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# Copyright (c) 2023, exiledkingcc
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import secrets
from Crypto import __version__
from Crypto.Cipher import AES, ARC4
from Crypto.Util.Padding import pad
from pypdf._crypt_providers._base import CryptBase
crypt_provider = ("pycryptodome", __version__)
class CryptRC4(CryptBase):
def __init__(self, key: bytes) -> None:
self.key = key
def encrypt(self, data: bytes) -> bytes:
return ARC4.ARC4Cipher(self.key).encrypt(data)
def decrypt(self, data: bytes) -> bytes:
return ARC4.ARC4Cipher(self.key).decrypt(data)
class CryptAES(CryptBase):
def __init__(self, key: bytes) -> None:
self.key = key
def encrypt(self, data: bytes) -> bytes:
iv = secrets.token_bytes(16)
data = pad(data, 16)
aes = AES.new(self.key, AES.MODE_CBC, iv)
return iv + aes.encrypt(data)
def decrypt(self, data: bytes) -> bytes:
iv = data[:16]
data = data[16:]
# for empty encrypted data
if not data:
return data
# just for robustness, it does not happen under normal circumstances
if len(data) % 16 != 0:
data = pad(data, 16)
aes = AES.new(self.key, AES.MODE_CBC, iv)
d = aes.decrypt(data)
return d[: -d[-1]]
def rc4_encrypt(key: bytes, data: bytes) -> bytes:
return ARC4.ARC4Cipher(key).encrypt(data)
def rc4_decrypt(key: bytes, data: bytes) -> bytes:
return ARC4.ARC4Cipher(key).decrypt(data)
def aes_ecb_encrypt(key: bytes, data: bytes) -> bytes:
return AES.new(key, AES.MODE_ECB).encrypt(data)
def aes_ecb_decrypt(key: bytes, data: bytes) -> bytes:
return AES.new(key, AES.MODE_ECB).decrypt(data)
def aes_cbc_encrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
return AES.new(key, AES.MODE_CBC, iv).encrypt(data)
def aes_cbc_decrypt(key: bytes, iv: bytes, data: bytes) -> bytes:
return AES.new(key, AES.MODE_CBC, iv).decrypt(data)
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