add metamask extraction tool

tools/metamask2hashcat.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Gabriele 'matrix' Gristina
+# Version: 1.0
+# Date: Thu 12 Aug 2021 06:44:14 PM CEST
+# License: MIT
+
+# Extract metamask vault from browser and save to file, then you can use this tool
+# reference: https://metamask.zendesk.com/hc/en-us/articles/360018766351-How-to-use-the-Vault-Decryptor-with-the-MetaMask-Vault-Data
+
+import json
+import argparse
+
+def metamask_parser(file):
+  try:
+    f = open(file)
+
+    j = json.load(f)
+
+    if 'salt' not in j or 'iv' not in j or 'data' not in j:
+      print("! Invalid vault format ...")
+      parser.print_help()
+      exit(1)
+
+    print('$metamask$' + j['salt'] + '$' + j['iv'] + '$' + j['data'])
+  except ValueError as e:
+    parser.print_help()
+    exit(1)
+
+  exit(0)
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser(description="metamask2hashcat.py extraction tool")
+  parser.add_argument('--vault', required=True, help='set metamask vault (json) file from path', type=str)
+
+  args = parser.parse_args()
+  if args.vault:
+      metamask_parser(args.vault)
+  else:
+      parser.print_help()
+      exit(1)
+