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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 (
AlreadyFinalized, InvalidSignature, _Reasons
)
from cryptography.hazmat.primitives.poly1305 import Poly1305
from ...utils import (
load_nist_vectors, load_vectors_from_file, raises_unsupported_algorithm
)
@pytest.mark.supported(
only_if=lambda backend: not backend.poly1305_supported(),
skip_message="Requires OpenSSL without poly1305 support"
)
def test_poly1305_unsupported(backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_MAC):
Poly1305(b"0" * 32)
@pytest.mark.supported(
only_if=lambda backend: backend.poly1305_supported(),
skip_message="Requires OpenSSL with poly1305 support"
)
class TestPoly1305(object):
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join("poly1305", "rfc7539.txt"), load_nist_vectors
)
)
def test_vectors(self, vector, backend):
key = binascii.unhexlify(vector["key"])
msg = binascii.unhexlify(vector["msg"])
tag = binascii.unhexlify(vector["tag"])
poly = Poly1305(key)
poly.update(msg)
assert poly.finalize() == tag
assert Poly1305.generate_tag(key, msg) == tag
Poly1305.verify_tag(key, msg, tag)
def test_key_with_no_additional_references(self, backend):
poly = Poly1305(os.urandom(32))
assert len(poly.finalize()) == 16
def test_raises_after_finalize(self, backend):
poly = Poly1305(b"0" * 32)
poly.finalize()
with pytest.raises(AlreadyFinalized):
poly.update(b"foo")
with pytest.raises(AlreadyFinalized):
poly.finalize()
def test_reject_unicode(self, backend):
poly = Poly1305(b"0" * 32)
with pytest.raises(TypeError):
poly.update(u'')
with pytest.raises(TypeError):
Poly1305.generate_tag(b"0" * 32, u'')
def test_verify(self, backend):
poly = Poly1305(b"0" * 32)
poly.update(b"msg")
tag = poly.finalize()
with pytest.raises(AlreadyFinalized):
poly.verify(b"")
poly2 = Poly1305(b"0" * 32)
poly2.update(b"msg")
poly2.verify(tag)
Poly1305.verify_tag(b"0" * 32, b"msg", tag)
def test_invalid_verify(self, backend):
poly = Poly1305(b"0" * 32)
poly.update(b"msg")
with pytest.raises(InvalidSignature):
poly.verify(b"")
p2 = Poly1305(b"0" * 32)
p2.update(b"msg")
with pytest.raises(InvalidSignature):
p2.verify(b"\x00" * 16)
with pytest.raises(InvalidSignature):
Poly1305.verify_tag(b"0" * 32, b"msg", b"\x00" * 16)
def test_verify_reject_unicode(self, backend):
poly = Poly1305(b"0" * 32)
with pytest.raises(TypeError):
poly.verify(u'')
with pytest.raises(TypeError):
Poly1305.verify_tag(b"0" * 32, b"msg", u'')
def test_invalid_key_type(self, backend):
with pytest.raises(TypeError):
Poly1305(object())
with pytest.raises(TypeError):
Poly1305.generate_tag(object(), b"msg")
def test_invalid_key_length(self, backend):
with pytest.raises(ValueError):
Poly1305(b"0" * 31)
with pytest.raises(ValueError):
Poly1305.generate_tag(b"0" * 31, b"msg")
with pytest.raises(ValueError):
Poly1305(b"0" * 33)
with pytest.raises(ValueError):
Poly1305.generate_tag(b"0" * 33, b"msg")
def test_buffer_protocol(self, backend):
key = binascii.unhexlify(
b"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cb"
b"c207075c0"
)
msg = binascii.unhexlify(
b"2754776173206272696c6c69672c20616e642074686520736c69746"
b"87920746f7665730a446964206779726520616e642067696d626c65"
b"20696e2074686520776162653a0a416c6c206d696d7379207765726"
b"52074686520626f726f676f7665732c0a416e6420746865206d6f6d"
b"65207261746873206f757467726162652e"
)
key = bytearray(key)
poly = Poly1305(key)
poly.update(bytearray(msg))
assert poly.finalize() == binascii.unhexlify(
b"4541669a7eaaee61e708dc7cbcc5eb62"
)
assert Poly1305.generate_tag(key, msg) == binascii.unhexlify(
b"4541669a7eaaee61e708dc7cbcc5eb62"
)
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