安卓apk逆向之crc32检测打补丁包crc32_patcher.py

运行 crc32_patcher.py 脚本，并传入两个参数：

第一个参数：您已打补丁并构建的 APK 文件

第二个参数：原始 APK 文件

crc32_patcher.py

import zipfile
import binascii
import sys


def crc_patch(crc: int):
    def inner_crc(*args):
        return crc

    return inner_crc

orig_crc_binascii = binascii.crc32

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print(f"Usage {sys.argv[0]} patched.apk original.apk")
    patched_file = ".".join(sys.argv[1].split("/")[-1].split(".")[:-1]) + "_Patched.apk"
    with zipfile.ZipFile(sys.argv[2]) as orig:
        with zipfile.ZipFile(sys.argv[1]) as patched:
            with zipfile.ZipFile(
                patched_file, "w"
            ) as patched_patched:
                for i, file in enumerate(patched.filelist):
                    a = patched.read(file.filename)
                    try:
                        crc = list(filter(lambda x: x.filename == file.filename, orig.filelist))[0].CRC
                        setattr(zipfile, "crc32", crc_patch(crc))
                    except:
                        pass
                    patched_patched.writestr(file, a)
                    setattr(zipfile, "crc32", orig_crc_binascii)
    print(f"Successfully generated crc32 patched file in {patched_file}")