codekingpro/portable-devtools

1# Copyright (c) 2023, exiledkingcc2# All rights reserved.3#4# Redistribution and use in source and binary forms, with or without5# modification, are permitted provided that the following conditions are6# met:7#8# * Redistributions of source code must retain the above copyright notice,9# this list of conditions and the following disclaimer.10# * Redistributions in binary form must reproduce the above copyright notice,11# this list of conditions and the following disclaimer in the documentation12# and/or other materials provided with the distribution.13# * The name of the author may not be used to endorse or promote products14# derived from this software without specific prior written permission.15#16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"17# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE19# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE20# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR21# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF22# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS23# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN24# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)25# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE26# POSSIBILITY OF SUCH DAMAGE.27 28import secrets29 30from cryptography import __version__31from cryptography.hazmat.primitives.ciphers.algorithms import AES32from cryptography.hazmat.primitives.padding import PKCS733 34from pypdf._utils import logger_warning35from pypdf.errors import PdfStreamError36 37try:38    # 43.0.0 - https://cryptography.io/en/latest/changelog/#v43-0-039    from cryptography.hazmat.decrepit.ciphers.algorithms import ARC440except ImportError:41    from cryptography.hazmat.primitives.ciphers.algorithms import ARC442from cryptography.hazmat.primitives.ciphers.base import Cipher43from cryptography.hazmat.primitives.ciphers.modes import CBC, ECB44 45from pypdf._crypt_providers._base import CryptBase46 47crypt_provider = ("cryptography", __version__)48 49 50class CryptRC4(CryptBase):51    def __init__(self, key: bytes) -> None:52        self.cipher = Cipher(ARC4(key), mode=None)53 54    def encrypt(self, data: bytes) -> bytes:55        encryptor = self.cipher.encryptor()56        return encryptor.update(data) + encryptor.finalize()57 58    def decrypt(self, data: bytes, *, strict: bool = True) -> bytes:59        decryptor = self.cipher.decryptor()60        return decryptor.update(data) + decryptor.finalize()61 62 63class CryptAES(CryptBase):64    def __init__(self, key: bytes) -> None:65        self.alg = AES(key)66 67    def encrypt(self, data: bytes) -> bytes:68        iv = secrets.token_bytes(16)69        padder = PKCS7(128).padder()70        padded_data = padder.update(data) + padder.finalize()71 72        cipher = Cipher(self.alg, CBC(iv))73        encryptor = cipher.encryptor()74        return iv + encryptor.update(padded_data) + encryptor.finalize()75 76    def decrypt(self, data: bytes, *, strict: bool = True) -> bytes:77        iv = data[:16]78        data = data[16:]79        # for empty encrypted data80        if not data:81            return data82 83        if not strict and len(data) % 16 != 0:84            logger_warning("Adding missing padding.", src=__name__)85            padder = PKCS7(128).padder()86            data = padder.update(data) + padder.finalize()87 88        cipher = Cipher(self.alg, CBC(iv))89        decryptor = cipher.decryptor()90        try:91            padded_data = decryptor.update(data) + decryptor.finalize()92        except ValueError as exception:93            # Only raised in strict mode. Non-strict mode fixes padding.94            raise PdfStreamError(exception)95 96        unpadder = PKCS7(128).unpadder()97        try:98            return unpadder.update(padded_data) + unpadder.finalize()99        except ValueError as exception:100            if strict:101                raise PdfStreamError(exception)102            logger_warning(f"Ignoring padding error: {exception}", src=__name__)103            return padded_data[: -padded_data[-1]]104 105 106def rc4_encrypt(key: bytes, data: bytes) -> bytes:107    encryptor = Cipher(ARC4(key), mode=None).encryptor()108    return encryptor.update(data) + encryptor.finalize()109 110 111def rc4_decrypt(key: bytes, data: bytes) -> bytes:112    decryptor = Cipher(ARC4(key), mode=None).decryptor()113    return decryptor.update(data) + decryptor.finalize()114 115 116def aes_ecb_encrypt(key: bytes, data: bytes) -> bytes:117    encryptor = Cipher(AES(key), mode=ECB()).encryptor()118    return encryptor.update(data) + encryptor.finalize()119 120 121def aes_ecb_decrypt(key: bytes, data: bytes) -> bytes:122    decryptor = Cipher(AES(key), mode=ECB()).decryptor()123    return decryptor.update(data) + decryptor.finalize()124 125 126def aes_cbc_encrypt(key: bytes, iv: bytes, data: bytes) -> bytes:127    encryptor = Cipher(AES(key), mode=CBC(iv)).encryptor()128    return encryptor.update(data) + encryptor.finalize()129 130 131def aes_cbc_decrypt(key: bytes, iv: bytes, data: bytes) -> bytes:132    decryptor = Cipher(AES(key), mode=CBC(iv)).decryptor()133    return decryptor.update(data) + decryptor.finalize()134