The substitution tables (S-boxes) s_box and inv_s_box are used by the expanded key schedule function key_expansion and the en- and decrypting functions cipher and inv_cipher to directly substitute a byte (element of GF(28)) by another byte of the same finite field. In any speed optimized real-world application the substitution tables would definitely be hard coded a priori in a constant but in the scope of this educational paper it seems to be interesting, how the S-boxes can be generated.

aes_sbox.v

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