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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 | |
8d507e79 | 41 | elif ksz.max is not None: return ksz.max + 1 |
ffad1322 MW |
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 | |
8d507e79 | 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) | |
79 | me.assertRaises((OverflowError, ValueError), | |
80 | hashfn, h0, 1 << 8*w) | |
81 | ||
82 | def check_hashbuffer_bufn(me, w, bigendp, makefn, hashfn): | |
83 | """Check `hashbufN'.""" | |
84 | ||
85 | ## Go through a number of different sizes. | |
86 | for n in [0, 1, 7, 8, 19, 255, 12345, 65535, 123456]: | |
87 | if n >= 1 << 8*w: continue | |
88 | h0, donefn0 = makefn(2 + w + n) | |
89 | hashfn(h0.hashu8(0x00), T.span(n)).hashu8(0xff) | |
90 | h1, donefn1 = makefn(2 + w + n) | |
91 | h1.hash(T.prep_lenseq(w, n, bigendp, True)) | |
92 | me.assertEqual(donefn0(), donefn1()) | |
93 | ||
94 | ## Check blocks which are too large for the length prefix. | |
95 | if w <= 3: | |
96 | n = 1 << 8*w | |
97 | h0, _ = makefn(w + n) | |
98 | me.assertRaises((ValueError, OverflowError, TypeError), | |
99 | hashfn, h0, C.ByteString.zero(n)) | |
100 | ||
101 | def check_hashbuffer(me, makefn): | |
102 | """Test the various `hash...' methods.""" | |
103 | ||
104 | ## Check `hashuN'. | |
105 | me.check_hashbuffer_hashn(1, True, makefn, lambda h, n: h.hashu8(n)) | |
106 | me.check_hashbuffer_hashn(2, True, makefn, lambda h, n: h.hashu16(n)) | |
107 | me.check_hashbuffer_hashn(2, True, makefn, lambda h, n: h.hashu16b(n)) | |
108 | me.check_hashbuffer_hashn(2, False, makefn, lambda h, n: h.hashu16l(n)) | |
109 | if hasattr(makefn(0)[0], "hashu24"): | |
110 | me.check_hashbuffer_hashn(3, True, makefn, lambda h, n: h.hashu24(n)) | |
111 | me.check_hashbuffer_hashn(3, True, makefn, lambda h, n: h.hashu24b(n)) | |
112 | me.check_hashbuffer_hashn(3, False, makefn, lambda h, n: h.hashu24l(n)) | |
113 | me.check_hashbuffer_hashn(4, True, makefn, lambda h, n: h.hashu32(n)) | |
114 | me.check_hashbuffer_hashn(4, True, makefn, lambda h, n: h.hashu32b(n)) | |
115 | me.check_hashbuffer_hashn(4, False, makefn, lambda h, n: h.hashu32l(n)) | |
116 | if hasattr(makefn(0)[0], "hashu64"): | |
117 | me.check_hashbuffer_hashn(8, True, makefn, lambda h, n: h.hashu64(n)) | |
118 | me.check_hashbuffer_hashn(8, True, makefn, lambda h, n: h.hashu64b(n)) | |
119 | me.check_hashbuffer_hashn(8, False, makefn, lambda h, n: h.hashu64l(n)) | |
120 | ||
121 | ## Check `hashbufN'. | |
122 | me.check_hashbuffer_bufn(1, True, makefn, lambda h, x: h.hashbuf8(x)) | |
123 | me.check_hashbuffer_bufn(2, True, makefn, lambda h, x: h.hashbuf16(x)) | |
124 | me.check_hashbuffer_bufn(2, True, makefn, lambda h, x: h.hashbuf16b(x)) | |
125 | me.check_hashbuffer_bufn(2, False, makefn, lambda h, x: h.hashbuf16l(x)) | |
126 | if hasattr(makefn(0)[0], "hashbuf24"): | |
127 | me.check_hashbuffer_bufn(3, True, makefn, lambda h, x: h.hashbuf24(x)) | |
128 | me.check_hashbuffer_bufn(3, True, makefn, lambda h, x: h.hashbuf24b(x)) | |
129 | me.check_hashbuffer_bufn(3, False, makefn, lambda h, x: h.hashbuf24l(x)) | |
130 | me.check_hashbuffer_bufn(4, True, makefn, lambda h, x: h.hashbuf32(x)) | |
131 | me.check_hashbuffer_bufn(4, True, makefn, lambda h, x: h.hashbuf32b(x)) | |
132 | me.check_hashbuffer_bufn(4, False, makefn, lambda h, x: h.hashbuf32l(x)) | |
133 | if hasattr(makefn(0)[0], "hashbuf64"): | |
134 | me.check_hashbuffer_bufn(8, True, makefn, lambda h, x: h.hashbuf64(x)) | |
135 | me.check_hashbuffer_bufn(8, True, makefn, lambda h, x: h.hashbuf64b(x)) | |
136 | me.check_hashbuffer_bufn(8, False, makefn, lambda h, x: h.hashbuf64l(x)) | |
137 | ||
138 | ###-------------------------------------------------------------------------- | |
139 | class TestKeysize (U.TestCase): | |
140 | ||
141 | def test_any(me): | |
142 | ||
143 | ## A typical one-byte spec. | |
144 | ksz = C.seal.keysz | |
145 | me.assertEqual(type(ksz), C.KeySZAny) | |
146 | me.assertEqual(ksz.default, 20) | |
147 | me.assertEqual(ksz.min, 0) | |
8d507e79 | 148 | me.assertEqual(ksz.max, None) |
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149 | for n in [0, 12, 20, 5000]: |
150 | me.assertTrue(ksz.check(n)) | |
151 | me.assertEqual(ksz.best(n), n) | |
1752830c | 152 | me.assertEqual(ksz.pad(n), n) |
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153 | |
154 | ## A typical two-byte spec. (No published algorithms actually /need/ a | |
155 | ## two-byte key-size spec, but all of the HMAC variants use one anyway.) | |
156 | ksz = C.sha256_hmac.keysz | |
157 | me.assertEqual(type(ksz), C.KeySZAny) | |
158 | me.assertEqual(ksz.default, 32) | |
159 | me.assertEqual(ksz.min, 0) | |
8d507e79 | 160 | me.assertEqual(ksz.max, None) |
ffad1322 MW |
161 | for n in [0, 12, 20, 5000]: |
162 | me.assertTrue(ksz.check(n)) | |
163 | me.assertEqual(ksz.best(n), n) | |
1752830c | 164 | me.assertEqual(ksz.pad(n), n) |
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165 | |
166 | ## Check construction. | |
167 | ksz = C.KeySZAny(15) | |
168 | me.assertEqual(ksz.default, 15) | |
169 | me.assertEqual(ksz.min, 0) | |
8d507e79 | 170 | me.assertEqual(ksz.max, None) |
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171 | me.assertRaises(ValueError, lambda: C.KeySZAny(-8)) |
172 | me.assertEqual(C.KeySZAny(0).default, 0) | |
173 | ||
174 | def test_set(me): | |
175 | ## Note that no published algorithm uses a 16-bit `set' spec. | |
176 | ||
177 | ## A typical spec. | |
178 | ksz = C.salsa20.keysz | |
179 | me.assertEqual(type(ksz), C.KeySZSet) | |
180 | me.assertEqual(ksz.default, 32) | |
181 | me.assertEqual(ksz.min, 10) | |
182 | me.assertEqual(ksz.max, 32) | |
10011e42 | 183 | me.assertEqual(ksz.set, set([10, 16, 32])) |
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184 | for x, best, pad in [(9, None, 10), (10, 10, 10), (11, 10, 16), |
185 | (15, 10, 16), (16, 16, 16), (17, 16, 32), | |
186 | (31, 16, 32), (32, 32, 32), (33, 32, None)]: | |
187 | if x == best == pad: me.assertTrue(ksz.check(x)) | |
188 | else: me.assertFalse(ksz.check(x)) | |
189 | if best is None: me.assertRaises(ValueError, ksz.best, x) | |
190 | else: me.assertEqual(ksz.best(x), best) | |
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191 | if pad is None: me.assertRaises(ValueError, ksz.pad, x) |
192 | else: me.assertEqual(ksz.pad(x), pad) | |
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193 | |
194 | ## Check construction. | |
195 | ksz = C.KeySZSet(7) | |
196 | me.assertEqual(ksz.default, 7) | |
10011e42 | 197 | me.assertEqual(ksz.set, set([7])) |
ffad1322 MW |
198 | me.assertEqual(ksz.min, 7) |
199 | me.assertEqual(ksz.max, 7) | |
10011e42 | 200 | ksz = C.KeySZSet(7, iter([3, 6, 9])) |
ffad1322 | 201 | me.assertEqual(ksz.default, 7) |
10011e42 | 202 | me.assertEqual(ksz.set, set([3, 6, 7, 9])) |
ffad1322 MW |
203 | me.assertEqual(ksz.min, 3) |
204 | me.assertEqual(ksz.max, 9) | |
205 | ||
206 | def test_range(me): | |
207 | ## Note that no published algorithm uses a 16-bit `range' spec, or an | |
208 | ## unbounded `range'. | |
209 | ||
210 | ## A typical spec. | |
211 | ksz = C.rijndael.keysz | |
212 | me.assertEqual(type(ksz), C.KeySZRange) | |
213 | me.assertEqual(ksz.default, 32) | |
214 | me.assertEqual(ksz.min, 4) | |
215 | me.assertEqual(ksz.max, 32) | |
216 | me.assertEqual(ksz.mod, 4) | |
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217 | for x, best, pad in [(3, None, 4), (4, 4, 4), (5, 4, 8), |
218 | (15, 12, 16), (16, 16, 16), (17, 16, 20), | |
219 | (31, 28, 32), (32, 32, 32), (33, 32, None)]: | |
220 | if x == best == pad: me.assertTrue(ksz.check(x)) | |
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221 | else: me.assertFalse(ksz.check(x)) |
222 | if best is None: me.assertRaises(ValueError, ksz.best, x) | |
223 | else: me.assertEqual(ksz.best(x), best) | |
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224 | if pad is None: me.assertRaises(ValueError, ksz.pad, x) |
225 | else: me.assertEqual(ksz.pad(x), pad) | |
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226 | |
227 | ## Check construction. | |
228 | ksz = C.KeySZRange(28, 21, 35, 7) | |
229 | me.assertEqual(ksz.default, 28) | |
230 | me.assertEqual(ksz.min, 21) | |
231 | me.assertEqual(ksz.max, 35) | |
232 | me.assertEqual(ksz.mod, 7) | |
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233 | ksz = C.KeySZRange(28, 21, None, 7) |
234 | me.assertEqual(ksz.min, 21) | |
235 | me.assertEqual(ksz.max, None) | |
236 | me.assertEqual(ksz.mod, 7) | |
237 | me.assertEqual(ksz.pad(36), 42) | |
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238 | me.assertRaises(ValueError, C.KeySZRange, 29, 21, 35, 7) |
239 | me.assertRaises(ValueError, C.KeySZRange, 28, 20, 35, 7) | |
240 | me.assertRaises(ValueError, C.KeySZRange, 28, 21, 34, 7) | |
241 | me.assertRaises(ValueError, C.KeySZRange, 28, -7, 35, 7) | |
242 | me.assertRaises(ValueError, C.KeySZRange, 28, 35, 21, 7) | |
243 | me.assertRaises(ValueError, C.KeySZRange, 35, 21, 28, 7) | |
244 | me.assertRaises(ValueError, C.KeySZRange, 21, 28, 35, 7) | |
245 | ||
246 | def test_conversions(me): | |
247 | me.assertEqual(C.KeySZ.fromec(256), 128) | |
248 | me.assertEqual(C.KeySZ.fromschnorr(256), 128) | |
249 | me.assertEqual(round(C.KeySZ.fromdl(2958.6875)), 128) | |
250 | me.assertEqual(round(C.KeySZ.fromif(2958.6875)), 128) | |
251 | me.assertEqual(C.KeySZ.toec(128), 256) | |
252 | me.assertEqual(C.KeySZ.toschnorr(128), 256) | |
253 | me.assertEqual(C.KeySZ.todl(128), 2958.6875) | |
254 | me.assertEqual(C.KeySZ.toif(128), 2958.6875) | |
255 | ||
256 | ###-------------------------------------------------------------------------- | |
257 | class TestCipher (T.GenericTestMixin): | |
258 | """Test basic symmetric ciphers.""" | |
259 | ||
260 | def _test_cipher(me, ccls): | |
261 | ||
262 | ## Check the class properties. | |
263 | me.assertEqual(type(ccls.name), str) | |
264 | me.assertTrue(isinstance(ccls.keysz, C.KeySZ)) | |
265 | me.assertEqual(type(ccls.blksz), int) | |
266 | ||
267 | ## Check round-tripping. | |
268 | k = T.span(ccls.keysz.default) | |
269 | iv = T.span(ccls.blksz) | |
270 | m = T.span(253) | |
271 | enc = ccls(k) | |
272 | dec = ccls(k) | |
273 | try: enc.setiv(iv) | |
274 | except ValueError: can_setiv = False | |
275 | else: | |
276 | can_setiv = True | |
277 | dec.setiv(iv) | |
278 | c0 = enc.encrypt(m[0:57]) | |
279 | m0 = dec.decrypt(c0) | |
280 | c1 = enc.encrypt(m[57:189]) | |
281 | m1 = dec.decrypt(c1) | |
282 | try: enc.bdry() | |
283 | except ValueError: can_bdry = False | |
284 | else: | |
285 | dec.bdry() | |
286 | can_bdry = True | |
287 | c2 = enc.encrypt(m[189:253]) | |
288 | m2 = dec.decrypt(c2) | |
289 | me.assertEqual(len(c0) + len(c1) + len(c2), len(m)) | |
290 | me.assertEqual(m0, m[0:57]) | |
291 | me.assertEqual(m1, m[57:189]) | |
292 | me.assertEqual(m2, m[189:253]) | |
293 | ||
294 | ## Check the `enczero' and `deczero' methods. | |
295 | c3 = enc.enczero(32) | |
296 | me.assertEqual(dec.decrypt(c3), C.ByteString.zero(32)) | |
297 | m4 = dec.deczero(32) | |
298 | me.assertEqual(enc.encrypt(m4), C.ByteString.zero(32)) | |
299 | ||
300 | ## Check that ciphers which support a `boundary' operation actually | |
301 | ## need it. | |
302 | if can_bdry: | |
303 | dec = ccls(k) | |
304 | if can_setiv: dec.setiv(iv) | |
305 | m01 = dec.decrypt(c0 + c1) | |
306 | me.assertEqual(m01, m[0:189]) | |
307 | ||
308 | ## Check that the boundary actually does something. | |
309 | if can_bdry: | |
310 | dec = ccls(k) | |
311 | if can_setiv: dec.setiv(iv) | |
312 | m012 = dec.decrypt(c0 + c1 + c2) | |
313 | me.assertNotEqual(m012, m) | |
314 | ||
315 | ## Check that bad key lengths are rejected. | |
316 | badlen = bad_key_size(ccls.keysz) | |
317 | if badlen is not None: me.assertRaises(ValueError, ccls, T.span(badlen)) | |
318 | ||
319 | TestCipher.generate_testcases((name, C.gcciphers[name]) for name in | |
320 | ["des-ecb", "rijndael-cbc", "twofish-cfb", "serpent-ofb", | |
321 | "blowfish-counter", "rc4", "seal", "salsa20/8", "shake128-xof"]) | |
322 | ||
323 | ###-------------------------------------------------------------------------- | |
77f6ff2d MW |
324 | class TestAuthenticatedEncryption \ |
325 | (HashBufferTestMixin, T.GenericTestMixin): | |
326 | """Test authenticated encryption schemes.""" | |
327 | ||
328 | def _test_aead(me, aecls): | |
329 | ||
330 | ## Check the class properties. | |
331 | me.assertEqual(type(aecls.name), str) | |
332 | me.assertTrue(isinstance(aecls.keysz, C.KeySZ)) | |
333 | me.assertTrue(isinstance(aecls.noncesz, C.KeySZ)) | |
334 | me.assertTrue(isinstance(aecls.tagsz, C.KeySZ)) | |
335 | me.assertEqual(type(aecls.blksz), int) | |
336 | me.assertEqual(type(aecls.bufsz), int) | |
337 | me.assertEqual(type(aecls.ohd), int) | |
338 | me.assertEqual(type(aecls.flags), int) | |
339 | ||
340 | ## Check round-tripping, with full precommitment. First, select some | |
341 | ## parameters. (It's conceivable that some AEAD schemes are more | |
342 | ## restrictive than advertised by the various properties, but this works | |
343 | ## out OK in practice.) | |
344 | k = T.span(aecls.keysz.default) | |
345 | n = T.span(aecls.noncesz.default) | |
346 | if aecls.flags&C.AEADF_NOAAD: h = T.span(0) | |
347 | else: h = T.span(131) | |
348 | m = T.span(253) | |
349 | tsz = aecls.tagsz.default | |
350 | key = aecls(k) | |
351 | ||
352 | ## Next, encrypt a message, checking that things are proper as we go. | |
353 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
354 | me.assertEqual(enc.hsz, len(h)) | |
355 | me.assertEqual(enc.msz, len(m)) | |
356 | me.assertEqual(enc.mlen, 0) | |
357 | me.assertEqual(enc.tsz, tsz) | |
358 | aad = enc.aad() | |
359 | if aecls.flags&C.AEADF_AADNDEP: me.assertEqual(aad.hsz, len(h)) | |
360 | else: me.assertEqual(aad.hsz, None) | |
361 | me.assertEqual(aad.hlen, 0) | |
362 | if not aecls.flags&C.AEADF_NOAAD: | |
363 | aad.hash(h[0:83]) | |
364 | me.assertEqual(aad.hlen, 83) | |
365 | aad.hash(h[83:131]) | |
366 | me.assertEqual(aad.hlen, 131) | |
367 | c0 = enc.encrypt(m[0:57]) | |
368 | me.assertEqual(enc.mlen, 57) | |
369 | me.assertTrue(57 - aecls.bufsz <= len(c0) <= 57 + aecls.ohd) | |
370 | c1 = enc.encrypt(m[57:189]) | |
371 | me.assertEqual(enc.mlen, 189) | |
372 | me.assertTrue(132 - aecls.bufsz <= len(c1) <= | |
373 | 132 + aecls.bufsz + aecls.ohd) | |
374 | c2 = enc.encrypt(m[189:253]) | |
375 | me.assertEqual(enc.mlen, 253) | |
376 | me.assertTrue(64 - aecls.bufsz <= len(c2) <= | |
377 | 64 + aecls.bufsz + aecls.ohd) | |
378 | c3, t = enc.done(aad = aad) | |
379 | me.assertTrue(len(c3) <= aecls.bufsz + aecls.ohd) | |
380 | c = c0 + c1 + c2 + c3 | |
381 | me.assertTrue(len(m) <= len(c) <= len(m) + aecls.ohd) | |
382 | me.assertEqual(len(t), tsz) | |
383 | ||
384 | ## And now decrypt it again, with different record boundaries. | |
385 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
386 | me.assertEqual(dec.hsz, len(h)) | |
387 | me.assertEqual(dec.csz, len(c)) | |
388 | me.assertEqual(dec.clen, 0) | |
389 | me.assertEqual(dec.tsz, tsz) | |
390 | aad = dec.aad() | |
391 | if aecls.flags&C.AEADF_AADNDEP: me.assertEqual(aad.hsz, len(h)) | |
392 | else: me.assertEqual(aad.hsz, None) | |
393 | me.assertEqual(aad.hlen, 0) | |
394 | aad.hash(h) | |
395 | m0 = dec.decrypt(c[0:156]) | |
396 | me.assertTrue(156 - aecls.bufsz <= len(m0) <= 156) | |
397 | m1 = dec.decrypt(c[156:]) | |
398 | me.assertTrue(len(c) - 156 - aecls.bufsz <= len(m1) <= | |
399 | len(c) - 156 + aecls.bufsz) | |
400 | m2 = dec.done(tag = t, aad = aad) | |
401 | me.assertEqual(m0 + m1 + m2, m) | |
402 | ||
403 | ## And again, with the wrong tag. | |
404 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
405 | aad = dec.aad(); aad.hash(h) | |
406 | _ = dec.decrypt(c) | |
407 | me.assertRaises(ValueError, dec.done, tag = t ^ tsz*C.bytes("55")) | |
408 | ||
409 | ## Check that the all-in-one methods work. | |
410 | me.assertEqual((c, t), | |
411 | key.encrypt(n = n, h = h, m = m, tsz = tsz)) | |
412 | me.assertEqual(m, | |
413 | key.decrypt(n = n, h = h, c = c, t = t)) | |
414 | ||
415 | ## Check that bad key, nonce, and tag lengths are rejected. | |
416 | badlen = bad_key_size(aecls.keysz) | |
417 | if badlen is not None: me.assertRaises(ValueError, aecls, T.span(badlen)) | |
418 | badlen = bad_key_size(aecls.noncesz) | |
419 | if badlen is not None: | |
420 | me.assertRaises(ValueError, key.enc, nonce = T.span(badlen), | |
421 | hsz = len(h), msz = len(m), tsz = tsz) | |
422 | me.assertRaises(ValueError, key.dec, nonce = T.span(badlen), | |
423 | hsz = len(h), csz = len(c), tsz = tsz) | |
424 | if not aecls.flags&C.AEADF_PCTSZ: | |
425 | enc = key.enc(nonce = n, hsz = 0, msz = len(m)) | |
426 | _ = enc.encrypt(m) | |
427 | me.assertRaises(ValueError, enc.done, tsz = badlen) | |
428 | badlen = bad_key_size(aecls.tagsz) | |
429 | if badlen is not None: | |
430 | me.assertRaises(ValueError, key.enc, nonce = n, | |
431 | hsz = len(h), msz = len(m), tsz = badlen) | |
432 | me.assertRaises(ValueError, key.dec, nonce = n, | |
433 | hsz = len(h), csz = len(c), tsz = badlen) | |
434 | ||
435 | ## Check that we can't get a loose `aad' object from a scheme which has | |
436 | ## nonce-dependent AAD processing. | |
437 | if aecls.flags&C.AEADF_AADNDEP: me.assertRaises(ValueError, key.aad) | |
438 | ||
439 | ## Check the menagerie of AAD hashing methods. | |
440 | if not aecls.flags&C.AEADF_NOAAD: | |
441 | def mkhash(hsz): | |
442 | enc = key.enc(nonce = n, hsz = hsz, msz = 0, tsz = tsz) | |
443 | aad = enc.aad() | |
444 | return aad, lambda: enc.done(aad = aad)[1] | |
445 | me.check_hashbuffer(mkhash) | |
446 | ||
447 | ## Check that encryption/decryption works with the given precommitments. | |
448 | def quick_enc_check(**kw): | |
449 | enc = key.enc(**kw) | |
450 | aad = enc.aad().hash(h) | |
451 | c0 = enc.encrypt(m); c1, tt = enc.done(aad = aad, tsz = tsz) | |
452 | me.assertEqual((c, t), (c0 + c1, tt)) | |
453 | def quick_dec_check(**kw): | |
454 | dec = key.dec(**kw) | |
455 | aad = dec.aad().hash(h) | |
456 | m0 = dec.decrypt(c); m1 = dec.done(aad = aad, tag = t) | |
457 | me.assertEqual(m, m0 + m1) | |
458 | ||
459 | ## Check that we can get away without precommitting to the header length | |
460 | ## if and only if the AEAD scheme says it will let us. | |
461 | if aecls.flags&C.AEADF_PCHSZ: | |
462 | me.assertRaises(ValueError, key.enc, nonce = n, | |
463 | msz = len(m), tsz = tsz) | |
464 | me.assertRaises(ValueError, key.dec, nonce = n, | |
465 | csz = len(c), tsz = tsz) | |
466 | else: | |
467 | quick_enc_check(nonce = n, msz = len(m), tsz = tsz) | |
468 | quick_dec_check(nonce = n, csz = len(c), tsz = tsz) | |
469 | ||
470 | ## Check that we can get away without precommitting to the message/ | |
471 | ## ciphertext length if and only if the AEAD scheme says it will let us. | |
472 | if aecls.flags&C.AEADF_PCMSZ: | |
473 | me.assertRaises(ValueError, key.enc, nonce = n, | |
474 | hsz = len(h), tsz = tsz) | |
475 | me.assertRaises(ValueError, key.dec, nonce = n, | |
476 | hsz = len(h), tsz = tsz) | |
477 | else: | |
478 | quick_enc_check(nonce = n, hsz = len(h), tsz = tsz) | |
479 | quick_dec_check(nonce = n, hsz = len(h), tsz = tsz) | |
480 | ||
481 | ## Check that we can get away without precommitting to the tag length if | |
482 | ## and only if the AEAD scheme says it will let us. | |
483 | if aecls.flags&C.AEADF_PCTSZ: | |
484 | me.assertRaises(ValueError, key.enc, nonce = n, | |
485 | hsz = len(h), msz = len(m)) | |
486 | me.assertRaises(ValueError, key.dec, nonce = n, | |
487 | hsz = len(h), csz = len(c)) | |
488 | else: | |
489 | quick_enc_check(nonce = n, hsz = len(h), msz = len(m)) | |
490 | quick_dec_check(nonce = n, hsz = len(h), csz = len(c)) | |
491 | ||
492 | ## Check that if we precommit to the header length, we're properly held | |
493 | ## to the commitment. | |
494 | if not aecls.flags&C.AEADF_NOAAD: | |
495 | ||
496 | ## First, check encryption with underrun. If we must supply AAD first, | |
497 | ## then the underrun will be reported when we start trying to encrypt; | |
498 | ## otherwise, checking is delayed until `done'. | |
499 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
500 | aad = enc.aad().hash(h[0:83]) | |
501 | if aecls.flags&C.AEADF_AADFIRST: | |
502 | me.assertRaises(ValueError, enc.encrypt, m) | |
503 | else: | |
504 | _ = enc.encrypt(m) | |
505 | me.assertRaises(ValueError, enc.done, aad = aad) | |
506 | ||
507 | ## Next, check decryption with underrun. If we must supply AAD first, | |
508 | ## then the underrun will be reported when we start trying to encrypt; | |
509 | ## otherwise, checking is delayed until `done'. | |
510 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
511 | aad = dec.aad().hash(h[0:83]) | |
512 | if aecls.flags&C.AEADF_AADFIRST: | |
513 | me.assertRaises(ValueError, dec.decrypt, c) | |
514 | else: | |
515 | _ = dec.decrypt(c) | |
516 | me.assertRaises(ValueError, dec.done, tag = t, aad = aad) | |
517 | ||
518 | ## If AAD processing is nonce-dependent then an overrun will be | |
519 | ## detected imediately. | |
520 | if aecls.flags&C.AEADF_AADNDEP: | |
521 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
522 | aad = enc.aad().hash(h[0:83]) | |
523 | me.assertRaises(ValueError, aad.hash, h[82:131]) | |
524 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz) | |
525 | aad = dec.aad().hash(h[0:83]) | |
526 | me.assertRaises(ValueError, aad.hash, h[82:131]) | |
527 | ||
528 | ## Some additional tests for nonce-dependent `aad' objects. | |
529 | if aecls.flags&C.AEADF_AADNDEP: | |
530 | ||
531 | ## Check that `aad' objects can't be used once their parents are gone. | |
532 | enc = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
533 | aad = enc.aad() | |
534 | del enc | |
535 | me.assertRaises(ValueError, aad.hash, h) | |
536 | ||
537 | ## Check that they can't be crossed over. | |
538 | enc0 = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
539 | enc1 = key.enc(nonce = n, hsz = len(h), msz = len(m), tsz = tsz) | |
540 | enc0.aad().hash(h) | |
541 | aad1 = enc1.aad().hash(h) | |
542 | _ = enc0.encrypt(m) | |
543 | me.assertRaises(ValueError, enc0.done, tsz = tsz, aad = aad1) | |
544 | ||
545 | ## Test copying AAD. | |
546 | if not aecls.flags&C.AEADF_AADNDEP and not aecls.flags&C.AEADF_NOAAD: | |
547 | aad0 = key.aad() | |
548 | aad0.hash(h[0:83]) | |
549 | aad1 = aad0.copy() | |
550 | aad2 = aad1.copy() | |
551 | aad0.hash(h[83:131]) | |
552 | aad1.hash(h[83:131]) | |
553 | aad2.hash(h[83:131] ^ 48*C.bytes("ff")) | |
554 | me.assertEqual(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 = aad1)) | |
558 | me.assertNotEqual(key.enc(nonce = n, hsz = len(h), | |
559 | msz = 0, tsz = tsz).done(aad = aad0), | |
560 | key.enc(nonce = n, hsz = len(h), | |
561 | msz = 0, tsz = tsz).done(aad = aad2)) | |
562 | ||
563 | ## Check that if we precommit to the message length, we're properly held | |
564 | ## to the commitment. (Fortunately, this is way simpler than the AAD | |
565 | ## case above.) First, try an underrun. | |
566 | enc = key.enc(nonce = n, hsz = 0, msz = len(m), tsz = tsz) | |
567 | _ = enc.encrypt(m[0:183]) | |
568 | me.assertRaises(ValueError, enc.done, tsz = tsz) | |
569 | dec = key.dec(nonce = n, hsz = 0, csz = len(c), tsz = tsz) | |
570 | _ = dec.decrypt(c[0:183]) | |
571 | me.assertRaises(ValueError, dec.done, tag = t) | |
572 | ||
573 | ## And now an overrun. | |
574 | enc = key.enc(nonce = n, hsz = 0, msz = 183, tsz = tsz) | |
575 | me.assertRaises(ValueError, enc.encrypt, m) | |
576 | dec = key.dec(nonce = n, hsz = 0, csz = 183, tsz = tsz) | |
577 | me.assertRaises(ValueError, dec.decrypt, c) | |
578 | ||
579 | ## Finally, check that if we precommit to a tag length, we're properly | |
580 | ## held to the commitment. This depends on being able to find a tag size | |
581 | ## which isn't the default. | |
582 | tsz1 = different_key_size(aecls.tagsz, tsz) | |
583 | if tsz1 is not None: | |
584 | enc = key.enc(nonce = n, hsz = 0, msz = len(m), tsz = tsz1) | |
585 | _ = enc.encrypt(m) | |
586 | me.assertRaises(ValueError, enc.done, tsz = tsz) | |
587 | dec = key.dec(nonce = n, hsz = len(h), csz = len(c), tsz = tsz1) | |
588 | aad = dec.aad().hash(h) | |
589 | _ = dec.decrypt(c) | |
590 | me.assertRaises(ValueError, enc.done, tsz = tsz, aad = aad) | |
591 | ||
592 | TestAuthenticatedEncryption.generate_testcases \ | |
593 | ((name, C.gcaeads[name]) for name in | |
594 | ["des3-ccm", "blowfish-ocb1", "square-ocb3", "rijndael-gcm", | |
595 | "serpent-eax", "salsa20-naclbox", "chacha20-poly1305"]) | |
596 | ||
597 | ###-------------------------------------------------------------------------- | |
ffad1322 MW |
598 | class BaseTestHash (HashBufferTestMixin): |
599 | """Base class for testing hash functions.""" | |
600 | ||
601 | def check_hash(me, hcls, need_bufsz = True): | |
602 | """ | |
603 | Check hash class HCLS. | |
604 | ||
5d04dade MW |
605 | If NEED_BUFSZ is false, then don't insist that HCLS has a working `bufsz' |
606 | attribute. This test is mostly reused for MACs, which don't have this | |
607 | attribute. | |
ffad1322 MW |
608 | """ |
609 | ## Check the class properties. | |
5d04dade MW |
610 | me.assertEqual(type(hcls.name), str) |
611 | if need_bufsz: me.assertEqual(type(hcls.bufsz), int) | |
612 | me.assertEqual(type(hcls.hashsz), int) | |
ffad1322 MW |
613 | |
614 | ## Set some initial values. | |
615 | m = T.span(131) | |
616 | h = hcls().hash(m).done() | |
617 | ||
618 | ## Check that hash length comes out right. | |
5d04dade | 619 | me.assertEqual(len(h), hcls.hashsz) |
ffad1322 MW |
620 | |
621 | ## Check that we get the same answer if we split the message up. | |
622 | me.assertEqual(h, hcls().hash(m[0:73]).hash(m[73:131]).done()) | |
623 | ||
624 | ## Check the `check' method. | |
625 | me.assertTrue(hcls().hash(m).check(h)) | |
5d04dade | 626 | me.assertFalse(hcls().hash(m).check(h ^ hcls.hashsz*C.bytes("aa"))) |
ffad1322 MW |
627 | |
628 | ## Check the menagerie of random hashing methods. | |
629 | def mkhash(_): | |
630 | h = hcls() | |
631 | return h, h.done | |
632 | me.check_hashbuffer(mkhash) | |
633 | ||
634 | class TestHash (BaseTestHash, T.GenericTestMixin): | |
635 | """Test hash functions.""" | |
636 | def _test_hash(me, hcls): me.check_hash(hcls, need_bufsz = True) | |
637 | ||
638 | TestHash.generate_testcases((name, C.gchashes[name]) for name in | |
639 | ["md5", "sha", "whirlpool", "sha256", "sha512/224", "sha3-384", "shake256", | |
640 | "crc32"]) | |
641 | ||
642 | ###-------------------------------------------------------------------------- | |
643 | class TestMessageAuthentication (BaseTestHash, T.GenericTestMixin): | |
644 | """Test message authentication codes.""" | |
645 | ||
646 | def _test_mac(me, mcls): | |
647 | ||
648 | ## Check the MAC properties. | |
649 | me.assertEqual(type(mcls.name), str) | |
650 | me.assertTrue(isinstance(mcls.keysz, C.KeySZ)) | |
651 | me.assertEqual(type(mcls.tagsz), int) | |
652 | ||
653 | ## Test hashing. | |
654 | k = T.span(mcls.keysz.default) | |
655 | key = mcls(k) | |
5d04dade | 656 | me.assertEqual(key.hashsz, key.tagsz) |
ffad1322 MW |
657 | me.check_hash(key, need_bufsz = False) |
658 | ||
659 | ## Check that bad key lengths are rejected. | |
660 | badlen = bad_key_size(mcls.keysz) | |
661 | if badlen is not None: me.assertRaises(ValueError, mcls, T.span(badlen)) | |
662 | ||
663 | TestMessageAuthentication.generate_testcases \ | |
664 | ((name, C.gcmacs[name]) for name in | |
665 | ["sha-hmac", "rijndael-cmac", "twofish-pmac1", "kmac128"]) | |
666 | ||
667 | class TestPoly1305 (HashBufferTestMixin): | |
668 | """Check the Poly1305 one-time message authentication function.""" | |
669 | ||
670 | def test_poly1305(me): | |
671 | ||
672 | ## Check the MAC properties. | |
673 | me.assertEqual(C.poly1305.name, "poly1305") | |
674 | me.assertEqual(type(C.poly1305.keysz), C.KeySZSet) | |
675 | me.assertEqual(C.poly1305.keysz.default, 16) | |
10011e42 | 676 | me.assertEqual(C.poly1305.keysz.set, set([16])) |
ffad1322 MW |
677 | me.assertEqual(C.poly1305.tagsz, 16) |
678 | me.assertEqual(C.poly1305.masksz, 16) | |
679 | ||
680 | ## Set some initial values. | |
681 | k = T.span(16) | |
682 | u = T.span(64)[-16:] | |
683 | m = T.span(149) | |
684 | key = C.poly1305(k) | |
685 | t = key(u).hash(m).done() | |
686 | ||
687 | ## Check the key properties. | |
5d04dade MW |
688 | me.assertEqual(key.name, "poly1305") |
689 | me.assertEqual(key.tagsz, 16) | |
690 | me.assertEqual(key.tagsz, 16) | |
ffad1322 MW |
691 | me.assertEqual(len(t), 16) |
692 | ||
693 | ## Check that we get the same answer if we split the message up. | |
694 | me.assertEqual(t, key(u).hash(m[0:86]).hash(m[86:149]).done()) | |
695 | ||
696 | ## Check the `check' method. | |
697 | me.assertTrue(key(u).hash(m).check(t)) | |
698 | me.assertFalse(key(u).hash(m).check(t ^ 16*C.bytes("cc"))) | |
699 | ||
700 | ## Check the menagerie of random hashing methods. | |
701 | def mkhash(_): | |
702 | h = key(u) | |
703 | return h, h.done | |
704 | me.check_hashbuffer(mkhash) | |
705 | ||
706 | ## Check that we can't complete hashing without a mask. | |
707 | me.assertRaises(ValueError, key().hash(m).done) | |
708 | ||
709 | ## Check `concat'. | |
710 | h0 = key().hash(m[0:96]) | |
711 | h1 = key().hash(m[96:117]) | |
712 | me.assertEqual(t, key(u).concat(h0, h1).hash(m[117:149]).done()) | |
713 | key1 = C.poly1305(k) | |
714 | me.assertRaises(TypeError, key().concat, key1().hash(m[0:96]), h1) | |
715 | me.assertRaises(TypeError, key().concat, h0, key1().hash(m[96:117])) | |
716 | me.assertRaises(ValueError, key().concat, key().hash(m[0:93]), h1) | |
717 | ||
718 | ###-------------------------------------------------------------------------- | |
719 | class TestHLatin (U.TestCase): | |
720 | """Test the `hsalsa20' and `hchacha20' functions.""" | |
721 | ||
722 | def test_hlatin(me): | |
8854283a | 723 | kk = [T.span(sz) for sz in [10, 16, 32]] |
ffad1322 MW |
724 | n = T.span(16) |
725 | bad_k = T.span(18) | |
726 | bad_n = T.span(13) | |
727 | for fn in [C.hsalsa208_prf, C.hsalsa2012_prf, C.hsalsa20_prf, | |
728 | C.hchacha8_prf, C.hchacha12_prf, C.hchacha20_prf]: | |
729 | for k in kk: | |
730 | h = fn(k, n) | |
731 | me.assertEqual(len(h), 32) | |
732 | me.assertRaises(ValueError, fn, bad_k, n) | |
733 | me.assertRaises(ValueError, fn, k, bad_n) | |
734 | ||
735 | ###-------------------------------------------------------------------------- | |
736 | class TestKeccak (HashBufferTestMixin): | |
737 | """Test the Keccak-p[1600, n] sponge function.""" | |
738 | ||
739 | def test_keccak(me): | |
740 | ||
741 | ## Make a state and feed some stuff into it. | |
742 | m0 = T.bin("some initial string") | |
743 | m1 = T.bin("awesome follow-up string") | |
744 | st0 = C.Keccak1600() | |
745 | me.assertEqual(st0.nround, 24) | |
746 | st0.mix(m0).step() | |
747 | ||
748 | ## Make another step with a different round count. | |
749 | st1 = C.Keccak1600(23) | |
750 | st1.mix(m0).step() | |
751 | me.assertNotEqual(st0.extract(32), st1.extract(32)) | |
752 | ||
f61394b9 MW |
753 | ## Check state copying. |
754 | st1 = st0.copy() | |
755 | mask = st1.extract(len(m1)) | |
756 | st0.mix(m1) | |
757 | st1.mix(m1) | |
758 | me.assertEqual(st0.extract(32), st1.extract(32)) | |
759 | ||
ffad1322 MW |
760 | ## Check error conditions. |
761 | _ = st0.extract(200) | |
762 | me.assertRaises(ValueError, st0.extract, 201) | |
763 | st0.mix(T.span(200)) | |
764 | me.assertRaises(ValueError, st0.mix, T.span(201)) | |
765 | ||
766 | def check_shake(me, xcls, c, done_matches_xof = True): | |
767 | """ | |
768 | Test the SHAKE and cSHAKE XOFs. | |
769 | ||
770 | This is also used for testing KMAC, but that sets DONE_MATCHES_XOF false | |
771 | to indicate that the XOF output is range-separated from the fixed-length | |
772 | outputs (unlike the basic SHAKE functions). | |
773 | """ | |
774 | ||
775 | ## Check the hash attributes. | |
776 | x = xcls() | |
777 | me.assertEqual(x.rate, 200 - c) | |
778 | me.assertEqual(x.buffered, 0) | |
779 | me.assertEqual(x.state, "absorb") | |
780 | ||
781 | ## Set some initial values. | |
782 | func = T.bin("TESTXOF") | |
783 | perso = T.bin("catacomb-python test") | |
784 | m = T.span(167) | |
785 | h0 = xcls().hash(m).done(193) | |
786 | me.assertEqual(len(h0), 193) | |
787 | h1 = xcls(func = func, perso = perso).hash(m).done(193) | |
788 | me.assertEqual(len(h1), 193) | |
789 | me.assertNotEqual(h0, h1) | |
790 | ||
791 | ## Check input and output in pieces, and the state machine. | |
792 | if done_matches_xof: h = h0 | |
793 | else: h = xcls().hash(m).xof().get(len(h0)) | |
794 | x = xcls().hash(m[0:76]).hash(m[76:167]).xof() | |
795 | me.assertEqual(h, x.get(98) + x.get(95)) | |
796 | ||
797 | ## Check masking. | |
798 | x = xcls().hash(m).xof() | |
5a5e2e11 | 799 | me.assertEqual(x.mask(m), m ^ h[0:len(m)]) |
ffad1322 MW |
800 | |
801 | ## Check the `check' method. | |
802 | me.assertTrue(xcls().hash(m).check(h0)) | |
803 | me.assertFalse(xcls().hash(m).check(h1)) | |
804 | ||
805 | ## Check the menagerie of random hashing methods. | |
806 | def mkhash(_): | |
807 | x = xcls(func = func, perso = perso) | |
7c342918 | 808 | return x, x.done |
ffad1322 MW |
809 | me.check_hashbuffer(mkhash) |
810 | ||
811 | ## Check the state machine tracking. | |
812 | x = xcls(); me.assertEqual(x.state, "absorb") | |
813 | x.hash(m); me.assertEqual(x.state, "absorb") | |
814 | xx = x.copy() | |
7c342918 | 815 | h = xx.done(); me.assertEqual(len(h), 100 - x.rate//2) |
ffad1322 MW |
816 | me.assertEqual(xx.state, "dead") |
817 | me.assertRaises(ValueError, xx.done, 1) | |
818 | me.assertRaises(ValueError, xx.get, 1) | |
819 | me.assertEqual(x.state, "absorb") | |
820 | me.assertRaises(ValueError, x.get, 1) | |
821 | x.xof(); me.assertEqual(x.state, "squeeze") | |
822 | me.assertRaises(ValueError, x.done, 1) | |
823 | _ = x.get(1) | |
824 | yy = x.copy(); me.assertEqual(yy.state, "squeeze") | |
825 | ||
826 | def test_shake128(me): me.check_shake(C.Shake128, 32) | |
827 | def test_shake256(me): me.check_shake(C.Shake256, 64) | |
828 | ||
829 | def check_kmac(me, mcls, c): | |
830 | k = T.span(32) | |
7ac8e86e | 831 | me.check_shake(lambda func = None, perso = None: |
ffad1322 MW |
832 | mcls(k, perso = perso), |
833 | c, done_matches_xof = False) | |
834 | ||
835 | def test_kmac128(me): me.check_kmac(C.KMAC128, 32) | |
836 | def test_kmac256(me): me.check_kmac(C.KMAC256, 64) | |
837 | ||
838 | ###-------------------------------------------------------------------------- | |
839 | class TestPRP (T.GenericTestMixin): | |
840 | """Test pseudorandom permutations (PRPs).""" | |
841 | ||
842 | def _test_prp(me, pcls): | |
843 | ||
844 | ## Check the PRP properties. | |
845 | me.assertEqual(type(pcls.name), str) | |
846 | me.assertTrue(isinstance(pcls.keysz, C.KeySZ)) | |
847 | me.assertEqual(type(pcls.blksz), int) | |
848 | ||
849 | ## Check round-tripping. | |
850 | k = T.span(pcls.keysz.default) | |
851 | key = pcls(k) | |
852 | m = T.span(pcls.blksz) | |
853 | c = key.encrypt(m) | |
854 | me.assertEqual(len(c), pcls.blksz) | |
855 | me.assertEqual(m, key.decrypt(c)) | |
856 | ||
857 | ## Check that bad key lengths are rejected. | |
858 | badlen = bad_key_size(pcls.keysz) | |
859 | if badlen is not None: me.assertRaises(ValueError, pcls, T.span(badlen)) | |
860 | ||
861 | ## Check that bad blocks are rejected. | |
862 | badblk = T.span(pcls.blksz + 1) | |
863 | me.assertRaises(ValueError, key.encrypt, badblk) | |
864 | me.assertRaises(ValueError, key.decrypt, badblk) | |
865 | ||
866 | TestPRP.generate_testcases((name, C.gcprps[name]) for name in | |
867 | ["desx", "blowfish", "rijndael"]) | |
868 | ||
869 | ###----- That's all, folks -------------------------------------------------- | |
870 | ||
871 | if __name__ == "__main__": U.main() |