use newer version of sqlcipher

decrypt-db.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python2
+# -*- coding: UTF-8 -*-
+# File: decrypt-db.py
+# Author: Yuxin Wu <[email protected]>
+
+from argparse import ArgumentParser
+from pysqlcipher import dbapi2 as sqlite
+
+from hashlib import md5
+import sys
+import os
+
+def get_args():
+    parser = ArgumentParser()
+    parser.add_argument('db', help='path to EnMicroMsg.db')
+    parser.add_argument('imei', help='15 digit IMEI of your phone')
+    parser.add_argument('uin', help='WeChat UIN')
+    parser.add_argument('--output', help='output decrypted database',
+                        default='decrypted.db')
+    args = parser.parse_args()
+    return args
+
+def get_key(imei, uin):
+    a = md5(imei + uin)
+    return a.hexdigest()[:7]
+
+if __name__ == '__main__':
+    args = get_args()
+
+    output = args.output
+    if os.path.isfile(output):
+        print "{} already exists. Remove? (y/n)".format(args.output),
+        ans = raw_input()
+        if ans not in ['y', 'Y']:
+            print "Bye!"
+            sys.exit()
+        os.unlink(argsos.output)
+    key = get_key(args.imei, args.uin)
+    print "KEY: {}".format(key)
+
+    print "Dump decrypted database... "
+    conn = sqlite.connect(args.db)
+    c = conn.cursor()
+    c.execute("PRAGMA key = '" + key + "';")
+    c.execute("PRAGMA cipher_use_hmac = OFF;")
+    c.execute("PRAGMA cipher_page_size = 1024;")
+    c.execute("PRAGMA kdf_iter = 4000;")
+    c.execute("ATTACH DATABASE '" + args.output + "' AS db KEY '';")
+    c.execute("SELECT sqlcipher_export('db');" )
+    c.execute("DETACH DATABASE db;" )
+    c.close()