Aes 128 dynamic sbox implementation using vhdl

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nihi

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Hello

I am designing Dynamic SBOX for AES. I have designed it for encryption as- normal AES Sbox xor Roundkey (127 down to 120) but for decryption I need inverse of that so, I am not getting how to inverse a 16*16 matrix.

Because if I do it directly then i'l get Inv Sbox xor roundkey(127 down to 120) but I need Inv(AES sbox xor roundkey (127 down to 120) ).

please help me.
Thank you.
 

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