This module generates one-time passcodes that are based either on a counter or time using a secret key that is assumed known by server and client.
The counter-based passcodes are hash-based one-time passcodes (HOTP) and are defined in RFC 4226. The time-based passcodes are time-based one-time passcodes (TOTP) and are defined in RFC 6238. For HOTP, the pseudorandom function used is HMAC-SHA-1 and the associated counter should be incremented after each passcode generation. TOTP is HOTP with a specified time interval for validity. A common time interval is 30 seconds.
pip install che_guevara_otp
To set up a launcher for the che_guevara_otp command, copy Che.svg to /usr/share/icons/hicolor/scalable/apps/ and copy che_guevara_otp.desktop to /usr/share/applications/, for example:
sudo cp /usr/local/lib/python3.5/dist-packages/che_guevara_otp-2018.5.11.1653-py3.5.egg/che_guevara_otp/data/Che.svg /usr/share/icons/hicolor/scalable/apps/ sudo cp /usr/local/lib/python3.5/dist-packages/che_guevara_otp-2018.5.11.1653-py3.5.egg/che_guevara_otp/data/che_guevara_otp.desktop /usr/share/applications/
HOTP passcodes can be generated in a way like the following:
>>> import che_guevara_otp >>> secret = "XXXXXXXXXXXXXXXX" >>> for nonce in range(0, 3): ... print(che_guevara_otp.HOTP(secret = secret, nonce = nonce)) ... 561452 686073 840123
TOTP passcodes can be generated in a way like the following, where the default time interval is 30 seconds:
>>> import che_guevara_otp >>> secret = "XXXXXXXXXXXXXXXX" >>> print(che_guevara_otp.TOTP(secret = secret)) 826402
che_guevara_otp terminal loop display
The command che_guevara_otp displays time-based one-time passcodes at 30 second intervals based on secrets stored in a specified file ~/.secrets. The file is unencrypted plaintext so userspace encryption combined with other security is assumed. The contents of the secrets file should be of the following form:
OmegaBay: XXXXXXXXXXXXXXXXXXXXXXXX Missile Emporium: YYYYYYYYYYYYYYYYYYYYYYYY
Under consideration are functions to install the launcher and icon infrastructure based on Python version information.