1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
|
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import binascii
import os
import cffi
import pytest
from cryptography.exceptions import AlreadyFinalized, _Reasons
from cryptography.hazmat.backends.interfaces import CipherBackend
from cryptography.hazmat.primitives import ciphers
from cryptography.hazmat.primitives.ciphers import modes
from cryptography.hazmat.primitives.ciphers.algorithms import (
AES, ARC4, Blowfish, CAST5, Camellia, IDEA, SEED, TripleDES
)
from ...utils import (
load_nist_vectors, load_vectors_from_file, raises_unsupported_algorithm
)
class TestAES(object):
@pytest.mark.parametrize(("key", "keysize"), [
(b"0" * 32, 128),
(b"0" * 48, 192),
(b"0" * 64, 256),
])
def test_key_size(self, key, keysize):
cipher = AES(binascii.unhexlify(key))
assert cipher.key_size == keysize
def test_invalid_key_size(self):
with pytest.raises(ValueError):
AES(binascii.unhexlify(b"0" * 12))
class TestCamellia(object):
@pytest.mark.parametrize(("key", "keysize"), [
(b"0" * 32, 128),
(b"0" * 48, 192),
(b"0" * 64, 256),
])
def test_key_size(self, key, keysize):
cipher = Camellia(binascii.unhexlify(key))
assert cipher.key_size == keysize
def test_invalid_key_size(self):
with pytest.raises(ValueError):
Camellia(binascii.unhexlify(b"0" * 12))
class TestTripleDES(object):
@pytest.mark.parametrize("key", [
b"0" * 16,
b"0" * 32,
b"0" * 48,
])
def test_key_size(self, key):
cipher = TripleDES(binascii.unhexlify(key))
assert cipher.key_size == 192
def test_invalid_key_size(self):
with pytest.raises(ValueError):
TripleDES(binascii.unhexlify(b"0" * 12))
class TestBlowfish(object):
@pytest.mark.parametrize(("key", "keysize"), [
(b"0" * (keysize // 4), keysize) for keysize in range(32, 449, 8)
])
def test_key_size(self, key, keysize):
cipher = Blowfish(binascii.unhexlify(key))
assert cipher.key_size == keysize
def test_invalid_key_size(self):
with pytest.raises(ValueError):
Blowfish(binascii.unhexlify(b"0" * 6))
class TestCAST5(object):
@pytest.mark.parametrize(("key", "keysize"), [
(b"0" * (keysize // 4), keysize) for keysize in range(40, 129, 8)
])
def test_key_size(self, key, keysize):
cipher = CAST5(binascii.unhexlify(key))
assert cipher.key_size == keysize
def test_invalid_key_size(self):
with pytest.raises(ValueError):
CAST5(binascii.unhexlify(b"0" * 34))
class TestARC4(object):
@pytest.mark.parametrize(("key", "keysize"), [
(b"0" * 10, 40),
(b"0" * 14, 56),
(b"0" * 16, 64),
(b"0" * 20, 80),
(b"0" * 32, 128),
(b"0" * 48, 192),
(b"0" * 64, 256),
])
def test_key_size(self, key, keysize):
cipher = ARC4(binascii.unhexlify(key))
assert cipher.key_size == keysize
def test_invalid_key_size(self):
with pytest.raises(ValueError):
ARC4(binascii.unhexlify(b"0" * 34))
class TestIDEA(object):
def test_key_size(self):
cipher = IDEA(b"\x00" * 16)
assert cipher.key_size == 128
def test_invalid_key_size(self):
with pytest.raises(ValueError):
IDEA(b"\x00" * 17)
class TestSEED(object):
def test_key_size(self):
cipher = SEED(b"\x00" * 16)
assert cipher.key_size == 128
def test_invalid_key_size(self):
with pytest.raises(ValueError):
SEED(b"\x00" * 17)
def test_invalid_backend():
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
ciphers.Cipher(AES(b"AAAAAAAAAAAAAAAA"), modes.ECB, pretend_backend)
@pytest.mark.skipif(
cffi.__version_info__ < (1, 7),
reason="cffi version too old"
)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.ECB()
),
skip_message="Does not support AES ECB",
)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
class TestCipherUpdateInto(object):
@pytest.mark.parametrize(
"params",
load_vectors_from_file(
os.path.join("ciphers", "AES", "ECB", "ECBGFSbox128.rsp"),
load_nist_vectors
)
)
def test_update_into(self, params, backend):
key = binascii.unhexlify(params["key"])
pt = binascii.unhexlify(params["plaintext"])
ct = binascii.unhexlify(params["ciphertext"])
c = ciphers.Cipher(AES(key), modes.ECB(), backend)
encryptor = c.encryptor()
buf = bytearray(len(pt) + 15)
res = encryptor.update_into(pt, buf)
assert res == len(pt)
assert bytes(buf)[:res] == ct
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.GCM(b"0" * 12)
),
skip_message="Does not support AES GCM",
)
def test_update_into_gcm(self, backend):
key = binascii.unhexlify(b"e98b72a9881a84ca6b76e0f43e68647a")
iv = binascii.unhexlify(b"8b23299fde174053f3d652ba")
ct = binascii.unhexlify(b"5a3c1cf1985dbb8bed818036fdd5ab42")
pt = binascii.unhexlify(b"28286a321293253c3e0aa2704a278032")
c = ciphers.Cipher(AES(key), modes.GCM(iv), backend)
encryptor = c.encryptor()
buf = bytearray(len(pt) + 15)
res = encryptor.update_into(pt, buf)
assert res == len(pt)
assert bytes(buf)[:res] == ct
encryptor.finalize()
c = ciphers.Cipher(AES(key), modes.GCM(iv, encryptor.tag), backend)
decryptor = c.decryptor()
res = decryptor.update_into(ct, buf)
decryptor.finalize()
assert res == len(pt)
assert bytes(buf)[:res] == pt
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.GCM(b"0" * 12)
),
skip_message="Does not support AES GCM",
)
def test_finalize_with_tag_already_finalized(self, backend):
key = binascii.unhexlify(b"e98b72a9881a84ca6b76e0f43e68647a")
iv = binascii.unhexlify(b"8b23299fde174053f3d652ba")
encryptor = ciphers.Cipher(
AES(key), modes.GCM(iv), backend
).encryptor()
ciphertext = encryptor.update(b"abc") + encryptor.finalize()
decryptor = ciphers.Cipher(
AES(key), modes.GCM(iv, tag=encryptor.tag), backend
).decryptor()
decryptor.update(ciphertext)
decryptor.finalize()
with pytest.raises(AlreadyFinalized):
decryptor.finalize_with_tag(encryptor.tag)
@pytest.mark.parametrize(
"params",
load_vectors_from_file(
os.path.join("ciphers", "AES", "ECB", "ECBGFSbox128.rsp"),
load_nist_vectors
)
)
def test_update_into_multiple_calls(self, params, backend):
key = binascii.unhexlify(params["key"])
pt = binascii.unhexlify(params["plaintext"])
ct = binascii.unhexlify(params["ciphertext"])
c = ciphers.Cipher(AES(key), modes.ECB(), backend)
encryptor = c.encryptor()
buf = bytearray(len(pt) + 15)
res = encryptor.update_into(pt[:3], buf)
assert res == 0
res = encryptor.update_into(pt[3:], buf)
assert res == len(pt)
assert bytes(buf)[:res] == ct
def test_update_into_buffer_too_small(self, backend):
key = b"\x00" * 16
c = ciphers.Cipher(AES(key), modes.ECB(), backend)
encryptor = c.encryptor()
buf = bytearray(16)
with pytest.raises(ValueError):
encryptor.update_into(b"testing", buf)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.GCM(b"\x00" * 12)
),
skip_message="Does not support AES GCM",
)
def test_update_into_buffer_too_small_gcm(self, backend):
key = b"\x00" * 16
c = ciphers.Cipher(AES(key), modes.GCM(b"\x00" * 12), backend)
encryptor = c.encryptor()
buf = bytearray(5)
with pytest.raises(ValueError):
encryptor.update_into(b"testing", buf)
@pytest.mark.skipif(
cffi.__version_info__ >= (1, 7),
reason="cffi version too new"
)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
class TestCipherUpdateIntoUnsupported(object):
def _too_old(self, mode, backend):
key = b"\x00" * 16
c = ciphers.Cipher(AES(key), mode, backend)
encryptor = c.encryptor()
buf = bytearray(32)
with pytest.raises(NotImplementedError):
encryptor.update_into(b"\x00" * 16, buf)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.ECB()
),
skip_message="Does not support AES ECB",
)
def test_cffi_too_old_ecb(self, backend):
self._too_old(modes.ECB(), backend)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.CTR(b"0" * 16)
),
skip_message="Does not support AES CTR",
)
def test_cffi_too_old_ctr(self, backend):
self._too_old(modes.CTR(b"0" * 16), backend)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
AES(b"\x00" * 16), modes.GCM(b"0" * 16)
),
skip_message="Does not support AES GCM",
)
def test_cffi_too_old_gcm(self, backend):
self._too_old(modes.GCM(b"0" * 16), backend)
|
