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# ===================================================================
#
# Copyright (c) 2016, Legrandin <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# ===================================================================
import os
import re
import json
import errno
import binascii
import warnings
from binascii import unhexlify
from Crypto.Util.py3compat import FileNotFoundError
try:
import pycryptodome_test_vectors # type: ignore
test_vectors_available = True
except ImportError:
test_vectors_available = False
def _load_tests(dir_comps, file_in, description, conversions):
"""Load and parse a test vector file
Return a list of objects, one per group of adjacent
KV lines or for a single line in the form "[.*]".
For a group of lines, the object has one attribute per line.
"""
line_number = 0
results = []
class TestVector(object):
def __init__(self, description, count):
self.desc = description
self.count = count
self.others = []
test_vector = None
count = 0
new_group = True
while True:
line_number += 1
line = file_in.readline()
if not line:
if test_vector is not None:
results.append(test_vector)
break
line = line.strip()
# Skip comments and empty lines
if line.startswith('#') or not line:
new_group = True
continue
if line.startswith("["):
if test_vector is not None:
results.append(test_vector)
test_vector = None
results.append(line)
continue
if new_group:
count += 1
new_group = False
if test_vector is not None:
results.append(test_vector)
test_vector = TestVector("%s (#%d)" % (description, count), count)
res = re.match("([A-Za-z0-9]+) = ?(.*)", line)
if not res:
test_vector.others += [line]
else:
token = res.group(1).lower()
data = res.group(2).lower()
conversion = conversions.get(token, None)
if conversion is None:
if len(data) % 2 != 0:
data = "0" + data
setattr(test_vector, token, binascii.unhexlify(data))
else:
setattr(test_vector, token, conversion(data))
# This line is ignored
return results
def load_test_vectors(dir_comps, file_name, description, conversions):
"""Load and parse a test vector file, formatted using the NIST style.
Args:
dir_comps (list of strings):
The path components under the ``pycryptodome_test_vectors`` package.
For instance ``("Cipher", "AES")``.
file_name (string):
The name of the file with the test vectors.
description (string):
A description applicable to the test vectors in the file.
conversions (dictionary):
The dictionary contains functions.
Values in the file that have an entry in this dictionary
will be converted usign the matching function.
Otherwise, values will be considered as hexadecimal and
converted to binary.
Returns:
A list of test vector objects.
The file is formatted in the following way:
- Lines starting with "#" are comments and will be ignored.
- Each test vector is a sequence of 1 or more adjacent lines, where
each lines is an assignement.
- Test vectors are separated by an empty line, a comment, or
a line starting with "[".
A test vector object has the following attributes:
- desc (string): description
- counter (int): the order of the test vector in the file (from 1)
- others (list): zero or more lines of the test vector that were not assignments
- left-hand side of each assignment (lowercase): the value of the
assignement, either converted or bytes.
"""
results = None
try:
if not test_vectors_available:
raise FileNotFoundError(errno.ENOENT,
os.strerror(errno.ENOENT),
file_name)
description = "%s test (%s)" % (description, file_name)
init_dir = os.path.dirname(pycryptodome_test_vectors.__file__)
full_file_name = os.path.join(os.path.join(init_dir, *dir_comps), file_name)
with open(full_file_name) as file_in:
results = _load_tests(dir_comps, file_in, description, conversions)
except FileNotFoundError:
warnings.warn("Warning: skipping extended tests for " + description,
UserWarning,
stacklevel=2)
return results
def load_test_vectors_wycheproof(dir_comps, file_name, description,
root_tag={}, group_tag={}, unit_tag={}):
result = []
try:
if not test_vectors_available:
raise FileNotFoundError(errno.ENOENT,
os.strerror(errno.ENOENT),
file_name)
init_dir = os.path.dirname(pycryptodome_test_vectors.__file__)
full_file_name = os.path.join(os.path.join(init_dir, *dir_comps), file_name)
with open(full_file_name) as file_in:
tv_tree = json.load(file_in)
except FileNotFoundError:
warnings.warn("Warning: skipping extended tests for " + description,
UserWarning,
stacklevel=2)
return result
class TestVector(object):
pass
common_root = {}
for k, v in root_tag.items():
common_root[k] = v(tv_tree)
for group in tv_tree['testGroups']:
common_group = {}
for k, v in group_tag.items():
common_group[k] = v(group)
for test in group['tests']:
tv = TestVector()
for k, v in common_root.items():
setattr(tv, k, v)
for k, v in common_group.items():
setattr(tv, k, v)
tv.id = test['tcId']
tv.comment = test['comment']
for attr in 'key', 'iv', 'aad', 'msg', 'ct', 'tag', 'label', 'ikm', 'salt', 'info', 'okm', 'sig':
if attr in test:
setattr(tv, attr, unhexlify(test[attr]))
tv.filename = file_name
for k, v in unit_tag.items():
setattr(tv, k, v(test))
tv.valid = test['result'] != "invalid"
tv.warning = test['result'] == "acceptable"
result.append(tv)
return result