diff --git a/.gitignore b/.gitignore
index 68bc17f..076249d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -158,3 +158,7 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+*.json
+*.db
+exported/
diff --git a/booksnew.py b/booksnew.py
new file mode 100644
index 0000000..23de89e
--- /dev/null
+++ b/booksnew.py
@@ -0,0 +1,29 @@
+from os.path import isdir, join
+from zipfile import ZipFile
+
+
+class BooksNew:
+    def __init__(self, path: str):
+        self._path = path
+        self._is_zip = False
+        self._contain_dir_name = False
+        if not isdir(path):
+            self._z = ZipFile(path)
+            self._is_zip = True
+            try:
+                self._z.getinfo("booksnew/")
+                self._contain_dir_name = True
+            except KeyError:
+                pass
+
+    def get_chapter(self, book_id: int, chapter_id: int):
+        if self._is_zip:
+            if self._contain_dir_name:
+                path = f'booksnew/{book_id}/{chapter_id}.txt'
+            else:
+                path = f'{book_id}/{chapter_id}.txt'
+            return self._z.read(path).decode()
+        else:
+            with open(join(self._path, str(book_id), f"{chapter_id}.txt"), 'r',
+                      encoding='UTF-8') as f:
+                return f.read()
diff --git a/config.py b/config.py
new file mode 100644
index 0000000..6765a50
--- /dev/null
+++ b/config.py
@@ -0,0 +1,74 @@
+from argparse import Namespace
+from os.path import exists
+import json
+try:
+    from functools import cached_property
+except Exception:
+    cached_property = property
+
+
+class Config:
+    def __init__(self, cfg_path: str):
+        self._path = cfg_path
+        self._data = {}
+        self._args = Namespace()
+        if exists(cfg_path):
+            with open(cfg_path, 'r', encoding='UTF-8') as f:
+                self._data = json.load(f)
+        else:
+            self._data['db'] = 'cwm.db'
+            self._data['save_to_config'] = True
+            self._data['export_chapter_template'] = 'exported/<book_id>/<chapter_id>.txt'  # noqa: E501
+            self.save()
+
+    def add_args(self, args: Namespace):
+        self._args = args
+
+    def get_arg(self, key: str, default):
+        x = getattr(self._args, key, None)
+        if x is not None:
+            if self.save_to_config:
+                self._data[key] = x
+            return x
+        if key in self._data:
+            return self._data[key]
+        else:
+            return default
+
+    @cached_property
+    def booksnew(self):
+        return self.get_arg('booksnew', None)
+
+    @cached_property
+    def chapter_id(self):
+        return getattr(self._args, 'cid', None)
+
+    @cached_property
+    def cwmdb(self):
+        return self.get_arg('cwmdb', None)
+
+    @cached_property
+    def db(self):
+        return self.get_arg('db', 'cwm.db')
+
+    @cached_property
+    def export_chapter_template(self):
+        return self.get_arg('export_chapter_template', 'exported/<book_id>/<chapter_id>.txt')  # noqa: E501
+
+    def get_export_chapter(self, chapter):
+        temp = self.export_chapter_template
+        for k in chapter.keys():
+            temp = temp.replace(f'<{k}>', str(chapter[k]))
+        return temp
+
+    @cached_property
+    def key(self):
+        return self.get_arg('key', None)
+
+    @cached_property
+    def save_to_config(self):
+        return getattr(self._args, 'save_to_config', True)
+
+    def save(self):
+        with open(self._path, 'w', encoding='UTF-8') as f:
+            json.dump(self._data, f, ensure_ascii=False)
diff --git a/crypto.py b/crypto.py
new file mode 100644
index 0000000..9888e9c
--- /dev/null
+++ b/crypto.py
@@ -0,0 +1,14 @@
+from Crypto.Cipher import AES
+from hashlib import sha256
+from base64 import b64decode
+
+
+def decrypt(encrypted: str | bytes,
+            key: str | bytes = 'zG2nSeEfSHfvTCHy5LCcqtBbQehKNLXn') -> bytes:
+    if isinstance(key, str):
+        key = key.encode()
+    ekey = sha256(key).digest()
+    iv = b'\0' * 16
+    aes = AES.new(ekey, AES.MODE_CBC, iv)
+    data = aes.decrypt(b64decode(encrypted))
+    return data[0:len(data) - ord(chr(data[len(data) - 1]))]
diff --git a/db.py b/db.py
new file mode 100644
index 0000000..c45e497
--- /dev/null
+++ b/db.py
@@ -0,0 +1,77 @@
+import sqlite3
+from semver import Version
+from typing import Optional, Set, List
+
+
+VERSION_TABLE = '''CREATE TABLE version (
+id TEXT,
+version TEXT,
+PRIMARY KEY (id)
+);'''
+KEY_TABLE = '''CREATE TABLE key (
+chapter_id INT,
+user_id INT,
+key TEXT,
+PRIMARY KEY (chapter_id, user_id)
+);'''
+
+
+class CwmDb:
+    def __init__(self, db_path):
+        self._db = sqlite3.connect(db_path, check_same_thread=False)
+        self.version = Version(0, 0, 0, 0)
+        if not self.__check_database():
+            self.__create_table()
+
+    def __check_database(self):
+        self.__update_exists_tables()
+        v = self.__read_version()
+        if v is None:
+            return False
+        if v < self.version:
+            self.__update_exists_tables()
+            self.__write_version()
+        return True
+
+    def __create_table(self):
+        if 'version' not in self._exist_tables:
+            self._db.execute(VERSION_TABLE)
+            self.__write_version()
+        if 'key' not in self._exist_tables:
+            self._db.execute(KEY_TABLE)
+        self._db.commit()
+
+    def __write_version(self):
+        self._db.execute('INSERT OR REPLACE INTO version VALUES (?, ?);', [
+                         'main', str(self.version)])
+
+    def __read_version(self) -> Optional[Version]:
+        if 'version' not in self._exist_tables:
+            return None
+        cur = self._db.execute(
+            'SELECT version FROM version WHERE id = ?;', ['main'])
+        for i in cur:
+            try:
+                return Version.parse(i[0])
+            except Exception:
+                return None
+
+    def __update_exists_tables(self):
+        cur = self._db.execute('SELECT * FROM main.sqlite_master;')
+        self._exist_tables = {}
+        for i in cur:
+            if i[0] == 'table':
+                self._exist_tables[i[1]] = i
+
+    def add_key(self, chapter_id: int, user_id: int, key: str):
+        self._db.execute('INSERT OR REPLACE INTO key VALUES (?, ?, ?);', [
+                         chapter_id, user_id, key])
+
+    def get_all_keys_as_origin(self) -> Set[str]:
+        cur = self._db.execute('SELECT chapter_id, user_id FROM key;')
+        return {f'{i[0]}{i[1]}' for i in cur}
+
+    def get_key(self, chapter_id: int) -> List[str]:
+        cur = self._db.execute('SELECT key FROM key WHERE chapter_id = ?;', [
+                              chapter_id])
+        return [i[0] for i in cur]
diff --git a/export.py b/export.py
new file mode 100644
index 0000000..b6ec35c
--- /dev/null
+++ b/export.py
@@ -0,0 +1,48 @@
+from novelCiwei import NovelCiwei
+from db import CwmDb
+from config import Config
+from key import import_keys
+from booksnew import BooksNew
+from crypto import decrypt
+from os.path import dirname
+from os import makedirs
+
+
+key_imported = False
+
+
+def get_key(db: CwmDb, cfg: Config, chapter_id: int):
+    keys = db.get_key(chapter_id)
+    if len(keys) == 0:
+        if key_imported:
+            raise ValueError('The key is not found.')
+        else:
+            import_keys(cfg.key, db)
+        keys = db.get_key(chapter_id)
+        if len(keys) == 0:
+            raise ValueError('The key is not found.')
+    return keys
+
+
+def try_decrypt(db: CwmDb, cfg: Config, content, chapter_id: int):
+    keys = get_key(db, cfg, chapter_id)
+    for key in keys:
+        try:
+            return decrypt(content, key).decode()
+        except Exception:
+            pass
+    raise ValueError('Failed to decrypt the content.')
+
+
+def export_chapter(ncw: NovelCiwei, db: CwmDb, cfg: Config, bn: BooksNew,
+                   chapter_id: int):
+    chapter = ncw.get_chapter(chapter_id)
+    book_id = int(chapter['book_id'])
+    raw_content = bn.get_chapter(book_id, chapter_id)
+    content = try_decrypt(db, cfg, raw_content, chapter_id)
+    filename = cfg.get_export_chapter(chapter)
+    d = dirname(filename)
+    makedirs(d, exist_ok=True)
+    with open(filename, 'w', encoding='UTF-8') as f:
+        f.write(chapter['chapter_title'] + '\n')
+        f.write(content)
diff --git a/key.py b/key.py
new file mode 100644
index 0000000..30687a7
--- /dev/null
+++ b/key.py
@@ -0,0 +1,45 @@
+from os.path import isdir, join
+from os import listdir
+from db import CwmDb
+from zipfile import ZipFile
+from base64 import b64decode
+
+
+def import_keys(key: str, db: CwmDb):
+    is_zip = False
+    file_list = []
+    contain_dir_name = False
+    if isdir(key):
+        file_list = listdir(key)
+    else:
+        z = ZipFile(key)
+        is_zip = True
+        file_list = z.namelist()
+        if 'Y2hlcy8/' in file_list:
+            contain_dir_name = True
+            file_list = [i[8:] for i in file_list if i.startswith(
+                'Y2hlcy8/') and i != 'Y2hlcy8/']
+    try:
+        count = 0
+        keys = db.get_all_keys_as_origin()
+        for i in file_list:
+            oid = b64decode(i).decode()
+            if oid in keys:
+                continue
+            cid = int(oid[0:9])
+            uid = int(oid[9:])
+            if is_zip:
+                if contain_dir_name:
+                    path = 'Y2hlcy8/' + i
+                else:
+                    path = i
+                content = z.read(path).decode()
+            else:
+                content = open(join(key, i), 'r', encoding='UTF-8').read()
+            db.add_key(cid, uid, content)
+            count += 1
+        print(f'Imported {count} keys.')
+    finally:
+        db._db.commit()
+        if is_zip:
+            z.close()
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..1a3b4d7
--- /dev/null
+++ b/main.py
@@ -0,0 +1,46 @@
+from argparse import ArgumentParser
+from config import Config
+from db import CwmDb
+from novelCiwei import NovelCiwei
+from booksnew import BooksNew
+
+
+parser = ArgumentParser(description='A tool to export CiWeiMao novel cache.')
+parser.add_argument('-c', '--config', help='The path of the config file.', default='config.json')  # noqa: E501
+parser.add_argument('-d', '--db', help='The path of the database file.')
+parser.add_argument('-k', '--key', help='The path to Y2hlcy8 key directory or zip file.')  # noqa: E501
+parser.add_argument('--cwmdb', help='The path to NovelCiwei file.')
+parser.add_argument('-b', '--booksnew', help='The path to booksnew directory or zip file.')  # noqa: E501
+parser.add_argument('-C', '--cid', '--chapter-id', help='The chapter id.', type=int)  # noqa: E501
+parser.add_argument('--ect', '--export-chapter-template', help='The template of the exported chapter. Available key: <book_id>, <chapter_id> eta.')  # noqa: E501
+parser.add_argument('action', help='The action to do.', choices=['importkey', 'exportchapter'])  # noqa: E501
+
+
+def main(args=None):
+    arg = parser.parse_intermixed_args(args)
+    cfg = Config(arg.config)
+    cfg.add_args(arg)
+    try:
+        db = CwmDb(cfg.db)
+        if arg.action == 'importkey':
+            if cfg.key is None:
+                raise ValueError('The key is not specified.')
+            from key import import_keys
+            import_keys(cfg.key, db)
+        elif arg.action == 'exportchapter':
+            if cfg.cwmdb is None:
+                raise ValueError('The cwmdb is not specified.')
+            ncw = NovelCiwei(cfg.cwmdb)
+            if cfg.booksnew is None:
+                raise ValueError('The booksnew is not specified.')
+            bn = BooksNew(cfg.booksnew)
+            if cfg.chapter_id is None:
+                raise ValueError('The chapter id is not specified.')
+            from export import export_chapter
+            export_chapter(ncw, db, cfg, bn, cfg.chapter_id)
+    finally:
+        cfg.save()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/novelCiwei.py b/novelCiwei.py
new file mode 100644
index 0000000..3a5c1a2
--- /dev/null
+++ b/novelCiwei.py
@@ -0,0 +1,20 @@
+import sqlite3
+import json
+
+
+class NovelCiwei:
+    def __init__(self, db_path: str):
+        self._db = sqlite3.connect(db_path, check_same_thread=False)
+
+    def get_book_in_shelf(self, book_id: int):
+        cur = self._db.execute(
+            'SELECT book_info FROM shelf_book_info WHERE book_id = ?;',
+            [str(book_id)])
+        for i in cur:
+            return json.loads(i)
+
+    def get_chapter(self, chapter_id: int):
+        cur = self._db.execute(
+            'SELECT * FROM catalog1 WHERE chapter_id = ?;', [str(chapter_id)])
+        cur.row_factory = sqlite3.Row
+        return cur.fetchone()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e218f03
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+PyCryptodome
+semver