calvin.erfmann/WhatsApp-Chat-Exporter
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Add support for decrypting contact db from crypt15 backup

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KnugiHK
2023-12-03 13:40:21 +08:00
parent 3847836ed6
commit 0d626519ec
3 changed files with 38 additions and 14 deletions
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16
Whatsapp_Chat_Exporter/extract.py
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@@ -1,11 +1,7 @@
#!/usr/bin/python3
import sqlite3
import json
import jinja2
import os
import shutil
import re
import io
import hmac
from pathlib import Path
@@ -13,7 +9,7 @@ from mimetypes import MimeTypes
from hashlib import sha256
from base64 import b64decode, b64encode
from Whatsapp_Chat_Exporter.data_model import ChatStore, Message
from Whatsapp_Chat_Exporter.utility import MAX_SIZE, ROW_SIZE, determine_metadata, get_status_location
from Whatsapp_Chat_Exporter.utility import MAX_SIZE, ROW_SIZE, DbType, determine_metadata, get_status_location
from Whatsapp_Chat_Exporter.utility import rendering, Crypt, Device, get_file_name, setup_template
from Whatsapp_Chat_Exporter.utility import brute_force_offset, CRYPT14_OFFSETS, JidType
@@ -53,7 +49,7 @@ def _extract_encrypted_key(keyfile):
return _generate_hmac_of_hmac(key_stream)
def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=False):
def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=False, db_type=DbType.MESSAGE):
if not support_backup:
return 1
if isinstance(key, io.IOBase):
@@ -83,8 +79,12 @@ def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=Fals
if len(database) < 131:
raise ValueError("The crypt15 file must be at least 131 bytes")
t1 = t2 = None
iv = database[8:24]
db_offset = database[0] + 2 # Skip protobuf + protobuf size and backup type
if db_type == DbType.MESSAGE:
iv = database[8:24]
db_offset = database[0] + 2 # Skip protobuf + protobuf size and backup type
elif db_type == DbType.CONTACT:
iv = database[7:23]
db_offset = database[0] + 1 # Skip protobuf + protobuf size
db_ciphertext = database[db_offset:]
if t1 != t2: