Function aes::soft::fixslice::xor_columns

fn xor_columns(rkeys: &mut [u64], offset: usize, idx_xor: usize, idx_ror: u32)

XOR the columns after the S-box during the key schedule round function.

The idx_xor parameter refers to the index of the previous round key that is involved in the XOR computation (should be 8 and 16 for AES-128 and AES-256, respectively).

The idx_ror parameter refers to the rotation value, which varies between the different key schedules.