POT is an Erlang library for generating one time passwords. It supports both HMAC-based one time passwords (HOTP) and time based ones (TOTP). The generated passwords are compatible with Google Authenticator.
POT is an almost direct translation of the Python OneTimePass library.
POT should work with any recent version of Erlang/OTP, Elixir and other Erlang VM based languages.
In order to learn more about one time password generation, see the following Wikipedia articles:
- Documentation.
-
Released version 0.10.1 with the following change:
- Added pot prefix to base32 module avoid name collision (Thanks to Girish Ramnani). This is a breaking change,
base32
module was renamed topot_base32
.
- Added pot prefix to base32 module avoid name collision (Thanks to Girish Ramnani). This is a breaking change,
-
Released version 0.9.8 with the following bug fix:
- Return boolean on pot:valid_hotp/2 and pot:valid_hotp/3 (Thanks to Zbigniew Pekala)
pot:totp/2
supports setting the timestamp (Thanks to Julius Beckmann)
- Added options to support Android devices (Thanks to Pedro Vieira)
- Released version 0.9.5 with bug fixes (Thanks to Peter McLain)
- Embedded base32_erlang library
- Initial version
We recommend using rebar3 for managing dependencies and building the library. POT is available on hex.pm, so you can just include the following in your rebar.config
:
{deps, [pot]}.
POT works with binary tokens and secrets.
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = pot:totp(Secret),
% Do something with the token
Secret = <<"MFRGGZDFMZTWQ2LK">>,
CurrentTrial = 3,
Token = pot:hotp(Secret, CurrentTrial),
% Do something with the token
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = <<"123456">>,
IsValid = pot:valid_totp(Token, Secret),
% Do something
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = <<"123456">>,
LastUsed = 5, % last successful trial
IsValid = pot:valid_hotp(Token, Secret, [{last, LastUsed}]),
% Do something
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = pot:totp(Secret, [{addWindow, 1}]),
% Do something
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = <<"123456">>,
IsValid = pot:valid_totp(Token, Secret, [{window, 1}, {addWindow, 1}]),
% Do something
Time format is {MegaSecs, Secs, MicroSecs}
received by os:timestamp()
Secret = <<"MFRGGZDFMZTWQ2LK">>,
Token = pot:totp(Secret, [{timestamp, {1518, 179058, 919315}}]),
% Token will be <<"151469">>
Include POT in your mix.exs
as a dependency:
defp deps do
[{:pot, "~>0.10.1"}]
end
secret = "MFRGGZDFMZTWQ2LK"
token = :pot.totp(secret)
# Do something with the token
secret = "MFRGGZDFMZTWQ2LK"
current_trial = 3
token = :pot.hotp(secret, current_trial)
# Do something with the token
secret = "MFRGGZDFMZTWQ2LK"
token = "123456"
is_valid = :pot.valid_totp(token, secret)
# Do something
secret = "MFRGGZDFMZTWQ2LK"
token = "123456"
last_used = 5 # last successful trial
is_valid = :pot.valid_hotp(token, secret, [{:last, last_used}])
# Do something
secret = "MFRGGZDFMZTWQ2LK"
token = :pot.totp(secret, [addwindow: 1])
# Do something
secret = "MFRGGZDFMZTWQ2LK"
token = "123456"
is_valid = :pot.valid_totp(token, secret, [window: 1, addwindow: 1])
# Do something
Time format is {MegaSecs, Secs, MicroSecs}
received by :os.timestamp()
secret = "MFRGGZDFMZTWQ2LK"
token = :pot.totp(secret, [timestamp: {1518, 179058, 919315}])
# Token will be <<"151469">>
- Yuce Tekol
- Tomasz Jaskowski: OneTimePass Python library
- Andrew Tunnell-Jones: base32_erlang library
Thanks to contributors.
Copyright (c) 2014-2019 Yüce Tekol
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