def encryptImg(self,img, refkey, mimetype):
print(mimetype)
if(mimetype == "audio/wav"):
derivative = HKDFv3().deriveSecrets(binascii.unhexlify(refkey),
"WhatsApp Audio Keys", 112)
else:
derivative = HKDFv3().deriveSecrets(binascii.unhexlify(refkey),
"WhatsApp Image Keys".encode(), 112)
parts = ByteUtil.split(derivative, 16, 32)
iv = parts[0]
cipherKey = parts[1]
macKey=derivative[48:80]
mac = hmac.new(macKey,digestmod=hashlib.sha256)
mac.update(iv)
cipher = AES.new(key=cipherKey, mode=AES.MODE_CBC, IV=iv)
imgEnc = cipher.encrypt(self.pad(img))
mac.update(imgEnc)
hash = mac.digest()
hashKey = ByteUtil.trim(mac.digest(), 10)
finalEnc = imgEnc + hashKey
return finalEnc
def encryptImg(self, img, refkey):
derivative = HKDFv3().deriveSecrets(binascii.unhexlify(refkey),
binascii.unhexlify(WHATSAPP_KEY),
112)
parts = ByteUtil.split(derivative, 16, 32)
iv = parts[0]
cipherKey = parts[1]
macKey = derivative[48:80]
mac = hmac.new(macKey, digestmod=hashlib.sha256)
mac.update(iv)
cipher = AES.new(key=cipherKey, mode=AES.MODE_CBC, IV=iv)
imgEnc = cipher.encrypt(self.pad(img))
mac.update(imgEnc)
hash = mac.digest()
hashKey = ByteUtil.trim(mac.digest(), 10)
finalEnc = imgEnc + hashKey
return finalEnc