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Added decryptImage and saveImage functions #133

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Added decryptImage and saveImage functions #133

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37 changes: 34 additions & 3 deletions backend/whatsapp.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,11 @@
#!/usr/bin/env python
# -*- coding: utf-8 -*-

import binascii
import sys;

from axolotl.kdf.hkdfv3 import HKDFv3
from axolotl.util.byteutil import ByteUtil

sys.dont_write_bytecode = True;

import os;
Expand All @@ -20,7 +24,7 @@
import hashlib;
import hmac;
import traceback;

import urllib2
import websocket;
import curve25519;
import pyqrcode;
Expand Down Expand Up @@ -264,7 +268,34 @@ def sendTextMessage(self, number, text):
self.messageSentCount = self.messageSentCount + 1
self.messageQueue[messageId] = {"desc": "__sending"}
self.activeWs.send(payload, websocket.ABNF.OPCODE_BINARY)


def decryptImage(self, url, mediaKey):
try:
response = urllib2.urlopen(url)
encimg = response.read()
cryptKeys = "576861747341707020496d616765204b657973"
refkey = base64.b64decode(mediaKey)
derivative = HKDFv3().deriveSecrets(refkey, binascii.unhexlify(cryptKeys), 112)
parts = ByteUtil.split(derivative, 16, 32)
iv = parts[0]
cipherKey = parts[1]
e_img = encimg[:-10]
AES.key_size = 128
cr_obj = AES.new(key=cipherKey, mode=AES.MODE_CBC, IV=iv)
return cr_obj.decrypt(e_img)
except urllib2.HTTPError as err:
return False

def saveImage(self, message):
mediaKey = message['message']['imageMessage']['mediaKey']
url = message['message']['imageMessage']['url']
messageId = message['key']['id']
decryptedImage = self.decryptImage(url, mediaKey)
if decryptedImage:
with open("images/" + messageId + ".jpg", "wb") as f:
f.write(bytearray(decryptedImage))
f.close()

def status(self, callback=None):
if self.activeWs is not None:
messageTag = str(getTimestamp())
Expand Down