oxo @oxo@qoto.org

On a mobile phone entering the search term 'duckduckgo' in the search engine Startpage (on their website) gives me no result to the ddg website. At least not on the first page. The only offers I get are sources to install the app.
What should I say about that?
Well; surprisingly annoying.

After many years I started to build a website again, when I discovered #codeberg pages.

Last time it was pure HTML I guess and maybe I used Dreamweaver?
This time I use the #hugo framework as open source static site generator. Really a nice experience to build and see it online in a matter of seconds!
Have no clue though how there can be a secure connection though? Without having touched any TLS stuff.

Anyhow, for those who want to follow my babysteps: https://oxo.codeberg.page

Linus Torvalds activity chart looks like a heart rate monitor.

#linux #public #repo
https://github.com/torvalds

https://fightchatcontrol.eu/#contact-tool

Recently I made some neat date / time helper functions for bash / zsh.

I.e.: 'dten' gives current decimal date and timevalues with an added nanosecond epoch
(20250826_171150_1756221110.129674445)

Or: 'dtw' returns the current date-time with an added abbreviated weekday
(20250825_100736_W12_su)

Can be helpful for those living inside the shell!

#linux #bash #zsh #shell #script #date #time #epoch #nano

https://codeberg.org/oxo/dotf/src/branch/main/zsh/function/date-time.sh

Kommande: Grundläggande Linux kurs
https://www.abf.se/blekinge/kurs/grundlaggande-linux-3870538/
#abf #sweden #linux #course

Making steps into the right direction with my Rijndael cipher script. Almost done now with the key expansion and the so called g-function. Last step is implementation of the round constants.
When that is done I 'only' have to put all the stuff in a proper loop. If that works I will be happy, but the journey will not end there. A lot of testing and see how to decrypt...
😃

#linux #bash #shell #script #aes #rijndael #encryption

https://codeberg.org/oxo/tool/src/branch/main/dev/aes

Finally found my way through the Galois Fields.
The mix-colums part of the Rijndael key scheduler is done now.
Next up: generating round keys.

#linux #bash #shell #script #aes #rijndael #encryption

https://codeberg.org/oxo/tool/src/branch/main/dev/aes

In my 'baes' :) project I am struggling with Galois Fields and get field-exceeding values properly calculated.

I am home now and suddenly it struck me that probably the solution can be (note-to-self):

After multiplication with the irreducible polynomial, use a mask and a bitwise AND to keep only the lower 7 bits of the final result value.

I.e.:
value=0xA3F
mask=0x7F
result=$(( value & mask ))
So then the result will become: 0b00111111

Hopefully this will work...

#linux #bash #shell #script #aes #rijndael #encryption

https://codeberg.org/oxo/tool/src/branch/main/dev/aes

Shift rows in the pocket!
#linux #bash #shell #script #aes #rijndael #encryption

https://codeberg.org/oxo/tool/src/branch/main/dev/aes

The substitution box, one of the steps in key scheduling for the Rijndael cipher, is working.

The table is in hexadecimal, therefore some sub-optimal conversion is going on. But it works for now.

Still far away from fully working, but I am still making good progress each time I work on this project.

Next up: bitwise row and column shifting.

https://codeberg.org/oxo/tool/src/branch/main/dev/aes

#linux #bash #shell #script #aes #rijndael #encryption

Steadily on my way builing an Rijndael-esque encryptor.
Building upon my #xor shell script; yesterday I made an 256 bits sustitution table.
Today I made the foundation of a key scheduler. Interestingly bash is able to process 4×4, 6×4 or 8×4 matrices. And the code is still quite simple. I am learning a lot and enjoying all the little puzzles to solve!
Follow my progress on #codeberg.
https://codeberg.org/oxo/tool/src/branch/main/dev/aes
#linux #bash #shell #script #aes #rijndael #encryption

Duck.ai is not able to generate a complete substitution matrix from the Rijndael cipher. It starts off promising, but then gets stuck about halfway. I asked it to generate the table from the halfway point and it did. But it made up the values it produced. #stupidai

Cut the #base64 endoding from my #xor shall script. Also adjusted to a non-redundant key length for the last chunk of input into the xor function.
Next hurdle: proper key rotation...
Will upload my progress to the repos asap.
#linix #bash #xor #enccryption