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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import binascii
import os
import pytest
from cryptography.exceptions import InvalidSignature, _Reasons
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.ed448 import (
Ed448PrivateKey, Ed448PublicKey
)
from ...utils import (
load_nist_vectors, load_vectors_from_file, raises_unsupported_algorithm
)
@pytest.mark.supported(
only_if=lambda backend: not backend.ed448_supported(),
skip_message="Requires OpenSSL without Ed448 support"
)
def test_ed448_unsupported(backend):
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed448PublicKey.from_public_bytes(b"0" * 57)
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed448PrivateKey.from_private_bytes(b"0" * 57)
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed448PrivateKey.generate()
@pytest.mark.supported(
only_if=lambda backend: backend.ed448_supported(),
skip_message="Requires OpenSSL with Ed448 support"
)
class TestEd448Signing(object):
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join("asymmetric", "Ed448", "rfc8032.txt"),
load_nist_vectors
)
)
def test_sign_input(self, vector, backend):
if vector.get("context") is not None:
pytest.skip("ed448 contexts are not currently supported")
sk = binascii.unhexlify(vector["secret"])
pk = binascii.unhexlify(vector["public"])
message = binascii.unhexlify(vector["message"])
signature = binascii.unhexlify(vector["signature"])
private_key = Ed448PrivateKey.from_private_bytes(sk)
computed_sig = private_key.sign(message)
assert computed_sig == signature
public_key = private_key.public_key()
assert public_key.public_bytes(
serialization.Encoding.Raw, serialization.PublicFormat.Raw
) == pk
public_key.verify(signature, message)
def test_invalid_signature(self, backend):
key = Ed448PrivateKey.generate()
signature = key.sign(b"test data")
with pytest.raises(InvalidSignature):
key.public_key().verify(signature, b"wrong data")
with pytest.raises(InvalidSignature):
key.public_key().verify(b"0" * 64, b"test data")
def test_generate(self, backend):
key = Ed448PrivateKey.generate()
assert key
assert key.public_key()
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join("asymmetric", "Ed448", "rfc8032.txt"),
load_nist_vectors
)
)
def test_pub_priv_bytes_raw(self, vector, backend):
sk = binascii.unhexlify(vector["secret"])
pk = binascii.unhexlify(vector["public"])
private_key = Ed448PrivateKey.from_private_bytes(sk)
assert private_key.private_bytes(
serialization.Encoding.Raw,
serialization.PrivateFormat.Raw,
serialization.NoEncryption()
) == sk
assert private_key.public_key().public_bytes(
serialization.Encoding.Raw, serialization.PublicFormat.Raw
) == pk
public_key = Ed448PublicKey.from_public_bytes(pk)
assert public_key.public_bytes(
serialization.Encoding.Raw, serialization.PublicFormat.Raw
) == pk
@pytest.mark.parametrize(
("encoding", "fmt", "encryption", "passwd", "load_func"),
[
(
serialization.Encoding.PEM,
serialization.PrivateFormat.PKCS8,
serialization.BestAvailableEncryption(b"password"),
b"password",
serialization.load_pem_private_key
),
(
serialization.Encoding.DER,
serialization.PrivateFormat.PKCS8,
serialization.BestAvailableEncryption(b"password"),
b"password",
serialization.load_der_private_key
),
(
serialization.Encoding.PEM,
serialization.PrivateFormat.PKCS8,
serialization.NoEncryption(),
None,
serialization.load_pem_private_key
),
(
serialization.Encoding.DER,
serialization.PrivateFormat.PKCS8,
serialization.NoEncryption(),
None,
serialization.load_der_private_key
),
]
)
def test_round_trip_private_serialization(self, encoding, fmt, encryption,
passwd, load_func, backend):
key = Ed448PrivateKey.generate()
serialized = key.private_bytes(encoding, fmt, encryption)
loaded_key = load_func(serialized, passwd, backend)
assert isinstance(loaded_key, Ed448PrivateKey)
def test_invalid_type_public_bytes(self, backend):
with pytest.raises(TypeError):
Ed448PublicKey.from_public_bytes(object())
def test_invalid_type_private_bytes(self, backend):
with pytest.raises(TypeError):
Ed448PrivateKey.from_private_bytes(object())
def test_invalid_length_from_public_bytes(self, backend):
with pytest.raises(ValueError):
Ed448PublicKey.from_public_bytes(b"a" * 56)
with pytest.raises(ValueError):
Ed448PublicKey.from_public_bytes(b"a" * 58)
def test_invalid_length_from_private_bytes(self, backend):
with pytest.raises(ValueError):
Ed448PrivateKey.from_private_bytes(b"a" * 56)
with pytest.raises(ValueError):
Ed448PrivateKey.from_private_bytes(b"a" * 58)
def test_invalid_private_bytes(self, backend):
key = Ed448PrivateKey.generate()
with pytest.raises(ValueError):
key.private_bytes(
serialization.Encoding.Raw,
serialization.PrivateFormat.Raw,
None
)
with pytest.raises(ValueError):
key.private_bytes(
serialization.Encoding.Raw,
serialization.PrivateFormat.PKCS8,
None
)
with pytest.raises(ValueError):
key.private_bytes(
serialization.Encoding.PEM,
serialization.PrivateFormat.Raw,
serialization.NoEncryption()
)
def test_invalid_public_bytes(self, backend):
key = Ed448PrivateKey.generate().public_key()
with pytest.raises(ValueError):
key.public_bytes(
serialization.Encoding.Raw,
serialization.PublicFormat.SubjectPublicKeyInfo
)
with pytest.raises(ValueError):
key.public_bytes(
serialization.Encoding.PEM,
serialization.PublicFormat.PKCS1
)
with pytest.raises(ValueError):
key.public_bytes(
serialization.Encoding.PEM,
serialization.PublicFormat.Raw
)
def test_buffer_protocol(self, backend):
private_bytes = os.urandom(57)
key = Ed448PrivateKey.from_private_bytes(bytearray(private_bytes))
assert key.private_bytes(
serialization.Encoding.Raw,
serialization.PrivateFormat.Raw,
serialization.NoEncryption()
) == private_bytes
def test_malleability(self, backend):
# This is a signature where r > the group order. It should be
# rejected to prevent signature malleability issues. This test can
# be removed when wycheproof grows ed448 vectors
public_bytes = binascii.unhexlify(
"fedb02a658d74990244d9d10cf338e977565cbbda6b24c716829ed6ee1e4f28cf"
"2620c052db8d878f6243bffc22242816c1aaa67d2f3603600"
)
signature = binascii.unhexlify(
"0cc16ba24d69277f927c1554b0f08a2a711bbdd20b058ccc660d00ca13542a3ce"
"f9e5c44c54ab23a2eb14f947e167b990b080863e28b399380f30db6e54d5d1406"
"d23378ffde11b1fb81b2b438a3b8e8aa7f7f4e1befcc905023fab5a5465053844"
"f04cf0c1b51d84760f869588687f57500"
)
key = Ed448PublicKey.from_public_bytes(public_bytes)
with pytest.raises(InvalidSignature):
key.verify(signature, b"8")
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