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import json
from jose.backends import ECKey
from jose.constants import ALGORITHMS
from jose.exceptions import JOSEError, JWKError
try:
import ecdsa
from jose.backends.ecdsa_backend import ECDSAECKey
except ImportError:
ECDSAECKey = ecdsa = None
try:
from cryptography.hazmat.backends import default_backend as CryptographyBackend
from cryptography.hazmat.primitives.asymmetric import ec as CryptographyEc
from jose.backends.cryptography_backend import CryptographyECKey
except ImportError:
CryptographyECKey = CryptographyEc = CryptographyBackend = None
import pytest
private_key = """-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIOiSs10XnBlfykk5zsJRmzYybKdMlGniSJcssDvUcF6DoAoGCCqGSM49
AwEHoUQDQgAE7gb4edKJ7ul9IgomCdcOebQTZ8qktqtBfRKboa71CfEKzBruUi+D
WkG0HJWIORlPbvXME+DRh6G/yVOKnTm88Q==
-----END EC PRIVATE KEY-----"""
# Private key generated using NIST256p curve
TOO_SHORT_PRIVATE_KEY = b"""\
-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIMlUyYGOpjV4bbW0C9FKS2zkspD0L/5vJLnr6sJoLdc+oAoGCCqGSM49
AwEHoUQDQgAE6TDUNj5QXl+RKdZvBV+cg7Td6cJRB+Ta8XAhIuCAzonq0Ix//1+C
pNSsy11sIKmMl61YJzxvZ6WkNluBmkDPCQ==
-----END EC PRIVATE KEY-----
"""
# ES256 signatures generated to test conversion logic
DER_SIGNATURE = (
b"0F\x02!\x00\x89yG\x81W\x01\x11\x9b0\x08\xa4\xd0\xe3g([\x07\xb5\x01\xb3"
b"\x9d\xdf \xd1\xbc\xedK\x01\x87:}\xf2\x02!\x00\xb2shTA\x00\x1a\x13~\xba"
b"J\xdb\xeem\x12\x1e\xfeMO\x04\xb2[\x86A\xbd\xc6hu\x953X\x1e"
)
RAW_SIGNATURE = (
b"\x89yG\x81W\x01\x11\x9b0\x08\xa4\xd0\xe3g([\x07\xb5\x01\xb3\x9d\xdf "
b"\xd1\xbc\xedK\x01\x87:}\xf2\xb2shTA\x00\x1a\x13~\xbaJ\xdb\xeem\x12\x1e"
b"\xfeMO\x04\xb2[\x86A\xbd\xc6hu\x953X\x1e"
)
def _backend_exception_types():
"""Build the backend exception types based on available backends."""
if None not in (ECDSAECKey, ecdsa):
yield ECDSAECKey, ecdsa.BadDigestError
if CryptographyECKey is not None:
yield CryptographyECKey, TypeError
@pytest.mark.ecdsa
@pytest.mark.skipif(None in (ECDSAECKey, ecdsa), reason="python-ecdsa backend not available")
def test_key_from_ecdsa():
key = ecdsa.SigningKey.from_pem(private_key)
assert not ECKey(key, ALGORITHMS.ES256).is_public()
@pytest.mark.cryptography
@pytest.mark.skipif(CryptographyECKey is None, reason="pyca/cryptography backend not available")
@pytest.mark.parametrize(
"algorithm, expected_length", ((ALGORITHMS.ES256, 32), (ALGORITHMS.ES384, 48), (ALGORITHMS.ES512, 66))
)
def test_cryptography_sig_component_length(algorithm, expected_length):
# Put mapping inside here to avoid more complex handling for test runs that do not have pyca/cryptography
mapping = {
ALGORITHMS.ES256: CryptographyEc.SECP256R1,
ALGORITHMS.ES384: CryptographyEc.SECP384R1,
ALGORITHMS.ES512: CryptographyEc.SECP521R1,
}
key = CryptographyECKey(
CryptographyEc.generate_private_key(mapping[algorithm](), backend=CryptographyBackend()), algorithm
)
assert key._sig_component_length() == expected_length
@pytest.mark.cryptography
@pytest.mark.skipif(CryptographyECKey is None, reason="pyca/cryptography backend not available")
def test_cryptograhy_der_to_raw():
key = CryptographyECKey(private_key, ALGORITHMS.ES256)
assert key._der_to_raw(DER_SIGNATURE) == RAW_SIGNATURE
@pytest.mark.cryptography
@pytest.mark.skipif(CryptographyECKey is None, reason="pyca/cryptography backend not available")
def test_cryptograhy_raw_to_der():
key = CryptographyECKey(private_key, ALGORITHMS.ES256)
assert key._raw_to_der(RAW_SIGNATURE) == DER_SIGNATURE
class TestECAlgorithm:
def test_key_from_pem(self):
assert not ECKey(private_key, ALGORITHMS.ES256).is_public()
def test_to_pem(self):
key = ECKey(private_key, ALGORITHMS.ES256)
assert not key.is_public()
assert key.to_pem().strip() == private_key.strip().encode("utf-8")
public_pem = key.public_key().to_pem()
assert ECKey(public_pem, ALGORITHMS.ES256).is_public()
@pytest.mark.parametrize("Backend,ExceptionType", _backend_exception_types())
def test_key_too_short(self, Backend, ExceptionType):
key = Backend(TOO_SHORT_PRIVATE_KEY, ALGORITHMS.ES512)
with pytest.raises(ExceptionType):
key.sign(b"foo")
def test_get_public_key(self):
key = ECKey(private_key, ALGORITHMS.ES256)
pubkey = key.public_key()
pubkey2 = pubkey.public_key()
assert pubkey == pubkey2
def test_string_secret(self):
key = "secret"
with pytest.raises(JOSEError):
ECKey(key, ALGORITHMS.ES256)
def test_object(self):
key = object()
with pytest.raises(JOSEError):
ECKey(key, ALGORITHMS.ES256)
def test_invalid_algorithm(self):
with pytest.raises(JWKError):
ECKey(private_key, "nonexistent")
with pytest.raises(JWKError):
ECKey({"kty": "bla"}, ALGORITHMS.ES256)
def test_EC_jwk(self):
key = {
"kty": "EC",
"kid": "bilbo.baggins@hobbiton.example",
"use": "sig",
"crv": "P-521",
"x": "AHKZLLOsCOzz5cY97ewNUajB957y-C-U88c3v13nmGZx6sYl_oJXu9A5RkTKqjqvjyekWF-7ytDyRXYgCF5cj0Kt",
"y": "AdymlHvOiLxXkEhayXQnNCvDX4h9htZaCJN34kfmC6pV5OhQHiraVySsUdaQkAgDPrwQrJmbnX9cwlGfP-HqHZR1",
"d": "AAhRON2r9cqXX1hg-RoI6R1tX5p2rUAYdmpHZoC1XNM56KtscrX6zbKipQrCW9CGZH3T4ubpnoTKLDYJ_fF3_rJt",
}
assert not ECKey(key, ALGORITHMS.ES512).is_public()
del key["d"]
# We are now dealing with a public key.
assert ECKey(key, ALGORITHMS.ES512).is_public()
del key["x"]
# This key is missing a required parameter.
with pytest.raises(JWKError):
ECKey(key, ALGORITHMS.ES512)
def test_verify(self):
key = ECKey(private_key, ALGORITHMS.ES256)
msg = b"test"
signature = key.sign(msg)
public_key = key.public_key()
assert bool(public_key.verify(msg, signature))
assert not bool(public_key.verify(msg, b"not a signature"))
def assert_parameters(self, as_dict, private):
assert isinstance(as_dict, dict)
# Public parameters should always be there.
assert "x" in as_dict
assert "y" in as_dict
assert "crv" in as_dict
assert "kty" in as_dict
assert as_dict["kty"] == "EC"
if private:
# Private parameters as well
assert "d" in as_dict
else:
# Private parameters should be absent
assert "d" not in as_dict
# as_dict should be serializable to JSON
json.dumps(as_dict)
def test_to_dict(self):
key = ECKey(private_key, ALGORITHMS.ES256)
self.assert_parameters(key.to_dict(), private=True)
self.assert_parameters(key.public_key().to_dict(), private=False)
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