Derive current OTP-auth tokens from secret (e.g. as in Google Authenticator)

otp.py

"""
Prerequisites (install using easy_install or pip):
    otpauth argparse

Sample token: https://www.google.com/chart?chs=200x200&chld=M|0&cht=qr&chl=otpauth://totp/user@host%3Fsecret%3DAAAAAAAAAAAAAAAA    
Usage: python otp.py --secret AAAAAAAAAAAAAAAA
"""
import argparse, time
from otpauth import generate_totp
from base64 import b32decode

if __name__ == '__main__':
  parser = argparse.ArgumentParser(description='OTP (e.g. Google Authenticator)')
  parser.add_argument('-s', '--secret', required=True)
  args = parser.parse_args()
  print generate_totp(b32decode(args.secret))