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lib/Crypto/SelfTest/loader.py
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206
lib/Crypto/SelfTest/loader.py
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# ===================================================================
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#
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# Copyright (c) 2016, Legrandin <helderijs@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ===================================================================
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import os
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import re
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import json
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import errno
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import binascii
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import warnings
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from binascii import unhexlify
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from Crypto.Util.py3compat import FileNotFoundError
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try:
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import pycryptodome_test_vectors # type: ignore
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test_vectors_available = True
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except ImportError:
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test_vectors_available = False
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def _load_tests(dir_comps, file_in, description, conversions):
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"""Load and parse a test vector file
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Return a list of objects, one per group of adjacent
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KV lines or for a single line in the form "[.*]".
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For a group of lines, the object has one attribute per line.
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"""
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line_number = 0
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results = []
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class TestVector(object):
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def __init__(self, description, count):
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self.desc = description
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self.count = count
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self.others = []
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test_vector = None
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count = 0
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new_group = True
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while True:
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line_number += 1
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line = file_in.readline()
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if not line:
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if test_vector is not None:
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results.append(test_vector)
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break
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line = line.strip()
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# Skip comments and empty lines
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if line.startswith('#') or not line:
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new_group = True
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continue
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if line.startswith("["):
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if test_vector is not None:
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results.append(test_vector)
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test_vector = None
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results.append(line)
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continue
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if new_group:
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count += 1
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new_group = False
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if test_vector is not None:
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results.append(test_vector)
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test_vector = TestVector("%s (#%d)" % (description, count), count)
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res = re.match("([A-Za-z0-9]+) = ?(.*)", line)
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if not res:
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test_vector.others += [line]
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else:
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token = res.group(1).lower()
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data = res.group(2).lower()
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conversion = conversions.get(token, None)
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if conversion is None:
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if len(data) % 2 != 0:
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data = "0" + data
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setattr(test_vector, token, binascii.unhexlify(data))
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else:
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setattr(test_vector, token, conversion(data))
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# This line is ignored
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return results
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def load_test_vectors(dir_comps, file_name, description, conversions):
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"""Load and parse a test vector file
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This function returns a list of objects, one per group of adjacent
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KV lines or for a single line in the form "[.*]".
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For a group of lines, the object has one attribute per line.
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"""
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results = None
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try:
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if not test_vectors_available:
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raise FileNotFoundError(errno.ENOENT,
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os.strerror(errno.ENOENT),
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file_name)
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description = "%s test (%s)" % (description, file_name)
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init_dir = os.path.dirname(pycryptodome_test_vectors.__file__)
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full_file_name = os.path.join(os.path.join(init_dir, *dir_comps), file_name)
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with open(full_file_name) as file_in:
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results = _load_tests(dir_comps, file_in, description, conversions)
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except FileNotFoundError:
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warnings.warn("Warning: skipping extended tests for " + description,
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UserWarning,
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stacklevel=2)
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return results
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def load_test_vectors_wycheproof(dir_comps, file_name, description,
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root_tag={}, group_tag={}, unit_tag={}):
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result = []
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try:
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if not test_vectors_available:
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raise FileNotFoundError(errno.ENOENT,
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os.strerror(errno.ENOENT),
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file_name)
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init_dir = os.path.dirname(pycryptodome_test_vectors.__file__)
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full_file_name = os.path.join(os.path.join(init_dir, *dir_comps), file_name)
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with open(full_file_name) as file_in:
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tv_tree = json.load(file_in)
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except FileNotFoundError:
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warnings.warn("Warning: skipping extended tests for " + description,
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UserWarning,
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stacklevel=2)
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return result
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class TestVector(object):
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pass
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common_root = {}
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for k, v in root_tag.items():
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common_root[k] = v(tv_tree)
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for group in tv_tree['testGroups']:
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common_group = {}
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for k, v in group_tag.items():
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common_group[k] = v(group)
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for test in group['tests']:
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tv = TestVector()
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for k, v in common_root.items():
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setattr(tv, k, v)
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for k, v in common_group.items():
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setattr(tv, k, v)
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tv.id = test['tcId']
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tv.comment = test['comment']
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for attr in 'key', 'iv', 'aad', 'msg', 'ct', 'tag', 'label', 'ikm', 'salt', 'info', 'okm', 'sig':
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if attr in test:
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setattr(tv, attr, unhexlify(test[attr]))
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tv.filename = file_name
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for k, v in unit_tag.items():
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setattr(tv, k, v(test))
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tv.valid = test['result'] != "invalid"
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tv.warning = test['result'] == "acceptable"
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result.append(tv)
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return result
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