https://github.com/msantos/totp.c
simple, standalone TOTP without dependencies
https://github.com/msantos/totp.c
capsicum pledge seccomp setrlimit totp
Last synced: 2 months 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 (about 6 years ago)
- Default Branch: master
- Last Pushed: 2025-02-21T14:38:01.000Z (4 months ago)
- Last Synced: 2025-03-30T11:41:36.257Z (3 months ago)
- Topics: capsicum, pledge, seccomp, setrlimit, totp
- Language: C
- Homepage:
- Size: 43 KB
- Stars: 8
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
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 process restrictions
make
# use the seccomp process restrictions
RESTRICT_PROCESS=seccomp make clean all
# disable the process restrictions
RESTRICT_PROCESS=null make clean all
#### using musl
## sudo apt install musl-dev musl-tools
RESTRICT_PROCESS=rlimit ./musl-make
## linux seccomp process restrictions: requires kernel headers
export MUSL_INCLUDE=/tmp
git clone https://github.com/sabotage-linux/kernel-headers.git $MUSL_INCLUDE/kernel-headers
./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.