Can anyone tell me how much rom and ram is needed for AES on a STM32F7 with hardware acceleration and with just the firmware?

[Tesla DeLorean]

This would be something simplistic you could build/quantify

STM32Cube_FW_F7_V1.16.0\Projects\STM32F769I_EVAL\Examples\CRYP\CRYP_AESGCM

[Piranha]

At least for the software implementation, you can estimate sizes for a BearSSL library:

https://bearssl.org/sizes.html