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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.

codeberg.org/oxo/tool/src/bran

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