https://github.com/msantos/totp.c

simple, standalone TOTP without dependencies
https://github.com/msantos/totp.c

capsicum pledge seccomp setrlimit totp

Last synced: 16 days ago
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simple, standalone TOTP without dependencies

• Host: GitHub
• URL: https://github.com/msantos/totp.c
• Owner: msantos
• License: bsd-3-clause
• Created: 2019-04-26T13:59:46.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2023-12-08T12:18:41.000Z (12 months ago)
• Last Synced: 2023-12-08T13:28:14.114Z (12 months ago)
• Topics: capsicum, pledge, seccomp, setrlimit, totp
• Language: C
• Homepage:
• Size: 40 KB
• Stars: 7
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
totp.c: simple, standalone TOTP

===============================

totp.c is a small, simple, standalone command line TOTP

([RFC6238](https://tools.ietf.org/html/rfc6238)) without any external

dependencies.

`totp.c` was written by

[David M. Syzdek](https://gist.github.com/syzdek/eba233ca33e1b5a45a99).

The standalone `hmac_sha1` implementation is by

[Bob Liu](https://github.com/Akagi201/hmac-sha1).

Building

--------

    # use the default rlimit sandbox

    make

    # use the seccomp sandbox

    RESTRICT_PROCESS=seccomp make clean all

    # disable the sandbox

    RESTRICT_PROCESS=null make clean all

    #### using musl

    RESTRICT_PROCESS=rlimit ./musl-make

    ## linux seccomp sandbox: requires kernel headers

    # clone the kernel headers somewhere

    cd /path/to/dir

    git clone https://github.com/sabotage-linux/kernel-headers.git

    # then compile

    MUSL_INCLUDE=/path/to/dir ./musl-make clean all

Usage

-----

    Usage: totp  [  [  ] ]

    totp YW2N4W7UBAIAEVCT 

    # 30 second intervals (default)

    totp YW2N4W7UBAIAEVCT 30

    # previous window

    totp YW2N4W7UBAIAEVCT 30 -30

    # next window

    totp YW2N4W7UBAIAEVCT 30 30

    # read key from stdin

    echo YW2N4W7UBAIAEVCT | totp - 30

Why?

----

I needed a simple TOTP application that could be statically linked for

use on an old powerpc linux device.