58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
# test_cipher_modes.py
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#
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# Copyright (C) 2006-2022 wolfSSL Inc.
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#
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# This file is part of wolfSSL. (formerly known as CyaSSL)
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#
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# wolfSSL is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# wolfSSL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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# pylint: disable=missing-docstring, import-error, protected-access
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import pytest
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from wolfcrypt.ciphers import (
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_FEEDBACK_MODES,
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MODE_CBC, MODE_CTR, MODE_ECB, MODE_CFB, MODE_OFB,
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)
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from wolfcrypt._ffi import lib as _lib
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def test_feedback_modes_only_advertises_supported():
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"""
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F-4015: _FEEDBACK_MODES is used as the "supported modes" gate in
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_Cipher.__init__. It must not advertise modes that the constructor
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then turns around and rejects.
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"""
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assert MODE_CBC in _FEEDBACK_MODES
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assert MODE_CTR in _FEEDBACK_MODES
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for unsupported in (MODE_ECB, MODE_CFB, MODE_OFB):
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assert unsupported not in _FEEDBACK_MODES
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@pytest.mark.skipif(not _lib.AES_ENABLED, reason="AES not enabled")
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def test_unsupported_mode_gives_single_consistent_error():
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"""
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F-4015: previously MODE_ECB passed the first "is supported" check and
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then hit a contradictory "not supported by this cipher" branch. The
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rejection must now be a single, consistent message.
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"""
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from wolfcrypt.ciphers import Aes # ty: ignore[possibly-missing-import]
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key = b"0" * 16
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iv = b"0" * 16
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with pytest.raises(ValueError) as exc_info:
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Aes.new(key, MODE_ECB, iv)
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assert "by this cipher" not in str(exc_info.value)
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