The key expansion function takes the user supplied 16 bytes long key and utilizes the previously created round constant matrix rcon and the substitution table s_box to generate a 176 byte long key schedule w, which will be used during the en- and decryption processes. The blue arrowed closed loop indicates that the functions rot_word and sub_bytes are called iteratively by the key expansion function.

aes_key_expand_128.v

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