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https://github.com/LC044/WeChatMsg
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207 lines
8.5 KiB
Python
207 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-#
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# -------------------------------------------------------------------------------
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# Name: getwxinfo.py
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# Description:
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# Author: xaoyaoo
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# Date: 2023/08/21
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# 微信数据库采用的加密算法是256位的AES-CBC。数据库的默认的页大小是4096字节即4KB，其中每一个页都是被单独加解密的。
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# 加密文件的每一个页都有一个随机的初始化向量，它被保存在每一页的末尾。
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# 加密文件的每一页都存有着消息认证码，算法使用的是HMAC-SHA1（安卓数据库使用的是SHA512）。它也被保存在每一页的末尾。
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# 每一个数据库文件的开头16字节都保存了一段唯一且随机的盐值，作为HMAC的验证和数据的解密。
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# 用来计算HMAC的key与解密的key是不同的，解密用的密钥是主密钥和之前提到的16字节的盐值通过PKCS5_PBKF2_HMAC1密钥扩展算法迭代64000次计算得到的。而计算HMAC的密钥是刚提到的解密密钥和16字节盐值异或0x3a的值通过PKCS5_PBKF2_HMAC1密钥扩展算法迭代2次计算得到的。
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# 为了保证数据部分长度是16字节即AES块大小的整倍数，每一页的末尾将填充一段空字节，使得保留字段的长度为48字节。
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# 综上，加密文件结构为第一页4KB数据前16字节为盐值，紧接着4032字节数据，再加上16字节IV和20字节HMAC以及12字节空字节；而后的页均是4048字节长度的加密数据段和48字节的保留段。
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# -------------------------------------------------------------------------------
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import argparse
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import hmac
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import hashlib
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import os
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from typing import Union, List
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from Cryptodome.Cipher import AES
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# from Crypto.Cipher import AES # 如果上面的导入失败，可以尝试使用这个
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SQLITE_FILE_HEADER = "SQLite format 3\x00" # SQLite文件头
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KEY_SIZE = 32
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DEFAULT_PAGESIZE = 4096
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DEFAULT_ITER = 64000
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# 通过密钥解密数据库
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def decrypt(key: str, db_path, out_path):
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"""
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通过密钥解密数据库
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:param key: 密钥 64位16进制字符串
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:param db_path: 待解密的数据库路径(必须是文件)
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:param out_path: 解密后的数据库输出路径(必须是文件)
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:return:
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"""
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if not os.path.exists(db_path) or not os.path.isfile(db_path):
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return False, f"[-] db_path:'{db_path}' File not found!"
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if not os.path.exists(os.path.dirname(out_path)):
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return False, f"[-] out_path:'{out_path}' File not found!"
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if len(key) != 64:
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return False, f"[-] key:'{key}' Len Error!"
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password = bytes.fromhex(key.strip())
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with open(db_path, "rb") as file:
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blist = file.read()
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salt = blist[:16]
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byteKey = hashlib.pbkdf2_hmac("sha1", password, salt, DEFAULT_ITER, KEY_SIZE)
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first = blist[16:DEFAULT_PAGESIZE]
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if len(salt) != 16:
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return False, f"[-] db_path:'{db_path}' File Error!"
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mac_salt = bytes([(salt[i] ^ 58) for i in range(16)])
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mac_key = hashlib.pbkdf2_hmac("sha1", byteKey, mac_salt, 2, KEY_SIZE)
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hash_mac = hmac.new(mac_key, first[:-32], hashlib.sha1)
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hash_mac.update(b'\x01\x00\x00\x00')
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if hash_mac.digest() != first[-32:-12]:
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return False, f"[-] Key Error! (key:'{key}'; db_path:'{db_path}'; out_path:'{out_path}' )"
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newblist = [blist[i:i + DEFAULT_PAGESIZE] for i in range(DEFAULT_PAGESIZE, len(blist), DEFAULT_PAGESIZE)]
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with open(out_path, "wb") as deFile:
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deFile.write(SQLITE_FILE_HEADER.encode())
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t = AES.new(byteKey, AES.MODE_CBC, first[-48:-32])
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decrypted = t.decrypt(first[:-48])
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deFile.write(decrypted)
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deFile.write(first[-48:])
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for i in newblist:
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t = AES.new(byteKey, AES.MODE_CBC, i[-48:-32])
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decrypted = t.decrypt(i[:-48])
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deFile.write(decrypted)
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deFile.write(i[-48:])
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return True, [db_path, out_path, key]
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def batch_decrypt(key: str, db_path: Union[str, List[str]], out_path: str, is_logging: bool = False):
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if not isinstance(key, str) or not isinstance(out_path, str) or not os.path.exists(out_path) or len(key) != 64:
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error = f"[-] (key:'{key}' or out_path:'{out_path}') Error!"
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if is_logging: print(error)
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return False, error
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process_list = []
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if isinstance(db_path, str):
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if not os.path.exists(db_path):
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error = f"[-] db_path:'{db_path}' not found!"
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if is_logging: print(error)
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return False, error
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if os.path.isfile(db_path):
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inpath = db_path
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outpath = os.path.join(out_path, 'de_' + os.path.basename(db_path))
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process_list.append([key, inpath, outpath])
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elif os.path.isdir(db_path):
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for root, dirs, files in os.walk(db_path):
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for file in files:
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inpath = os.path.join(root, file)
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rel = os.path.relpath(root, db_path)
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outpath = os.path.join(out_path, rel, 'de_' + file)
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if not os.path.exists(os.path.dirname(outpath)):
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os.makedirs(os.path.dirname(outpath))
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process_list.append([key, inpath, outpath])
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else:
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error = f"[-] db_path:'{db_path}' Error "
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if is_logging: print(error)
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return False, error
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elif isinstance(db_path, list):
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rt_path = os.path.commonprefix(db_path)
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if not os.path.exists(rt_path):
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rt_path = os.path.dirname(rt_path)
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for inpath in db_path:
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if not os.path.exists(inpath):
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erreor = f"[-] db_path:'{db_path}' not found!"
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if is_logging: print(erreor)
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return False, erreor
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inpath = os.path.normpath(inpath)
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rel = os.path.relpath(os.path.dirname(inpath), rt_path)
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outpath = os.path.join(out_path, rel, 'de_' + os.path.basename(inpath))
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if not os.path.exists(os.path.dirname(outpath)):
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os.makedirs(os.path.dirname(outpath))
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process_list.append([key, inpath, outpath])
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else:
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error = f"[-] db_path:'{db_path}' Error "
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if is_logging: print(error)
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return False, error
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result = []
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for i in process_list:
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result.append(decrypt(*i)) # 解密
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# 删除空文件夹
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for root, dirs, files in os.walk(out_path, topdown=False):
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for dir in dirs:
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if not os.listdir(os.path.join(root, dir)):
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os.rmdir(os.path.join(root, dir))
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if is_logging:
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print("=" * 32)
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success_count = 0
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fail_count = 0
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for code, ret in result:
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if code == False:
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print(ret)
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fail_count += 1
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else:
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print(f'[+] "{ret[0]}" -> "{ret[1]}"')
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success_count += 1
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print("-" * 32)
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print(f"[+] 共 {len(result)} 个文件, 成功 {success_count} 个, 失败 {fail_count} 个")
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print("=" * 32)
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return True, result
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def encrypt(key: str, db_path, out_path):
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"""
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通过密钥加密数据库
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:param key: 密钥 64位16进制字符串
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:param db_path: 待加密的数据库路径(必须是文件)
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:param out_path: 加密后的数据库输出路径(必须是文件)
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:return:
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"""
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if not os.path.exists(db_path) or not os.path.isfile(db_path):
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return False, f"[-] db_path:'{db_path}' File not found!"
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if not os.path.exists(os.path.dirname(out_path)):
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return False, f"[-] out_path:'{out_path}' File not found!"
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if len(key) != 64:
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return False, f"[-] key:'{key}' Len Error!"
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password = bytes.fromhex(key.strip())
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with open(db_path, "rb") as file:
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blist = file.read()
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salt = os.urandom(16) # 生成随机盐值
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byteKey = hashlib.pbkdf2_hmac("sha1", password, salt, DEFAULT_ITER, KEY_SIZE)
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# 计算消息认证码
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mac_salt = bytes([(salt[i] ^ 58) for i in range(16)])
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mac_key = hashlib.pbkdf2_hmac("sha1", byteKey, mac_salt, 2, KEY_SIZE)
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hash_mac = hmac.new(mac_key, blist[:-32], hashlib.sha1)
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hash_mac.update(b'\x01\x00\x00\x00')
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mac_digest = hash_mac.digest()
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newblist = [blist[i:i + DEFAULT_PAGESIZE] for i in range(DEFAULT_PAGESIZE, len(blist), DEFAULT_PAGESIZE)]
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with open(out_path, "wb") as enFile:
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enFile.write(salt) # 写入盐值
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enFile.write(mac_digest) # 写入消息认证码
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for i in newblist:
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t = AES.new(byteKey, AES.MODE_CBC, os.urandom(16)) # 生成随机的初始向量
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encrypted = t.encrypt(i) # 加密数据块
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enFile.write(encrypted)
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return True, [db_path, out_path, key] |