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How the cipher key is scheduled if it is less than 128 bit (for AES 128), or less than 192 bit (for AES 192) or less than 256 (for AES 256)? That is undefined; the AES specification does not address that possibility. The AES 128 algorithm assumes that you give it 128 bits of key (and tells you exactly what to do with that key); it says nothing about ...


To do EEA on a finite-field, you can't perform the operations using the operations in the ring of the integers (and they're not precisely the same operations in the field either, as you're working with bit vectors, not field elements). In particular: When you do "addition", you need to perform the addition as done in even characteristic fields (that is, ...

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