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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.backends.interfaces import DHBackend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.ed25519 import (
Ed25519PrivateKey, Ed25519PublicKey
)
from ...utils import (
load_vectors_from_file, raises_unsupported_algorithm
)
def load_ed25519_vectors(vector_data):
"""
djb's ed25519 vectors are structured as a colon delimited array:
0: secret key (32 bytes) + public key (32 bytes)
1: public key (32 bytes)
2: message (0+ bytes)
3: signature + message (64+ bytes)
"""
data = []
for line in vector_data:
secret_key, public_key, message, signature, _ = line.split(':')
secret_key = secret_key[0:64]
signature = signature[0:128]
data.append({
"secret_key": secret_key,
"public_key": public_key,
"message": message,
"signature": signature
})
return data
@pytest.mark.supported(
only_if=lambda backend: not backend.ed25519_supported(),
skip_message="Requires OpenSSL without Ed25519 support"
)
@pytest.mark.requires_backend_interface(interface=DHBackend)
def test_ed25519_unsupported(backend):
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed25519PublicKey.from_public_bytes(b"0" * 32)
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed25519PrivateKey.from_private_bytes(b"0" * 32)
with raises_unsupported_algorithm(
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
Ed25519PrivateKey.generate()
@pytest.mark.supported(
only_if=lambda backend: backend.ed25519_supported(),
skip_message="Requires OpenSSL with Ed25519 support"
)
@pytest.mark.requires_backend_interface(interface=DHBackend)
class TestEd25519Signing(object):
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join("asymmetric", "Ed25519", "sign.input"),
load_ed25519_vectors
)
)
def test_sign_verify_input(self, vector, backend):
sk = binascii.unhexlify(vector["secret_key"])
pk = binascii.unhexlify(vector["public_key"])
message = binascii.unhexlify(vector["message"])
signature = binascii.unhexlify(vector["signature"])
private_key = Ed25519PrivateKey.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 = Ed25519PrivateKey.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 = Ed25519PrivateKey.generate()
assert key
assert key.public_key()
def test_load_public_bytes(self, backend):
public_key = Ed25519PrivateKey.generate().public_key()
public_bytes = public_key.public_bytes(
serialization.Encoding.Raw, serialization.PublicFormat.Raw
)
public_key2 = Ed25519PublicKey.from_public_bytes(public_bytes)
assert public_bytes == public_key2.public_bytes(
serialization.Encoding.Raw, serialization.PublicFormat.Raw
)
def test_invalid_type_public_bytes(self, backend):
with pytest.raises(TypeError):
Ed25519PublicKey.from_public_bytes(object())
def test_invalid_type_private_bytes(self, backend):
with pytest.raises(TypeError):
Ed25519PrivateKey.from_private_bytes(object())
def test_invalid_length_from_public_bytes(self, backend):
with pytest.raises(ValueError):
Ed25519PublicKey.from_public_bytes(b"a" * 31)
with pytest.raises(ValueError):
Ed25519PublicKey.from_public_bytes(b"a" * 33)
def test_invalid_length_from_private_bytes(self, backend):
with pytest.raises(ValueError):
Ed25519PrivateKey.from_private_bytes(b"a" * 31)
with pytest.raises(ValueError):
Ed25519PrivateKey.from_private_bytes(b"a" * 33)
def test_invalid_private_bytes(self, backend):
key = Ed25519PrivateKey.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 = Ed25519PrivateKey.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
)
@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 = Ed25519PrivateKey.generate()
serialized = key.private_bytes(encoding, fmt, encryption)
loaded_key = load_func(serialized, passwd, backend)
assert isinstance(loaded_key, Ed25519PrivateKey)
def test_buffer_protocol(self, backend):
private_bytes = os.urandom(32)
key = Ed25519PrivateKey.from_private_bytes(bytearray(private_bytes))
assert key.private_bytes(
serialization.Encoding.Raw,
serialization.PrivateFormat.Raw,
serialization.NoEncryption()
) == private_bytes
|
