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Do I have to do all the "zero" stuff and doubling and XORing? If you are implementing the S2V primitive, using an AES-CMAC function, then yes, you will need to do all that "zero" stuff and doubling and XORing. Yes, if you peek inside the AES-CMAC function, you will find some logic that looks sort of like this; processing an all zero block, doubling the ...

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