For MARS, if a separate key schedule pipeline stage
is used, that pipeline stage must have its own Sbox. Since each S-box requires a large (16 Kbit)
ROM, this change is a non-trivial addition to the
logic cost of MARS, which has already been shown
to be by far the largest among the AES finalists
[WBRF00, IKM00]. Also, the time required for precomputing the MARS subkeys is fairly large.
 
For MARS, if a separate key schedule pipeline stageis used, that pipeline stage must have its own Sbox. Since each S-box requires a large (16 Kbit)ROM, this change is a non-trivial addition to thelogic cost of MARS, which has already been shownto be by far the largest among the AES finalists[WBRF00, IKM00]. Also, the time required for precomputing the MARS subkeys is fairly large.
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