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50 lines
1.4 KiB
50 lines
1.4 KiB
7 months ago
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# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import binascii
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import pytest
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from cryptography.exceptions import InvalidSignature
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from cryptography.hazmat.backends.interfaces import DSABackend
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from cryptography.hazmat.primitives import hashes, serialization
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_DIGESTS = {
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"SHA-1": hashes.SHA1(),
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"SHA-224": hashes.SHA224(),
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"SHA-256": hashes.SHA256(),
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}
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@pytest.mark.requires_backend_interface(interface=DSABackend)
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@pytest.mark.wycheproof_tests(
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"dsa_test.json",
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)
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def test_dsa_signature(backend, wycheproof):
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key = serialization.load_der_public_key(
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binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
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)
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digest = _DIGESTS[wycheproof.testgroup["sha"]]
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if (
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wycheproof.valid or (
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wycheproof.acceptable and not wycheproof.has_flag("NoLeadingZero")
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)
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):
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key.verify(
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binascii.unhexlify(wycheproof.testcase["sig"]),
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binascii.unhexlify(wycheproof.testcase["msg"]),
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digest,
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)
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else:
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with pytest.raises(InvalidSignature):
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key.verify(
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binascii.unhexlify(wycheproof.testcase["sig"]),
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binascii.unhexlify(wycheproof.testcase["msg"]),
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digest,
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)
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