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From: Stefan Claas <fgrsna.pynnf@vagrearg.eh>
Newsgroups: sci.crypt
Subject: Re: XChaCha20 Python3 CLI tool
Date: Tue, 14 Jan 2025 15:12:51 +0100
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Stefan Claas wrote:
> Phil Carmody wrote:
> > Stefan Claas <pollux@tilde.club> writes:
> > > Hi all,
> > > 
> > > DJB's XChaCha20 stream cipher is pretty cool for Text messages (SMS),
> > > if you have also a proper encoder for the binary output.
> > > 
> > > So I decided to convert my Go Code to Python3.
> > > 
> > > Here is the program to play with, base64 encoded.
> > > 
> > > $ ./xchacha20.py
> > > Error: Incorrect number of arguments
> > > Usage: ./xchacha20.py <keyfile> <noncefile> < infile > outfile
> > > 
> > > XChaCha20 encryption/decryption tool
> > > 
> > > Arguments:
> > >   keyfile    Path to the file containing the key in hexadecimal format
> > >   noncefile  Path to the file containing the nonce in hexadecimal format
> > 
> > Why is the nonce in a file - are you planning on using it multiple
> > times?
> 
> I always use nonces from files and for each message a new one. I have
> my nonce rachtet program 'nora' which calculates them, without needing
> to transfer them.
> 
> https://github.com/706f6c6c7578/nora

xchacha20.go is updated, so that you can input the password and nonce
in the shell, with -p and -s parameter. I did this because now I have
also pwgen.go which uses the TPM 2.0 hardware TRNG.

This is pretty cool IMHO, becaue you generate the password for xchacha20.go
with pwgen.go, put it with Yubikey Authenticator on Slot 2 of your Yubikey
and friends Yubikeys and no longer need to type it in, because you simply
press the button. :-)

https://github.com/706f6c6c7578/xchacha20
https://github.com/706f6c6c7578/pwgen
https://www.yubico.com/products/yubico-authenticator/

-- 
Regards
Stefan