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ROR/BYTE_ROR_n calls in mixcolumns_n

1

Hi @aadomn, Recalling [this observation](https://github.com/RustCrypto/block-ciphers/pull/184) and [your paper](https://eprint.iacr.org/2020/1123.pdf), specifically Figure 6 and the following paragraph on page 8. The paper gives a count of _27 XOR, 32 AND and 16...

peterdettman