Google Authenticator

google_authenticator.py

# https://stackoverflow.com/questions/8529265/google-authenticator-implementation-in-python/8549884#8549884

import hmac, base64, struct, hashlib, time


def get_hotp_token(secret, intervals_no):
    key = base64.b32decode(secret, True)
    msg = struct.pack(">Q", intervals_no)
    h = hmac.new(key, msg, hashlib.sha1).digest()
    o = ord(h[19]) & 15 # without ord in python3
    h = (struct.unpack(">I", h[o:o+4])[0] & 0x7fffffff) % 1000000
    return h


def get_totp_token(secret):
    return get_hotp_token(secret, intervals_no=int(time.time())//30)

qrcode_generator.py

# http://blog.matael.org/writing/python-and-qrcodes/
# https://github.com/google/google-authenticator/wiki/Key-Uri-Format
# pip install pillow qrcode

import qrcode
img = qrcode.make('otpauth://totp/[email protected]?secret=testtesttesttest&issuer=test')
img.save('filename.png')

# django

def secureImage(request,imagePath):
    response = HttpResponse(mimetype="image/png")
    img = qrcode.make('otpauth://totp/[email protected]?secret=testtesttesttest&issuer=test')
    img.save(response, 'png')
    return response