aboutsummaryrefslogtreecommitdiffstats
path: root/tests/utils.py
blob: 6ee735a1fdf10acfcd73bafeec11860e89239fea (plain)
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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import absolute_import, division, print_function

import collections
from contextlib import contextmanager

import pytest

import six

from cryptography.exceptions import UnsupportedAlgorithm

import cryptography_vectors


HashVector = collections.namedtuple("HashVector", ["message", "digest"])
KeyedHashVector = collections.namedtuple(
    "KeyedHashVector", ["message", "digest", "key"]
)


def select_backends(names, backend_list):
    if names is None:
        return backend_list
    split_names = [x.strip() for x in names.split(',')]
    # this must be duplicated and then removed to preserve the metadata
    # pytest associates. Appending backends to a new list doesn't seem to work
    selected_backends = []
    for backend in backend_list:
        if backend.name in split_names:
            selected_backends.append(backend)

    if len(selected_backends) > 0:
        return selected_backends
    else:
        raise ValueError(
            "No backend selected. Tried to select: {0}".format(split_names)
        )


def check_for_iface(name, iface, item):
    if name in item.keywords and "backend" in item.funcargs:
        if not isinstance(item.funcargs["backend"], iface):
            pytest.skip("{0} backend does not support {1}".format(
                item.funcargs["backend"], name
            ))


def check_backend_support(item):
    supported = item.keywords.get("supported")
    if supported and "backend" in item.funcargs:
        if not supported.kwargs["only_if"](item.funcargs["backend"]):
            pytest.skip("{0} ({1})".format(
                supported.kwargs["skip_message"], item.funcargs["backend"]
            ))
    elif supported:
        raise ValueError("This mark is only available on methods that take a "
                         "backend")


@contextmanager
def raises_unsupported_algorithm(reason):
    with pytest.raises(UnsupportedAlgorithm) as exc_info:
        yield exc_info

    assert exc_info.value._reason is reason


def load_vectors_from_file(filename, loader):
    with cryptography_vectors.open_vector_file(filename) as vector_file:
        return loader(vector_file)


def load_nist_vectors(vector_data):
    test_data = None
    data = []

    for line in vector_data:
        line = line.strip()

        # Blank lines, comments, and section headers are ignored
        if not line or line.startswith("#") or (line.startswith("[")
                                                and line.endswith("]")):
            continue

        if line.strip() == "FAIL":
            test_data["fail"] = True
            continue

        # Build our data using a simple Key = Value format
        name, value = [c.strip() for c in line.split("=")]

        # Some tests (PBKDF2) contain \0, which should be interpreted as a
        # null character rather than literal.
        value = value.replace("\\0", "\0")

        # COUNT is a special token that indicates a new block of data
        if name.upper() == "COUNT":
            test_data = {}
            data.append(test_data)
            continue
        # For all other tokens we simply want the name, value stored in
        # the dictionary
        else:
            test_data[name.lower()] = value.encode("ascii")

    return data


def load_cryptrec_vectors(vector_data):
    cryptrec_list = []

    for line in vector_data:
        line = line.strip()

        # Blank lines and comments are ignored
        if not line or line.startswith("#"):
            continue

        if line.startswith("K"):
            key = line.split(" : ")[1].replace(" ", "").encode("ascii")
        elif line.startswith("P"):
            pt = line.split(" : ")[1].replace(" ", "").encode("ascii")
        elif line.startswith("C"):
            ct = line.split(" : ")[1].replace(" ", "").encode("ascii")
            # after a C is found the K+P+C tuple is complete
            # there are many P+C pairs for each K
            cryptrec_list.append({
                "key": key,
                "plaintext": pt,
                "ciphertext": ct
            })
        else:
            raise ValueError("Invalid line in file '{}'".format(line))
    return cryptrec_list


def load_hash_vectors(vector_data):
    vectors = []
    key = None
    msg = None
    md = None

    for line in vector_data:
        line = line.strip()

        if not line or line.startswith("#") or line.startswith("["):
            continue

        if line.startswith("Len"):
            length = int(line.split(" = ")[1])
        elif line.startswith("Key"):
            # HMAC vectors contain a key attribute. Hash vectors do not.
            key = line.split(" = ")[1].encode("ascii")
        elif line.startswith("Msg"):
            # In the NIST vectors they have chosen to represent an empty
            # string as hex 00, which is of course not actually an empty
            # string. So we parse the provided length and catch this edge case.
            msg = line.split(" = ")[1].encode("ascii") if length > 0 else b""
        elif line.startswith("MD"):
            md = line.split(" = ")[1]
            # after MD is found the Msg+MD (+ potential key) tuple is complete
            if key is not None:
                vectors.append(KeyedHashVector(msg, md, key))
                key = None
                msg = None
                md = None
            else:
                vectors.append(HashVector(msg, md))
                msg = None
                md = None
        else:
            raise ValueError("Unknown line in hash vector")
    return vectors


def load_pkcs1_vectors(vector_data):
    """
    Loads data out of RSA PKCS #1 vector files.
    """
    private_key_vector = None
    public_key_vector = None
    attr = None
    key = None
    example_vector = None
    examples = []
    vectors = []
    for line in vector_data:
        if (
            line.startswith("# PSS Example") or
            line.startswith("# OAEP Example") or
            line.startswith("# PKCS#1 v1.5")
        ):
            if example_vector:
                for key, value in six.iteritems(example_vector):
                    hex_str = "".join(value).replace(" ", "").encode("ascii")
                    example_vector[key] = hex_str
                examples.append(example_vector)

            attr = None
            example_vector = collections.defaultdict(list)

        if line.startswith("# Message"):
            attr = "message"
            continue
        elif line.startswith("# Salt"):
            attr = "salt"
            continue
        elif line.startswith("# Seed"):
            attr = "seed"
            continue
        elif line.startswith("# Signature"):
            attr = "signature"
            continue
        elif line.startswith("# Encryption"):
            attr = "encryption"
            continue
        elif (
            example_vector and
            line.startswith("# =============================================")
        ):
            for key, value in six.iteritems(example_vector):
                hex_str = "".join(value).replace(" ", "").encode("ascii")
                example_vector[key] = hex_str
            examples.append(example_vector)
            example_vector = None
            attr = None
        elif example_vector and line.startswith("#"):
            continue
        else:
            if attr is not None and example_vector is not None:
                example_vector[attr].append(line.strip())
                continue

        if (
            line.startswith("# Example") or
            line.startswith("# =============================================")
        ):
            if key:
                assert private_key_vector
                assert public_key_vector

                for key, value in six.iteritems(public_key_vector):
                    hex_str = "".join(value).replace(" ", "")
                    public_key_vector[key] = int(hex_str, 16)

                for key, value in six.iteritems(private_key_vector):
                    hex_str = "".join(value).replace(" ", "")
                    private_key_vector[key] = int(hex_str, 16)

                private_key_vector["examples"] = examples
                examples = []

                assert (
                    private_key_vector['public_exponent'] ==
                    public_key_vector['public_exponent']
                )

                assert (
                    private_key_vector['modulus'] ==
                    public_key_vector['modulus']
                )

                vectors.append(
                    (private_key_vector, public_key_vector)
                )

            public_key_vector = collections.defaultdict(list)
            private_key_vector = collections.defaultdict(list)
            key = None
            attr = None

        if private_key_vector is None or public_key_vector is None:
            continue

        if line.startswith("# Private key"):
            key = private_key_vector
        elif line.startswith("# Public key"):
            key = public_key_vector
        elif line.startswith("# Modulus:"):
            attr = "modulus"
        elif line.startswith("# Public exponent:"):
            attr = "public_exponent"
        elif line.startswith("# Exponent:"):
            if key is public_key_vector:
                attr = "public_exponent"
            else:
                assert key is private_key_vector
                attr = "private_exponent"
        elif line.startswith("# Prime 1:"):
            attr = "p"
        elif line.startswith("# Prime 2:"):
            attr = "q"
        elif line.startswith("# Prime exponent 1:"):
            attr = "dmp1"
        elif line.startswith("# Prime exponent 2:"):
            attr = "dmq1"
        elif line.startswith("# Coefficient:"):
            attr = "iqmp"
        elif line.startswith("#"):
            attr = None
        else:
            if key is not None and attr is not None:
                key[attr].append(line.strip())
    return vectors


def load_rsa_nist_vectors(vector_data):
    test_data = None
    p = None
    salt_length = None
    data = []

    for line in vector_data:
        line = line.strip()

        # Blank lines and section headers are ignored
        if not line or line.startswith("["):
            continue

        if line.startswith("# Salt len:"):
            salt_length = int(line.split(":")[1].strip())
            continue
        elif line.startswith("#"):
            continue

        # Build our data using a simple Key = Value format
        name, value = [c.strip() for c in line.split("=")]

        if name == "n":
            n = int(value, 16)
        elif name == "e" and p is None:
            e = int(value, 16)
        elif name == "p":
            p = int(value, 16)
        elif name == "q":
            q = int(value, 16)
        elif name == "SHAAlg":
            if p is None:
                test_data = {
                    "modulus": n,
                    "public_exponent": e,
                    "salt_length": salt_length,
                    "algorithm": value,
                    "fail": False
                }
            else:
                test_data = {
                    "modulus": n,
                    "p": p,
                    "q": q,
                    "algorithm": value
                }
                if salt_length is not None:
                    test_data["salt_length"] = salt_length
            data.append(test_data)
        elif name == "e" and p is not None:
            test_data["public_exponent"] = int(value, 16)
        elif name == "d":
            test_data["private_exponent"] = int(value, 16)
        elif name == "Result":
            test_data["fail"] = value.startswith("F")
        # For all other tokens we simply want the name, value stored in
        # the dictionary
        else:
            test_data[name.lower()] = value.encode("ascii")

    return data


def load_fips_dsa_key_pair_vectors(vector_data):
    """
    Loads data out of the FIPS DSA KeyPair vector files.
    """
    vectors = []
    # When reading_key_data is set to True it tells the loader to continue
    # constructing dictionaries. We set reading_key_data to False during the
    # blocks of the vectors of N=224 because we don't support it.
    reading_key_data = True
    for line in vector_data:
        line = line.strip()

        if not line or line.startswith("#"):
            continue
        elif line.startswith("[mod = L=1024"):
            continue
        elif line.startswith("[mod = L=2048, N=224"):
            reading_key_data = False
            continue
        elif line.startswith("[mod = L=2048, N=256"):
            reading_key_data = True
            continue
        elif line.startswith("[mod = L=3072"):
            continue

        if not reading_key_data:
            continue

        elif reading_key_data:
            if line.startswith("P"):
                vectors.append({'p': int(line.split("=")[1], 16)})
            elif line.startswith("Q"):
                vectors[-1]['q'] = int(line.split("=")[1], 16)
            elif line.startswith("G"):
                vectors[-1]['g'] = int(line.split("=")[1], 16)
            elif line.startswith("X") and 'x' not in vectors[-1]:
                vectors[-1]['x'] = int(line.split("=")[1], 16)
            elif line.startswith("X") and 'x' in vectors[-1]:
                vectors.append({'p': vectors[-1]['p'],
                                'q': vectors[-1]['q'],
                                'g': vectors[-1]['g'],
                                'x': int(line.split("=")[1], 16)
                                })
            elif line.startswith("Y"):
                vectors[-1]['y'] = int(line.split("=")[1], 16)

    return vectors