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# Copyright 2016 Google Inc.
#
# 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 base64
import json
import os
from cryptography.hazmat.primitives.asymmetric import ec
import pytest
from google.auth import _helpers
from google.auth.crypt import base
from google.auth.crypt import es256
DATA_DIR = os.path.join(os.path.dirname(__file__), "..", "data")
# To generate es256_privatekey.pem, es256_privatekey.pub, and
# es256_public_cert.pem:
# $ openssl ecparam -genkey -name prime256v1 -noout -out es256_privatekey.pem
# $ openssl ec -in es256-private-key.pem -pubout -out es256-publickey.pem
# $ openssl req -new -x509 -key es256_privatekey.pem -out \
# > es256_public_cert.pem
with open(os.path.join(DATA_DIR, "es256_privatekey.pem"), "rb") as fh:
PRIVATE_KEY_BYTES = fh.read()
PKCS1_KEY_BYTES = PRIVATE_KEY_BYTES
with open(os.path.join(DATA_DIR, "es256_publickey.pem"), "rb") as fh:
PUBLIC_KEY_BYTES = fh.read()
with open(os.path.join(DATA_DIR, "es256_public_cert.pem"), "rb") as fh:
PUBLIC_CERT_BYTES = fh.read()
SERVICE_ACCOUNT_JSON_FILE = os.path.join(DATA_DIR, "es256_service_account.json")
with open(SERVICE_ACCOUNT_JSON_FILE, "r") as fh:
SERVICE_ACCOUNT_INFO = json.load(fh)
class TestES256Verifier(object):
def test_verify_bytes_success(self):
to_sign = b"foo"
signer = es256.ES256Signer.from_string(PRIVATE_KEY_BYTES)
actual_signature = signer.sign(to_sign)
verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
assert verifier.verify(to_sign, actual_signature)
def test_verify_text_success(self):
to_sign = "foo"
signer = es256.ES256Signer.from_string(PRIVATE_KEY_BYTES)
actual_signature = signer.sign(to_sign)
verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
assert verifier.verify(to_sign, actual_signature)
def test_verify_failure(self):
verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
bad_signature1 = b""
assert not verifier.verify(b"foo", bad_signature1)
bad_signature2 = b"a"
assert not verifier.verify(b"foo", bad_signature2)
def test_verify_failure_with_wrong_raw_signature(self):
to_sign = b"foo"
# This signature has a wrong "r" value in the "(r,s)" raw signature.
wrong_signature = base64.urlsafe_b64decode(
b"m7oaRxUDeYqjZ8qiMwo0PZLTMZWKJLFQREpqce1StMIa_yXQQ-C5WgeIRHW7OqlYSDL0XbUrj_uAw9i-QhfOJQ=="
)
verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
assert not verifier.verify(to_sign, wrong_signature)
def test_from_string_pub_key(self):
verifier = es256.ES256Verifier.from_string(PUBLIC_KEY_BYTES)
assert isinstance(verifier, es256.ES256Verifier)
assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
def test_from_string_pub_key_unicode(self):
public_key = _helpers.from_bytes(PUBLIC_KEY_BYTES)
verifier = es256.ES256Verifier.from_string(public_key)
assert isinstance(verifier, es256.ES256Verifier)
assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
def test_from_string_pub_cert(self):
verifier = es256.ES256Verifier.from_string(PUBLIC_CERT_BYTES)
assert isinstance(verifier, es256.ES256Verifier)
assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
def test_from_string_pub_cert_unicode(self):
public_cert = _helpers.from_bytes(PUBLIC_CERT_BYTES)
verifier = es256.ES256Verifier.from_string(public_cert)
assert isinstance(verifier, es256.ES256Verifier)
assert isinstance(verifier._pubkey, ec.EllipticCurvePublicKey)
class TestES256Signer(object):
def test_from_string_pkcs1(self):
signer = es256.ES256Signer.from_string(PKCS1_KEY_BYTES)
assert isinstance(signer, es256.ES256Signer)
assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
def test_from_string_pkcs1_unicode(self):
key_bytes = _helpers.from_bytes(PKCS1_KEY_BYTES)
signer = es256.ES256Signer.from_string(key_bytes)
assert isinstance(signer, es256.ES256Signer)
assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
def test_from_string_bogus_key(self):
key_bytes = "bogus-key"
with pytest.raises(ValueError):
es256.ES256Signer.from_string(key_bytes)
def test_from_service_account_info(self):
signer = es256.ES256Signer.from_service_account_info(SERVICE_ACCOUNT_INFO)
assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
def test_from_service_account_info_missing_key(self):
with pytest.raises(ValueError) as excinfo:
es256.ES256Signer.from_service_account_info({})
assert excinfo.match(base._JSON_FILE_PRIVATE_KEY)
def test_from_service_account_file(self):
signer = es256.ES256Signer.from_service_account_file(SERVICE_ACCOUNT_JSON_FILE)
assert signer.key_id == SERVICE_ACCOUNT_INFO[base._JSON_FILE_PRIVATE_KEY_ID]
assert isinstance(signer._key, ec.EllipticCurvePrivateKey)
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