45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
# 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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import binascii
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import pytest
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from cryptography.exceptions import InvalidTag
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from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305
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from .utils import wycheproof_tests
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from ..hazmat.primitives.test_aead import _aead_supported
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@pytest.mark.skipif(
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not _aead_supported(ChaCha20Poly1305),
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reason="Requires OpenSSL with ChaCha20Poly1305 support",
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)
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@wycheproof_tests("chacha20_poly1305_test.json")
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def test_chacha20poly1305(backend, wycheproof):
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key = binascii.unhexlify(wycheproof.testcase["key"])
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iv = binascii.unhexlify(wycheproof.testcase["iv"])
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aad = binascii.unhexlify(wycheproof.testcase["aad"])
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msg = binascii.unhexlify(wycheproof.testcase["msg"])
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ct = binascii.unhexlify(wycheproof.testcase["ct"])
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tag = binascii.unhexlify(wycheproof.testcase["tag"])
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if wycheproof.valid:
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chacha = ChaCha20Poly1305(key)
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computed_ct = chacha.encrypt(iv, msg, aad)
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assert computed_ct == ct + tag
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computed_msg = chacha.decrypt(iv, ct + tag, aad)
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assert computed_msg == msg
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elif len(iv) != 12:
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chacha = ChaCha20Poly1305(key)
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with pytest.raises(ValueError):
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chacha.encrypt(iv, msg, aad)
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with pytest.raises(ValueError):
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chacha.decrypt(iv, ct + tag, aad)
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else:
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chacha = ChaCha20Poly1305(key)
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with pytest.raises(InvalidTag):
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chacha.decrypt(iv, msg + tag, aad)
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