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1 | ### -*- mode: python, coding: utf-8 -*- |
2 | ### | |
3 | ### Test symmetric algorithms | |
4 | ### | |
5 | ### (c) 2019 Straylight/Edgeware | |
6 | ### | |
7 | ||
8 | ###----- Licensing notice --------------------------------------------------- | |
9 | ### | |
10 | ### This file is part of the Python interface to Catacomb. | |
11 | ### | |
12 | ### Catacomb/Python is free software: you can redistribute it and/or | |
13 | ### modify it under the terms of the GNU General Public License as | |
14 | ### published by the Free Software Foundation; either version 2 of the | |
15 | ### License, or (at your option) any later version. | |
16 | ### | |
17 | ### Catacomb/Python is distributed in the hope that it will be useful, but | |
18 | ### WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | ### General Public License for more details. | |
21 | ### | |
22 | ### You should have received a copy of the GNU General Public License | |
23 | ### along with Catacomb/Python. If not, write to the Free Software | |
24 | ### Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
25 | ### USA. | |
26 | ||
27 | ###-------------------------------------------------------------------------- | |
28 | ### Imported modules. | |
29 | ||
30 | import catacomb as C | |
31 | import unittest as U | |
32 | import testutils as T | |
33 | ||
34 | ###-------------------------------------------------------------------------- | |
35 | ### Utilities. | |
36 | ||
37 | def bad_key_size(ksz): | |
38 | if isinstance(ksz, C.KeySZAny): return None | |
39 | elif isinstance(ksz, C.KeySZRange): | |
40 | if ksz.mod != 1: return ksz.min + 1 | |
a9410db7 | 41 | elif ksz.max is not None: return ksz.max + 1 |
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42 | elif ksz.min != 0: return ksz.min - 1 |
43 | else: return None | |
44 | elif isinstance(ksz, C.KeySZSet): | |
45 | for sz in sorted(ksz.set): | |
46 | if sz + 1 not in ksz.set: return sz + 1 | |
47 | assert False, "That should have worked." | |
48 | else: | |
49 | return None | |
50 | ||
51 | def different_key_size(ksz, sz): | |
52 | if isinstance(ksz, C.KeySZAny): return sz + 1 | |
53 | elif isinstance(ksz, C.KeySZRange): | |
54 | if sz > ksz.min: return sz - ksz.mod | |
a9410db7 | 55 | elif ksz.max is None or sz < ksz.max: return sz + ksz.mod |
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56 | else: return None |
57 | elif isinstance(ksz, C.KeySZSet): | |
58 | for sz1 in sorted(ksz.set): | |
59 | if sz != sz1: return sz1 | |
60 | return None | |
61 | else: | |
62 | return None | |
63 | ||
64 | class HashBufferTestMixin (U.TestCase): | |
65 | """Mixin class for testing all of the various `hash...' methods.""" | |
66 | ||
67 | def check_hashbuffer_hashn(me, w, bigendp, makefn, hashfn): | |
68 | """Check `hashuN'.""" | |
69 | ||
70 | ## Check encoding an integer. | |
71 | h0, donefn0 = makefn(w + 2) | |
72 | hashfn(h0.hashu8(0x00), T.bytes_as_int(w, bigendp)).hashu8(w + 1) | |
73 | h1, donefn1 = makefn(w + 2) | |
74 | h1.hash(T.span(w + 2)) | |
75 | me.assertEqual(donefn0(), donefn1()) | |
76 | ||
77 | ## Check overflow detection. | |
78 | h0, _ = makefn(w) | |
694bf907 | 79 | me.assertRaises(OverflowError, hashfn, h0, 1 << 8*w) |
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80 | |
81 | def check_hashbuffer_bufn(me, w, bigendp, makefn, hashfn): | |
82 | """Check `hashbufN'.""" | |
83 | ||
84 | ## Go through a number of different sizes. | |
85 | for n in [0, 1, 7, 8, 19, 255, 12345, 65535, 123456]: | |
86 | if n >= 1 << 8*w: continue | |
87 | h0, donefn0 = makefn(2 + w + n) | |
88 | hashfn(h0.hashu8(0x00), T.span(n)).hashu8(0xff) | |
89 | h1, donefn1 = makefn(2 + w + n) | |
90 | h1.hash(T.prep_lenseq(w, n, bigendp, True)) | |
91 | me.assertEqual(donefn0(), donefn1()) | |
92 | ||
93 | ## Check blocks which are too large for the length prefix. | |
94 | if w <= 3: | |
95 | n = 1 << 8*w | |
96 | h0, _ = makefn(w + n) | |
e01ab3c9 | 97 | me.assertRaises(ValueError, hashfn, h0, C.ByteString.zero(n)) |
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98 | |
99 | def check_hashbuffer(me, makefn): | |
100 | """Test the various `hash...' methods.""" | |
101 | ||
102 | ## Check `hashuN'. | |
103 | me.check_hashbuffer_hashn(1, True, makefn, lambda h, n: h.hashu8(n)) | |
104 | me.check_hashbuffer_hashn(2, True, makefn, lambda h, n: h.hashu16(n)) | |
105 | me.check_hashbuffer_hashn(2, True, makefn, lambda h, n: h.hashu16b(n)) | |
106 | me.check_hashbuffer_hashn(2, False, makefn, lambda h, n: h.hashu16l(n)) | |
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107 | me.check_hashbuffer_hashn(3, True, makefn, lambda h, n: h.hashu24(n)) |
108 | me.check_hashbuffer_hashn(3, True, makefn, lambda h, n: h.hashu24b(n)) | |
109 | me.check_hashbuffer_hashn(3, False, makefn, lambda h, n: h.hashu24l(n)) | |
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110 | me.check_hashbuffer_hashn(4, True, makefn, lambda h, n: h.hashu32(n)) |
111 | me.check_hashbuffer_hashn(4, True, makefn, lambda h, n: h.hashu32b(n)) | |
112 | me.check_hashbuffer_hashn(4, False, makefn, lambda h, n: h.hashu32l(n)) | |
113 | if hasattr(makefn(0)[0], "hashu64"): | |
114 | me.check_hashbuffer_hashn(8, True, makefn, lambda h, n: h.hashu64(n)) | |
115 | me.check_hashbuffer_hashn(8, True, makefn, lambda h, n: h.hashu64b(n)) | |
116 | me.check_hashbuffer_hashn(8, False, makefn, lambda h, n: h.hashu64l(n)) | |
117 | ||
118 | ## Check `hashbufN'. | |
119 | me.check_hashbuffer_bufn(1, True, makefn, lambda h, x: h.hashbuf8(x)) | |
120 | me.check_hashbuffer_bufn(2, True, makefn, lambda h, x: h.hashbuf16(x)) | |
121 | me.check_hashbuffer_bufn(2, True, makefn, lambda h, x: h.hashbuf16b(x)) | |
122 | me.check_hashbuffer_bufn(2, False, makefn, lambda h, x: h.hashbuf16l(x)) | |
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123 | me.check_hashbuffer_bufn(3, True, makefn, lambda h, x: h.hashbuf24(x)) |
124 | me.check_hashbuffer_bufn(3, True, makefn, lambda h, x: h.hashbuf24b(x)) | |
125 | me.check_hashbuffer_bufn(3, False, makefn, lambda h, x: h.hashbuf24l(x)) | |
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126 | me.check_hashbuffer_bufn(4, True, makefn, lambda h, x: h.hashbuf32(x)) |
127 | me.check_hashbuffer_bufn(4, True, makefn, lambda h, x: h.hashbuf32b(x)) | |
128 | me.check_hashbuffer_bufn(4, False, makefn, lambda h, x: h.hashbuf32l(x)) | |
129 | if hasattr(makefn(0)[0], "hashbuf64"): | |
130 | me.check_hashbuffer_bufn(8, True, makefn, lambda h, x: h.hashbuf64(x)) | |
131 | me.check_hashbuffer_bufn(8, True, makefn, lambda h, x: h.hashbuf64b(x)) | |
132 | me.check_hashbuffer_bufn(8, False, makefn, lambda h, x: h.hashbuf64l(x)) | |
133 | ||
134 | ###-------------------------------------------------------------------------- | |
135 | class TestKeysize (U.TestCase): | |
136 | ||
137 | def test_any(me): | |
138 | ||
139 | ## A typical one-byte spec. | |
140 | ksz = C.seal.keysz | |
141 | me.assertEqual(type(ksz), C.KeySZAny) | |
142 | me.assertEqual(ksz.default, 20) | |
143 | me.assertEqual(ksz.min, 0) | |
a9410db7 | 144 | me.assertEqual(ksz.max, None) |
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145 | for n in [0, 12, 20, 5000]: |
146 | me.assertTrue(ksz.check(n)) | |
147 | me.assertEqual(ksz.best(n), n) | |
606677f6 | 148 | me.assertEqual(ksz.pad(n), n) |
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149 | |
150 | ## A typical two-byte spec. (No published algorithms actually /need/ a | |
151 | ## two-byte key-size spec, but all of the HMAC variants use one anyway.) | |
152 | ksz = C.sha256_hmac.keysz | |
153 | me.assertEqual(type(ksz), C.KeySZAny) | |
154 | me.assertEqual(ksz.default, 32) | |
155 | me.assertEqual(ksz.min, 0) | |
a9410db7 | 156 | me.assertEqual(ksz.max, None) |
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157 | for n in [0, 12, 20, 5000]: |
158 | me.assertTrue(ksz.check(n)) | |
159 | me.assertEqual(ksz.best(n), n) | |
606677f6 | 160 | me.assertEqual(ksz.pad(n), n) |
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161 | |
162 | ## Check construction. | |
163 | ksz = C.KeySZAny(15) | |
164 | me.assertEqual(ksz.default, 15) | |
165 | me.assertEqual(ksz.min, 0) | |
a9410db7 | 166 | me.assertEqual(ksz.max, None) |
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167 | me.assertRaises(ValueError, lambda: C.KeySZAny(-8)) |
168 | me.assertEqual(C.KeySZAny(0).default, 0) | |
169 | ||
170 | def test_set(me): | |
171 | ## Note that no published algorithm uses a 16-bit `set' spec. | |
172 | ||
173 | ## A typical spec. | |
174 | ksz = C.salsa20.keysz | |
175 | me.assertEqual(type(ksz), C.KeySZSet) | |
176 | me.assertEqual(ksz.default, 32) | |
177 | me.assertEqual(ksz.min, 10) | |
178 | me.assertEqual(ksz.max, 32) | |
fd46a88d | 179 | me.assertEqual(ksz.set, set([10, 16, 32])) |
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180 | for x, best, pad in [(9, None, 10), (10, 10, 10), (11, 10, 16), |
181 | (15, 10, 16), (16, 16, 16), (17, 16, 32), | |
182 | (31, 16, 32), (32, 32, 32), (33, 32, None)]: | |
183 | if x == best == pad: me.assertTrue(ksz.check(x)) | |
184 | else: me.assertFalse(ksz.check(x)) | |
185 | if best is None: me.assertRaises(ValueError, ksz.best, x) | |
186 | else: me.assertEqual(ksz.best(x), best) | |
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187 | if pad is None: me.assertRaises(ValueError, ksz.pad, x) |
188 | else: me.assertEqual(ksz.pad(x), pad) | |
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189 | |
190 | ## Check construction. | |
191 | ksz = C.KeySZSet(7) | |
192 | me.assertEqual(ksz.default, 7) | |
fd46a88d | 193 | me.assertEqual(ksz.set, set([7])) |
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194 | me.assertEqual(ksz.min, 7) |
195 | me.assertEqual(ksz.max, 7) | |
fd46a88d | 196 | ksz = C.KeySZSet(7, iter([3, 6, 9])) |
553d59fe | 197 | me.assertEqual(ksz.default, 7) |
fd46a88d | 198 | me.assertEqual(ksz.set, set([3, 6, 7, 9])) |
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199 | me.assertEqual(ksz.min, 3) |
200 | me.assertEqual(ksz.max, 9) | |
201 | ||
202 | def test_range(me): | |
203 | ## Note that no published algorithm uses a 16-bit `range' spec, or an | |
204 | ## unbounded `range'. | |
205 | ||
206 | ## A typical spec. | |
207 | ksz = C.rijndael.keysz | |
208 | me.assertEqual(type(ksz), C.KeySZRange) | |
209 | me.assertEqual(ksz.default, 32) | |
210 | me.assertEqual(ksz.min, 4) | |
211 | me.assertEqual(ksz.max, 32) | |
212 | me.assertEqual(ksz.mod, 4) | |
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213 | for x, best, pad in [(3, None, 4), (4, 4, 4), (5, 4, 8), |
214 | (15, 12, 16), (16, 16, 16), (17, 16, 20), | |
215 | (31, 28, 32), (32, 32, 32), (33, 32, None)]: | |
216 | if x == best == pad: me.assertTrue(ksz.check(x)) | |
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217 | else: me.assertFalse(ksz.check(x)) |
218 | if best is None: me.assertRaises(ValueError, ksz.best, x) | |
219 | else: me.assertEqual(ksz.best(x), best) | |
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220 | if pad is None: me.assertRaises(ValueError, ksz.pad, x) |
221 | else: me.assertEqual(ksz.pad(x), pad) | |
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222 | |
223 | ## Check construction. | |
224 | ksz = C.KeySZRange(28, 21, 35, 7) | |
225 | me.assertEqual(ksz.default, 28) | |
226 | me.assertEqual(ksz.min, 21) | |
227 | me.assertEqual(ksz.max, 35) | |
228 | me.assertEqual(ksz.mod, 7) | |
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229 | ksz = C.KeySZRange(28, 21, None, 7) |
230 | me.assertEqual(ksz.min, 21) | |
231 | me.assertEqual(ksz.max, None) | |
232 | me.assertEqual(ksz.mod, 7) | |
233 | me.assertEqual(ksz.pad(36), 42) | |
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234 | me.assertRaises(ValueError, C.KeySZRange, 29, 21, 35, 7) |
235 | me.assertRaises(ValueError, C.KeySZRange, 28, 20, 35, 7) | |
236 | me.assertRaises(ValueError, C.KeySZRange, 28, 21, 34, 7) | |
237 | me.assertRaises(ValueError, C.KeySZRange, 28, -7, 35, 7) | |
238 | me.assertRaises(ValueError, C.KeySZRange, 28, 35, 21, 7) | |
239 | me.assertRaises(ValueError, C.KeySZRange, 35, 21, 28, 7) | |
240 | me.assertRaises(ValueError, C.KeySZRange, 21, 28, 35, 7) | |
241 | ||
242 | def test_conversions(me): | |
243 | me.assertEqual(C.KeySZ.fromec(256), 128) | |
244 | me.assertEqual(C.KeySZ.fromschnorr(256), 128) | |
245 | me.assertEqual(round(C.KeySZ.fromdl(2958.6875)), 128) | |
246 | me.assertEqual(round(C.KeySZ.fromif(2958.6875)), 128) | |
247 | me.assertEqual(C.KeySZ.toec(128), 256) | |
248 | me.assertEqual(C.KeySZ.toschnorr(128), 256) | |
249 | me.assertEqual(C.KeySZ.todl(128), 2958.6875) | |
250 | me.assertEqual(C.KeySZ.toif(128), 2958.6875) | |
251 | ||
252 | ###-------------------------------------------------------------------------- | |
253 | class TestCipher (T.GenericTestMixin): | |
254 | """Test basic symmetric ciphers.""" | |
255 | ||
256 | def _test_cipher(me, ccls): | |
257 | ||
258 | ## Check the class properties. | |
259 | me.assertEqual(type(ccls.name), str) | |
260 | me.assertTrue(isinstance(ccls.keysz, C.KeySZ)) | |
261 | me.assertEqual(type(ccls.blksz), int) | |
262 | ||
263 | ## Check round-tripping. | |
264 | k = T.span(ccls.keysz.default) | |
265 | iv = T.span(ccls.blksz) | |
266 | m = T.span(253) | |
267 | enc = ccls(k) | |
268 | dec = ccls(k) | |
269 | try: enc.setiv(iv) | |
270 | except ValueError: can_setiv = False | |
271 | else: | |
272 | can_setiv = True | |
273 | dec.setiv(iv) | |
274 | c0 = enc.encrypt(m[0:57]) | |
275 | m0 = dec.decrypt(c0) | |
276 | c1 = enc.encrypt(m[57:189]) | |
277 | m1 = dec.decrypt(c1) | |
278 | try: enc.bdry() | |
279 | except ValueError: can_bdry = False | |
280 | else: | |
281 | dec.bdry() | |
282 | can_bdry = True | |
283 | c2 = enc.encrypt(m[189:253]) | |
284 | m2 = dec.decrypt(c2) | |
285 | me.assertEqual(len(c0) + len(c1) + len(c2), len(m)) | |
286 | me.assertEqual(m0, m[0:57]) | |
287 | me.assertEqual(m1, m[57:189]) | |
288 | me.assertEqual(m2, m[189:253]) | |
289 | ||
290 | ## Check the `enczero' and `deczero' methods. | |
291 | c3 = enc.enczero(32) | |
292 | me.assertEqual(dec.decrypt(c3), C.ByteString.zero(32)) | |
293 | m4 = dec.deczero(32) | |
294 | me.assertEqual(enc.encrypt(m4), C.ByteString.zero(32)) | |
295 | ||
296 | ## Check that ciphers which support a `boundary' operation actually | |
297 | ## need it. | |
298 | if can_bdry: | |
299 | dec = ccls(k) | |
300 | if can_setiv: dec.setiv(iv) | |
301 | m01 = dec.decrypt(c0 + c1) | |
302 | me.assertEqual(m01, m[0:189]) | |
303 | ||
304 | ## Check that the boundary actually does something. | |
305 | if can_bdry: | |
306 | dec = ccls(k) | |
307 | if can_setiv: dec.setiv(iv) | |
308 | m012 = dec.decrypt(c0 + c1 + c2) | |
309 | me.assertNotEqual(m012, m) | |
310 | ||
311 | ## Check that bad key lengths are rejected. | |
312 | badlen = bad_key_size(ccls.keysz) | |
313 | if badlen is not None: me.assertRaises(ValueError, ccls, T.span(badlen)) | |
314 | ||
315 | TestCipher.generate_testcases((name, C.gcciphers[name]) for name in | |
316 | ["des-ecb", "rijndael-cbc", "twofish-cfb", "serpent-ofb", | |
317 | "blowfish-counter", "rc4", "seal", "salsa20/8", "shake128-xof"]) | |
318 | ||
319 | ###-------------------------------------------------------------------------- | |
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320 | class TestAuthenticatedEncryption \ |
321 | (HashBufferTestMixin, T.GenericTestMixin): | |
322 | """Test authenticated encryption schemes.""" | |
323 | ||
324 | def _test_aead(me, aecls): | |
325 | ||
326 | ## Check the class properties. | |
327 | me.assertEqual(type(aecls.name), str) | |
328 | me.assertTrue(isinstance(aecls.keysz, C.KeySZ)) | |
329 | me.assertTrue(isinstance(aecls.noncesz, C.KeySZ)) | |
330 | me.assertTrue(isinstance(aecls.tagsz, C.KeySZ)) | |
331 | me.assertEqual(type(aecls.blksz), int) | |
332 | me.assertEqual(type(aecls.bufsz), int) | |
333 | me.assertEqual(type(aecls.ohd), int) | |
334 | me.assertEqual(type(aecls.flags), int) | |
335 | ||
336 | ## Check round-tripping, with full precommitment. First, select some | |
337 | ## parameters. (It's conceivable that some AEAD schemes are more | |
338 | ## restrictive than advertised by the various properties, but this works | |
339 | ## out OK in practice.) | |
340 | k = T.span(aecls.keysz.default) | |
341 | n = T.span(aecls.noncesz.default) | |
342 | if aecls.flags&C.AEADF_NOAAD: h = T.span(0) | |
343 | else: h = T.span(131) | |
344 | m = T.span(253) | |
345 | tsz = aecls.tagsz.default | |
346 | key = aecls(k) | |
347 | ||
348 | ## Next, encrypt a message, checking that things are proper as we go. | |
349 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
350 | me.assertEqual(enc.hsz, len(h)) | |
351 | me.assertEqual(enc.msz, len(m)) | |
352 | me.assertEqual(enc.mlen, 0) | |
353 | me.assertEqual(enc.tsz, tsz) | |
354 | aad = enc.aad() | |
355 | if aecls.flags&C.AEADF_AADNDEP: me.assertEqual(aad.hsz, len(h)) | |
356 | else: me.assertEqual(aad.hsz, None) | |
357 | me.assertEqual(aad.hlen, 0) | |
358 | if not aecls.flags&C.AEADF_NOAAD: | |
359 | aad.hash(h[0:83]) | |
360 | me.assertEqual(aad.hlen, 83) | |
361 | aad.hash(h[83:131]) | |
362 | me.assertEqual(aad.hlen, 131) | |
363 | c0 = enc.encrypt(m[0:57]) | |
364 | me.assertEqual(enc.mlen, 57) | |
365 | me.assertTrue(57 - aecls.bufsz <= len(c0) <= 57 + aecls.ohd) | |
366 | c1 = enc.encrypt(m[57:189]) | |
367 | me.assertEqual(enc.mlen, 189) | |
368 | me.assertTrue(132 - aecls.bufsz <= len(c1) <= | |
369 | 132 + aecls.bufsz + aecls.ohd) | |
370 | c2 = enc.encrypt(m[189:253]) | |
371 | me.assertEqual(enc.mlen, 253) | |
372 | me.assertTrue(64 - aecls.bufsz <= len(c2) <= | |
373 | 64 + aecls.bufsz + aecls.ohd) | |
374 | c3, t = enc.done(aad = aad) | |
375 | me.assertTrue(len(c3) <= aecls.bufsz + aecls.ohd) | |
376 | c = c0 + c1 + c2 + c3 | |
377 | me.assertTrue(len(m) <= len(c) <= len(m) + aecls.ohd) | |
378 | me.assertEqual(len(t), tsz) | |
379 | ||
380 | ## And now decrypt it again, with different record boundaries. | |
381 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
382 | me.assertEqual(dec.hsz, len(h)) | |
383 | me.assertEqual(dec.csz, len(c)) | |
384 | me.assertEqual(dec.clen, 0) | |
385 | me.assertEqual(dec.tsz, tsz) | |
386 | aad = dec.aad() | |
387 | if aecls.flags&C.AEADF_AADNDEP: me.assertEqual(aad.hsz, len(h)) | |
388 | else: me.assertEqual(aad.hsz, None) | |
389 | me.assertEqual(aad.hlen, 0) | |
390 | aad.hash(h) | |
391 | m0 = dec.decrypt(c[0:156]) | |
392 | me.assertTrue(156 - aecls.bufsz <= len(m0) <= 156) | |
393 | m1 = dec.decrypt(c[156:]) | |
394 | me.assertTrue(len(c) - 156 - aecls.bufsz <= len(m1) <= | |
395 | len(c) - 156 + aecls.bufsz) | |
396 | m2 = dec.done(tag = t, aad = aad) | |
397 | me.assertEqual(m0 + m1 + m2, m) | |
398 | ||
399 | ## And again, with the wrong tag. | |
400 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
401 | aad = dec.aad(); aad.hash(h) | |
402 | _ = dec.decrypt(c) | |
403 | me.assertRaises(ValueError, dec.done, tag = t ^ tsz*C.bytes("55")) | |
404 | ||
405 | ## Check that the all-in-one methods work. | |
406 | me.assertEqual((c, t), | |
407 | key.encrypt(n = n, h = h, m = m, tsz = tsz)) | |
408 | me.assertEqual(m, | |
409 | key.decrypt(n = n, h = h, c = c, t = t)) | |
410 | ||
411 | ## Check that bad key, nonce, and tag lengths are rejected. | |
412 | badlen = bad_key_size(aecls.keysz) | |
413 | if badlen is not None: me.assertRaises(ValueError, aecls, T.span(badlen)) | |
414 | badlen = bad_key_size(aecls.noncesz) | |
415 | if badlen is not None: | |
416 | me.assertRaises(ValueError, key.enc, nonce = T.span(badlen), | |
417 | hsz = len(h), msz = len(m), tsz = tsz) | |
418 | me.assertRaises(ValueError, key.dec, nonce = T.span(badlen), | |
419 | hsz = len(h), csz = len(c), tsz = tsz) | |
420 | if not aecls.flags&C.AEADF_PCTSZ: | |
421 | enc = key.enc(nonce = n, hsz = 0, msz = len(m)) | |
422 | _ = enc.encrypt(m) | |
423 | me.assertRaises(ValueError, enc.done, tsz = badlen) | |
424 | badlen = bad_key_size(aecls.tagsz) | |
425 | if badlen is not None: | |
426 | me.assertRaises(ValueError, key.enc, nonce = n, | |
427 | hsz = len(h), msz = len(m), tsz = badlen) | |
428 | me.assertRaises(ValueError, key.dec, nonce = n, | |
429 | hsz = len(h), csz = len(c), tsz = badlen) | |
430 | ||
431 | ## Check that we can't get a loose `aad' object from a scheme which has | |
432 | ## nonce-dependent AAD processing. | |
433 | if aecls.flags&C.AEADF_AADNDEP: me.assertRaises(ValueError, key.aad) | |
434 | ||
435 | ## Check the menagerie of AAD hashing methods. | |
436 | if not aecls.flags&C.AEADF_NOAAD: | |
437 | def mkhash(hsz): | |
438 | enc = key.enc(nonce = n, hsz = hsz, msz = 0, tsz = tsz) | |
439 | aad = enc.aad() | |
440 | return aad, lambda: enc.done(aad = aad)[1] | |
441 | me.check_hashbuffer(mkhash) | |
442 | ||
443 | ## Check that encryption/decryption works with the given precommitments. | |
444 | def quick_enc_check(**kw): | |
445 | enc = key.enc(**kw) | |
446 | aad = enc.aad().hash(h) | |
447 | c0 = enc.encrypt(m); c1, tt = enc.done(aad = aad, tsz = tsz) | |
448 | me.assertEqual((c, t), (c0 + c1, tt)) | |
449 | def quick_dec_check(**kw): | |
450 | dec = key.dec(**kw) | |
451 | aad = dec.aad().hash(h) | |
452 | m0 = dec.decrypt(c); m1 = dec.done(aad = aad, tag = t) | |
453 | me.assertEqual(m, m0 + m1) | |
454 | ||
455 | ## Check that we can get away without precommitting to the header length | |
456 | ## if and only if the AEAD scheme says it will let us. | |
457 | if aecls.flags&C.AEADF_PCHSZ: | |
458 | me.assertRaises(ValueError, key.enc, nonce = n, | |
459 | msz = len(m), tsz = tsz) | |
460 | me.assertRaises(ValueError, key.dec, nonce = n, | |
461 | csz = len(c), tsz = tsz) | |
462 | else: | |
463 | quick_enc_check(nonce = n, msz = len(m), tsz = tsz) | |
464 | quick_dec_check(nonce = n, csz = len(c), tsz = tsz) | |
465 | ||
466 | ## Check that we can get away without precommitting to the message/ | |
467 | ## ciphertext length if and only if the AEAD scheme says it will let us. | |
468 | if aecls.flags&C.AEADF_PCMSZ: | |
469 | me.assertRaises(ValueError, key.enc, nonce = n, | |
470 | hsz = len(h), tsz = tsz) | |
471 | me.assertRaises(ValueError, key.dec, nonce = n, | |
472 | hsz = len(h), tsz = tsz) | |
473 | else: | |
474 | quick_enc_check(nonce = n, hsz = len(h), tsz = tsz) | |
475 | quick_dec_check(nonce = n, hsz = len(h), tsz = tsz) | |
476 | ||
477 | ## Check that we can get away without precommitting to the tag length if | |
478 | ## and only if the AEAD scheme says it will let us. | |
479 | if aecls.flags&C.AEADF_PCTSZ: | |
480 | me.assertRaises(ValueError, key.enc, nonce = n, | |
481 | hsz = len(h), msz = len(m)) | |
482 | me.assertRaises(ValueError, key.dec, nonce = n, | |
483 | hsz = len(h), csz = len(c)) | |
484 | else: | |
485 | quick_enc_check(nonce = n, hsz = len(h), msz = len(m)) | |
486 | quick_dec_check(nonce = n, hsz = len(h), csz = len(c)) | |
487 | ||
488 | ## Check that if we precommit to the header length, we're properly held | |
489 | ## to the commitment. | |
490 | if not aecls.flags&C.AEADF_NOAAD: | |
491 | ||
492 | ## First, check encryption with underrun. If we must supply AAD first, | |
493 | ## then the underrun will be reported when we start trying to encrypt; | |
494 | ## otherwise, checking is delayed until `done'. | |
495 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
496 | aad = enc.aad().hash(h[0:83]) | |
497 | if aecls.flags&C.AEADF_AADFIRST: | |
498 | me.assertRaises(ValueError, enc.encrypt, m) | |
499 | else: | |
500 | _ = enc.encrypt(m) | |
501 | me.assertRaises(ValueError, enc.done, aad = aad) | |
502 | ||
503 | ## Next, check decryption with underrun. If we must supply AAD first, | |
504 | ## then the underrun will be reported when we start trying to encrypt; | |
505 | ## otherwise, checking is delayed until `done'. | |
506 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
507 | aad = dec.aad().hash(h[0:83]) | |
508 | if aecls.flags&C.AEADF_AADFIRST: | |
509 | me.assertRaises(ValueError, dec.decrypt, c) | |
510 | else: | |
511 | _ = dec.decrypt(c) | |
512 | me.assertRaises(ValueError, dec.done, tag = t, aad = aad) | |
513 | ||
514 | ## If AAD processing is nonce-dependent then an overrun will be | |
515 | ## detected imediately. | |
516 | if aecls.flags&C.AEADF_AADNDEP: | |
517 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
518 | aad = enc.aad().hash(h[0:83]) | |
519 | me.assertRaises(ValueError, aad.hash, h[82:131]) | |
520 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
521 | aad = dec.aad().hash(h[0:83]) | |
522 | me.assertRaises(ValueError, aad.hash, h[82:131]) | |
523 | ||
524 | ## Some additional tests for nonce-dependent `aad' objects. | |
525 | if aecls.flags&C.AEADF_AADNDEP: | |
526 | ||
527 | ## Check that `aad' objects can't be used once their parents are gone. | |
528 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
529 | aad = enc.aad() | |
530 | del enc | |
531 | me.assertRaises(ValueError, aad.hash, h) | |
532 | ||
533 | ## Check that they can't be crossed over. | |
534 | enc0 = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
535 | enc1 = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
536 | enc0.aad().hash(h) | |
537 | aad1 = enc1.aad().hash(h) | |
538 | _ = enc0.encrypt(m) | |
539 | me.assertRaises(ValueError, enc0.done, tsz = tsz, aad = aad1) | |
540 | ||
541 | ## Test copying AAD. | |
542 | if not aecls.flags&C.AEADF_AADNDEP and not aecls.flags&C.AEADF_NOAAD: | |
543 | aad0 = key.aad() | |
544 | aad0.hash(h[0:83]) | |
545 | aad1 = aad0.copy() | |
546 | aad2 = aad1.copy() | |
547 | aad0.hash(h[83:131]) | |
548 | aad1.hash(h[83:131]) | |
549 | aad2.hash(h[83:131] ^ 48*C.bytes("ff")) | |
550 | me.assertEqual(key.enc(nonce = n, hsz = len(h), | |
551 | msz = 0, tsz = tsz).done(aad = aad0), | |
552 | key.enc(nonce = n, hsz = len(h), | |
553 | msz = 0, tsz = tsz).done(aad = aad1)) | |
554 | me.assertNotEqual(key.enc(nonce = n, hsz = len(h), | |
555 | msz = 0, tsz = tsz).done(aad = aad0), | |
556 | key.enc(nonce = n, hsz = len(h), | |
557 | msz = 0, tsz = tsz).done(aad = aad2)) | |
558 | ||
559 | ## Check that if we precommit to the message length, we're properly held | |
560 | ## to the commitment. (Fortunately, this is way simpler than the AAD | |
561 | ## case above.) First, try an underrun. | |
562 | enc = key.enc(nonce = n, hsz = 0, msz = len(m), tsz = tsz) | |
563 | _ = enc.encrypt(m[0:183]) | |
564 | me.assertRaises(ValueError, enc.done, tsz = tsz) | |
565 | dec = key.dec(nonce = n, hsz = 0, csz = len(c), tsz = tsz) | |
566 | _ = dec.decrypt(c[0:183]) | |
567 | me.assertRaises(ValueError, dec.done, tag = t) | |
568 | ||
569 | ## And now an overrun. | |
570 | enc = key.enc(nonce = n, hsz = 0, msz = 183, tsz = tsz) | |
571 | me.assertRaises(ValueError, enc.encrypt, m) | |
572 | dec = key.dec(nonce = n, hsz = 0, csz = 183, tsz = tsz) | |
573 | me.assertRaises(ValueError, dec.decrypt, c) | |
574 | ||
575 | ## Finally, check that if we precommit to a tag length, we're properly | |
576 | ## held to the commitment. This depends on being able to find a tag size | |
577 | ## which isn't the default. | |
578 | tsz1 = different_key_size(aecls.tagsz, tsz) | |
579 | if tsz1 is not None: | |
580 | enc = key.enc(nonce = n, hsz = 0, msz = len(m), tsz = tsz1) | |
581 | _ = enc.encrypt(m) | |
582 | me.assertRaises(ValueError, enc.done, tsz = tsz) | |
583 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz1) | |
584 | aad = dec.aad().hash(h) | |
585 | _ = dec.decrypt(c) | |
586 | me.assertRaises(ValueError, enc.done, tsz = tsz, aad = aad) | |
587 | ||
588 | TestAuthenticatedEncryption.generate_testcases \ | |
589 | ((name, C.gcaeads[name]) for name in | |
590 | ["des3-ccm", "blowfish-ocb1", "square-ocb3", "rijndael-gcm", | |
591 | "serpent-eax", "salsa20-naclbox", "chacha20-poly1305"]) | |
592 | ||
593 | ###-------------------------------------------------------------------------- | |
553d59fe MW |
594 | class BaseTestHash (HashBufferTestMixin): |
595 | """Base class for testing hash functions.""" | |
596 | ||
597 | def check_hash(me, hcls, need_bufsz = True): | |
598 | """ | |
599 | Check hash class HCLS. | |
600 | ||
71574cba MW |
601 | If NEED_BUFSZ is false, then don't insist that HCLS has a working `bufsz' |
602 | attribute. This test is mostly reused for MACs, which don't have this | |
603 | attribute. | |
553d59fe MW |
604 | """ |
605 | ## Check the class properties. | |
71574cba MW |
606 | me.assertEqual(type(hcls.name), str) |
607 | if need_bufsz: me.assertEqual(type(hcls.bufsz), int) | |
608 | me.assertEqual(type(hcls.hashsz), int) | |
553d59fe MW |
609 | |
610 | ## Set some initial values. | |
611 | m = T.span(131) | |
612 | h = hcls().hash(m).done() | |
613 | ||
614 | ## Check that hash length comes out right. | |
71574cba | 615 | me.assertEqual(len(h), hcls.hashsz) |
553d59fe MW |
616 | |
617 | ## Check that we get the same answer if we split the message up. | |
618 | me.assertEqual(h, hcls().hash(m[0:73]).hash(m[73:131]).done()) | |
619 | ||
620 | ## Check the `check' method. | |
621 | me.assertTrue(hcls().hash(m).check(h)) | |
71574cba | 622 | me.assertFalse(hcls().hash(m).check(h ^ hcls.hashsz*C.bytes("aa"))) |
553d59fe MW |
623 | |
624 | ## Check the menagerie of random hashing methods. | |
625 | def mkhash(_): | |
626 | h = hcls() | |
627 | return h, h.done | |
628 | me.check_hashbuffer(mkhash) | |
629 | ||
630 | class TestHash (BaseTestHash, T.GenericTestMixin): | |
631 | """Test hash functions.""" | |
632 | def _test_hash(me, hcls): me.check_hash(hcls, need_bufsz = True) | |
633 | ||
634 | TestHash.generate_testcases((name, C.gchashes[name]) for name in | |
635 | ["md5", "sha", "whirlpool", "sha256", "sha512/224", "sha3-384", "shake256", | |
636 | "crc32"]) | |
637 | ||
638 | ###-------------------------------------------------------------------------- | |
639 | class TestMessageAuthentication (BaseTestHash, T.GenericTestMixin): | |
640 | """Test message authentication codes.""" | |
641 | ||
642 | def _test_mac(me, mcls): | |
643 | ||
644 | ## Check the MAC properties. | |
645 | me.assertEqual(type(mcls.name), str) | |
646 | me.assertTrue(isinstance(mcls.keysz, C.KeySZ)) | |
647 | me.assertEqual(type(mcls.tagsz), int) | |
648 | ||
649 | ## Test hashing. | |
650 | k = T.span(mcls.keysz.default) | |
651 | key = mcls(k) | |
71574cba | 652 | me.assertEqual(key.hashsz, key.tagsz) |
553d59fe MW |
653 | me.check_hash(key, need_bufsz = False) |
654 | ||
655 | ## Check that bad key lengths are rejected. | |
656 | badlen = bad_key_size(mcls.keysz) | |
657 | if badlen is not None: me.assertRaises(ValueError, mcls, T.span(badlen)) | |
658 | ||
659 | TestMessageAuthentication.generate_testcases \ | |
660 | ((name, C.gcmacs[name]) for name in | |
661 | ["sha-hmac", "rijndael-cmac", "twofish-pmac1", "kmac128"]) | |
662 | ||
663 | class TestPoly1305 (HashBufferTestMixin): | |
664 | """Check the Poly1305 one-time message authentication function.""" | |
665 | ||
666 | def test_poly1305(me): | |
667 | ||
668 | ## Check the MAC properties. | |
669 | me.assertEqual(C.poly1305.name, "poly1305") | |
670 | me.assertEqual(type(C.poly1305.keysz), C.KeySZSet) | |
671 | me.assertEqual(C.poly1305.keysz.default, 16) | |
fd46a88d | 672 | me.assertEqual(C.poly1305.keysz.set, set([16])) |
553d59fe MW |
673 | me.assertEqual(C.poly1305.tagsz, 16) |
674 | me.assertEqual(C.poly1305.masksz, 16) | |
675 | ||
676 | ## Set some initial values. | |
677 | k = T.span(16) | |
678 | u = T.span(64)[-16:] | |
679 | m = T.span(149) | |
680 | key = C.poly1305(k) | |
681 | t = key(u).hash(m).done() | |
682 | ||
683 | ## Check the key properties. | |
71574cba MW |
684 | me.assertEqual(key.name, "poly1305") |
685 | me.assertEqual(key.tagsz, 16) | |
686 | me.assertEqual(key.tagsz, 16) | |
553d59fe MW |
687 | me.assertEqual(len(t), 16) |
688 | ||
689 | ## Check that we get the same answer if we split the message up. | |
690 | me.assertEqual(t, key(u).hash(m[0:86]).hash(m[86:149]).done()) | |
691 | ||
692 | ## Check the `check' method. | |
693 | me.assertTrue(key(u).hash(m).check(t)) | |
694 | me.assertFalse(key(u).hash(m).check(t ^ 16*C.bytes("cc"))) | |
695 | ||
696 | ## Check the menagerie of random hashing methods. | |
697 | def mkhash(_): | |
698 | h = key(u) | |
699 | return h, h.done | |
700 | me.check_hashbuffer(mkhash) | |
701 | ||
702 | ## Check that we can't complete hashing without a mask. | |
703 | me.assertRaises(ValueError, key().hash(m).done) | |
704 | ||
705 | ## Check `concat'. | |
706 | h0 = key().hash(m[0:96]) | |
707 | h1 = key().hash(m[96:117]) | |
708 | me.assertEqual(t, key(u).concat(h0, h1).hash(m[117:149]).done()) | |
709 | key1 = C.poly1305(k) | |
710 | me.assertRaises(TypeError, key().concat, key1().hash(m[0:96]), h1) | |
711 | me.assertRaises(TypeError, key().concat, h0, key1().hash(m[96:117])) | |
712 | me.assertRaises(ValueError, key().concat, key().hash(m[0:93]), h1) | |
713 | ||
714 | ###-------------------------------------------------------------------------- | |
715 | class TestHLatin (U.TestCase): | |
716 | """Test the `hsalsa20' and `hchacha20' functions.""" | |
717 | ||
718 | def test_hlatin(me): | |
3b5f9ac0 | 719 | kk = [T.span(sz) for sz in [10, 16, 32]] |
553d59fe MW |
720 | n = T.span(16) |
721 | bad_k = T.span(18) | |
722 | bad_n = T.span(13) | |
723 | for fn in [C.hsalsa208_prf, C.hsalsa2012_prf, C.hsalsa20_prf, | |
724 | C.hchacha8_prf, C.hchacha12_prf, C.hchacha20_prf]: | |
725 | for k in kk: | |
726 | h = fn(k, n) | |
727 | me.assertEqual(len(h), 32) | |
728 | me.assertRaises(ValueError, fn, bad_k, n) | |
729 | me.assertRaises(ValueError, fn, k, bad_n) | |
730 | ||
731 | ###-------------------------------------------------------------------------- | |
732 | class TestKeccak (HashBufferTestMixin): | |
733 | """Test the Keccak-p[1600, n] sponge function.""" | |
734 | ||
735 | def test_keccak(me): | |
736 | ||
737 | ## Make a state and feed some stuff into it. | |
738 | m0 = T.bin("some initial string") | |
739 | m1 = T.bin("awesome follow-up string") | |
740 | st0 = C.Keccak1600() | |
741 | me.assertEqual(st0.nround, 24) | |
742 | st0.mix(m0).step() | |
743 | ||
744 | ## Make another step with a different round count. | |
745 | st1 = C.Keccak1600(23) | |
746 | st1.mix(m0).step() | |
747 | me.assertNotEqual(st0.extract(32), st1.extract(32)) | |
748 | ||
dad564fa MW |
749 | ## Check state copying. |
750 | st1 = st0.copy() | |
751 | mask = st1.extract(len(m1)) | |
752 | st0.mix(m1) | |
753 | st1.mix(m1) | |
754 | me.assertEqual(st0.extract(32), st1.extract(32)) | |
755 | ||
553d59fe MW |
756 | ## Check error conditions. |
757 | _ = st0.extract(200) | |
758 | me.assertRaises(ValueError, st0.extract, 201) | |
759 | st0.mix(T.span(200)) | |
760 | me.assertRaises(ValueError, st0.mix, T.span(201)) | |
761 | ||
762 | def check_shake(me, xcls, c, done_matches_xof = True): | |
763 | """ | |
764 | Test the SHAKE and cSHAKE XOFs. | |
765 | ||
766 | This is also used for testing KMAC, but that sets DONE_MATCHES_XOF false | |
767 | to indicate that the XOF output is range-separated from the fixed-length | |
768 | outputs (unlike the basic SHAKE functions). | |
769 | """ | |
770 | ||
771 | ## Check the hash attributes. | |
772 | x = xcls() | |
773 | me.assertEqual(x.rate, 200 - c) | |
774 | me.assertEqual(x.buffered, 0) | |
775 | me.assertEqual(x.state, "absorb") | |
776 | ||
777 | ## Set some initial values. | |
778 | func = T.bin("TESTXOF") | |
779 | perso = T.bin("catacomb-python test") | |
780 | m = T.span(167) | |
781 | h0 = xcls().hash(m).done(193) | |
782 | me.assertEqual(len(h0), 193) | |
783 | h1 = xcls(func = func, perso = perso).hash(m).done(193) | |
784 | me.assertEqual(len(h1), 193) | |
785 | me.assertNotEqual(h0, h1) | |
786 | ||
787 | ## Check input and output in pieces, and the state machine. | |
788 | if done_matches_xof: h = h0 | |
789 | else: h = xcls().hash(m).xof().get(len(h0)) | |
790 | x = xcls().hash(m[0:76]).hash(m[76:167]).xof() | |
791 | me.assertEqual(h, x.get(98) + x.get(95)) | |
792 | ||
793 | ## Check masking. | |
794 | x = xcls().hash(m).xof() | |
49e3a113 | 795 | me.assertEqual(x.mask(m), m ^ h[0:len(m)]) |
553d59fe MW |
796 | |
797 | ## Check the `check' method. | |
798 | me.assertTrue(xcls().hash(m).check(h0)) | |
799 | me.assertFalse(xcls().hash(m).check(h1)) | |
800 | ||
801 | ## Check the menagerie of random hashing methods. | |
802 | def mkhash(_): | |
803 | x = xcls(func = func, perso = perso) | |
aaf8c7aa | 804 | return x, x.done |
553d59fe MW |
805 | me.check_hashbuffer(mkhash) |
806 | ||
807 | ## Check the state machine tracking. | |
808 | x = xcls(); me.assertEqual(x.state, "absorb") | |
809 | x.hash(m); me.assertEqual(x.state, "absorb") | |
810 | xx = x.copy() | |
aaf8c7aa | 811 | h = xx.done(); me.assertEqual(len(h), 100 - x.rate//2) |
553d59fe MW |
812 | me.assertEqual(xx.state, "dead") |
813 | me.assertRaises(ValueError, xx.done, 1) | |
814 | me.assertRaises(ValueError, xx.get, 1) | |
815 | me.assertEqual(x.state, "absorb") | |
816 | me.assertRaises(ValueError, x.get, 1) | |
817 | x.xof(); me.assertEqual(x.state, "squeeze") | |
818 | me.assertRaises(ValueError, x.done, 1) | |
819 | _ = x.get(1) | |
820 | yy = x.copy(); me.assertEqual(yy.state, "squeeze") | |
821 | ||
822 | def test_shake128(me): me.check_shake(C.Shake128, 32) | |
823 | def test_shake256(me): me.check_shake(C.Shake256, 64) | |
824 | ||
825 | def check_kmac(me, mcls, c): | |
826 | k = T.span(32) | |
04b75d71 | 827 | me.check_shake(lambda func = None, perso = None: |
553d59fe MW |
828 | mcls(k, perso = perso), |
829 | c, done_matches_xof = False) | |
830 | ||
831 | def test_kmac128(me): me.check_kmac(C.KMAC128, 32) | |
832 | def test_kmac256(me): me.check_kmac(C.KMAC256, 64) | |
833 | ||
834 | ###-------------------------------------------------------------------------- | |
835 | class TestPRP (T.GenericTestMixin): | |
836 | """Test pseudorandom permutations (PRPs).""" | |
837 | ||
838 | def _test_prp(me, pcls): | |
839 | ||
840 | ## Check the PRP properties. | |
841 | me.assertEqual(type(pcls.name), str) | |
842 | me.assertTrue(isinstance(pcls.keysz, C.KeySZ)) | |
843 | me.assertEqual(type(pcls.blksz), int) | |
844 | ||
845 | ## Check round-tripping. | |
846 | k = T.span(pcls.keysz.default) | |
847 | key = pcls(k) | |
848 | m = T.span(pcls.blksz) | |
849 | c = key.encrypt(m) | |
850 | me.assertEqual(len(c), pcls.blksz) | |
851 | me.assertEqual(m, key.decrypt(c)) | |
852 | ||
853 | ## Check that bad key lengths are rejected. | |
854 | badlen = bad_key_size(pcls.keysz) | |
855 | if badlen is not None: me.assertRaises(ValueError, pcls, T.span(badlen)) | |
856 | ||
857 | ## Check that bad blocks are rejected. | |
858 | badblk = T.span(pcls.blksz + 1) | |
859 | me.assertRaises(ValueError, key.encrypt, badblk) | |
860 | me.assertRaises(ValueError, key.decrypt, badblk) | |
861 | ||
862 | TestPRP.generate_testcases((name, C.gcprps[name]) for name in | |
863 | ["desx", "blowfish", "rijndael"]) | |
864 | ||
865 | ###----- That's all, folks -------------------------------------------------- | |
866 | ||
867 | if __name__ == "__main__": U.main() |