├── .github └── workflows │ └── release.yml ├── .gitignore ├── LICENSE ├── README.md ├── decrypt.py ├── gui.py └── requirements.txt /.github/workflows/release.yml: -------------------------------------------------------------------------------- 1 | name: Release ScienceDecrypting 2 | 3 | on: [create] 4 | 5 | jobs: 6 | build: 7 | if: ${{ startsWith(github.ref,'refs/tags/') }} 8 | runs-on: windows-latest 9 | 10 | steps: 11 | - uses: actions/checkout@v2 12 | - name: Set up Python 13 | uses: actions/setup-python@v2 14 | with: 15 | python-version: 3.6 16 | - name: Install dependencies 17 | run: | 18 | python -m pip install --upgrade pip 19 | pip install pyinstaller 20 | pip install -r requirements.txt 21 | - name: build artifact 22 | run: pyinstaller -F -w -n ScienceDecrypting gui.py 23 | - name: upload artifact 24 | uses: actions/upload-artifact@v2 25 | with: 26 | name: ScienceDecrypting.exe 27 | path: dist/ScienceDecrypting.exe 28 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | __pycache__ 2 | build 3 | dist -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Description 2 | 破解CAJViewer加有效期限制的文档，无损转为普通PDF格式文件，保留文字和目录，支持解密以下网站下载的文档： 3 | - 科学文库 ( https://book.sciencereading.cn ) 4 | - 国家标准全文数据库 ( https://kns.cnki.net/kns8?dbcode=CISD / https://www.spc.org.cn/ ) 5 | - 其他，待验证... 6 | 7 | ## Usage 8 | 9 | ### 选择一：使用预编译的exe文件 10 | 在[Release页面](https://github.com/LonerUniverse/ScienceDecrypting_GUI/releases/tag/v1.0)下载exe文件执行即可。 11 | 12 | ### 选择二：使用源码文件 13 | 1. 下载安装Python3 ( https://www.python.org/downloads/ )。 14 | 2. 下载源码库：点击右上角Code按钮并选择Download ZIP。下载完成后，完整解压压缩包，并进入解压文件夹，在文件夹地址栏输入cmd并回车以启动在当前目录下运行的cmd程序。 15 | 3. 安装依赖 。 16 | 17 | 在cmd窗口中运行以下指令。 18 | ```bash 19 | pip3 install -U pip 20 | pip3 install -r requirements.txt 21 | ``` 22 | 4. 执行decrypt.py 23 | ``` 24 | Usage: python3 decrypt.py -i INPUT_FILE -o OUTPUT_FILE 25 | 26 | Options: 27 | -h, --help show this help message and exit 28 | -i FILE, --input=FILE 原始文件名 29 | -o FILE, --ouput=FILE 输出文件名 30 | 31 | Example: python3 decrypt.py -i test.pdf -o test_dec.pdf 32 | ``` 33 | 34 | ## 科学文库图书下载 35 | 大部分图书都可以通过国家[图书馆读者云门户](http://read.nlc.cn/outRes/outResList?type=%E7%94%B5%E5%AD%90%E5%9B%BE%E4%B9%A6)进行下载，少量无法下载的图书如果迫切需要可以提issue。 36 | -------------------------------------------------------------------------------- /decrypt.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | 3 | import base64 4 | import sys 5 | import traceback 6 | import requests 7 | import os 8 | import re 9 | import hashlib 10 | import tempfile 11 | from xml.etree import ElementTree 12 | from optparse import OptionParser 13 | import hashlib 14 | from cryptography.hazmat.primitives.ciphers import Cipher, modes, algorithms 15 | from cryptography.hazmat.primitives import padding 16 | from pikepdf import Pdf 17 | 18 | req_data = """ 19 | 20 | {} 21 | 22 | 23 | """ 24 | iv_first = b"200CFC8299B84aa980E945F63D3EF48D" 25 | iv_first = iv_first[:16] 26 | 27 | 28 | class CustomException(Exception): 29 | pass 30 | 31 | 32 | def aes_decrypt(key, iv, data, pad=False): 33 | cipher = Cipher(algorithms.AES(key), modes.CBC(iv)) 34 | dec = cipher.decryptor() 35 | ret = dec.update(data) + dec.finalize() 36 | if not pad: 37 | return ret 38 | unpadder = padding.PKCS7(128).unpadder() 39 | return unpadder.update(ret) + unpadder.finalize() 40 | 41 | 42 | def request_password(url, file_id): 43 | r = requests.post(url, headers={ 44 | "User-Agent": "Readerdex 2.0", 45 | "Cache-Control": "no-cache" 46 | }, data=req_data.format(file_id)) 47 | if r.status_code != 200: 48 | raise CustomException( 49 | "服务器异常，请稍后再试, file id: {}".format(file_id)) 50 | try: 51 | root = ElementTree.fromstring(r.text) 52 | except Exception: 53 | raise CustomException( 54 | "invilid response, file id: {}".format(file_id)) 55 | password = root.find("./password").text 56 | if not password or not password.strip(): 57 | raise CustomException( 58 | "无法获取密码，文件可能已过期, file id:{}".format(file_id)) 59 | return password.strip() 60 | 61 | 62 | def decrypt_file_key(password_from_file, password_from_server, iv_from_file, right_meta, rights): 63 | pass_dec = aes_decrypt(password_from_server, iv_first, 64 | base64.b64decode(password_from_file)) 65 | m = hashlib.sha256() 66 | m.update(pass_dec[:0x20]) 67 | m.update(right_meta) 68 | sha256 = m.digest() 69 | iv_second = base64.b64decode(iv_from_file) 70 | rights_dec = aes_decrypt(sha256, iv_second[:16], base64.b64decode(rights)) 71 | m = re.search(r"([0-9a-f]+)", 72 | rights_dec.decode("utf-8")) 73 | if not m: 74 | raise CustomException("fail to get encrypt key: {}", rights_dec) 75 | pass_in_rights = m.group(1) 76 | pass_in_rights += "AppendCA" 77 | m = hashlib.sha1() 78 | m.update(pass_in_rights.encode("utf-8")) 79 | return m.digest()[:0x10] 80 | 81 | 82 | def decrypt_file(src, dest): 83 | print("[Log] 解析源文件....") 84 | with open(src, "rb") as fp: 85 | # find rights position 86 | fp.seek(0, os.SEEK_END) 87 | fp.seek(fp.tell() - 30, os.SEEK_SET) 88 | tail = fp.read() 89 | m = re.search(rb"startrights (\d+),(\d+)", tail) 90 | if not m: 91 | raise CustomException("文件格式错误 {}".format(tail)) 92 | # find rights 93 | fp.seek(int(m.group(1)), os.SEEK_SET) 94 | eof_offset = int(m.group(1)) - 13 95 | right_meta = fp.read(int(m.group(2))).decode("latin") 96 | # request stage 1 password 97 | root = ElementTree.fromstring(right_meta) 98 | drm_url = root.find("./protect/auth/permit/server/url").text 99 | file_id = root.find("./file-id").text 100 | password_from_file = root.find("./protect/auth/permit/password").text 101 | iv_from_file = root.find("./protect/auth/iv").text 102 | rights = root.find("./rights").text 103 | stripped_right_meta = re.sub( 104 | r"\[\w+/=]+\", "", right_meta) 105 | 106 | print("[Log] 请求密钥...") 107 | password_from_server = request_password(drm_url, file_id) 108 | 109 | print("[Log] 解密DRM信息...") 110 | file_key = decrypt_file_key(password_from_file, 111 | password_from_server.encode("ascii"), 112 | iv_from_file, 113 | stripped_right_meta.encode("ascii"), 114 | rights) 115 | print("[Log] 解密文件...") 116 | src_fp = open(src, "rb") 117 | temp_fp = tempfile.TemporaryFile() 118 | 119 | # fix pdf format 120 | src_fp.seek(eof_offset - 40, os.SEEK_SET) 121 | content = src_fp.read(40) 122 | m = re.search(rb'startxref\s+(\d+)\s', content) 123 | if not m: 124 | raise CustomException("unable to find xref") 125 | src_fp.seek(0, os.SEEK_SET) 126 | temp_fp.write(src_fp.read(int(m.group(1)) - 512)) 127 | encryption_obj = b"< /U <1> /P -4 /CF << /StdCF << /Type /CryptAlgorithm /CFM /AESV2 /AuthEvent /DocOpen >> >> /StrF /StdCF /StmF /StdCF>>" 128 | for line in src_fp: 129 | if b"%%EOF" in line: 130 | temp_fp.write(b"%%EOF") 131 | break 132 | if b"SubFilter/TTKN.PubSec.s1" in line: 133 | origin_len = len(line) 134 | line = encryption_obj + b"\n" * (origin_len - len(encryption_obj)) 135 | temp_fp.write(line) 136 | src_fp.close() 137 | temp_fp.seek(0, os.SEEK_SET) 138 | out = open(dest, "wb") 139 | 140 | print("[Log] 写入文件") 141 | Pdf.open(temp_fp, password=file_key.hex(), hex_password=True).save(out) 142 | temp_fp.close() 143 | out.close() 144 | print("[Success] 解密成功!") 145 | 146 | 147 | def main(): 148 | parser = OptionParser( 149 | usage="Usage: python3 %prog -i INPUT_FILE -o OUTPUT_FILE") 150 | parser.add_option("-i", "--input", dest="src", 151 | help="原始文件名", metavar="FILE") 152 | parser.add_option("-o", "--ouput", dest="dst", 153 | help="输出文件名", metavar="FILE") 154 | (options, _) = parser.parse_args() 155 | if not options.src or not options.dst: 156 | parser.print_help() 157 | exit(0) 158 | if not os.path.isfile(options.src): 159 | print("输入文件不存在") 160 | parser.print_help() 161 | exit(0) 162 | if os.path.isfile(options.dst): 163 | ans = input("文件 {} 已存在，继续运行将覆盖该文件，是否继续 [y/N]: ".format(options.dst)) 164 | if ans.lower() not in ["y", "yes"]: 165 | exit(0) 166 | 167 | decrypt_file(options.src, options.dst) 168 | 169 | 170 | if __name__ == "__main__": 171 | try: 172 | main() 173 | except KeyboardInterrupt: 174 | print("Killed by user") 175 | sys.exit(0) 176 | except (CustomException, Exception) as exc: 177 | if not isinstance(exc, CustomException): 178 | print("[Error] 未知错误: ", str(exc)) 179 | else: 180 | print("[Error]", str(exc)) 181 | print("\n如果你需要帮助，请复制以下信息到GitHub ( https://github.com/301Moved/ScienceDecrypting/issues/new ) 上提交Issue") 182 | print("-" * 64) 183 | traceback.print_exc() 184 | -------------------------------------------------------------------------------- /gui.py: -------------------------------------------------------------------------------- 1 | import sys 2 | import traceback 3 | import threading 4 | import tkinter as tk 5 | from tkinter.filedialog import askopenfile 6 | 7 | from decrypt import decrypt_file, CustomException 8 | 9 | 10 | class StdoutRedirector(object): 11 | def __init__(self, text_widget): 12 | self.text_space = text_widget 13 | 14 | def write(self, string): 15 | self.text_space.insert('end', string) 16 | self.text_space.see('end') 17 | 18 | 19 | def open_file(): 20 | file = askopenfile(filetypes=[ 21 | ("PDF/CAJ Files", "*")]) 22 | if not file: 23 | return 24 | src = file.name 25 | dst_array = src.split(".")[:-1] 26 | dst_array.append("dec") 27 | dst_array.append("pdf") 28 | dst = ".".join(dst_array) 29 | print("开始解密", src) 30 | threading.Thread(target=decrypt_background, args=(src, dst)).start() 31 | 32 | 33 | def decrypt_background(src, dst): 34 | try: 35 | decrypt_file(src, dst) 36 | print("解密成功！解密后的文件为：", dst) 37 | except Exception as exc: 38 | if not isinstance(exc, CustomException): 39 | print("[Error] 解密失败，未知错误: ", str(exc)) 40 | else: 41 | print("[Error] 解密失败，", str(exc)) 42 | print("\n如果你需要帮助，请复制以下信息到GitHub ( https://github.com/301Moved/ScienceDecrypting/issues/new ) 上提交Issue") 43 | print("-" * 64) 44 | traceback.print_exc() 45 | 46 | 47 | if __name__ == "__main__": 48 | root = tk.Tk() 49 | root.title("ScienceDecrypting") 50 | root.geometry("800x600") 51 | btn = tk.Button(root, text='选择要解密的文件', command=lambda: open_file()) 52 | btn.pack(side=tk.TOP, pady=20) 53 | LOG = tk.Text(root) 54 | LOG.pack() 55 | sys.stdout = StdoutRedirector(LOG) 56 | sys.stderr = StdoutRedirector(LOG) 57 | tk.mainloop() 58 | -------------------------------------------------------------------------------- /requirements.txt: -------------------------------------------------------------------------------- 1 | requests==2.22.0 2 | cryptography==3.4.8 3 | pikepdf==3.0.0 4 | --------------------------------------------------------------------------------