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# 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.
import collections
import os
import pytest
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")
def load_vectors_from_file(filename, loader):
base = os.path.join(
os.path.dirname(__file__), "hazmat", "primitives", "vectors",
)
with open(os.path.join(base, filename), "r") 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_openssl_vectors(vector_data):
vectors = []
for line in vector_data:
line = line.strip()
# Blank lines and comments are ignored
if not line or line.startswith("#"):
continue
vector = line.split(":")
vectors.append({
"key": vector[1].encode("ascii"),
"iv": vector[2].encode("ascii"),
"plaintext": vector[3].encode("ascii"),
"ciphertext": vector[4].encode("ascii"),
})
return vectors
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
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