94 lines
3.3 KiB
Python
94 lines
3.3 KiB
Python
# Copyright (c) 2023, exiledkingcc
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from pypdf._crypt_providers._base import CryptBase
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from pypdf.errors import DependencyError
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_DEPENDENCY_ERROR_STR = "cryptography>=3.1 is required for AES algorithm"
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crypt_provider = ("local_crypt_fallback", "0.0.0")
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class CryptRC4(CryptBase):
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def __init__(self, key: bytes) -> None:
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self.s = bytearray(range(256))
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j = 0
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for i in range(256):
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j = (j + self.s[i] + key[i % len(key)]) % 256
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self.s[i], self.s[j] = self.s[j], self.s[i]
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def encrypt(self, data: bytes) -> bytes:
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s = bytearray(self.s)
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out = [0 for _ in range(len(data))]
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i, j = 0, 0
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for k in range(len(data)):
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i = (i + 1) % 256
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j = (j + s[i]) % 256
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s[i], s[j] = s[j], s[i]
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x = s[(s[i] + s[j]) % 256]
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out[k] = data[k] ^ x
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return bytes(bytearray(out))
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def decrypt(self, data: bytes) -> bytes:
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return self.encrypt(data)
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class CryptAES(CryptBase):
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def __init__(self, key: bytes) -> None:
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pass
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def encrypt(self, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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def decrypt(self, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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def rc4_encrypt(key: bytes, data: bytes) -> bytes:
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return CryptRC4(key).encrypt(data)
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def rc4_decrypt(key: bytes, data: bytes) -> bytes:
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return CryptRC4(key).decrypt(data)
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def aes_ecb_encrypt(key: bytes, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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def aes_ecb_decrypt(key: bytes, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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def aes_cbc_encrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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def aes_cbc_decrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
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raise DependencyError(_DEPENDENCY_ERROR_STR)
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