The Rijndael specification details the design choices for the s-box in section 7.2. They describe the choice of affine mapping as follows: We have chosen an affine mapping that has a very simple ...
I have written the routines Rijndael 128-Bit ENC/DEC and KeyExpand. In bit sliced SSE2, and from his OPS would like to know its performance. The results are as follows: ENC: SubBytes&Shiftrows ...