the first task of the ”main” program aes_demo is a call to aes_init in Line 1. This initialization routine supplies 1 the actual en- and decryption functions (cipher and inv_cipher) with the expanded key schedule w, the substitution tables s_box and inv_s_box, and the polynomial matrices poly_mat and inv_poly_mat. These quantities have to be generated only once and can be used by any subsequent en- or decipher call.

aes_cipher_top.v

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