146 lines
3.7 KiB
Python
146 lines
3.7 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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from __future__ import annotations
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import warnings
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from cryptography import utils
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from cryptography.hazmat.primitives._cipheralgorithm import (
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BlockCipherAlgorithm,
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CipherAlgorithm,
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_verify_key_size,
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)
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class ARC4(CipherAlgorithm):
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name = "RC4"
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key_sizes = frozenset([40, 56, 64, 80, 128, 160, 192, 256])
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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class TripleDES(BlockCipherAlgorithm):
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name = "3DES"
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block_size = 64
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key_sizes = frozenset([64, 128, 192])
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def __init__(self, key: bytes):
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# Check the key type before the length-based deprecation warnings so
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# an invalid key type doesn't trigger a spurious warning.
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utils._check_byteslike("key", key)
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if len(key) == 8:
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warnings.warn(
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"Single-key TripleDES (8-byte keys) is deprecated and "
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"support will be removed in a future release. Use 24-byte "
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"keys instead (e.g., key + key + key).",
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utils.DeprecatedIn47,
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stacklevel=2,
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)
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key = key + key + key
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elif len(key) == 16:
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warnings.warn(
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"Two-key TripleDES (16-byte keys) is deprecated and "
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"support will be removed in a future release. Use 24-byte "
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"keys instead (e.g., key + key[:8]).",
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utils.DeprecatedIn47,
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stacklevel=2,
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)
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key = key + key[:8]
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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# Not actually supported, marker for tests
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class _DES:
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key_size = 64
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class Blowfish(BlockCipherAlgorithm):
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name = "Blowfish"
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block_size = 64
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key_sizes = frozenset(range(32, 449, 8))
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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class CAST5(BlockCipherAlgorithm):
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name = "CAST5"
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block_size = 64
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key_sizes = frozenset(range(40, 129, 8))
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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class SEED(BlockCipherAlgorithm):
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name = "SEED"
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block_size = 128
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key_sizes = frozenset([128])
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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class IDEA(BlockCipherAlgorithm):
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name = "IDEA"
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block_size = 64
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key_sizes = frozenset([128])
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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class Camellia(BlockCipherAlgorithm):
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name = "camellia"
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block_size = 128
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key_sizes = frozenset([128, 192, 256])
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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# This class only allows RC2 with a 128-bit key. No support for
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# effective key bits or other key sizes is provided.
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class RC2(BlockCipherAlgorithm):
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name = "RC2"
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block_size = 64
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key_sizes = frozenset([128])
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def __init__(self, key: bytes):
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self.key = _verify_key_size(self, key)
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@property
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def key_size(self) -> int:
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return len(self.key) * 8
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