||||
_DEV_RANDOM = {}
|
||||
|
||||
|
||||
def _mk_as_alpha_as_nums():
|
||||
as_alpha = {}
|
||||
as_nums = {}
|
||||
a_chr = ord('A')
|
||||
past_j = False
|
||||
|
||||
for char in range(CIPHER_CEIL + 1):
|
||||
letter = chr(a_chr + char)
|
||||
if letter != 'J':
|
||||
key = char + (1 if not past_j else 0)
|
||||
as_alpha[key] = letter
|
||||
else:
|
||||
past_j = True
|
||||
|
||||
for key, val in as_alpha.iteritems():
|
||||
as_nums[val] = key
|
||||
|
||||
return as_alpha, as_nums
|
||||
|
||||
|
||||
_AS_ALPHA, _AS_NUMS = _mk_as_alpha_as_nums()
|
||||
_DEV_URANDOM = {}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user