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feat: Implement ES256 for JWT verification (#340)
feat: Implement EC256 for JWT verification
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google.auth.crypt.es256 module | ||
============================== | ||
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.. automodule:: google.auth.crypt.es256 | ||
:members: | ||
:inherited-members: | ||
:show-inheritance: |
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.. toctree:: | ||
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google.auth.crypt.base | ||
google.auth.crypt.es256 | ||
google.auth.crypt.rsa |
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cryptography | ||
sphinx-docstring-typing | ||
urllib3 | ||
requests | ||
|
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# Copyright 2017 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:https://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. | ||
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"""ECDSA (ES256) verifier and signer that use the ``cryptography`` library. | ||
""" | ||
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import cryptography.exceptions | ||
from cryptography.hazmat import backends | ||
from cryptography.hazmat.primitives import hashes | ||
from cryptography.hazmat.primitives import serialization | ||
from cryptography.hazmat.primitives.asymmetric import ec | ||
from cryptography.hazmat.primitives.asymmetric import padding | ||
import cryptography.x509 | ||
import pkg_resources | ||
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from google.auth import _helpers | ||
from google.auth.crypt import base | ||
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_IMPORT_ERROR_MSG = ( | ||
"cryptography>=1.4.0 is required to use cryptography-based ECDSA " "algorithms" | ||
) | ||
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try: # pragma: NO COVER | ||
release = pkg_resources.get_distribution("cryptography").parsed_version | ||
if release < pkg_resources.parse_version("1.4.0"): | ||
raise ImportError(_IMPORT_ERROR_MSG) | ||
except pkg_resources.DistributionNotFound: # pragma: NO COVER | ||
raise ImportError(_IMPORT_ERROR_MSG) | ||
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_CERTIFICATE_MARKER = b"-----BEGIN CERTIFICATE-----" | ||
_BACKEND = backends.default_backend() | ||
_PADDING = padding.PKCS1v15() | ||
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class ES256Verifier(base.Verifier): | ||
"""Verifies ECDSA cryptographic signatures using public keys. | ||
Args: | ||
public_key ( | ||
cryptography.hazmat.primitives.asymmetric.ec.ECDSAPublicKey): | ||
The public key used to verify signatures. | ||
""" | ||
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def __init__(self, public_key): | ||
self._pubkey = public_key | ||
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@_helpers.copy_docstring(base.Verifier) | ||
def verify(self, message, signature): | ||
message = _helpers.to_bytes(message) | ||
try: | ||
self._pubkey.verify(signature, message, ec.ECDSA(hashes.SHA256())) | ||
return True | ||
except (ValueError, cryptography.exceptions.InvalidSignature): | ||
return False | ||
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@classmethod | ||
def from_string(cls, public_key): | ||
"""Construct an Verifier instance from a public key or public | ||
certificate string. | ||
Args: | ||
public_key (Union[str, bytes]): The public key in PEM format or the | ||
x509 public key certificate. | ||
Returns: | ||
Verifier: The constructed verifier. | ||
Raises: | ||
ValueError: If the public key can't be parsed. | ||
""" | ||
public_key_data = _helpers.to_bytes(public_key) | ||
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if _CERTIFICATE_MARKER in public_key_data: | ||
cert = cryptography.x509.load_pem_x509_certificate( | ||
public_key_data, _BACKEND | ||
) | ||
pubkey = cert.public_key() | ||
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else: | ||
pubkey = serialization.load_pem_public_key(public_key_data, _BACKEND) | ||
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return cls(pubkey) | ||
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class ES256Signer(base.Signer, base.FromServiceAccountMixin): | ||
"""Signs messages with an ECDSA private key. | ||
Args: | ||
private_key ( | ||
cryptography.hazmat.primitives.asymmetric.ec.ECDSAPrivateKey): | ||
The private key to sign with. | ||
key_id (str): Optional key ID used to identify this private key. This | ||
can be useful to associate the private key with its associated | ||
public key or certificate. | ||
""" | ||
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def __init__(self, private_key, key_id=None): | ||
self._key = private_key | ||
self._key_id = key_id | ||
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@property | ||
@_helpers.copy_docstring(base.Signer) | ||
def key_id(self): | ||
return self._key_id | ||
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@_helpers.copy_docstring(base.Signer) | ||
def sign(self, message): | ||
message = _helpers.to_bytes(message) | ||
return self._key.sign(message, ec.ECDSA(hashes.SHA256())) | ||
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@classmethod | ||
def from_string(cls, key, key_id=None): | ||
"""Construct a RSASigner from a private key in PEM format. | ||
Args: | ||
key (Union[bytes, str]): Private key in PEM format. | ||
key_id (str): An optional key id used to identify the private key. | ||
Returns: | ||
google.auth.crypt._cryptography_rsa.RSASigner: The | ||
constructed signer. | ||
Raises: | ||
ValueError: If ``key`` is not ``bytes`` or ``str`` (unicode). | ||
UnicodeDecodeError: If ``key`` is ``bytes`` but cannot be decoded | ||
into a UTF-8 ``str``. | ||
ValueError: If ``cryptography`` "Could not deserialize key data." | ||
""" | ||
key = _helpers.to_bytes(key) | ||
private_key = serialization.load_pem_private_key( | ||
key, password=None, backend=_BACKEND | ||
) | ||
return cls(private_key, key_id=key_id) |
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