I am not sure about different keys. The AES key usage is always the same for encrypting individual blocks. AES is nothing but about encrypting a single 16-byt

I am not sure about different keys. The AES key usage is always the same for encrypting individual blocks. AES is nothing but about encrypting a single 16-byte block of data. The cipher block modes build on top of AES to span encryption over multiple blocks. Some cipher modes can take in additional parameters to customize its usage. E.g. CCM can take in 64-bit to 128-bit authentication codes.