113 lines
4.2 KiB
Python
113 lines
4.2 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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import secrets
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from cryptography import __version__
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from cryptography.hazmat.primitives import padding
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from cryptography.hazmat.primitives.ciphers.algorithms import AES, ARC4
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from cryptography.hazmat.primitives.ciphers.base import Cipher
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from cryptography.hazmat.primitives.ciphers.modes import CBC, ECB
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from pypdf._crypt_providers._base import CryptBase
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crypt_provider = ("cryptography", __version__)
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class CryptRC4(CryptBase):
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def __init__(self, key: bytes) -> None:
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self.cipher = Cipher(ARC4(key), mode=None)
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def encrypt(self, data: bytes) -> bytes:
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encryptor = self.cipher.encryptor()
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return encryptor.update(data) + encryptor.finalize()
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def decrypt(self, data: bytes) -> bytes:
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decryptor = self.cipher.decryptor()
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return decryptor.update(data) + decryptor.finalize()
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class CryptAES(CryptBase):
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def __init__(self, key: bytes) -> None:
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self.alg = AES(key)
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def encrypt(self, data: bytes) -> bytes:
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iv = secrets.token_bytes(16)
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pad = padding.PKCS7(128).padder()
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data = pad.update(data) + pad.finalize()
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cipher = Cipher(self.alg, CBC(iv))
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encryptor = cipher.encryptor()
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return iv + encryptor.update(data) + encryptor.finalize()
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def decrypt(self, data: bytes) -> bytes:
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iv = data[:16]
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data = data[16:]
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# for empty encrypted data
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if not data:
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return data
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# just for robustness, it does not happen under normal circumstances
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if len(data) % 16 != 0:
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pad = padding.PKCS7(128).padder()
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data = pad.update(data) + pad.finalize()
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cipher = Cipher(self.alg, CBC(iv))
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decryptor = cipher.decryptor()
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d = decryptor.update(data) + decryptor.finalize()
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return d[: -d[-1]]
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def rc4_encrypt(key: bytes, data: bytes) -> bytes:
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encryptor = Cipher(ARC4(key), mode=None).encryptor()
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return encryptor.update(data) + encryptor.finalize()
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def rc4_decrypt(key: bytes, data: bytes) -> bytes:
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decryptor = Cipher(ARC4(key), mode=None).decryptor()
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return decryptor.update(data) + decryptor.finalize()
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def aes_ecb_encrypt(key: bytes, data: bytes) -> bytes:
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encryptor = Cipher(AES(key), mode=ECB()).encryptor()
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return encryptor.update(data) + encryptor.finalize()
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def aes_ecb_decrypt(key: bytes, data: bytes) -> bytes:
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decryptor = Cipher(AES(key), mode=ECB()).decryptor()
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return decryptor.update(data) + decryptor.finalize()
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def aes_cbc_encrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
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encryptor = Cipher(AES(key), mode=CBC(iv)).encryptor()
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return encryptor.update(data) + encryptor.finalize()
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def aes_cbc_decrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
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decryptor = Cipher(AES(key), mode=CBC(iv)).decryptor()
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return decryptor.update(data) + decryptor.finalize()
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