44 lines
1.0 KiB
Python
44 lines
1.0 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 abc
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import typing
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# This exists to break an import cycle. It is normally accessible from the
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# ciphers module.
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class CipherAlgorithm(metaclass=abc.ABCMeta):
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@property
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@abc.abstractmethod
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def name(self) -> str:
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"""
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A string naming this mode (e.g. "AES", "Camellia").
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"""
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@property
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@abc.abstractmethod
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def key_sizes(self) -> typing.FrozenSet[int]:
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"""
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Valid key sizes for this algorithm in bits
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"""
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@property
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@abc.abstractmethod
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def key_size(self) -> int:
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"""
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The size of the key being used as an integer in bits (e.g. 128, 256).
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"""
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class BlockCipherAlgorithm(metaclass=abc.ABCMeta):
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key: bytes
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@property
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@abc.abstractmethod
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def block_size(self) -> int:
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"""
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The size of a block as an integer in bits (e.g. 64, 128).
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"""
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