--crack supports hashcat, aircrack, john, cowpatty, and pyrit.

* Still not "print" option for --crack.
* Checks hashcat for devices, uses --force if no devices are found.
* Interrupting --crack stops entire process, not just a single crack attempt
* Changed wordlist location, hopefully completes #102.

wifite/tools/john.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from .dependency import Dependency
+from ..config import Configuration
+from ..util.color import Color
+from ..util.process import Process
+from ..tools.hashcat import HcxPcapTool
+
+import os
+
+
+class John(Dependency):
+    ''' Wrapper for John program. '''
+    dependency_required = False
+    dependency_name = 'john'
+    dependency_url = 'http://www.openwall.com/john/'
+
+
+    @staticmethod
+    def crack_handshake(handshake, show_command=False):
+        john_file = HcxPcapTool.generate_john_file(handshake, show_command=show_command)
+
+        # Crack john file
+        command = [
+            'john',
+            '--format=wpapsk', # wpapsk-cuda or wpapsk-opencl
+            '--wordlist', Configuration.wordlist,
+            john_file
+        ]
+        if show_command:
+            Color.pl('{+} {D}{C}Running %s{W}' % ' '.join(command))
+        process = Process(command)
+        process.wait()
+
+        # Show the password (if found)
+        command = ['john', '--show', john_file]
+        if show_command:
+            Color.pl('{+} {D}{C}Running %s{W}' % ' '.join(command))
+        process = Process(command)
+        stdout, stderr = process.get_output()
+
+        key = None
+        if not '0 password hashes cracked' in stdout:
+            for line in stdout.split('\n'):
+                if handshake.capfile in line:
+                    key = line.split(':')[1]
+                    break
+
+        if os.path.exists(john_file):
+            os.remove(john_file)
+
+        return key